.. SPDX-FileCopyrightText: 2020-2021 Intel Corporation
..
.. SPDX-License-Identifier: CC-BY-4.0

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EluBackprop
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**Versioned name**: *EluBackprop-1*

**Category**: *Activation*

**Short description**: *EluBackprop* computes gradient for ELU.

**Attributes**:

* *alpha*

  * **Description**: *alpha* is scale for the negative factor.
  * **Range of values**: arbitrary non-negative f32 value
  * **Type**: f32
  * **Required**: *yes*

* *use_dst*

  * **Description**: If true, use *dst* to calculate gradient; else use *src*.
  * **Range of values**: True or False
  * **Type**: bool
  * **Default value**: True
  * **Required**: *no*

**Inputs**:

* **1**:  ``result_forward`` / ``input_forward`` - if *use_dst* is true,
  ``result_forward`` is used, else ``input_forward`` is used.. **Required.**

  * **Type**: T

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

  * **Type**: T

**Outputs**

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

  * **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.