chainer.functions.roi_pooling_2d¶
-
chainer.functions.
roi_pooling_2d
(x, rois, outh, outw, spatial_scale)[source]¶ Spatial Region of Interest (ROI) pooling function.
This function acts similarly to
max_pooling_2d()
, but it computes the maximum of input spatial patch for each channel with the region of interest.- Parameters
x (Variable) – Input variable. The shape is expected to be 4 dimentional: (n: batch, c: channel, h, height, w: width).
rois (Variable) – Input roi variable. The shape is expected to be (n: data size, 5), and each datum is set as below: (batch_index, x_min, y_min, x_max, y_max).
outh (int) – Height of output image after pooled.
outw (int) – Width of output image after pooled.
spatial_scale (float) – Scale of the roi is resized.
- Returns
Output variable.
- Return type
See the original paper proposing ROIPooling: Fast R-CNN.