StridedSlice

Versioned name: StridedSlice-1

Category: Data movement operation

Short description: StridedSlice extracts a strided slice of a tensor. It is similar to generalized array indexing in Python*.

Attributes

• begin_mask

  • Description: begin_mask is a bit mask. begin_mask[i] equal to 1 means that the corresponding dimension of the begin input is ignored and the 'real' beginning of the tensor is used along corresponding dimension.
  • Range of values: a list of 0s and 1s
  • Type: int[]
  • Default value: None
  • Required: yes

• end_mask

  • Description: end_mask is a bit mask. If end_mask[i] is 1, the corresponding dimension of the end input is ignored and the real 'end' of the tensor is used along corresponding dimension.
  • Range of values: a list of 0s and 1s
  • Type: int[]
  • Default value: None
  • Required: yes

• new_axis_mask

  • Description: new_axis_mask is a bit mask. If new_axis_mask[i] is 1, a length 1 dimension is inserted on the i-th position of input tensor.
  • Range of values: a list of 0s and 1s
  • Type: int[]
  • Default value: [0]
  • Required: no

• shrink_axis_mask

  • Description: shrink_axis_mask is a bit mask. If shrink_axis_mask[i] is 1, the dimension on the i-th position is deleted.
  • Range of values: a list of 0s and 1s
  • Type: int[]
  • Default value: [0]
  • Required: no

• ellipsis_mask

  • Description: ellipsis_mask is a bit mask. It inserts missing dimensions on a position of a non-zero bit.
  • Range of values: a list of 0s and 1. Only one non-zero bit is allowed.
  • Type: int[]
  • Default value: [0]
  • Required: no

Inputs:

• 1: Multidimensional input tensor to be sliced. Required.

• 2: begin input - 1D input tensor with begin indexes for input tensor slicing. Required. Out-of-bounds values are silently clamped. If begin_mask[i] is 1, the value of begin[i] is ignored and the range of the appropriate dimension starts from 0. Negative values mean indexing starts from the end. For example, if foo=[1,2,3], begin[0]=-1 means begin[0]=3.

• 3: end input - 1D input tensor with end indexes for input tensor slicing. Required. Out-of-bounds values will be silently clamped. If end_mask[i] is 1, the value of end[i] is ignored and the full range of the appropriate dimension is used instead. Negative values mean indexing starts from the end. For example, if foo=[1,2,3], end[0]=-1 means end[0]=3.

• 4: stride input - 1D input tensor with strides. Optional.

Example

<layer ... type="StridedSlice" ...>
    <data begin_mask="1,0,1,1,1" ellipsis_mask="0,0,0,0,0" end_mask="1,0,1,1,1" new_axis_mask="0,0,0,0,0" shrink_axis_mask="0,1,0,0,0"/>
    <input>
        <port id="0">
            <dim>1</dim>
            <dim>2</dim>
            <dim>384</dim>
            <dim>640</dim>
            <dim>8</dim>
        </port>
        <port id="1">
            <dim>5</dim>
        </port>
        <port id="2">
            <dim>5</dim>
        </port>
        <port id="3">
            <dim>5</dim>
        </port>
    </input>
    <output>
        <port id="4">
            <dim>1</dim>
            <dim>384</dim>
            <dim>640</dim>
            <dim>8</dim>
        </port>
    </output>
</layer>