.. SPDX-FileCopyrightText: 2022 Intel Corporation
..
.. SPDX-License-Identifier: CC-BY-4.0

------------
MishBackprop
------------

**Versioned name**: *MishBackprop-1*

**Category**: *Activation*

**Short description**: *MishBackprop* computes gradient for Mish.

.. math::
   ds &= dd \cdot \frac{e^s \cdot \omega }{\delta ^2}, \text{where} \\
   \omega &= e^{3s} + 4 \cdot e^{2s} + e^s \cdot (4 \cdot s + 6) + 4 \cdot (s+1) \\
   \delta &= e^{2s} + 2 \cdot e^s + 2

**Attributes**: *MishBackprop* operation has no attributes.

**Inputs**:

* **1**:  ``input_forward`` - original input tensor of Mish op. **Required.**

  * **Type**: T

* **2**: ``output_delta`` - the gradient tensor with respect to the output.
  **Required.**

  * **Type**: T

**Outputs**

* **1**: ``input_delta`` - the gradient tensor with respect to the input of
  Mish.

  * **Type**: T
  
**Types**:

* **T**: f32, f16, bf16.
* **Note**: Inputs and outputs have the same data type denoted by *T*. For
  example, if input is f32 tensor, then all other tensors have f32 data type.