DeformablePSROIPooling

Versioned name: DeformablePSROIPooling-1

Category: Object detection

Short description: DeformablePSROIPooling computes position-sensitive pooling on regions of interest specified by input.

Detailed description: Reference.

DeformablePSROIPooling operation takes two or three input tensors: with feature maps, with regions of interests (box coordinates) and an optional tensor with transformation values. The box coordinates are specified as five element tuples: [batch_id, x_1, y_1, x_2, y_2] in absolute values.

Attributes

• output_dim
  • Description: output_dim is a pooled output channel number.
  • Range of values: a positive integer
  • Type: int
  • Default value: None
  • Required: yes
• group_size
  • Description: group_size is the number of groups to encode position-sensitive score maps.
  • Range of values: a positive integer
  • Type: int
  • Default value: 1
  • Required: no
• spatial_scale
  • Description: spatial_scale is a multiplicative spatial scale factor to translate ROI coordinates from their input scale to the scale used when pooling.
  • Range of values: a positive floating-point number
  • Type: float
  • Default value: None
  • Required: yes
• mode
  • Description: mode specifies mode for pooling.
  • Range of values:
    • bilinear_deformable - perform pooling with bilinear interpolation and deformable transformation
  • Type: string
  • Default value: bilinear_deformable
  • Required: no
• spatial_bins_x
  • Description: spatial_bins_x specifies numbers of bins to divide the input feature maps over width.
  • Range of values: a positive integer
  • Type: int
  • Default value: 1
  • Required: no
• spatial_bins_y
  • Description: spatial_bins_y specifies numbers of bins to divide the input feature maps over height.
  • Range of values: a positive integer
  • Type: int
  • Default value: 1
  • Required: no
• trans_std
  • Description: trans_std is the value that all transformation (offset) values are multiplied with.
  • Range of values: floating point number
  • Type: float
  • Default value: 1
  • Required: no
• part_size
  • Description: part_size is the number of parts the output tensor spatial dimensions are divided into. Basically it is the height and width of the third input with transformation values.
  • Range of values: positive integer number
  • Type: int
  • Default value: 1
  • Required: no

Inputs:

• 1: 4D input tensor with feature maps. Required.
• 2: 2D input tensor describing box consisting of five element tuples: [batch_id, x_1, y_1, x_2, y_2]. Required.
• 3: 4D input blob with transformation values (offsets). Optional.

Outputs:

• 1: 4D output tensor with areas copied and interpolated from the 1st input tensor by coordinates of boxes from the 2nd input and transformed according to values from the 3rd input.

Example

<layer ... type="DeformablePSROIPooling" ... >
    <data group_size="7" mode="bilinear_deformable" no_trans="False" output_dim="8" part_size="7" pooled_height="7" pooled_width="7" spatial_bins_x="4" spatial_bins_y="4" spatial_scale="0.0625" trans_std="0.1"/>
    <input>
        <port id="0">
            <dim>1</dim>
            <dim>392</dim>
            <dim>38</dim>
            <dim>63</dim>
        </port>
        <port id="1">
            <dim>300</dim>
            <dim>5</dim>
        </port>
        <port id="2">
            <dim>300</dim>
            <dim>2</dim>
            <dim>7</dim>
            <dim>7</dim>
        </port>
    </input>
    <output>
        <port id="3" precision="FP32">
            <dim>300</dim>
            <dim>8</dim>
            <dim>7</dim>
            <dim>7</dim>
        </port>
    </output>
</layer>