openvino/docs/ops/movement/ReverseSequence_1.md

ReverseSequence

Versioned name: ReverseSequence-1

Category: Data movement

Short description: ReverseSequence reverses variable length slices of data.

Detailed description

ReverseSequence slices a given input tensor data along the dimension specified in the batch_axis attribute. For each slice i, it reverses the first seq_lengths[i] elements along the dimension specified in the seq_axis attribute.

Attributes

• batch_axis

  • Description: batch_axis is the index of the batch dimension along which data input tensor is sliced.
  • Range of values: an integer within the range [-rank(data), rank(data) - 1]
  • Type: int
  • Default value: 0
  • Required: no

• seq_axis

  • Description: seq_axis is the index of the sequence dimension along which elements of data input tensor are reversed.
  • Range of values: an integer within the range [-rank(data), rank(data) - 1]
  • Type: int
  • Default value: 1
  • Required: no

Inputs

• 1: data - Input data to reverse. A tensor of type T1 and rank greater or equal to 2. Required.
• 2: seq_lengths - Sequence lengths to reverse in the input tensor data. A 1D tensor comprising data_shape[batch_axis] elements of type T2. All element values must be integer values within the range [1, data_shape[seq_axis]]. Value 1 means, no elements are reversed. Required.

Outputs

• 1: The result of slice and reverse data input tensor. A tensor of type T1 and the same shape as data input tensor.

Types

• T1: any supported type.
• T2: any supported numerical type.

Example

<layer ... type="ReverseSequence">
    <data batch_axis="0" seq_axis="1"/>
    <input>
        <port id="0">       <!-- data -->
            <dim>4</dim>    <!-- batch_axis -->
            <dim>10</dim>   <!-- seq_axis -->
            <dim>100</dim>
            <dim>200</dim>
        </port>
        <port id="1">
            <dim>4</dim>    <!-- seq_lengths value: [2, 4, 8, 10] -->
        </port>
     </input>
    <output>
        <port id="2">
            <dim>4</dim>
            <dim>10</dim>
            <dim>100</dim>
            <dim>200</dim>
        </port>
    </output>
</layer>