.. index:: pair: page; AbsBackward
.. _doxid-dev_guide_op_absbackward:

AbsBackward
===========

General
~~~~~~~

AbsBackward operation computes gradient for Abs operation.

.. math::

	dst = \begin{cases} diff\_dst & \text{if}\ src > 0 \\ -diff\_dst & \text{if}\ src < 0 \\ 0 & \text{if}\ src = 0 \\ \end{cases}

Operation attributes
~~~~~~~~~~~~~~~~~~~~

AbsBackward operation does not support any attribute.

Execution arguments
~~~~~~~~~~~~~~~~~~~

The inputs and outputs must be provided according to below index order when constructing an operation.

Inputs
------

======  =============  =========  
Index   Argu           
======  =============  =========  
0       ``src``        Required   
1       ``diff_dst``   Required   
======  =============  =========

Outputs
-------

======  =============  =========  
Index   Argu           
======  =============  =========  
0       ``diff_src``   Required   
======  =============  =========

Supported data types
~~~~~~~~~~~~~~~~~~~~

AbsBackward operation supports the following data type combinations.

=====  =======  =====  
Src    Diff_d   
=====  =======  =====  
f32    f32      f32    
f16    f16      f16    
bf16   bf16     bf16   
=====  =======  =====