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 tensordata
. A 1D tensor comprisingdata_shape[batch_axis]
elements of type T2. All element values must be integer values within the range[1, data_shape[seq_axis]]
. Value1
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 asdata
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>