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# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
import torch
from torch import nn
from torch.autograd import Function
from torch.autograd.function import once_differentiable
from torch.nn.modules.utils import _pair
from maskrcnn_benchmark import _C
class _ROIPool(Function):
@staticmethod
def forward(ctx, input, roi, output_size, spatial_scale):
ctx.output_size = _pair(output_size)
ctx.spatial_scale = spatial_scale
ctx.input_shape = input.size()
output, argmax = _C.roi_pool_forward(
input, roi, spatial_scale, output_size[0], output_size[1]
)
ctx.save_for_backward(input, roi, argmax)
return output
@staticmethod
@once_differentiable
def backward(ctx, grad_output):
input, rois, argmax = ctx.saved_tensors
output_size = ctx.output_size
spatial_scale = ctx.spatial_scale
bs, ch, h, w = ctx.input_shape
grad_input = _C.roi_pool_backward(
grad_output,
input,
rois,
argmax,
spatial_scale,
output_size[0],
output_size[1],
bs,
ch,
h,
w,
)
return grad_input, None, None, None
roi_pool = _ROIPool.apply
class ROIPool(nn.Module):
def __init__(self, output_size, spatial_scale):
super(ROIPool, self).__init__()
self.output_size = output_size
self.spatial_scale = spatial_scale
def forward(self, input, rois):
return roi_pool(input, rois, self.output_size, self.spatial_scale)
def __repr__(self):
tmpstr = self.__class__.__name__ + "("
tmpstr += "output_size=" + str(self.output_size)
tmpstr += ", spatial_scale=" + str(self.spatial_scale)
tmpstr += ")"
return tmpstr
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