openvino/docs/ops/condition/NonZero_3.md

NonZero

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.. meta:: :description: Learn about NonZero-3 - an element-wise, condition operation, which can be performed on a single tensor in OpenVINO.

Versioned name: NonZero-3

Category: Condition

Short description: NonZero returns the indices of the non-zero elements of the input tensor.

Detailed description: NonZero returns the indices of the non-zero elements of the input tensor (in row-major order - by dimension).

• The output tensor has shape [rank(input), num_non_zero].
• For example, for the tensor [[1, 0], [1, 1]] the output will be [[0, 1, 1], [0, 0, 1]].
• The output is a collection of tuples, each tuple has rank(input) elements and contains indices for a single non-zero element.
• The i'th element of each output dimension is a part of i'th tuple.
• In given example the tuples would be: [0, 0], [1, 0], [1, 1].

Attributes

• output_type

  • Description: the output tensor type
  • Range of values: i64 or i32
  • Type: string
  • Default value: "i64"
  • Required: no

Inputs:

• 1: A tensor of type T and arbitrary shape. Required.

Outputs:

• 1: tensor with indices of non-zero elements of shape [rank(data), num_non_zero] of type T_OUT.

Types

• T: any type.

• T_OUT: Depending on output_type attribute can be int64 or int32.

Example

.. code-block:: xml :force:

<layer ... type="NonZero">
    <data output_type="i64"/>
    <input>
        <port id="0">
            <dim>3</dim>
            <dim>10</dim>
            <dim>100</dim>
            <dim>200</dim>
        </port>
    </input>
    <output>
        <port id="1">
            <dim>4</dim>
            <dim>-1</dim>
        </port>
    </output>
</layer>

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