import math
import sys
import errno
import os
import ctypes
import faulthandler
import gc
import time
import signal
import unittest
import itertools
import warnings
import tempfile
import functools
import operator
import torch
import torch_npu
import torch_npu.testing
import torch.utils.data.datapipes as dp
from torch import multiprocessing as mp
from torch.utils.data import (
ChainDataset,
ConcatDataset,
DataLoader,
Dataset,
IterableDataset,
IterDataPipe,
Subset,
TensorDataset,
StackDataset,
_utils
)
from torch.utils.data._utils import MP_STATUS_CHECK_INTERVAL
from torch.utils.data.dataset import random_split
from torch.utils.data.datapipes.iter import IterableWrapper
from torch._utils import ExceptionWrapper
from torch.testing._internal.common_utils import (TestCase, run_tests, TEST_NUMPY, IS_WINDOWS, IS_JETSON,
IS_CI, NO_MULTIPROCESSING_SPAWN, skipIfRocm, slowTest,
load_tests, TEST_WITH_ASAN, TEST_WITH_TSAN, IS_SANDCASTLE,
IS_MACOS, parametrize)
from torch.testing._internal.common_device_type import instantiate_device_type_tests
try:
import psutil
HAS_PSUTIL = True
except ImportError:
HAS_PSUTIL = False
err_msg = ("psutil not found. Some critical data loader tests relying on it "
"(e.g., TestDataLoader.test_proper_exit) will not run.")
if IS_CI:
raise ImportError(err_msg) from None
else:
warnings.warn(err_msg)
try:
import dill
dill.extend(use_dill=False)
HAS_DILL = True
except ImportError:
HAS_DILL = False
skipIfNoDill = unittest.skipIf(not HAS_DILL, "no dill")
try:
import numpy as np
HAS_NUMPY = True
except ImportError:
HAS_NUMPY = False
skipIfNoNumpy = unittest.skipIf(not HAS_NUMPY, "no NumPy")
load_tests = load_tests
TEST_NPU = torch.npu.is_available()
if not NO_MULTIPROCESSING_SPAWN:
mp = mp.get_context(method='spawn')
JOIN_TIMEOUT = 60.0
supported_multiprocessing_contexts = [None] + list(torch.multiprocessing.get_all_start_methods())
def _clone_collate(b):
return [x.clone() for x in b]
@unittest.skipIf(
TEST_WITH_TSAN,
"Fails with TSAN with the following error: starting new threads after multi-threaded "
"fork is not supported. Dying (set die_after_fork=0 to override)")
class TestDatasetRandomSplit(TestCase):
def test_lengths_must_equal_dataset_size(self):
with self.assertRaises(ValueError):
random_split([1, 2, 3, 4], [1, 2])
def test_splits_have_correct_size(self):
splits = random_split([1, 2, 3, 4, 5, 6], [2, 4])
self.assertEqual(len(splits), 2)
self.assertEqual(len(splits[0]), 2)
self.assertEqual(len(splits[1]), 4)
splits = random_split([1, 2, 3, 4, 5, 6], [0.5, 0.5])
self.assertEqual(len(splits), 2)
self.assertEqual(len(splits[0]), 3)
self.assertEqual(len(splits[1]), 3)
self.assertEqual(
len(random_split(range(3), [0.5, 0.5], generator=torch.Generator().manual_seed(1))),
2
)
splits = random_split(range(106), [0.1, 0.2, 0.3, 0.4],
generator=torch.Generator().manual_seed(1))
self.assertEqual(len(splits[0]), 11)
self.assertEqual(len(splits[1]), 22)
self.assertEqual(len(splits[2]), 31)
self.assertEqual(len(splits[3]), 42)
def test_splits_are_mutually_exclusive(self):
data = [5, 2, 3, 4, 1, 6]
splits = random_split(data, [2, 4])
all_values = []
all_values.extend(list(splits[0]))
all_values.extend(list(splits[1]))
data.sort()
all_values.sort()
self.assertListEqual(data, all_values)
splits = random_split(data, [0.33, 0.67])
all_values = []
all_values.extend(list(splits[0]))
all_values.extend(list(splits[1]))
data.sort()
all_values.sort()
self.assertListEqual(data, all_values)
data = [1, 2, 3, 4]
splits = random_split(data, [0.25, 0.75])
all_values = []
all_values.extend(list(splits[0]))
all_values.extend(list(splits[1]))
data.sort()
all_values.sort()
self.assertListEqual(data, all_values)
def test_splits_indexing_type(self):
r"""Indices generated by random_split
should be of integer type
"""
class CustomDataset:
def __init__(self, test_object, custom_list):
self.data = custom_list
self.test_object = test_object
def __getitem__(self, key):
self.test_object.assertEqual(type(key), int)
return self.data[key]
def __len__(self):
return len(self.data)
x = [1, 2, 3, 4, 5]
dataset = CustomDataset(self, x)
dataset = random_split(dataset, [5])[0]
data_loader = DataLoader(dataset)
for batch in data_loader:
pass
dataset = CustomDataset(self, x)
dataset = random_split(dataset, [1.0])[0]
data_loader = DataLoader(dataset)
for batch in data_loader:
pass
def test_splits_reproducibility(self):
self.assertEqual(
[list(x) for x in random_split(range(10), [3, 7], generator=torch.Generator().manual_seed(1))],
[[5, 6, 1], [2, 0, 8, 9, 3, 7, 4]],
)
self.assertEqual(
random_split(range(100), [60, 40], generator=torch.Generator().manual_seed(42)),
random_split(range(100), [60, 40], generator=torch.Generator().manual_seed(42)),
)
self.assertEqual(
random_split(range(100), [0.5, 0.5], generator=torch.Generator().manual_seed(42)),
random_split(range(100), [0.5, 0.5], generator=torch.Generator().manual_seed(42)),
)
self.assertEqual(
random_split(range(100), [0.33, 0.33, 0.34], generator=torch.Generator().manual_seed(42)),
random_split(range(100), [0.33, 0.33, 0.34], generator=torch.Generator().manual_seed(42)),
)
def test_incomplete_fractional_splits(self):
with self.assertRaises(ValueError):
random_split([1, 2, 3, 4], [0.1])
with self.assertRaises(ValueError):
random_split([1, 2, 3, 4], [1.1])
def test_splits_generator(self):
state = torch.get_rng_state()
a = torch.rand(10)
torch.set_rng_state(state)
random_split(range(10), [5, 5])
b = torch.rand(10)
self.assertNotEqual(a, b)
state = torch.get_rng_state()
a = torch.rand(10)
torch.set_rng_state(state)
random_split(range(10), [5, 5], generator=torch.Generator().manual_seed(42))
b = torch.rand(10)
self.assertEqual(a, b)
def test_slicing_of_subset_of_dataset(self):
dataset = TensorDataset(torch.tensor([1, 2, 3, 4, 5]))
subset_of_dataset = Subset(dataset, [0, 1, 2, 3, 4])
self.assertEqual(subset_of_dataset[:], dataset[:])
self.assertEqual(subset_of_dataset[1:2], dataset[1:2])
self.assertEqual(subset_of_dataset[0:-1:2], dataset[0:-1:2])
subset1, subset2 = random_split(dataset, [3, 2])
self.assertEqual(subset1[:], dataset[subset1.indices[:]])
self.assertEqual(subset1[0:2], dataset[subset1.indices[0:2]])
self.assertEqual(subset1[0:-1:2], dataset[subset1.indices[0:-1:2]])
def test_slicing_of_subset_of_subset(self):
dataset = TensorDataset(torch.tensor([1, 2, 3, 4, 5]))
subset_of_dataset = Subset(dataset, [0, 1, 2, 3, 4])
subset_of_subset = Subset(subset_of_dataset, [0, 1, 2, 3, 4])
self.assertEqual(subset_of_subset[:], dataset[:])
self.assertEqual(subset_of_subset[0:2], dataset[0:2])
self.assertEqual(subset_of_subset[0:-1:2], dataset[0:-1:2])
subset1, subset2 = random_split(dataset, [4, 1])
subset_of_subset1, subset_of_subset2 = random_split(subset1, [3, 1])
idx = [subset1.indices[i] for i in subset_of_subset1.indices]
self.assertEqual(subset_of_subset1[:], dataset[idx.copy()])
self.assertEqual(subset_of_subset1[0:2], dataset[idx[0:2]])
self.assertEqual(subset_of_subset1[0:-1:2], dataset[idx[0:-1:2]])
class NPUCountingDataset(Dataset):
def __init__(self, n):
super().__init__()
self.n = n
def __getitem__(self, i):
return torch.as_tensor(i, device='npu')
def __len__(self):
return self.n
class CountingDataset(Dataset):
def __init__(self, n):
super().__init__()
self.n = n
def __getitem__(self, i):
return i
def __len__(self):
return self.n
class CountingIterableDataset(IterableDataset):
def __init__(self, n):
super().__init__()
self.n = n
def __iter__(self):
return iter(range(self.n))
def __len__(self):
return self.n
@unittest.skipIf(
TEST_WITH_TSAN,
"Fails with TSAN with the following error: starting new threads after multi-threaded "
"fork is not supported. Dying (set die_after_fork=0 to override)")
class TestTensorDataset(TestCase):
def test_len(self):
source = TensorDataset(torch.randn(15, 10, 2, 3, 4, 5), torch.randperm(15))
self.assertEqual(len(source), 15)
def test_getitem(self):
t = torch.randn(15, 10, 2, 3, 4, 5)
d = torch.randn(15, 10)
source = TensorDataset(t, d)
for i in range(15):
self.assertEqual(t[i], source[i][0])
self.assertEqual(d[i], source[i][1])
def test_getitem_1d(self):
t = torch.randn(15)
d = torch.randn(15)
source = TensorDataset(t, d)
for i in range(15):
self.assertEqual(t[i], source[i][0])
self.assertEqual(d[i], source[i][1])
def test_single_tensor(self):
t = torch.randn(5, 10)
source = TensorDataset(t)
self.assertEqual(len(source), 5)
for i in range(5):
self.assertEqual(t[i], source[i][0])
def test_many_tensors(self):
t0 = torch.randn(5, 10, 2, 3, 4, 5)
t1 = torch.randn(5, 10)
t2 = torch.randn(5, 10, 2, 5)
t3 = torch.randn(5, 10, 3, 7)
source = TensorDataset(t0, t1, t2, t3)
self.assertEqual(len(source), 5)
for i in range(5):
self.assertEqual(t0[i], source[i][0])
self.assertEqual(t1[i], source[i][1])
self.assertEqual(t2[i], source[i][2])
self.assertEqual(t3[i], source[i][3])
@unittest.skipIf(
TEST_WITH_TSAN,
"Fails with TSAN with the following error: starting new threads after multi-threaded "
"fork is not supported. Dying (set die_after_fork=0 to override)")
class TestStackDataset(TestCase):
def test_empty(self):
with self.assertRaisesRegex(ValueError, "At least one dataset should be passed"):
StackDataset()
def test_mixed(self):
with self.assertRaisesRegex(ValueError, "Supported either"):
StackDataset(TensorDataset(torch.randn(15, 10)), a=TensorDataset(torch.randn(10, 15)))
def test_size_mismatch(self):
with self.assertRaisesRegex(ValueError, "Size mismatch between datasets"):
StackDataset(TensorDataset(torch.randn(15, 10)), TensorDataset(torch.randn(10, 15)))
with self.assertRaisesRegex(ValueError, "Size mismatch between datasets"):
StackDataset(a=TensorDataset(torch.randn(15, 10)), b=TensorDataset(torch.randn(10, 15)))
def test_len(self):
source = StackDataset(TensorDataset(torch.randn(15, 10)), TensorDataset(torch.randn(15)))
self.assertEqual(len(source), 15)
source = StackDataset(TensorDataset(torch.randn(15, 10)))
self.assertEqual(len(source), 15)
source = StackDataset(a=TensorDataset(torch.randn(15, 10)), b=TensorDataset(torch.randn(15)))
self.assertEqual(len(source), 15)
source = StackDataset(a=TensorDataset(torch.randn(15, 10)))
self.assertEqual(len(source), 15)
def test_single(self):
t = TensorDataset(torch.randn(15, 10))
source = StackDataset(t)
for i in range(15):
self.assertEqual(t[i], source[i][0])
source = StackDataset(a=t)
for i in range(15):
self.assertEqual(t[i], source[i]['a'])
def test_getitem(self):
t = TensorDataset(torch.randn(15, 10))
d = TensorDataset(torch.randn(15, 5, 4))
source = StackDataset(t, d)
for i in range(15):
self.assertEqual(t[i], source[i][0])
self.assertEqual(d[i], source[i][1])
source = StackDataset(a=t, b=d)
for i in range(15):
self.assertEqual(t[i], source[i]['a'])
self.assertEqual(d[i], source[i]['b'])
def test_getitems(self):
class GetItemsDataset(Dataset):
def __init__(self):
self.data = torch.randn(4)
def __getitem__(self, item):
return self.data[item]
def __getitems__(self, items):
return self.data[items]
def __len__(self):
return 4
t = GetItemsDataset()
ls = [1, 2, 3, 4]
source = StackDataset(t, ls)
batch = source.__getitems__([0, 1, 2, 3])
for i in range(4):
self.assertEqual(t[i], batch[i][0])
self.assertEqual(ls[i], batch[i][1])
source = StackDataset(t=t, l=ls)
batch = source.__getitems__([0, 1, 2, 3])
for i in range(4):
self.assertEqual(t[i], batch[i]['t'])
self.assertEqual(ls[i], batch[i]['l'])
def test_getitems_raises_index_error(self):
class GetItemsDataset(Dataset):
def __init__(self):
self.data = torch.randn(4)
def __getitem__(self, item):
return self.data[item]
def __getitems__(self, items):
return self.data[items]
def __len__(self):
return 4
t = GetItemsDataset()
ls = [1, 2, 3, 4]
source = StackDataset(t, ls)
with self.assertRaises(IndexError):
source.__getitems__([0, 4])
def test_getitems_value_error(self):
class GetItemsDataset(Dataset):
def __init__(self):
self.data = torch.randn(4)
def __getitem__(self, item):
return self.data[item]
def __getitems__(self, items):
return self.data[items][:-1]
def __len__(self):
return 4
t = GetItemsDataset()
ls = [1, 2, 3, 4]
source = StackDataset(t, ls)
with self.assertRaisesRegex(ValueError,
"Nested dataset's output size mismatch. Expected 4, got 3"):
source.__getitems__([0, 1, 2, 3])
@unittest.skipIf(
TEST_WITH_TSAN,
"Fails with TSAN with the following error: starting new threads after multi-threaded "
"fork is not supported. Dying (set die_after_fork=0 to override)")
class TestConcatDataset(TestCase):
def test_concat_two_singletons(self):
result = ConcatDataset([[0], [1]])
self.assertEqual(2, len(result))
self.assertEqual(0, result[0])
self.assertEqual(1, result[1])
def test_concat_two_non_singletons(self):
result = ConcatDataset([[0, 1, 2, 3, 4],
[5, 6, 7, 8, 9]])
self.assertEqual(10, len(result))
self.assertEqual(0, result[0])
self.assertEqual(5, result[5])
def test_concat_two_non_singletons_with_empty(self):
result = ConcatDataset([[0, 1, 2, 3, 4],
[],
[5, 6, 7, 8, 9]])
self.assertEqual(10, len(result))
self.assertEqual(0, result[0])
self.assertEqual(5, result[5])
def test_concat_raises_index_error(self):
result = ConcatDataset([[0, 1, 2, 3, 4],
[5, 6, 7, 8, 9]])
with self.assertRaises(IndexError):
result[11]
def test_add_dataset(self):
d1 = TensorDataset(torch.rand(7, 3, 28, 28), torch.rand(7))
d2 = TensorDataset(torch.rand(7, 3, 28, 28), torch.rand(7))
d3 = TensorDataset(torch.rand(7, 3, 28, 28), torch.rand(7))
result = d1 + d2 + d3
self.assertEqual(21, len(result))
self.assertEqual(0, (d1[0][0] - result[0][0]).abs().sum())
self.assertEqual(0, (d2[0][0] - result[7][0]).abs().sum())
self.assertEqual(0, (d3[0][0] - result[14][0]).abs().sum())
def test_iterable_dataset_err(self):
d1 = TensorDataset(torch.rand(7, 3, 28, 28), torch.rand(7))
it1 = CountingIterableDataset(5)
it2 = CountingIterableDataset(10)
with self.assertRaisesRegex(AssertionError, "does not support IterableDataset"):
ConcatDataset([d1, it2, it1])
with self.assertRaisesRegex(AssertionError, "does not support IterableDataset"):
ConcatDataset([it2])
with self.assertRaisesRegex(AssertionError, "does not support IterableDataset"):
ConcatDataset([it1, d1])
def set_faulthander_if_available(_=None):
faulthandler.enable(sys.__stderr__)
if not IS_WINDOWS:
faulthandler.register(signal.SIGUSR1, file=sys.__stderr__, chain=False)
set_faulthander_if_available()
def print_traces_of_all_threads(pid):
if not IS_WINDOWS:
os.kill(pid, signal.SIGUSR1)
else:
os.kill(pid, signal.SIGSEGV)
time.sleep(5)
class ErrorTrackingProcess(mp.Process):
def __init__(self, disable_stderr=True, **kwargs):
super().__init__(**kwargs)
self._pconn, self._cconn = mp.Pipe()
self._exception = None
self.disable_stderr = disable_stderr
def run(self):
set_faulthander_if_available()
if self.disable_stderr:
with open(os.devnull, 'w') as devnull:
os.dup2(devnull.fileno(), sys.stderr.fileno())
try:
super().run()
self._cconn.send(None)
except Exception:
self._cconn.send(ExceptionWrapper(sys.exc_info()))
raise
def print_traces_of_all_threads(self):
assert self.is_alive(), "can only use print_traces_of_all_threads if the process is alive"
assert not self.disable_stderr, "do not disable stderr if you use print_traces_of_all_threads"
_ = self.exception
print_traces_of_all_threads(self.pid)
@property
def exception(self):
if self._pconn.poll():
self._exception = self._pconn.recv()
if self._exception is None:
return None
else:
return self._exception.exc_type(self._exception.exc_msg)
def send_signal(self, signum, ignore_ESRCH=False):
try:
os.kill(self.pid, signum)
except OSError as e:
if not ignore_ESRCH or e.errno != errno.ESRCH:
raise
class ErrorDataset(Dataset):
def __init__(self, size):
self.size = size
def __len__(self):
return self.size
class SegfaultDataset(Dataset):
def __init__(self, size):
self.size = size
def __getitem__(self, idx):
return ctypes.string_at(0)
def __len__(self):
return self.size
class SleepDataset(Dataset):
def __init__(self, size, sleep_sec):
self.size = size
self.sleep_sec = sleep_sec
self.sleeped = False
def __getitem__(self, idx):
if not self.sleeped:
time.sleep(self.sleep_sec)
self.sleeped = True
return idx
def __len__(self):
return self.size
class SeedDataset(Dataset):
def __init__(self, size):
self.size = size
def __getitem__(self, idx):
return torch.initial_seed()
def __len__(self):
return self.size
class WorkerSpecificIterableDataset(IterableDataset):
def __init__(self, sizes_for_all_workers):
self.sizes_for_all_workers = sizes_for_all_workers
def __iter__(self):
worker_info = torch.utils.data.get_worker_info()
assert worker_info is not None
return iter(range(self.sizes_for_all_workers[worker_info.id]))
def __len__(self):
return sum(self.sizes_for_all_workers)
class SynchronizedDataset(Dataset):
def __init__(self, size, batch_size, num_workers):
assert size >= num_workers * batch_size
self.count = mp.Value('i', 0, lock=True)
self.barrier = mp.Semaphore(0)
self.num_workers = num_workers
self.size = size
def sync_once(self):
with self.count.get_lock():
self.count.value += 1
if self.count.value == self.num_workers:
self.barrier.release()
self.barrier.acquire()
self.barrier.release()
def __getitem__(self, idx):
raise NotImplementedError
def __len__(self):
return self.size
class EmptyTensorDataset(torch.utils.data.Dataset):
def __init__(self, len_):
self.len = len_
def __len__(self):
return self.len
def __getitem__(self, any_):
return torch.empty(0)
class SynchronizedSeedDataset(SynchronizedDataset):
def __getitem__(self, idx):
self.sync_once()
return torch.initial_seed()
def _test_timeout(persistent_workers):
dataset = SleepDataset(10, 3)
dataloader = DataLoader(dataset, batch_size=2, num_workers=2, timeout=1,
persistent_workers=persistent_workers)
_ = next(iter(dataloader))
def _test_timeout_pin_memory(persistent_workers):
dataset = SleepDataset(10, 3)
dataloader = DataLoader(dataset, batch_size=2, num_workers=2, timeout=1, pin_memory=True,
persistent_workers=persistent_workers)
_ = next(iter(dataloader))
def _test_large_sampler_indices(persistent_workers):
dataloader = torch.utils.data.DataLoader(
EmptyTensorDataset(10000000),
batch_size=40960,
persistent_workers=persistent_workers,
num_workers=1)
it = iter(dataloader)
for x in it:
assert x.numel() == 0
raise RuntimeError('My Error')
def disable_stderr(worker_id):
r"""
Avoids printing "ERROR: Unexpected segmentation fault encountered in worker."
from workers. Since worker signal handler prints with low-level write(),
this has to be done on OS level via dup.
This is used as worker_init_fn for test_segfault.
"""
sys.stderr.flush()
with open(os.devnull, 'w') as devnull:
os.dup2(devnull.fileno(), sys.stderr.fileno())
def _test_segfault():
dataset = SegfaultDataset(10)
dataloader = DataLoader(dataset, batch_size=2, num_workers=2, worker_init_fn=disable_stderr)
_ = next(iter(dataloader))
def _test_no_segfault():
dataset = [1, 2, 3]
num_threads = torch.get_num_threads()
if num_threads < 4:
torch.set_num_threads(4)
else:
torch.set_num_threads(num_threads)
mp_ctx = torch.multiprocessing.get_context(method='fork')
dataloader = DataLoader(dataset, num_workers=1, worker_init_fn=disable_stderr,
multiprocessing_context=mp_ctx)
_ = next(iter(dataloader))
class TestProperExitDataset(Dataset):
def __init__(self, size, error_event):
self.size = size
self.error_event = error_event
def __len__(self):
return self.size
def __getitem__(self, idx):
worker_info = torch.utils.data.get_worker_info()
if self.error_event is not None and self.error_event.is_set() and \
worker_info.id == worker_info.num_workers - 1:
raise RuntimeError('Worker error')
return torch.tensor([idx])
class TestProperExitIterableDataset(IterableDataset):
def __init__(self, size, error_event):
self.error_event = error_event
self.size = size
self.remaining = size
def __len__(self):
return self.size
def __iter__(self):
return self
def __next__(self):
worker_info = torch.utils.data.get_worker_info()
if self.error_event is not None and self.error_event.is_set() and \
worker_info.id == worker_info.num_workers - 1:
raise RuntimeError('Worker error')
self.remaining -= 1
if self.remaining < 0:
raise StopIteration
return torch.tensor(-1000)
def _test_proper_exit(is_iterable_dataset, use_workers, pin_memory, exit_method,
hold_iter_reference, loader_setup_event, tester_setup_event,
persistent_workers):
num_workers = 2 if use_workers else 0
if exit_method == 'worker_error' or exit_method == 'worker_kill':
assert use_workers is True
if exit_method == 'worker_error':
worker_error_event = mp.Event()
else:
worker_error_event = None
if is_iterable_dataset:
ds = TestProperExitIterableDataset(7, worker_error_event)
else:
ds = TestProperExitDataset(12, worker_error_event)
loader = DataLoader(ds, batch_size=1, shuffle=False,
num_workers=num_workers, pin_memory=pin_memory,
worker_init_fn=set_faulthander_if_available,
persistent_workers=persistent_workers)
error_it = 2
if use_workers:
if is_iterable_dataset:
assert len(ds) * num_workers > (error_it + 2 + 1)
else:
assert len(loader) > (error_it + 2 + 1) * num_workers
else:
if is_iterable_dataset:
assert len(ds) > error_it + 1
else:
assert len(loader) > error_it + 1
it = iter(loader)
if use_workers:
workers = it._workers
def kill_pid(pid):
psutil_p = psutil.Process(pid)
psutil_p.kill()
psutil_p.wait(JOIN_TIMEOUT)
assert not psutil_p.is_running()
for i, _ in enumerate(it):
if i == 0:
if not hold_iter_reference:
del it
del loader
loader_setup_event.set()
tester_setup_event.wait()
if use_workers:
for w in workers:
assert w.is_alive()
if worker_error_event is not None:
worker_error_event.set()
if i == error_it:
if exit_method == 'loader_error':
raise RuntimeError('Loader error')
elif exit_method == 'loader_kill':
kill_pid(os.getpid())
elif exit_method == 'worker_kill':
kill_pid(workers[-1].pid)
if not hold_iter_reference:
gc.collect()
class TestWorkerInfoDataset(SynchronizedDataset):
def __getitem__(self, idx):
self.sync_once()
return torch.tensor(self.value)
def _test_worker_info_init_fn(worker_id):
worker_info = torch.utils.data.get_worker_info()
assert worker_id == worker_info.id, "worker_init_fn and worker_info should have consistent id"
assert worker_id < worker_info.num_workers, "worker_init_fn and worker_info should have valid id"
assert worker_info.seed == torch.initial_seed(), "worker_init_fn and worker_info should have consistent seed"
dataset = worker_info.dataset
assert isinstance(dataset, TestWorkerInfoDataset), "worker_info should have correct dataset copy"
assert not hasattr(dataset, 'value'), "worker_info should have correct dataset copy"
try:
worker_info.id = 3999
except RuntimeError as e:
assert str(e) == "Cannot assign attributes to WorkerInfo objects"
try:
worker_info.a = 3
except RuntimeError as e:
assert str(e) == "Cannot assign attributes to WorkerInfo objects"
for k in ['id', 'num_workers', 'seed', 'dataset']:
assert f"{k}=" in repr(worker_info)
dataset.value = [worker_id, os.getpid()]
def _test_get_worker_info():
assert torch.utils.data.get_worker_info() is None
num_workers = 2
batch_size = 2
dataset = TestWorkerInfoDataset(6, batch_size, num_workers)
dataloader = DataLoader(dataset, batch_size=batch_size,
num_workers=num_workers,
worker_init_fn=_test_worker_info_init_fn)
it = iter(dataloader)
data = []
for d in it:
data.append(d)
worker_pids = [w.pid for w in it._workers]
data = torch.cat(data, 0)
for d in data:
assert d[1] == worker_pids[d[0]]
assert torch.utils.data.get_worker_info() is None
assert not hasattr(dataset, 'value')
try:
_ = dataset[0]
except AttributeError:
return
raise RuntimeError('Expected AttributeError')
def init_fn(worker_id):
torch.manual_seed(12345)
class ErrorIterableDataset(IterableDataset):
def __iter__(self):
raise RuntimeError("Error in __iter__")
def error_worker_init_fn(_):
raise RuntimeError("Error in worker_init_fn")
class BulkLoadingDataset(Dataset):
def __init__(self, length):
self.length = length
def __getitem__(self, indices):
assert isinstance(indices, (list, tuple))
return torch.as_tensor(indices)
def __len__(self):
return self.length
class BulkLoadingSampler(torch.utils.data.Sampler):
def __init__(self, dataset, batch_size):
self.dataset = dataset
self.batch_size = batch_size
def __iter__(self):
for x in torch.randperm(len(self.dataset)).split(self.batch_size):
yield x.tolist()
def __len__(self):
return int(math.ceil(len(self.dataset) / float(self.batch_size)))
class TestMultiEpochDataset(IterableDataset):
def __init__(self, length):
self.length = length
def __iter__(self):
worker_info = torch.utils.data.get_worker_info()
assert worker_info is not None
worker_id = worker_info.id
for idx in range(self.length // worker_info.num_workers):
yield worker_id
def __len__(self):
return self.length
class CustomList(list):
pass
class CustomDict(dict):
pass
def row_processor(row):
import numpy as np
return np.add(row, 1)
def filter_len(row):
return len(row) == 4
@unittest.skipIf(
TEST_WITH_TSAN,
"Fails with TSAN with the following error: starting new threads after multi-threaded "
"fork is not supported. Dying (set die_after_fork=0 to override)")
@unittest.skipIf(
TEST_WITH_ASAN,
"DataLoader tests hang in ASAN, see: pytorch issue 66223")
class TestDataLoader(TestCase):
def setUp(self):
super().setUp()
self.data = torch.randn(100, 2, 3, 5)
self.labels = torch.randperm(50).repeat(2)
self.dataset = TensorDataset(self.data, self.labels)
self.persistent_workers = False
def _get_data_loader(self, dataset, **kwargs):
persistent_workers = kwargs.get('persistent_workers', self.persistent_workers)
if persistent_workers and kwargs.get('num_workers', 0) == 0:
persistent_workers = False
kwargs['persistent_workers'] = persistent_workers
return DataLoader(dataset, **kwargs)
def _test_sequential(self, loader):
batch_size = loader.batch_size
if batch_size is None:
for idx, (sample, target) in enumerate(loader):
self.assertEqual(sample, self.data[idx])
self.assertEqual(target, self.labels[idx])
self.assertEqual(idx, len(self.dataset) - 1)
else:
for i, (sample, target) in enumerate(loader):
idx = i * batch_size
self.assertEqual(sample, self.data[idx:idx + batch_size])
self.assertEqual(target, self.labels[idx:idx + batch_size])
self.assertEqual(i, math.floor((len(self.dataset) - 1) / batch_size))
def _test_shuffle(self, loader):
found_data = {i: 0 for i in range(self.data.size(0))}
found_labels = {i: 0 for i in range(self.labels.size(0))}
batch_size = loader.batch_size
if batch_size is None:
for i, (batch_samples, batch_targets) in enumerate(loader):
sample, target = (batch_samples, batch_targets)
for data_point_idx, data_point in enumerate(self.data):
if data_point.eq(sample).all():
self.assertFalse(found_data[data_point_idx])
found_data[data_point_idx] += 1
break
self.assertEqual(target, self.labels[data_point_idx])
found_labels[data_point_idx] += 1
self.assertEqual(sum(found_data.values()), (i + 1))
self.assertEqual(sum(found_labels.values()), (i + 1))
self.assertEqual(i, (len(self.dataset) - 1))
else:
for i, (batch_samples, batch_targets) in enumerate(loader):
for sample, target in zip(batch_samples, batch_targets):
for data_point_idx, data_point in enumerate(self.data):
if data_point.eq(sample).all():
self.assertFalse(found_data[data_point_idx])
found_data[data_point_idx] += 1
break
self.assertEqual(target, self.labels[data_point_idx])
found_labels[data_point_idx] += 1
self.assertEqual(sum(found_data.values()), (i + 1) * batch_size)
self.assertEqual(sum(found_labels.values()), (i + 1) * batch_size)
self.assertEqual(i, math.floor((len(self.dataset) - 1) / batch_size))
def _test_error(self, loader):
it = iter(loader)
errors = 0
while True:
try:
next(it)
except NotImplementedError:
errors += 1
except StopIteration:
self.assertEqual(errors,
math.ceil(float(len(loader.dataset)) / loader.batch_size))
return
def test_error_in_init(self):
for num_workers in [0, 2]:
loader = self._get_data_loader(ErrorIterableDataset(), num_workers=num_workers)
with self.assertRaisesRegex(RuntimeError, 'Error in __iter__'):
list(iter(loader))
loader = self._get_data_loader(self.dataset, num_workers=2, worker_init_fn=error_worker_init_fn)
with self.assertRaisesRegex(RuntimeError, 'Error in worker_init_fn'):
list(iter(loader))
def test_typing(self):
from typing import List
class SomeDatasetClass(Dataset[List[torch.Tensor]]):
pass
def _create_dataloader(is_train: bool) -> DataLoader[List[torch.Tensor]]:
pass
@unittest.skipIf(IS_SANDCASTLE, "subprocess doesn't work in FB internal CI")
@unittest.skipIf(IS_WINDOWS, "No 'resource' module on Windows")
def test_fd_limit_exceeded(self):
import subprocess
subprocess.check_output([sys.executable, '-c', """\
import torch
import resource
from torch.utils.data import DataLoader, IterableDataset
class RandomDataset(IterableDataset):
def __init__(self, len, size):
super(RandomDataset).__init__()
self.len = len
self.size = size
def __iter__(self):
return self
def __next__(self):
if self.len <= 0:
raise StopIteration
self.len -= 1
return torch.randn(self.size)
try:
keep_fds_alive = []
resource.setrlimit(resource.RLIMIT_NOFILE, (100, 100))
for random_t in DataLoader(RandomDataset(200, (2,2)), multiprocessing_context="fork",
num_workers=1):
random_t.max(dim=0)
keep_fds_alive.append(random_t)
except RuntimeError as e:
assert "ulimit -n" in str(e)
assert "set_sharing_strategy" in str(e)
"""])
def test_invalid_assign_after_init(self):
dl = self._get_data_loader(self.dataset)
for attr in ('batch_size', 'sampler', 'batch_sampler', 'drop_last', 'dataset'):
def fn():
setattr(dl, attr, {})
self.assertRaises(ValueError, fn)
def test_sequential_nonbatch(self):
self._test_sequential(self._get_data_loader(self.dataset, batch_size=None))
def test_sequential_batch(self):
self._test_sequential(self._get_data_loader(self.dataset))
self._test_sequential(self._get_data_loader(self.dataset, batch_size=2))
def test_bulk_loading_nobatch(self):
n = 35
bs = 4
ds = BulkLoadingDataset(n)
sampler = BulkLoadingSampler(ds, batch_size=4)
for num_workers in [0, 4]:
dl = self._get_data_loader(ds, num_workers=num_workers, batch_size=None, sampler=sampler,
pin_memory=TEST_NPU, pin_memory_device='npu')
self.assertFalse(dl._auto_collation)
samples = list(dl)
self.assertEqual(samples[0].is_pinned(), TEST_NPU)
self.assertEqual(set(torch.cat(samples, 0).tolist()), set(range(n)))
def test_growing_dataset(self):
dataset = [torch.ones(4) for _ in range(4)]
dataloader_seq = self._get_data_loader(dataset, shuffle=False)
dataloader_shuffle = self._get_data_loader(dataset, shuffle=True)
dataset.append(torch.ones(4))
self.assertEqual(len(dataloader_seq), 5)
self.assertEqual(len(dataloader_shuffle), 5)
@unittest.skipIf(not TEST_NPU, "NPU unavailable")
def test_sequential_pin_memory(self):
loader = self._get_data_loader(self.dataset, batch_size=2, pin_memory=True, pin_memory_device='npu')
for input_, target in loader:
self.assertTrue(input_.is_pinned())
self.assertTrue(target.is_pinned())
@unittest.skipIf(IS_JETSON, "Not working on Jetson")
def test_multiple_dataloaders(self):
for multiprocessing_context in supported_multiprocessing_contexts:
loader1_it = iter(self._get_data_loader(self.dataset, num_workers=1))
loader2_it = iter(self._get_data_loader(self.dataset, num_workers=2, multiprocessing_context=multiprocessing_context))
next(loader1_it)
next(loader1_it)
next(loader2_it)
next(loader2_it)
next(loader1_it)
next(loader2_it)
del loader1_it
del loader2_it
def test_segfault(self):
p = ErrorTrackingProcess(target=_test_segfault)
p.start()
p.join(JOIN_TIMEOUT)
try:
self.assertFalse(p.is_alive())
self.assertNotEqual(p.exitcode, 0)
if IS_WINDOWS:
self.assertIsInstance(p.exception, OSError)
self.assertRegex(str(p.exception), r'access violation reading ')
else:
self.assertIsInstance(p.exception, RuntimeError)
self.assertRegex(str(p.exception), r'DataLoader worker \(pid \d+\) is killed by signal: ')
finally:
p.terminate()
@unittest.skipIf(IS_WINDOWS, "Needs fork")
def test_no_segfault(self):
p = ErrorTrackingProcess(target=_test_no_segfault)
p.start()
p.join(JOIN_TIMEOUT)
try:
self.assertFalse(p.is_alive())
if p.exception:
self.assertIsInstance(p.exception, RuntimeError)
self.assertRegex(str(p.exception), r'DataLoader worker \(pid \d+\) is killed by signal: ')
self.fail("Segfault occurred in worker process after fork")
finally:
p.terminate()
def test_timeout(self):
if TEST_NPU and not NO_MULTIPROCESSING_SPAWN:
targets = (_test_timeout, _test_timeout_pin_memory)
else:
targets = (_test_timeout,)
for target in targets:
p = ErrorTrackingProcess(target=target, args=(self.persistent_workers,))
p.start()
p.join(JOIN_TIMEOUT)
try:
self.assertFalse(p.is_alive())
self.assertNotEqual(p.exitcode, 0)
self.assertIsInstance(p.exception, RuntimeError)
self.assertRegex(str(p.exception), r'DataLoader timed out after \d+ seconds')
finally:
p.terminate()
def test_large_sampler_indices(self):
p = ErrorTrackingProcess(target=_test_large_sampler_indices, args=(self.persistent_workers,))
p.start()
p.join(JOIN_TIMEOUT)
try:
self.assertFalse(p.is_alive())
self.assertNotEqual(p.exitcode, 0)
self.assertIsInstance(p.exception, RuntimeError)
self.assertRegex(str(p.exception), r'My Error')
finally:
p.terminate()
def test_invalid_ctor_args_combinations(self):
with self.assertRaisesRegex(ValueError, "num_workers option should be non-negative"):
self._get_data_loader(self.dataset, num_workers=-1)
with self.assertRaisesRegex(ValueError, "timeout option should be non-negative"):
self._get_data_loader(self.dataset, timeout=-1)
with self.assertRaisesRegex(ValueError,
"batch_size=None option disables auto-batching and is mutually exclusive"):
self._get_data_loader(self.dataset, batch_size=None, drop_last=True)
valid_ctx = list(torch.multiprocessing.get_all_start_methods())[-1]
with self.assertRaisesRegex(ValueError, r"multi-process loading \(num_workers > 0\), but got"):
self._get_data_loader(self.dataset, num_workers=0, multiprocessing_context=valid_ctx)
with self.assertRaisesRegex(ValueError, "should specify a valid start method in"):
self._get_data_loader(self.dataset, num_workers=1, multiprocessing_context='bad')
with self.assertRaisesRegex(TypeError, "multiprocessing_context option should be a valid context "):
self._get_data_loader(self.dataset, num_workers=1, multiprocessing_context=object())
sampler = torch.utils.data.SequentialSampler(self.dataset)
batch_sampler = torch.utils.data.BatchSampler(sampler, 3, False)
with self.assertRaisesRegex(ValueError, "sampler option is mutually exclusive with shuffle"):
self._get_data_loader(self.dataset, batch_size=11, sampler=sampler, shuffle=True)
with self.assertRaisesRegex(ValueError, "sampler option is mutually exclusive with shuffle"):
self._get_data_loader(self.dataset, batch_sampler=batch_sampler, sampler=sampler, shuffle=True)
with self.assertRaisesRegex(ValueError, "sampler option is mutually exclusive with shuffle"):
self._get_data_loader(self.dataset, batch_sampler=batch_sampler, sampler=sampler, shuffle=3)
with self.assertRaisesRegex(ValueError, "batch_sampler option is mutually exclusive with"):
self._get_data_loader(self.dataset, batch_size=11, batch_sampler=batch_sampler)
with self.assertRaisesRegex(ValueError, "batch_sampler option is mutually exclusive with"):
self._get_data_loader(self.dataset, shuffle=True, batch_sampler=batch_sampler)
with self.assertRaisesRegex(ValueError, "batch_sampler option is mutually exclusive with"):
self._get_data_loader(self.dataset, drop_last=True, batch_sampler=batch_sampler)
with self.assertRaisesRegex(ValueError, "batch_sampler option is mutually exclusive with"):
self._get_data_loader(self.dataset, drop_last=3, batch_sampler=batch_sampler)
dataset = CountingIterableDataset(20)
with self.assertRaisesRegex(ValueError, "DataLoader with IterableDataset: expected unspecified shuffle"):
self._get_data_loader(dataset, shuffle=True)
with self.assertRaisesRegex(ValueError, "DataLoader with IterableDataset: expected unspecified shuffle"):
self._get_data_loader(dataset, shuffle=3)
with self.assertRaisesRegex(ValueError, "DataLoader with IterableDataset: expected unspecified sampler"):
self._get_data_loader(dataset, sampler=torch.utils.data.SequentialSampler(dataset))
with self.assertRaisesRegex(ValueError, "DataLoader with IterableDataset: expected unspecified sampler"):
self._get_data_loader(dataset, sampler=3)
with self.assertRaisesRegex(ValueError, "DataLoader with IterableDataset: expected unspecified batch_sampler"):
self._get_data_loader(dataset, batch_sampler=torch.utils.data.BatchSampler(
torch.utils.data.SequentialSampler(dataset), 3, False))
with self.assertRaisesRegex(ValueError, "DataLoader with IterableDataset: expected unspecified batch_sampler"):
self._get_data_loader(dataset, batch_sampler=3)
def test_builtin_collection_conversion(self):
for coll_ty in (list, tuple):
for num_workers in (0, 1):
dataset = CountingDataset(20)
fetched = coll_ty(self._get_data_loader(dataset, batch_size=None, num_workers=num_workers))
self.assertEqual(fetched, coll_ty(range(20)))
fetched = coll_ty(self._get_data_loader(dataset, batch_size=2, num_workers=num_workers))
self.assertEqual(fetched, coll_ty(torch.tensor([i, i + 1]) for i in range(0, 20, 2)))
dataset = CountingIterableDataset(20)
fetched = coll_ty(self._get_data_loader(dataset, batch_size=None, num_workers=num_workers))
self.assertEqual(fetched, coll_ty(range(20)))
assert num_workers in [0, 1], "invalid test"
fetched = coll_ty(self._get_data_loader(dataset, batch_size=2, num_workers=num_workers))
self.assertEqual(fetched, coll_ty(torch.tensor([i, i + 1]) for i in range(0, 20, 2)))
def test_iterable_style_dataset(self):
dataset = CountingIterableDataset(20)
dataloader = self._get_data_loader(dataset, batch_size=None)
fetched = list(dataloader)
self.assertEqual(len(fetched), 20)
for i, d in enumerate(fetched):
self.assertIsInstance(d, int)
self.assertEqual(d, i)
self.assertEqual(len(dataloader), len(dataset))
num_workers = 3
sizes_for_all_workers = [0, 4, 20]
expected = sorted(functools.reduce(operator.iadd, (list(range(s)) for s in sizes_for_all_workers), []))
assert len(sizes_for_all_workers) == num_workers, 'invalid test case'
for prefetch_factor in [2, 3, 4]:
dataset = WorkerSpecificIterableDataset(sizes_for_all_workers)
dataloader = self._get_data_loader(dataset, num_workers=num_workers, batch_size=None,
worker_init_fn=set_faulthander_if_available,
prefetch_factor=prefetch_factor)
dataloader_iter = iter(dataloader)
fetched = sorted(dataloader_iter)
for a, b in zip(fetched, expected):
self.assertIsInstance(a, int)
self.assertEqual(a, b)
self.assertEqual(len(dataloader), len(dataset))
dataset = CountingIterableDataset(20)
dataloader = self._get_data_loader(dataset, num_workers=num_workers,
worker_init_fn=set_faulthander_if_available,
prefetch_factor=prefetch_factor)
it = iter(dataloader)
for _ in range(40):
self.assertNotWarn(lambda: next(it), "Should not warn before accessing len(dataloader)")
self.assertEqual(len(dataloader), len(dataset))
self.assertEqual(len(dataloader), 20)
it = iter(dataloader)
for _ in range(20):
self.assertNotWarn(lambda: next(it), "Should not warn before exceeding length")
for _ in range(3):
with self.assertWarnsRegex(
UserWarning,
r"but [0-9]+ samples have been fetched\. For multiprocessing data-loading, this",
msg="Should always warn after exceeding length"):
next(it)
workers = dataloader_iter._workers
del dataloader_iter
del dataloader
try:
for w in workers:
w.join(JOIN_TIMEOUT)
self.assertFalse(w.is_alive())
self.assertEqual(w.exitcode, 0)
finally:
for w in workers:
w.terminate()
dataset = CountingIterableDataset(20)
fetched = list(self._get_data_loader(dataset, batch_size=7))
self.assertEqual(len(fetched), 3)
self.assertEqual(fetched[0].tolist(), list(range(7)))
self.assertEqual(fetched[1].tolist(), list(range(7, 14)))
self.assertEqual(fetched[2].tolist(), list(range(14, 20)))
num_workers = 3
sizes_for_all_workers = [0, 4, 20]
expected = sorted(functools.reduce(operator.iadd, (list(range(s)) for s in sizes_for_all_workers), []))
assert len(sizes_for_all_workers) == num_workers, 'invalid test case'
for prefetch_factor in [2, 3, 4]:
dataset = WorkerSpecificIterableDataset(sizes_for_all_workers)
dataloader = self._get_data_loader(dataset, num_workers=num_workers, batch_size=7, prefetch_factor=prefetch_factor)
dataloader_iter = iter(dataloader)
fetched = list(dataloader_iter)
self.assertEqual(len(fetched), 4)
fetched = {tuple(t.tolist()) for t in fetched}
self.assertEqual(fetched, {tuple(range(4)), tuple(range(7)), tuple(range(7, 14)), tuple(range(14, 20))})
workers = dataloader_iter._workers
del dataloader_iter
del dataloader
try:
for w in workers:
w.join(JOIN_TIMEOUT)
self.assertFalse(w.is_alive())
self.assertEqual(w.exitcode, 0)
finally:
for w in workers:
w.terminate()
dataset = CountingIterableDataset(20)
fetched = list(self._get_data_loader(dataset, batch_size=7, drop_last=True))
self.assertEqual(len(fetched), 2)
self.assertEqual(fetched[0].tolist(), list(range(7)))
self.assertEqual(fetched[1].tolist(), list(range(7, 14)))
num_workers = 3
sizes_for_all_workers = [0, 4, 20]
expected = sorted(functools.reduce(operator.iadd, (list(range(s)) for s in sizes_for_all_workers), []))
assert len(sizes_for_all_workers) == num_workers, 'invalid test case'
for prefetch_factor in [2, 3, 4]:
dataset = WorkerSpecificIterableDataset(sizes_for_all_workers)
dataloader = self._get_data_loader(dataset, num_workers=num_workers, batch_size=7, drop_last=True,
worker_init_fn=set_faulthander_if_available,
prefetch_factor=prefetch_factor)
dataloader_iter = iter(dataloader)
fetched = list(dataloader_iter)
self.assertEqual(len(fetched), 2)
fetched = {tuple(t.tolist()) for t in fetched}
self.assertEqual(fetched, {tuple(range(7)), tuple(range(7, 14))})
workers = dataloader_iter._workers
del dataloader_iter
del dataloader
try:
for w in workers:
w.join(JOIN_TIMEOUT)
self.assertFalse(w.is_alive())
self.assertEqual(w.exitcode, 0)
finally:
for w in workers:
w.terminate()
def test_chain_iterable_style_dataset(self):
dataset1 = CountingIterableDataset(20)
dataset2 = CountingIterableDataset(15)
expected = list(range(20)) + list(range(15))
for num_workers in [0, 1]:
for chained_dataset in [dataset1 + dataset2, ChainDataset([dataset1, dataset2])]:
fetched = list(self._get_data_loader(chained_dataset, num_workers=num_workers))
self.assertEqual(len(fetched), len(expected))
for e, d in zip(expected, fetched):
self.assertIsInstance(d, torch.Tensor)
self.assertEqual(e, d)
with self.assertRaisesRegex(AssertionError, "ChainDataset only supports IterableDataset"):
list(iter(dataset1 + self.dataset))
with self.assertRaisesRegex(AssertionError, "ChainDataset only supports IterableDataset"):
list(iter(ChainDataset([dataset1, self.dataset])))
@unittest.skipIf(IS_MACOS, "Not working on macos")
@unittest.skipIf(IS_MACOS or IS_JETSON, "Not working on macos or Jetson")
@skipIfRocm
def test_multiprocessing_contexts(self):
reference = [
torch.arange(3),
torch.arange(3, 6),
torch.arange(6, 9),
torch.arange(9, 11),
]
counting_ds_n = 11
dl_common_args = dict(num_workers=3, batch_size=3, pin_memory=(not TEST_NPU))
for ctx in supported_multiprocessing_contexts:
if ctx in ['spawn', 'forkserver'] and TEST_NPU and not IS_WINDOWS and not IS_JETSON:
ds_cls = NPUCountingDataset
else:
ds_cls = CountingDataset
self.assertEqual(
reference, list(self._get_data_loader(ds_cls(counting_ds_n), multiprocessing_context=ctx, **dl_common_args)))
if ctx is not None:
ctx = mp.get_context(ctx)
self.assertEqual(
reference, list(self._get_data_loader(ds_cls(counting_ds_n), multiprocessing_context=ctx, **dl_common_args)))
@skipIfNoNumpy
@unittest.skipIf(IS_JETSON, "Not working on Jetson")
def test_multiprocessing_iterdatapipe(self):
reference = [torch.as_tensor([[2, 3, 4, 5]], dtype=torch.int64),
torch.as_tensor([[2, 3, 4, 5]], dtype=torch.int64)]
datapipe: IterDataPipe = IterableWrapper([[1, 2, 3, 4], [1, 2, 3, 4, 5, 6]])
datapipe = datapipe.map(row_processor)
datapipe = datapipe.filter(lambda row: len(row) == 4) if HAS_DILL else datapipe.filter(filter_len)
dl_common_args = dict(num_workers=2, batch_size=2, shuffle=True, pin_memory=(not TEST_NPU))
for ctx in supported_multiprocessing_contexts:
self.assertEqual(reference,
[t.type(torch.int64)
for t in self._get_data_loader(datapipe, multiprocessing_context=ctx, **dl_common_args)])
if ctx is not None:
ctx = mp.get_context(ctx)
self.assertEqual(reference,
[t.type(torch.int64)
for t in
self._get_data_loader(datapipe, multiprocessing_context=ctx, **dl_common_args)])
def test_worker_seed(self):
num_workers = 6
batch_size = 1
dataset = SynchronizedSeedDataset(num_workers, batch_size, num_workers)
dataloader = self._get_data_loader(dataset, batch_size=batch_size, num_workers=num_workers)
seeds = set()
for batch in dataloader:
seeds.add(batch[0])
self.assertEqual(len(seeds), num_workers)
def test_worker_seed_reproducibility(self):
def get_dataloader():
return DataLoader(dataset, batch_size=batch_size, num_workers=num_workers, generator=torch.Generator().manual_seed(42))
num_workers = 6
batch_size = 1
dataset = SynchronizedSeedDataset(num_workers, batch_size, num_workers)
self.assertEqual({int(batch) for batch in get_dataloader()}, {int(batch) for batch in get_dataloader()})
def test_multi_epochs_reproducibility(self):
num_workers = 2
batch_size = 10
num_epochs = 3
dataset = TestMultiEpochDataset(batch_size * num_workers)
dataloader = self._get_data_loader(dataset, batch_size=batch_size,
shuffle=False, num_workers=num_workers)
for ind in range(num_epochs):
for batch_idx, sample in enumerate(dataloader):
self.assertEqual(sample.tolist(), [batch_idx % num_workers] * batch_size)
def test_worker_init_fn(self):
dataset = SeedDataset(4)
dataloader = self._get_data_loader(dataset, batch_size=2, num_workers=2,
worker_init_fn=init_fn)
for batch in dataloader:
self.assertEqual(12345, batch[0])
self.assertEqual(12345, batch[1])
def test_get_worker_info(self):
p = ErrorTrackingProcess(target=_test_get_worker_info)
p.start()
p.join(JOIN_TIMEOUT)
try:
self.assertFalse(p.is_alive())
self.assertEqual(p.exitcode, 0)
finally:
p.terminate()
def test_shuffle(self):
self._test_shuffle(self._get_data_loader(self.dataset, shuffle=True))
def test_shuffle_batch_none(self):
self._test_shuffle(DataLoader(self.dataset, batch_size=None, shuffle=True))
def test_shuffle_batch(self):
self._test_shuffle(self._get_data_loader(self.dataset, batch_size=2, shuffle=True))
def test_shuffle_reproducibility(self):
for fn in (
lambda: DataLoader(self.dataset, shuffle=True, num_workers=0, generator=torch.Generator().manual_seed(42)),
lambda: DataLoader(self.dataset, shuffle=True, num_workers=2, generator=torch.Generator().manual_seed(42)),
):
self.assertEqual(list(fn()), list(fn()))
def test_sequential_workers(self):
self._test_sequential(self._get_data_loader(self.dataset, num_workers=4))
def test_seqential_batch_workers(self):
self._test_sequential(self._get_data_loader(self.dataset, batch_size=2, num_workers=4))
def test_seqential_batch_workers_prefetch(self):
self._test_sequential(DataLoader(self.dataset, batch_size=2, num_workers=4, prefetch_factor=3))
def test_shuffle_workers(self):
self._test_shuffle(self._get_data_loader(self.dataset, shuffle=True, num_workers=4))
def test_shuffle_batch_workers(self):
self._test_shuffle(self._get_data_loader(self.dataset, batch_size=2, shuffle=True, num_workers=4))
def test_shuffle_batch_workers_prefetch(self):
self._test_shuffle(DataLoader(self.dataset, batch_size=2, shuffle=True, num_workers=4, prefetch_factor=3))
def test_random_sampler(self):
from collections import Counter
from torch.utils.data import RandomSampler
def sample_stat(sampler, num_samples):
counts = Counter(sampler)
count_repeated = sum(val > 1 for val in counts.values())
return (count_repeated, min(counts.keys()), max(counts.keys()), sum(counts.values()))
n = len(self.dataset) + 1
sampler_with_replacement = RandomSampler(self.dataset, replacement=True, num_samples=n)
count_repeated, minval, maxval, count_total = sample_stat(sampler_with_replacement, n)
self.assertTrue(count_repeated > 0)
self.assertTrue(minval >= 0)
self.assertTrue(maxval < len(self.dataset))
self.assertTrue(count_total == n)
sampler_without_replacement = RandomSampler(self.dataset)
count_repeated, minval, maxval, count_total = sample_stat(sampler_without_replacement, len(self.dataset))
self.assertTrue(count_repeated == 0)
self.assertTrue(minval == 0)
self.assertTrue(maxval == len(self.dataset) - 1)
self.assertTrue(count_total == len(self.dataset))
n = len(self.dataset) * 2
sampler_without_replacement = RandomSampler(self.dataset, num_samples=n)
count_repeated, minval, maxval, count_total = sample_stat(sampler_without_replacement, len(self.dataset))
self.assertTrue(count_repeated == len(self.dataset))
self.assertTrue(minval == 0)
self.assertTrue(maxval == len(self.dataset) - 1)
self.assertTrue(count_total == n)
n = len(self.dataset) - 1
sampler_without_replacement = RandomSampler(self.dataset, num_samples=n)
count_repeated, minval, maxval, count_total = sample_stat(sampler_without_replacement, len(self.dataset))
self.assertTrue(count_repeated == 0)
self.assertTrue(minval >= 0)
self.assertTrue(maxval < len(self.dataset))
self.assertTrue(count_total == n)
n = len(self.dataset) + 1
sampler_without_replacement = RandomSampler(self.dataset, num_samples=n)
count_repeated, minval, maxval, count_total = sample_stat(sampler_without_replacement, len(self.dataset))
self.assertTrue(count_repeated == 1)
self.assertTrue(minval == 0)
self.assertTrue(maxval == len(self.dataset) - 1)
self.assertTrue(count_total == n)
with self.assertRaisesRegex(TypeError, "replacement should be a boolean value, but got replacement=0"):
RandomSampler(self.dataset, replacement=0)
def test_random_sampler_len_with_replacement(self):
from torch.utils.data import RandomSampler
num_samples = len(self.dataset) + 5
sampler = RandomSampler(self.dataset,
replacement=True,
num_samples=num_samples)
self.assertEqual(num_samples, len(sampler))
count_num_samples = sum(1 for _ in sampler)
self.assertEqual(num_samples, count_num_samples)
batch_size = 1
count_num_samples_in_data_loader = len(self._get_data_loader(
self.dataset, batch_size=batch_size, sampler=sampler))
self.assertEqual(num_samples, count_num_samples_in_data_loader)
batch_size = 6
count_num_samples_in_data_loader = len(self._get_data_loader(
self.dataset, batch_size=batch_size, sampler=sampler))
self.assertEqual(int(math.ceil(float(num_samples) / batch_size)),
count_num_samples_in_data_loader)
def test_random_sampler_len_without_replacement(self):
from torch.utils.data import RandomSampler
num_samples = len(self.dataset) + 5
sampler = RandomSampler(self.dataset,
replacement=False,
num_samples=num_samples)
self.assertEqual(num_samples, len(sampler))
count_num_samples = sum(1 for _ in sampler)
self.assertEqual(num_samples, count_num_samples)
batch_size = 1
count_num_samples_in_data_loader = len(self._get_data_loader(
self.dataset, batch_size=batch_size, sampler=sampler))
self.assertEqual(num_samples, count_num_samples_in_data_loader)
batch_size = 6
count_num_samples_in_data_loader = len(self._get_data_loader(
self.dataset, batch_size=batch_size, sampler=sampler))
self.assertEqual(num_samples // batch_size + (num_samples % batch_size > 0),
count_num_samples_in_data_loader)
def test_distributed_sampler_invalid_rank(self):
from torch.utils.data.distributed import DistributedSampler
dataset = torch.IntTensor(range(10))
with self.assertRaisesRegex(ValueError, "Invalid rank"):
sampler = DistributedSampler(dataset, 3, 3)
with self.assertRaisesRegex(ValueError, "Invalid rank"):
sampler = DistributedSampler(dataset, 3, -1)
def test_duplicating_data_with_drop_last(self):
from torch.utils.data.distributed import DistributedSampler
num_processes = 4
num_batches = 9
data_set = torch.IntTensor(range(num_batches))
scanned_data = torch.IntTensor([])
for i in range(num_processes):
s = DistributedSampler(data_set, num_processes, i)
d_loader = self._get_data_loader(data_set, batch_size=int(num_batches / num_processes), drop_last=True, sampler=s)
for data in d_loader:
scanned_data = torch.cat((scanned_data, data), 0)
self.assertEqual(scanned_data.size(), scanned_data.unique().size())
def test_sampler_reproducibility(self):
from torch.utils.data import RandomSampler, WeightedRandomSampler, SubsetRandomSampler
weights = [0.1, 0.9, 0.4, 0.7, 3.0, 0.6]
for fn in (
lambda: RandomSampler(self.dataset, num_samples=5, replacement=True, generator=torch.Generator().manual_seed(42)),
lambda: RandomSampler(self.dataset, replacement=False, generator=torch.Generator().manual_seed(42)),
lambda: WeightedRandomSampler(weights, num_samples=5, replacement=True, generator=torch.Generator().manual_seed(42)),
lambda: WeightedRandomSampler(weights, num_samples=5, replacement=False, generator=torch.Generator().manual_seed(42)),
lambda: SubsetRandomSampler(range(10), generator=torch.Generator().manual_seed(42)),
):
self.assertEqual(list(fn()), list(fn()))
for sampler in (
RandomSampler(self.dataset, num_samples=5, replacement=True),
RandomSampler(self.dataset, replacement=False),
WeightedRandomSampler(weights, num_samples=5, replacement=True),
WeightedRandomSampler(weights, num_samples=5, replacement=False),
SubsetRandomSampler(range(10)),
):
torch.manual_seed(0)
l1 = list(sampler) + list(sampler)
torch.manual_seed(0)
l2 = list(sampler) + list(sampler)
self.assertEqual(l1, l2)
its = (iter(sampler), iter(sampler))
ls = ([], [])
for idx in range(len(sampler)):
for i in range(2):
if idx == 0:
torch.manual_seed(0)
ls[i].append(next(its[i]))
self.assertEqual(ls[0], ls[1])
def _test_sampler(self, **kwargs):
indices = range(2, 12)
dl = self._get_data_loader(self.dataset, sampler=indices, batch_size=2, **kwargs)
self.assertEqual(len(dl), 5)
for i, (input_, _target) in enumerate(dl):
self.assertEqual(len(input_), 2)
self.assertEqual(input_, self.data[i * 2 + 2:i * 2 + 4])
def test_sampler(self):
self._test_sampler()
self._test_sampler(num_workers=4)
if not NO_MULTIPROCESSING_SPAWN:
self._test_batch_sampler(num_workers=4, multiprocessing_context='spawn')
def _test_batch_sampler(self, **kwargs):
batches = []
for i in range(0, 20, 5):
batches.append(tuple(range(i, i + 2)))
batches.append(tuple(range(i + 2, i + 5)))
dl = self._get_data_loader(self.dataset, batch_sampler=batches, **kwargs)
self.assertEqual(len(dl), 8)
for i, (input_, _target) in enumerate(dl):
if i % 2 == 0:
offset = i * 5 // 2
self.assertEqual(len(input_), 2)
self.assertEqual(input_, self.data[offset:offset + 2])
else:
offset = i * 5 // 2
self.assertEqual(len(input_), 3)
self.assertEqual(input_, self.data[offset:offset + 3])
def test_batch_sampler(self):
self._test_batch_sampler()
self._test_batch_sampler(num_workers=4)
if not NO_MULTIPROCESSING_SPAWN:
self._test_batch_sampler(num_workers=4, multiprocessing_context='spawn')
@unittest.skipIf(not TEST_NPU, "NPU unavailable")
def test_shuffle_pin_memory(self):
loader = self._get_data_loader(self.dataset, batch_size=2, shuffle=True, num_workers=4,
pin_memory=True, pin_memory_device='npu')
for input_, target in loader:
self.assertTrue(input_.is_pinned())
self.assertTrue(target.is_pinned())
@unittest.skipIf(not TEST_NUMPY, "numpy unavailable")
def test_numpy(self):
import numpy as np
class TestDataset(torch.utils.data.Dataset):
def __getitem__(self, i):
return np.ones((2, 3, 4)) * i
def __len__(self):
return 1000
loader = self._get_data_loader(TestDataset(), batch_size=12)
batch = next(iter(loader))
self.assertIsInstance(batch, torch.DoubleTensor)
self.assertEqual(batch.size(), torch.Size([12, 2, 3, 4]))
@unittest.skipIf(not TEST_NUMPY, "numpy unavailable")
def test_numpy_gen_state(self):
from torch.utils.data._utils.worker import _generate_state
test_cases = [
((4, 13434589827475259383), (2884386318, 1088094898, 3523808998, 3860348662)),
((1, 15014285634777110771), (1934848465, 763213760, 2959016433, 179751970)),
((10, 978296274032934101), (1759791917, 3550927336, 1225977135, 1036538043)),
((12, 11868770762134256968), (3974661794, 3331131333, 3630387033, 2885815368)),
((9, 15378787925219019706), (3815056996, 3162224466, 2735102421, 3190253477)),
((5, 9055612723125076328), (3522565701, 3368424109, 959377806, 621878693)),
((15, 14617792358407278405), (3402479508, 1588702753, 1169536393, 3675067356)),
((9, 17363320784006640087), (957989458, 2518334477, 1421725660, 3086155459)),
((12, 480002904169484764), (2732851467, 1762620729, 4055801988, 1277640511)),
((15, 16803975943592702950), (3479415043, 4022359553, 295994005, 3358606349)),
((9, 11704776406047813044), (1968928009, 710113752, 2442656196, 1587420279)),
((10, 16357891985431864516), (1271733898, 4197047399, 3727213786, 2338547348)),
((2, 17423369006318065007), (544294336, 1911284083, 3299147734, 3231058347)),
((2, 2889492011444113593), (3721591783, 2595811276, 2212881745, 977682627)),
((0, 8979703111668486195), (4276723937, 2556068849, 2962827292, 233130238)),
((6, 6269787272229682235), (2548857855, 1216457374, 1012973562, 2999759647))
]
for (worker_id, base_seed), exp in test_cases:
self.assertEqual(exp, _generate_state(base_seed, worker_id))
def test_error(self):
self._test_error(self._get_data_loader(ErrorDataset(100), batch_size=2, shuffle=True))
def test_error_workers(self):
self._test_error(self._get_data_loader(ErrorDataset(41), batch_size=2, shuffle=True, num_workers=4))
@unittest.skipIf(IS_WINDOWS, "FIXME: stuck test")
def test_partial_workers(self):
r"""Check that workers exit even if the iterator is not exhausted."""
if TEST_NPU:
pin_memory_configs = (True, False)
else:
pin_memory_configs = (False,)
for pin_memory in pin_memory_configs:
loader = iter(self._get_data_loader(self.dataset, batch_size=2, num_workers=4, pin_memory=pin_memory,
pin_memory_device='npu'))
workers = loader._workers
if pin_memory:
pin_memory_thread = loader._pin_memory_thread
for i, _ in enumerate(loader):
if i == 10:
break
assert i == 10
del loader
for w in workers:
w.join(JOIN_TIMEOUT)
self.assertFalse(w.is_alive(), 'subprocess not terminated')
if pin_memory:
pin_memory_thread.join(JOIN_TIMEOUT)
self.assertFalse(pin_memory_thread.is_alive())
@skipIfRocm
@unittest.skipIf(not HAS_PSUTIL, "psutil not found")
@slowTest
def test_proper_exit(self):
(r'''There might be ConnectionResetError or leaked semaphore warning '''
r'''(due to dirty process exit), but they are all safe to ignore''')
for is_iterable_dataset, use_workers, pin_memory, hold_iter_reference in \
itertools.product([True, False], repeat=4):
if pin_memory and (not TEST_NPU or NO_MULTIPROCESSING_SPAWN or IS_WINDOWS):
continue
if use_workers:
exit_methods = [None, 'loader_error', 'worker_error', 'worker_kill']
persistent_workers = self.persistent_workers
else:
exit_methods = [None, 'loader_error', 'loader_kill']
persistent_workers = False
for exit_method in exit_methods:
if exit_method == 'worker_kill':
continue
desc = []
desc.append(f'is_iterable_dataset={is_iterable_dataset}')
desc.append(f'use_workers={use_workers}')
desc.append(f'pin_memory={pin_memory}')
desc.append(f'hold_iter_reference={hold_iter_reference}')
desc.append(f'exit_method={exit_method}')
desc = 'test_proper_exit with ' + ', '.join(desc)
loader_setup_event = mp.Event()
tester_setup_event = mp.Event()
loader_p = ErrorTrackingProcess(target=_test_proper_exit,
args=(is_iterable_dataset, use_workers, pin_memory,
exit_method, hold_iter_reference,
loader_setup_event, tester_setup_event,
persistent_workers),
disable_stderr=False)
loader_p.start()
loader_psutil_p = psutil.Process(loader_p.pid)
loader_setup_event.wait(timeout=JOIN_TIMEOUT)
if not loader_setup_event.is_set():
fail_msg = desc + ': loader process failed to setup within given time'
if loader_p.exception is not None:
fail_msg += f', and had exception {loader_p.exception}'
elif not loader_p.is_alive():
fail_msg += f', and exited with code {loader_p.exitcode} but had no exception'
else:
fail_msg += ', and is still alive.'
if loader_p.is_alive():
loader_p.print_traces_of_all_threads()
self.fail(fail_msg)
worker_psutil_ps = loader_psutil_p.children()
def fail(reason):
report_psutil_attrs = ['pid', 'name', 'cpu_times', 'io_counters',
'memory_full_info', 'num_ctx_switches',
'open_files', 'threads', 'status',
'nice', 'ionice']
if reason is None:
err_msgs = desc
else:
err_msgs = f'{desc}: {reason}'
err_msgs += '\nLoader info:\n\t'
if loader_psutil_p.is_running():
err_msgs += str(loader_psutil_p.as_dict(attrs=report_psutil_attrs))
loader_p.print_traces_of_all_threads()
else:
err_msgs += f'exited with code {loader_p.exitcode}'
if use_workers:
err_msgs += '\nWorker(s) info:'
for idx, worker_psutil_p in enumerate(worker_psutil_ps):
err_msgs += f'\n\tWorker {idx}:\n\t\t'
if worker_psutil_p.is_running():
err_msgs += str(worker_psutil_p.as_dict(attrs=report_psutil_attrs))
print_traces_of_all_threads(worker_psutil_p.pid)
else:
err_msgs += 'exited with unknown code'
self.fail(err_msgs)
tester_setup_event.set()
try:
loader_p.join(JOIN_TIMEOUT + MP_STATUS_CHECK_INTERVAL)
if loader_p.is_alive():
fail_reason = 'loader process did not terminate'
if loader_p.exception is not None:
fail(fail_reason + f', and had exception {loader_p.exception}')
else:
fail(fail_reason + ', and had no exception')
_, alive = psutil.wait_procs(worker_psutil_ps, timeout=(MP_STATUS_CHECK_INTERVAL + JOIN_TIMEOUT))
if len(alive) > 0:
fail('worker process (pid(s) {}) did not terminate'.format(
', '.join(str(p.pid) for p in alive)))
if exit_method is None:
if loader_p.exitcode != 0:
fail(f'loader process had nonzero exitcode {loader_p.exitcode}')
else:
if loader_p.exitcode == 0:
fail('loader process had zero exitcode')
if exit_method == 'loader_error':
if not isinstance(loader_p.exception, RuntimeError) or \
'Loader error' not in str(loader_p.exception):
fail(f'loader process did not raise expected exception, but had {loader_p.exception}')
elif exit_method == 'worker_kill':
if isinstance(loader_p.exception, RuntimeError):
if 'DataLoader worker (pid' not in str(loader_p.exception):
fail('loader process did not raise expected exception, but had {}'.format(
loader_p.exception))
elif isinstance(loader_p.exception, ConnectionRefusedError):
pass
else:
fail(f'loader process did not raise expected exception, but had {loader_p.exception}')
elif exit_method == 'worker_error':
if not isinstance(loader_p.exception, RuntimeError) or \
'Worker error' not in str(loader_p.exception):
fail(f'loader process did not raise expected exception, but had {loader_p.exception}')
finally:
loader_p.terminate()
def test_len(self):
def check_len(dl, expected):
self.assertEqual(len(dl), expected)
n = 0
for _ in dl:
n += 1
self.assertEqual(n, expected)
check_len(self.dataset, 100)
check_len(self._get_data_loader(self.dataset, batch_size=2), 50)
check_len(self._get_data_loader(self.dataset, batch_size=3), 34)
def test_iterabledataset_len(self):
class IterableDataset(torch.utils.data.IterableDataset):
def __len__(self):
return 10
def __iter__(self):
return iter(range(10))
iterable_loader = DataLoader(IterableDataset(), batch_size=1)
self.assertEqual(len(iterable_loader), 10)
iterable_loader = DataLoader(IterableDataset(), batch_size=1, drop_last=True)
self.assertEqual(len(iterable_loader), 10)
iterable_loader = DataLoader(IterableDataset(), batch_size=2)
self.assertEqual(len(iterable_loader), 5)
iterable_loader = DataLoader(IterableDataset(), batch_size=2, drop_last=True)
self.assertEqual(len(iterable_loader), 5)
iterable_loader = DataLoader(IterableDataset(), batch_size=3)
self.assertEqual(len(iterable_loader), 4)
iterable_loader = DataLoader(IterableDataset(), batch_size=3, drop_last=True)
self.assertEqual(len(iterable_loader), 3)
@unittest.skipIf(not TEST_NUMPY, "numpy unavailable")
def test_numpy_scalars(self):
import numpy as np
class ScalarDataset(torch.utils.data.Dataset):
def __init__(self, dtype):
self.dtype = dtype
def __getitem__(self, i):
return self.dtype()
def __len__(self):
return 4
dtypes = {
np.float64: torch.DoubleTensor,
np.float32: torch.FloatTensor,
np.float16: torch.HalfTensor,
np.int64: torch.LongTensor,
np.int32: torch.IntTensor,
np.int16: torch.ShortTensor,
np.int8: torch.CharTensor,
np.uint8: torch.ByteTensor,
}
for dt, tt in dtypes.items():
dset = ScalarDataset(dt)
loader = self._get_data_loader(dset, batch_size=2)
batch = next(iter(loader))
self.assertIsInstance(batch, tt)
def test_default_convert_mapping_keep_type(self):
data = CustomDict({"a": 1, "b": 2})
converted = _utils.collate.default_convert(data)
self.assertEqual(converted, data)
def test_default_convert_sequence_keep_type(self):
data = CustomList([1, 2, 3])
converted = _utils.collate.default_convert(data)
self.assertEqual(converted, data)
def test_default_convert_sequence_dont_keep_type(self):
data = range(2)
converted = _utils.collate.default_convert(data)
self.assertEqual(converted, [0, 1])
def test_default_collate_dtype(self):
arr = [1, 2, -1]
collated = _utils.collate.default_collate(arr)
self.assertEqual(collated, torch.tensor(arr))
self.assertEqual(collated.dtype, torch.int64)
arr = [1.1, 2.3, -0.9]
collated = _utils.collate.default_collate(arr)
self.assertEqual(collated, torch.tensor(arr, dtype=torch.float64))
arr = [True, False]
collated = _utils.collate.default_collate(arr)
self.assertEqual(collated, torch.tensor(arr))
self.assertEqual(collated.dtype, torch.bool)
arr = ['a', 'b', 'c']
self.assertEqual(arr, _utils.collate.default_collate(arr))
def test_default_collate_mapping_keep_type(self):
batch = [CustomDict({"a": 1, "b": 2}), CustomDict({"a": 3, "b": 4})]
collated = _utils.collate.default_collate(batch)
expected = CustomDict({"a": torch.tensor([1, 3]), "b": torch.tensor([2, 4])})
self.assertEqual(collated, expected)
def test_default_collate_sequence_keep_type(self):
batch = [CustomList([1, 2, 3]), CustomList([4, 5, 6])]
collated = _utils.collate.default_collate(batch)
expected = CustomList([
torch.tensor([1, 4]),
torch.tensor([2, 5]),
torch.tensor([3, 6]),
])
self.assertEqual(collated, expected)
def test_default_collate_sequence_dont_keep_type(self):
batch = [range(2), range(2)]
collated = _utils.collate.default_collate(batch)
self.assertEqual(collated, [torch.tensor([0, 0]), torch.tensor([1, 1])])
@unittest.skipIf(not TEST_NUMPY, "numpy unavailable")
def test_default_collate_bad_numpy_types(self):
import numpy as np
arr = np.array(['a', 'b', 'c'])
self.assertEqual(arr, _utils.collate.default_collate(arr))
arr = np.array([[['a', 'b', 'c']]])
self.assertRaises(TypeError, lambda: _utils.collate.default_collate(arr))
arr = np.array([object(), object(), object()])
self.assertRaises(TypeError, lambda: _utils.collate.default_collate(arr))
arr = np.array([[[object(), object(), object()]]])
self.assertRaises(TypeError, lambda: _utils.collate.default_collate(arr))
@unittest.skipIf(not TEST_NUMPY, "numpy unavailable")
def test_default_collate_numpy_memmap(self):
import numpy as np
with tempfile.TemporaryFile() as f:
arr = np.array([[0, 1], [2, 3], [4, 5], [6, 7]])
arr_memmap = np.memmap(f, dtype=arr.dtype, mode='w+', shape=arr.shape)
arr_memmap[:] = arr[:]
arr_new = np.memmap(f, dtype=arr.dtype, mode='r', shape=arr.shape)
tensor = _utils.collate.default_collate(list(arr_new))
self.assertTrue((tensor == tensor.new_tensor([[0, 1], [2, 3], [4, 5], [6, 7]])).all().item())
def test_default_collate_bad_sequence_type(self):
batch = [['X'], ['X', 'X']]
self.assertRaises(RuntimeError, lambda: _utils.collate.default_collate(batch))
self.assertRaises(RuntimeError, lambda: _utils.collate.default_collate(batch[::-1]))
@unittest.skipIf(not TEST_NUMPY, "numpy unavailable")
def test_default_collate_shared_tensor(self):
import numpy as np
t_in = torch.zeros(1)
n_in = np.zeros(1)
self.assertEqual(t_in.is_shared(), False)
self.assertEqual(_utils.collate.default_collate([t_in]).is_shared(), False)
self.assertEqual(_utils.collate.default_collate([n_in]).is_shared(), False)
old = _utils.worker._worker_info
try:
_utils.worker._worker_info = 'x'
self.assertEqual(_utils.collate.default_collate([t_in]).is_shared(), True)
self.assertEqual(_utils.collate.default_collate([n_in]).is_shared(), True)
finally:
_utils.worker._worker_info = old
def test_excessive_thread_creation_warning(self):
with self.assertWarnsRegex(
UserWarning,
r"excessive worker creation might get DataLoader running slow or even freeze"):
dataloader = DataLoader(self.dataset, batch_size=2, num_workers=1000)
class IntegrationTestDataLoaderDataPipe(TestCase):
r"""
Verify the behavior of a certain ``DataPipes`` with ``DataLoader``
"""
def test_shuffler_iterdatapipe(self):
r"""
Verify ``IterDataPipe.shuffle`` is controlled by ``DataLoader``
to generate different seeds deterministically per epoch.
"""
exp = list(range(100))
def _create_dp(buffer_size):
input_ds = dp.iter.IterableWrapper(exp)
return input_ds.shuffle(buffer_size=buffer_size).sharding_filter()
for bs in (5, 20, 33):
for num_workers, pw in itertools.product((0, 1, 2), (True, False)):
if num_workers == 0 and pw:
continue
shuffle_dp = _create_dp(bs)
mp_ctx = "spawn" if num_workers > 0 else None
dl = DataLoader(
shuffle_dp,
num_workers=num_workers,
shuffle=True,
multiprocessing_context=mp_ctx,
persistent_workers=pw
)
dl_res_ns = list(dl)
self.assertEqual(sorted(dl_res_ns), exp)
dl_res = []
for epoch in range(2):
torch.manual_seed(123)
dl_res.append(list(dl))
self.assertEqual(dl_res[0], dl_res[1])
self.assertEqual(sorted(dl_res[0]), exp)
torch.manual_seed(321)
dl_res.append(list(dl))
self.assertEqual(len(dl_res[0]), len(dl_res[2]))
self.assertNotEqual(dl_res[0], dl_res[2])
self.assertEqual(sorted(dl_res[0]), sorted(dl_res[2]))
if dl._iterator is not None:
dl._iterator._shutdown_workers()
dl._iterator = None
del dl
class StringDataset(Dataset):
def __init__(self):
self.s = '12345'
def __len__(self):
return len(self.s)
def __getitem__(self, ndx):
return (self.s[ndx], ndx)
@unittest.skipIf(
TEST_WITH_TSAN,
"Fails with TSAN with the following error: starting new threads after multi-threaded "
"fork is not supported. Dying (set die_after_fork=0 to override)")
class TestStringDataLoader(TestCase):
def setUp(self):
super().setUp()
self.dataset = StringDataset()
@unittest.skipIf(not TEST_NPU, "NPU unavailable")
def test_shuffle_pin_memory(self):
loader = DataLoader(self.dataset, batch_size=2, shuffle=True, num_workers=4, pin_memory=True)
for (s, n) in loader:
self.assertIsInstance(s[0], str)
self.assertTrue(n.is_pinned())
class DictDataset(Dataset):
def __len__(self):
return 4
def __getitem__(self, ndx):
return {
'a_tensor': torch.empty(4, 2).fill_(ndx),
'another_dict': {
'a_number': ndx,
},
}
@unittest.skipIf(
TEST_WITH_TSAN,
"Fails with TSAN with the following error: starting new threads after multi-threaded "
"fork is not supported. Dying (set die_after_fork=0 to override)")
class TestDictDataLoader(TestCase):
def setUp(self):
super().setUp()
self.dataset = DictDataset()
def test_sequential_batch(self):
for persistent_workers in (False, True):
if persistent_workers:
loader = DataLoader(self.dataset, batch_size=2, shuffle=False,
persistent_workers=persistent_workers, num_workers=1)
else:
loader = DataLoader(self.dataset, batch_size=2, shuffle=False,
persistent_workers=persistent_workers)
batch_size = loader.batch_size
for i, sample in enumerate(loader):
idx = i * batch_size
self.assertEqual(set(sample.keys()), {'a_tensor', 'another_dict'})
self.assertEqual(set(sample['another_dict'].keys()), {'a_number'})
t = sample['a_tensor']
self.assertEqual(t.size(), torch.Size([batch_size, 4, 2]))
self.assertTrue((t[0] == idx).all())
self.assertTrue((t[1] == idx + 1).all())
n = sample['another_dict']['a_number']
self.assertEqual(n.size(), torch.Size([batch_size]))
self.assertEqual(n[0], idx)
self.assertEqual(n[1], idx + 1)
@unittest.skipIf(not TEST_NPU, "NPU unavailable")
def test_pin_memory(self):
from torch_npu.contrib import transfer_to_npu
loader = DataLoader(self.dataset, batch_size=2, pin_memory=True)
for sample in loader:
self.assertTrue(sample['a_tensor'].is_pinned())
self.assertTrue(sample['another_dict']['a_number'].is_pinned())
@unittest.skipIf(not TEST_NPU, "NPU unavailable")
def test_pin_memory_device(self):
loader = DataLoader(self.dataset, batch_size=2, pin_memory=True, pin_memory_device='npu')
for sample in loader:
self.assertTrue(sample['a_tensor'].is_pinned(device='npu'))
self.assertTrue(sample['another_dict']['a_number'].is_pinned(device='npu'))
@unittest.skipIf(not TEST_NPU, "NPU unavailable")
def test_pin_memory_with_only_device(self):
loader = DataLoader(self.dataset, batch_size=2, pin_memory_device='npu')
for sample in loader:
self.assertFalse(sample['a_tensor'].is_pinned(device='npu'))
self.assertFalse(sample['another_dict']['a_number'].is_pinned(device='npu'))
class DummyDataset(torch.utils.data.Dataset):
def __init__(self):
self.data = list(range(10))
def __len__(self):
return len(self.data)
def __getitem__(self, idx):
if torch.is_tensor(idx):
idx = idx.tolist()
assert self.start == 0
return self.data[idx]
@unittest.skipIf(
TEST_WITH_TSAN,
"Fails with TSAN with the following error: starting new threads after multi-threaded "
"fork is not supported. Dying (set die_after_fork=0 to override)")
@unittest.skipIf(
TEST_WITH_ASAN, "DataLoader tests hang in ASAN, see: pytorch issues 66223")
class TestDataLoaderPersistentWorkers(TestDataLoader):
def setUp(self):
super().setUp()
self.persistent_workers = True
@unittest.skipIf(IS_SANDCASTLE, "subprocess doesn't work in FB internal CI")
@unittest.skipIf(IS_WINDOWS, "No 'resource' module on Windows")
def test_fd_limit_exceeded(self):
import subprocess
subprocess.check_output([sys.executable, '-c', """\
import torch
import resource
from torch.utils.data import DataLoader, IterableDataset
class RandomDataset(IterableDataset):
def __init__(self, len, size):
super(RandomDataset).__init__()
self.len = len
self.size = size
def __iter__(self):
return self
def __next__(self):
if self.len <= 0:
raise StopIteration
self.len -= 1
return torch.randn(self.size)
try:
keep_fds_alive = []
resource.setrlimit(resource.RLIMIT_NOFILE, (100, 100))
for random_t in DataLoader(RandomDataset(200, (2,2)), multiprocessing_context="fork",
num_workers=1, persistent_workers=True):
random_t.max(dim=0)
keep_fds_alive.append(random_t)
except RuntimeError as e:
assert "ulimit -n" in str(e)
assert "set_sharing_strategy" in str(e)
"""])
def test_dataset_not_reset(self):
dataset = DummyDataset()
pin_memory_configs = [False]
if TEST_NPU:
pin_memory_configs.append(True)
for pin_memory in pin_memory_configs:
dataloader = self._get_data_loader(dataset, num_workers=2, pin_memory=pin_memory)
dataset.start = 0
for i in range(10):
for x in dataloader:
pass
dataset.start = i
@unittest.skipIf(IS_SANDCASTLE, "subprocess doesn't work in FB internal CI")
@unittest.skipIf(IS_WINDOWS, "Needs fork")
def test_early_exit(self):
import subprocess
proc = subprocess.check_output([sys.executable, '-c', """\
import torch
from torch.utils.data import DataLoader, IterableDataset
class RandomDataset(IterableDataset):
def __init__(self, len, size):
super(RandomDataset).__init__()
self.len = len
self.size = size
def __iter__(self):
return self
def __next__(self):
if self.len <= 0:
raise StopIteration
self.len -= 1
return torch.randn(self.size)
if __name__ == '__main__':
dl = DataLoader(
RandomDataset(64, (28, 28)),
batch_size=16,
num_workers=2,
pin_memory=True,
persistent_workers=True,
multiprocessing_context="fork",
)
for _ in dl:
break
"""])
class NamedTupleDataset(Dataset):
from collections import namedtuple
Batch = namedtuple('Batch', ['data', 'label', 'random_tensor'])
Data = namedtuple('Data', ['positive', 'negative'])
def __len__(self):
return 4
def __getitem__(self, ndx):
return self.Batch(data=self.Data(positive=ndx, negative=-ndx),
label=str(ndx), random_tensor=torch.randn(3))
@unittest.skipIf(
TEST_WITH_TSAN,
"Fails with TSAN with the following error: starting new threads after multi-threaded "
"fork is not supported. Dying (set die_after_fork=0 to override)")
class TestNamedTupleDataLoader(TestCase):
def setUp(self):
super().setUp()
self.dataset = NamedTupleDataset()
def test_dataloader_with_namedtuple(self):
loader = DataLoader(self.dataset, batch_size=2, pin_memory=TEST_NPU, pin_memory_device='npu')
for batch in loader:
self.assertIsInstance(batch, NamedTupleDataset.Batch)
self.assertEqual(batch.random_tensor.is_pinned(), TEST_NPU)
self.assertIsInstance(batch.data, NamedTupleDataset.Data)
self.assertIsInstance(batch.data.positive, torch.Tensor)
self.assertEqual(batch.data.positive.is_pinned(), TEST_NPU)
loader = DataLoader(self.dataset, batch_size=None, pin_memory=TEST_NPU, pin_memory_device='npu')
for batch in loader:
self.assertIsInstance(batch, NamedTupleDataset.Batch)
self.assertEqual(batch.random_tensor.is_pinned(), TEST_NPU)
self.assertIsInstance(batch.data, NamedTupleDataset.Data)
self.assertNotIsInstance(batch.data.positive, torch.Tensor)
class SimpleCustomBatch:
def __init__(self, data):
transposed_data = list(zip(*data))
self.inp = torch.stack(transposed_data[0], 0)
self.tgt = torch.stack(transposed_data[1], 0)
def pin_memory(self):
self.inp = self.inp.pin_memory()
self.tgt = self.tgt.pin_memory()
return self
def is_pinned(self):
return self.inp.is_pinned() and self.tgt.is_pinned()
self_module = __import__(os.path.splitext(os.path.basename(__file__))[0])
def collate_wrapper(batch):
return self_module.SimpleCustomBatch(batch)
def collate_into_packed_sequence(batch):
data = torch.stack([sample[0] for sample in batch], 1)
t, b = data.size()
lengths = torch.randint(1, t, size=(b,), dtype=torch.int64)
return torch.nn.utils.rnn.pack_padded_sequence(data, lengths, enforce_sorted=False)
def collate_into_packed_sequence_batch_first(batch):
data = torch.stack([sample[0] for sample in batch], 0)
b, t = data.size()
lengths = torch.randint(1, t, size=(b,), dtype=torch.int64)
return torch.nn.utils.rnn.pack_padded_sequence(data, lengths, batch_first=True, enforce_sorted=False)
@unittest.skipIf(
TEST_WITH_TSAN,
"Fails with TSAN with the following error: starting new threads after multi-threaded "
"fork is not supported. Dying (set die_after_fork=0 to override)")
class TestCustomPinFn(TestCase):
def setUp(self):
super().setUp()
inps = torch.arange(10 * 5, dtype=torch.float32).view(10, 5)
tgts = torch.arange(10 * 5, dtype=torch.float32).view(10, 5)
self.dataset = TensorDataset(inps, tgts)
@unittest.skipIf(not TEST_NPU, "NPU unavailable")
def test_custom_batch_pin(self):
test_cases = [
(collate_wrapper, self_module.SimpleCustomBatch),
(collate_into_packed_sequence, torch.nn.utils.rnn.PackedSequence),
(collate_into_packed_sequence_batch_first, torch.nn.utils.rnn.PackedSequence),
]
for collate_fn, elem_cls in test_cases:
loader = DataLoader(self.dataset, batch_size=2, collate_fn=collate_fn,
pin_memory=True, pin_memory_device='npu')
for sample in loader:
self.assertIsInstance(sample, elem_cls)
self.assertTrue(sample.is_pinned())
@unittest.skipIf(not TEST_NPU, "NPU unavailable")
def test_custom_batch_pin_worker(self):
test_cases = [
(collate_wrapper, self_module.SimpleCustomBatch),
(collate_into_packed_sequence, torch.nn.utils.rnn.PackedSequence),
(collate_into_packed_sequence_batch_first, torch.nn.utils.rnn.PackedSequence),
]
for collate_fn, elem_cls in test_cases:
loader = DataLoader(self.dataset, batch_size=2, collate_fn=collate_fn,
pin_memory=True, num_workers=1, pin_memory_device='npu')
for sample in loader:
self.assertIsInstance(sample, elem_cls)
self.assertTrue(sample.is_pinned())
class TestWorkerQueueDataset(Dataset):
def __init__(self, data):
self.data = data
self.worker_id = None
def worker_init_fn(self, worker_id):
self.worker_id = worker_id
def __getitem__(self, item):
return self.worker_id, self.data[item]
def __len__(self):
return len(self.data)
@unittest.skipIf(
TEST_WITH_TSAN,
"Fails with TSAN with the following error: starting new threads after multi-threaded "
"fork is not supported. Dying (set die_after_fork=0 to override)")
@unittest.skipIf(
TEST_WITH_ASAN,
"Flaky with ASAN, see pytorch issue 65727")
class TestIndividualWorkerQueue(TestCase):
def setUp(self):
super().setUp()
self.dataset = TestWorkerQueueDataset(list(range(128)))
def _run_ind_worker_queue_test(self, batch_size, num_workers):
loader = DataLoader(
self.dataset, batch_size=batch_size, shuffle=False, num_workers=num_workers,
timeout=5, worker_init_fn=self.dataset.worker_init_fn
)
current_worker_idx = 0
for i, (worker_ids, sample) in enumerate(loader):
self.assertEqual(worker_ids.tolist(), [current_worker_idx] * batch_size)
self.assertEqual(sample.tolist(), list(range(i * batch_size, (i + 1) * batch_size)))
current_worker_idx += 1
if current_worker_idx == num_workers:
current_worker_idx = 0
def test_ind_worker_queue(self):
max_num_workers = None
if hasattr(os, 'sched_getaffinity'):
try:
max_num_workers = len(os.sched_getaffinity(0))
except Exception:
pass
if max_num_workers is None:
cpu_count = os.cpu_count()
if cpu_count is not None:
max_num_workers = cpu_count // 2
if max_num_workers is None:
max_num_workers = 1
for batch_size in (8, 16, 32, 64):
for num_workers in range(0, min(6, max_num_workers)):
self._run_ind_worker_queue_test(batch_size=batch_size, num_workers=num_workers + 1)
class SetAffinityDataset(IterableDataset):
def __iter__(self):
torch.randperm(1)
after = os.sched_getaffinity(0)
return iter(after)
@unittest.skipIf(
not hasattr(os, 'sched_setaffinity'),
"os.sched_setaffinity is not available")
class TestSetAffinity(TestCase):
def test_set_affinity_in_worker_init(self):
old_affinity = os.sched_getaffinity(0)
if not old_affinity:
self.skipTest("No affinity information")
expected_affinity = list(old_affinity)[-1]
def worker_set_affinity(_):
os.sched_setaffinity(0, [expected_affinity])
dataset = SetAffinityDataset()
dataloader = torch.utils.data.DataLoader(
dataset, num_workers=2, worker_init_fn=worker_set_affinity)
for sample in dataloader:
self.assertEqual(sample, [expected_affinity])
class ConvDataset(Dataset):
def __init__(self):
self.x = torch.ones(1, 1, 24000)
self[0]
def __len__(self):
return 1
def __getitem__(self, index):
return torch.nn.functional.conv1d(self.x, torch.ones(1, 1, 2))
@unittest.skipIf(IS_WINDOWS, "Needs fork")
@unittest.skipIf(
TEST_WITH_ASAN,
"This test hangs when running with ASAN, see torch pytorch issue 75492")
class TestConvAfterFork(TestCase):
def test_conv_after_fork(self):
loader = DataLoader(ConvDataset(), num_workers=1)
for x in loader:
self.assertEqual(x.shape, (1, 1, 1, 23999))
if __name__ == '__main__':
run_tests()