AbsBackward {#dev_guide_op_absbackward}
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## General

AbsBackward operation computes gradient for Abs operation.

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

## 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 | Argument Name | Required or Optional |
|:------|:--------------|:---------------------|
| 0     | `src`         | Required             |
| 1     | `diff_dst`    | Required             |

### Outputs

| Index | Argument Name | Required or Optional |
|:----- |:--------------|:---------------------|
| 0     | `diff_src`    | Required             |

## Supported data types

AbsBackward operation supports the following data type combinations.

| Src  | Diff_dst | Diff_src |
|:-----|:---------|:---------|
| f32  | f32      | f32      |
| f16  | f16      | f16      |
| bf16 | bf16     | bf16     |