.. index:: pair: page; BiasAddBackward .. _doxid-dev_guide_op_biasaddbackward: BiasAddBackward =============== General ~~~~~~~ BiasAddBackward operation computes the gradients on the bias tensor for BiasAdd operator. This op accumulates all the values from :math:`\diffdst` into the channel dimension, the axis depends on the layout of :math:`\src` tensor. Operation attributes ~~~~~~~~~~~~~~~~~~~~ ======================================================================================================================== ======================================================================== =========== ============================ ===================== Attribute Name Description Value Type Supported Values Required or Optional ======================================================================================================================== ======================================================================== =========== ============================ ===================== :ref:`data_format ` Controls how to interpret the shape of ``diff_dst`` and ``diff_bias`` . string ``NCX`` , ``NXC`` (default) 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 ``diff_dst`` Required ====== ============== ===================== Outputs ------- ====== ============== ===================== Index Argument Name Required or Optional ====== ============== ===================== 0 ``diff_bias`` Required ====== ============== ===================== Supported data types ~~~~~~~~~~~~~~~~~~~~ BiasAddBackward operation supports the following data type combinations. ========= ========== Diff_dst Diff_bias ========= ========== f32 f32 bf16 bf16 f16 f16 ========= ==========