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.. _op_ai_onnx_Identity-13:

Identity - version 13
=====================

This page documents version **13** of operator **Identity**. See :doc:`Identity` for the latest version (since version 25).

- **Domain**: ``ai.onnx``
- **Since version**: 13

Identity operator

**Inputs**

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

**Outputs**

- **output** (*T*): Tensor to copy input into.

**Type Constraints**

- **T**: Constrain input and output types to all tensor types.
  Allowed types: tensor(bfloat16), tensor(bool), tensor(complex128), tensor(complex64), tensor(double), tensor(float), tensor(float16), tensor(int16), tensor(int32), tensor(int64), tensor(int8), tensor(string), tensor(uint16), tensor(uint32), tensor(uint64), tensor(uint8).

Examples
--------

**test_cc_identity**

.. code-block:: text

    Node:
      Identity(x) -> (y)

.. code-block:: text

    Inputs:
      x: shape=(1, 3, 2, 2), dtype=float32
        [[[[ 1.,  2.],
           [ 3.,  4.]],
        
          [[ 5.,  6.],
           [ 7.,  8.]],
        
          [[ 9., 10.],
           [11., 12.]]]]

    Outputs:
      y: shape=(1, 3, 2, 2), dtype=float32
        [[[[ 1.,  2.],
           [ 3.,  4.]],
        
          [[ 5.,  6.],
           [ 7.,  8.]],
        
          [[ 9., 10.],
           [11., 12.]]]]

**test_cc_identity_int64**

.. code-block:: text

    Node:
      Identity(x) -> (y)

.. code-block:: text

    Inputs:
      x: shape=(2, 3), dtype=int64
        [[1, 2, 3],
         [4, 5, 6]]

    Outputs:
      y: shape=(2, 3), dtype=int64
        [[1, 2, 3],
         [4, 5, 6]]

**test_cc_identity_scalar**

.. code-block:: text

    Node:
      Identity(x) -> (y)

.. code-block:: text

    Inputs:
      x: shape=(), dtype=float32
        42.

    Outputs:
      y: shape=(), dtype=float32
        42.

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

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

* old version: 1
* new version: 13
* breaking: no

**Type constraints:**

* changed 'T': added types: ['tensor(bfloat16)']