.. index:: pair: page; Reciprocal
.. _doxid-dev_guide_op_reciprocal:

Reciprocal
==========

General
~~~~~~~

Reciprocal operation is element-wise Power operation where exponent(power) equals to -1. Reciprocal of 0 is infinity.

.. math::

	dst = \begin{cases} src^{-1} & \text{if}\ src \neq 0 \\ inf & \text{if}\ src = 0 \end{cases}

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

Reciprocal 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   Argument Name   Required or Optional   
======  ==============  =====================  
0       ``src``         Required               
======  ==============  =====================

Outputs
-------

======  ==============  =====================  
Index   Argument Name   Required or Optional   
======  ==============  =====================  
0       ``dst``         Required               
======  ==============  =====================

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

Reciprocal operation supports the following data type combinations.

=====  =====  
Src    Dst    
=====  =====  
f32    f32    
bf16   bf16   
f16    f16    
=====  =====

Implementation Notes
~~~~~~~~~~~~~~~~~~~~

Reciprocal supports in-place operations, meaning that ``src`` can be used as both input and output (``dst``). In case of in-place operation, the original ``src`` data will be overwritten. Use in-place operations whenever possible for performance.