.. index:: pair: page; TanhBackward .. _doxid-dev_guide_op_tanhbackward: TanhBackward ============ General ~~~~~~~ TanhBackward operation computes gradient for Tanh. Operation attributes ~~~~~~~~~~~~~~~~~~~~ ==================================================================================================================== =========================================================================================== =========== ============================== ===================== Attribute Name Description Value Type Supported Values Required or Optional ==================================================================================================================== =========================================================================================== =========== ============================== ===================== :ref:`use_dst ` If true, use ``dst`` of Tanh operation to calculate the gradient. Otherwise, use ``src`` . bool ``true`` (default), ``false`` Optional ==================================================================================================================== =========================================================================================== =========== ============================== ===================== Execution arguments ~~~~~~~~~~~~~~~~~~~ The inputs and outputs must be provided according to below index order when constructing an operation. Inputs ------ ====== ================== ===================== Index Argument Name Required or Optional ====== ================== ===================== 0 ``src`` / ``dst`` Required 1 ``diff_dst`` Required ====== ================== ===================== Outputs ------- ====== ============== ===================== Index Argument Name Required or Optional ====== ============== ===================== 0 ``diff_src`` Required ====== ============== ===================== Supported data types ~~~~~~~~~~~~~~~~~~~~ TanhBackward operation supports the following data type combinations. ========== ========= ========= Src / Dst Diff_dst Diff_src ========== ========= ========= f32 f32 f32 f16 f16 f16 bf16 bf16 bf16 ========== ========= ========= Implementation Notes ~~~~~~~~~~~~~~~~~~~~ TanhBackward supports in-place operations, meaning that ``diff_dst`` can be used as both input and output (``diff_src``). In case of in-place operation, the original ``diff_dst`` data will be overwritten. Use in-place operations whenever possible for performance.