(l-onnx-doc-Celu)=

# Celu


(l-onnx-op-celu-12)=

## Celu - 12

### Version

- **name**: [Celu (GitHub)](https://github.com/onnx/onnx/blob/main/docs/Operators.md#Celu)
- **domain**: `main`
- **since_version**: `12`
- **function**: `True`
- **support_level**: `SupportType.COMMON`
- **shape inference**: `True`

This version of the operator has been available
**since version 12**.

### Summary

Continuously Differentiable Exponential Linear Units:
Perform the linear unit element-wise on the input tensor X
using formula:

```
max(0,x) + min(0,alpha*(exp(x/alpha)-1))
```

### Attributes

* **alpha - FLOAT** (default is `'1.0'`):

  The Alpha value in Celu formula which control the shape of the unit. The default value is 1.0.

### Inputs

- **X** (heterogeneous) - **T**:

  Input tensor

### Outputs

- **Y** (heterogeneous) - **T**:

  Output tensor

### Type Constraints

* **T** in ( `tensor(float)` ):

  Constrain input and output types to float32 tensors.