ReverseSequence

Versioned name: ReverseSequence-1

Category: data movement operation

Short description: ReverseSequence reverses variable length slices of data.

Detailed description: ReverseSequence slices input along the dimension specified in the batch_axis, and for each slice i, reverses the first lengths[i] (the second input) elements along the dimension specified in the seq_axis.

Attributes

• batch_axis
  • Description: batch_axis is the index of the batch dimension.
  • Range of values: an integer. Can be negative.
  • Type: int
  • Default value: 0
  • Required: no
• seq_axis
  • Description: seq_axis is the index of the sequence dimension.
  • Range of values: an integer. Can be negative.
  • Type: int
  • Default value: 1
  • Required: no

Inputs:

• 1: tensor with input data to reverse. Required.
• 2: 1D tensor populated with integers with sequence lengths in the 1st input tensor. Required.

Example

<layer ... type="ReverseSequence">
    <data batch_axis="0" seq_axis="1"/>
    <input>
        <port id="0">
            <dim>3</dim>
            <dim>10</dim>
            <dim>100</dim>
            <dim>200</dim>
        </port>
        <port id="1">
            <dim>3</dim>
        </port>
     </input>
    <output>
        <port id="2">
            <dim>3</dim>
            <dim>10</dim>
            <dim>100</dim>
            <dim>200</dim>
        </port>
    </output>
</layer>