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import torch
import math
from torch import nn
from torch.nn import init
from torch.nn.modules.utils import _pair
from torch.autograd import Function
from torch.autograd.function import once_differentiable
from maskrcnn_benchmark.utils.amp import custom_fwd, custom_bwd
from maskrcnn_benchmark import _C
class DeformConvFunction(Function):
@staticmethod
def forward(
ctx,
input,
offset,
weight,
stride=1,
padding=0,
dilation=1,
groups=1,
deformable_groups=1,
im2col_step=64
):
if input is not None and input.dim() != 4:
raise ValueError(
"Expected 4D tensor as input, got {}D tensor instead.".format(
input.dim()))
ctx.stride = _pair(stride)
ctx.padding = _pair(padding)
ctx.dilation = _pair(dilation)
ctx.groups = groups
ctx.deformable_groups = deformable_groups
ctx.im2col_step = im2col_step
ctx.save_for_backward(input, offset, weight)
output = input.new_empty(
DeformConvFunction._output_size(input, weight, ctx.padding,
ctx.dilation, ctx.stride))
ctx.bufs_ = [input.new_empty(0), input.new_empty(0)] # columns, ones
if not input.is_cuda:
raise NotImplementedError
else:
cur_im2col_step = min(ctx.im2col_step, input.shape[0])
assert (input.shape[0] %
cur_im2col_step) == 0, 'im2col step must divide batchsize'
_C.deform_conv_forward(
input,
weight,
offset,
output,
ctx.bufs_[0],
ctx.bufs_[1],
weight.size(3),
weight.size(2),
ctx.stride[1],
ctx.stride[0],
ctx.padding[1],
ctx.padding[0],
ctx.dilation[1],
ctx.dilation[0],
ctx.groups,
ctx.deformable_groups,
cur_im2col_step
)
return output
@staticmethod
@once_differentiable
def backward(ctx, grad_output):
input, offset, weight = ctx.saved_tensors
grad_input = grad_offset = grad_weight = None
if not grad_output.is_cuda:
raise NotImplementedError
else:
cur_im2col_step = min(ctx.im2col_step, input.shape[0])
assert (input.shape[0] %
cur_im2col_step) == 0, 'im2col step must divide batchsize'
if ctx.needs_input_grad[0] or ctx.needs_input_grad[1]:
grad_input = torch.zeros_like(input)
grad_offset = torch.zeros_like(offset)
_C.deform_conv_backward_input(
input,
offset,
grad_output,
grad_input,
grad_offset,
weight,
ctx.bufs_[0],
weight.size(3),
weight.size(2),
ctx.stride[1],
ctx.stride[0],
ctx.padding[1],
ctx.padding[0],
ctx.dilation[1],
ctx.dilation[0],
ctx.groups,
ctx.deformable_groups,
cur_im2col_step
)
if ctx.needs_input_grad[2]:
grad_weight = torch.zeros_like(weight)
_C.deform_conv_backward_parameters(
input,
offset,
grad_output,
grad_weight,
ctx.bufs_[0],
ctx.bufs_[1],
weight.size(3),
weight.size(2),
ctx.stride[1],
ctx.stride[0],
ctx.padding[1],
ctx.padding[0],
ctx.dilation[1],
ctx.dilation[0],
ctx.groups,
ctx.deformable_groups,
1,
cur_im2col_step
)
return (grad_input, grad_offset, grad_weight, None, None, None, None, None)
@staticmethod
def _output_size(input, weight, padding, dilation, stride):
channels = weight.size(0)
output_size = (input.size(0), channels)
for d in range(input.dim() - 2):
in_size = input.size(d + 2)
pad = padding[d]
kernel = dilation[d] * (weight.size(d + 2) - 1) + 1
stride_ = stride[d]
output_size += ((in_size + (2 * pad) - kernel) // stride_ + 1, )
if not all(map(lambda s: s > 0, output_size)):
raise ValueError(
"convolution input is too small (output would be {})".format(
'x'.join(map(str, output_size))))
return output_size
class ModulatedDeformConvFunction(Function):
@staticmethod
def forward(
ctx,
input,
offset,
mask,
weight,
bias=None,
stride=1,
padding=0,
dilation=1,
groups=1,
deformable_groups=1
):
ctx.stride = stride
ctx.padding = padding
ctx.dilation = dilation
ctx.groups = groups
ctx.deformable_groups = deformable_groups
ctx.with_bias = bias is not None
if not ctx.with_bias:
bias = input.new_empty(1) # fake tensor
if not input.is_cuda:
raise NotImplementedError
if weight.requires_grad or mask.requires_grad or offset.requires_grad \
or input.requires_grad:
ctx.save_for_backward(input, offset, mask, weight, bias)
output = input.new_empty(
ModulatedDeformConvFunction._infer_shape(ctx, input, weight))
ctx._bufs = [input.new_empty(0), input.new_empty(0)]
_C.modulated_deform_conv_forward(
input,
weight,
bias,
ctx._bufs[0],
offset,
mask,
output,
ctx._bufs[1],
weight.shape[2],
weight.shape[3],
ctx.stride,
ctx.stride,
ctx.padding,
ctx.padding,
ctx.dilation,
ctx.dilation,
ctx.groups,
ctx.deformable_groups,
ctx.with_bias
)
return output
@staticmethod
@once_differentiable
def backward(ctx, grad_output):
if not grad_output.is_cuda:
raise NotImplementedError
input, offset, mask, weight, bias = ctx.saved_tensors
grad_input = torch.zeros_like(input)
grad_offset = torch.zeros_like(offset)
grad_mask = torch.zeros_like(mask)
grad_weight = torch.zeros_like(weight)
grad_bias = torch.zeros_like(bias)
_C.modulated_deform_conv_backward(
input,
weight,
bias,
ctx._bufs[0],
offset,
mask,
ctx._bufs[1],
grad_input,
grad_weight,
grad_bias,
grad_offset,
grad_mask,
grad_output,
weight.shape[2],
weight.shape[3],
ctx.stride,
ctx.stride,
ctx.padding,
ctx.padding,
ctx.dilation,
ctx.dilation,
ctx.groups,
ctx.deformable_groups,
ctx.with_bias
)
if not ctx.with_bias:
grad_bias = None
return (grad_input, grad_offset, grad_mask, grad_weight, grad_bias,
None, None, None, None, None)
@staticmethod
def _infer_shape(ctx, input, weight):
n = input.size(0)
channels_out = weight.size(0)
height, width = input.shape[2:4]
kernel_h, kernel_w = weight.shape[2:4]
height_out = (height + 2 * ctx.padding -
(ctx.dilation * (kernel_h - 1) + 1)) // ctx.stride + 1
width_out = (width + 2 * ctx.padding -
(ctx.dilation * (kernel_w - 1) + 1)) // ctx.stride + 1
return n, channels_out, height_out, width_out
deform_conv = DeformConvFunction.apply
modulated_deform_conv = ModulatedDeformConvFunction.apply
class DeformConv(nn.Module):
def __init__(
self,
in_channels,
out_channels,
kernel_size,
stride=1,
padding=0,
dilation=1,
groups=1,
deformable_groups=1,
bias=False
):
assert not bias
super(DeformConv, self).__init__()
self.with_bias = bias
assert in_channels % groups == 0, \
'in_channels {} cannot be divisible by groups {}'.format(
in_channels, groups)
assert out_channels % groups == 0, \
'out_channels {} cannot be divisible by groups {}'.format(
out_channels, groups)
self.in_channels = in_channels
self.out_channels = out_channels
self.kernel_size = _pair(kernel_size)
self.stride = _pair(stride)
self.padding = _pair(padding)
self.dilation = _pair(dilation)
self.groups = groups
self.deformable_groups = deformable_groups
self.weight = nn.Parameter(
torch.Tensor(out_channels, in_channels // self.groups,
*self.kernel_size))
self.reset_parameters()
def reset_parameters(self):
n = self.in_channels
for k in self.kernel_size:
n *= k
stdv = 1. / math.sqrt(n)
self.weight.data.uniform_(-stdv, stdv)
@custom_fwd(cast_inputs=torch.float32)
def forward(self, input, offset):
return deform_conv(input, offset, self.weight, self.stride,
self.padding, self.dilation, self.groups,
self.deformable_groups)
def __repr__(self):
return "".join([
"{}(".format(self.__class__.__name__),
"in_channels={}, ".format(self.in_channels),
"out_channels={}, ".format(self.out_channels),
"kernel_size={}, ".format(self.kernel_size),
"stride={}, ".format(self.stride),
"dilation={}, ".format(self.dilation),
"padding={}, ".format(self.padding),
"groups={}, ".format(self.groups),
"deformable_groups={}, ".format(self.deformable_groups),
"bias={})".format(self.with_bias),
])
class ModulatedDeformConv(nn.Module):
def __init__(
self,
in_channels,
out_channels,
kernel_size,
stride=1,
padding=0,
dilation=1,
groups=1,
deformable_groups=1,
bias=True
):
super(ModulatedDeformConv, self).__init__()
self.in_channels = in_channels
self.out_channels = out_channels
self.kernel_size = _pair(kernel_size)
self.stride = stride
self.padding = padding
self.dilation = dilation
self.groups = groups
self.deformable_groups = deformable_groups
self.with_bias = bias
self.weight = nn.Parameter(torch.Tensor(
out_channels,
in_channels // groups,
*self.kernel_size
))
if bias:
self.bias = nn.Parameter(torch.Tensor(out_channels))
else:
self.register_parameter('bias', None)
self.reset_parameters()
def reset_parameters(self):
n = self.in_channels
for k in self.kernel_size:
n *= k
stdv = 1. / math.sqrt(n)
self.weight.data.uniform_(-stdv, stdv)
if self.bias is not None:
self.bias.data.zero_()
@custom_fwd(cast_inputs=torch.float32)
def forward(self, input, offset, mask):
return modulated_deform_conv(
input, offset, mask, self.weight, self.bias, self.stride,
self.padding, self.dilation, self.groups, self.deformable_groups)
def __repr__(self):
return "".join([
"{}(".format(self.__class__.__name__),
"in_channels={}, ".format(self.in_channels),
"out_channels={}, ".format(self.out_channels),
"kernel_size={}, ".format(self.kernel_size),
"stride={}, ".format(self.stride),
"dilation={}, ".format(self.dilation),
"padding={}, ".format(self.padding),
"groups={}, ".format(self.groups),
"deformable_groups={}, ".format(self.deformable_groups),
"bias={})".format(self.with_bias),
])
class ModulatedDeformConvPack(ModulatedDeformConv):
def __init__(self,
in_channels,
out_channels,
kernel_size,
stride=1,
padding=0,
dilation=1,
groups=1,
deformable_groups=1,
bias=True):
super(ModulatedDeformConvPack, self).__init__(
in_channels, out_channels, kernel_size, stride, padding, dilation,
groups, deformable_groups, bias)
self.conv_offset_mask = nn.Conv2d(
self.in_channels // self.groups,
self.deformable_groups * 3 * self.kernel_size[0] *
self.kernel_size[1],
kernel_size=self.kernel_size,
stride=_pair(self.stride),
padding=_pair(self.padding),
bias=True)
self.init_offset()
def init_offset(self):
self.conv_offset_mask.weight.data.zero_()
self.conv_offset_mask.bias.data.zero_()
@custom_fwd(cast_inputs=torch.float32)
def forward(self, input):
out = self.conv_offset_mask(input)
o1, o2, mask = torch.chunk(out, 3, dim=1)
offset = torch.cat((o1, o2), dim=1)
mask = torch.sigmoid(mask)
return modulated_deform_conv(
input, offset, mask, self.weight, self.bias, self.stride,
self.padding, self.dilation, self.groups, self.deformable_groups)
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