变更摘要

本次变更针对 TopkCommon 缺乏 rank 防护的问题：在 math/topk/op_api/topk.cpp 的 TopkCommon 入口新增 rank-0 防御性校验。当 self 的维度数为 0（超出文档声明的 1–8 维支持范围）时，记录参数错误日志并直接返回空结果，从而在后续 GetDim(dimNum - 1) 负索引越界读、SetDim(dim, k) 越界写以及 tiling 失败后内核仍被下发导致设备侧异常之前完成拦截。rank≥1 的各条路径行为保持不变。

主要改动

• 新增 rank 入口校验：在 TopkCommon 起始处通过 self->GetViewShape().GetDimNum() == 0 判断，将 rank-0 标量输入前置拦截，避免负索引越界与矛盾元数据下发。
• 返回参数错误并输出日志：以 OP_LOGE(ACLNN_ERR_PARAM_INVALID, ...) 记录可诊断的参数错误信息，明确 TopK 输入张量 rank 需在 [1, 8] 范围内。
• 失败时返回空结果：校验不通过时返回 std::tuple<aclTensor*, aclTensor*>(nullptr, nullptr)，使调用方在构造输出形状之前即终止，不再进入后续 outShape.SetDim(dim, k) 等处理流程。

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