# tf.raw_ops.UniqueV2

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Finds unique elements along an axis of a tensor.

#### View aliases


**Compat aliases for migration**

See
[Migration guide](https://www.tensorflow.org/guide/migrate) for
more details.

[`tf.compat.v1.raw_ops.UniqueV2`](https://www.tensorflow.org/api_docs/python/tf/raw_ops/UniqueV2)

<br />

    tf.raw_ops.UniqueV2(
        x,
        axis,
        out_idx=https://www.tensorflow.org/versions/r2.13/api_docs/python/tf/dtypes#int32,
        name=None
    )

This operation either returns a tensor `y` containing unique elements
along the `axis` of a tensor. The returned unique elements is sorted
in the same order as they occur along `axis` in `x`.
This operation also returns a tensor `idx` that is the same size as
the number of the elements in `x` along the `axis` dimension. It
contains the index in the unique output `y`.
In other words, for an `1-D` tensor `x` with \`axis = None:

`y[idx[i]] = x[i] for i in [0, 1,...,rank(x) - 1]`

#### For example:

    # tensor 'x' is [1, 1, 2, 4, 4, 4, 7, 8, 8]
    y, idx = unique(x)
    y ==> [1, 2, 4, 7, 8]
    idx ==> [0, 0, 1, 2, 2, 2, 3, 4, 4]

For an `2-D` tensor `x` with `axis = 0`:

    # tensor 'x' is [[1, 0, 0],
    #                [1, 0, 0],
    #                [2, 0, 0]]
    y, idx = unique(x, axis=0)
    y ==> [[1, 0, 0],
           [2, 0, 0]]
    idx ==> [0, 0, 1]

For an `2-D` tensor `x` with `axis = 1`:

    # tensor 'x' is [[1, 0, 0],
    #                [1, 0, 0],
    #                [2, 0, 0]]
    y, idx = unique(x, axis=1)
    y ==> [[1, 0],
           [1, 0],
           [2, 0]]
    idx ==> [0, 1, 1]

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| ## Args ||
|---|---|
| `x` | A `Tensor`. A `Tensor`. |
| `axis` | A `Tensor`. Must be one of the following types: `int32`, `int64`. A `Tensor` of type `int32` (default: None). The axis of the Tensor to find the unique elements. |
| `out_idx` | An optional [`tf.DType`](https://www.tensorflow.org/versions/r2.13/api_docs/python/tf/dtypes/DType) from: `tf.int32, tf.int64`. Defaults to [`tf.int32`](https://www.tensorflow.org/versions/r2.13/api_docs/python/tf#int32). |
| `name` | A name for the operation (optional). |

<br />

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| ## Returns ||
|---|---|
| A tuple of `Tensor` objects (y, idx). ||
| `y` | A `Tensor`. Has the same type as `x`. |
| `idx` | A `Tensor` of type `out_idx`. |

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