Atanh

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Contribution Description

Contributor	Contributed Operator	Contribution Date	Contribution Content
CANN-BOT SIMT	atanh	2026/05/22	Added the atanh operator

Product Support Status

Product	Supported
Ascend 950PR&950DT products	√
Atlas A3 products	√
Atlas A2 products	√
Atlas 200I/500 A2 inference products	√
Atlas inference products	√
Atlas training products	√

Function Description

• Operator function: computes the inverse hyperbolic tangent.

• Computation formula:

$$y=\text{atanh}(x)=\frac{1}{2}\ln \left(\frac{1+x}{1-x}\right)$$

Parameter Description

Parameter Name	Input/Output/Attribute	Description	Data Type	Data Format
x	Input	Input parameter for the atanh computation, which is x in the formula. The input value range is (-1, 1).	FLOAT16, FLOAT, BF16	ND
y	Output	Result of the atanh computation, which is y in the formula.	FLOAT16, FLOAT, BF16	ND

Constraint Description

• The value range of the input x is (-1, 1). If |x|>1, NaN is output; if x=±1, ±Inf is output.
• The output shape is identical to the input shape.
• The output dtype is identical to the input dtype.

Invocation Description

Invocation Method	Invocation Sample	Description
aclnn invocation	test_aclnn_atanh	Refer to Operator Invocation to complete operator compilation and verification.
Graph-mode invocation	test_geir_atanh	Refer to Operator Invocation to complete operator compilation and verification.