class_docstr: RoI pooling over a set of 2d planes.
class_docstr_tok: ["RoI","pooling","over","a","set","of","2d","planes","."]
code: def __init__(self, outh, outw, spatial_scale):
      self.outh, self.outw = outh, outw
      self.spatial_scale = spatial_scale
  
imports: import numpy
  import six
  from chainer.backends import cuda
  from chainer import function_node
  from chainer.utils import type_check
label_desc: Use image node_id 1 to create a new ROIPooling2D object from inherited base classes: function_node with example: obj = ROIPooling2D(outh, outw, spatial_scale)