:nosearch:

.. _op_ai_onnx_Selu-6:

Selu - version 6
================

This page documents version **6** of operator **Selu**. See :doc:`Selu` for the latest version (since version 22).

- **Domain**: ``ai.onnx``
- **Since version**: 6

Selu takes one input data (Tensor ) and produces one output data
(Tensor ) where the scaled exponential linear unit function,
``y = gamma * (alpha * e^x - alpha) for x   0``,
is applied to the tensor elementwise.

**Inputs**

- **X** (*T*): Input tensor

**Outputs**

- **Y** (*T*): Output tensor

**Attributes**

- **alpha** (*float*): Coefficient of SELU default to 1.67326319217681884765625 (i.e., float32 approximation of 1.6732632423543772848170429916717).
- **gamma** (*float*): Coefficient of SELU default to 1.05070102214813232421875 (i.e., float32 approximation of 1.0507009873554804934193349852946).

**Type Constraints**

- **T**: Constrain input and output types to float tensors.
  Allowed types: tensor(double), tensor(float), tensor(float16).

Examples
--------

**test_cc_selu**

.. code-block:: text

    Node:
      Selu(X) -> (Y)
      Attributes:
        alpha = 2.0
        gamma = 3.0

.. code-block:: text

    Inputs:
      X: shape=(2, 3), dtype=float32
        [[-2. , -1. , -0.5],
         [ 0.5,  1. ,  2. ]]

    Outputs:
      Y: shape=(2, 3), dtype=float32
        [[-5.1879883, -3.7927232, -2.360816 ],
         [ 1.5      ,  3.       ,  6.       ]]

**test_cc_selu_default**

.. code-block:: text

    Node:
      Selu(X) -> (Y)

.. code-block:: text

    Inputs:
      X: shape=(2, 3), dtype=float32
        [[-2. , -1. , -0.5],
         [ 0.5,  1. ,  2. ]]

    Outputs:
      Y: shape=(2, 3), dtype=float32
        [[-1.5201665, -1.1113306, -0.6917582],
         [ 0.5253505,  1.050701 ,  2.101402 ]]

**test_cc_selu_example**

.. code-block:: text

    Node:
      Selu(X) -> (Y)
      Attributes:
        alpha = 2.0
        gamma = 3.0

.. code-block:: text

    Inputs:
      X: shape=(3,), dtype=float32
        [-1.,  0.,  1.]

    Outputs:
      Y: shape=(3,), dtype=float32
        [-3.7927232,  0.       ,  3.       ]

Differences with previous version (1)
-------------------------------------

**SchemaDiff**: ``Selu`` (domain ``'ai.onnx'``)

* old version: 1
* new version: 6
* breaking: **yes**

**Breaking reasons:**

* attribute 'alpha' (changed): default value changed 1.6732 -> 1.67326

**Attributes:**

* [BREAKING] changed 'alpha': default value changed 1.6732 -> 1.67326