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| # Copyright (c) SenseTime Research. All rights reserved. | |
| # Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved. | |
| # | |
| # NVIDIA CORPORATION and its licensors retain all intellectual property | |
| # and proprietary rights in and to this software, related documentation | |
| # and any modifications thereto. Any use, reproduction, disclosure or | |
| # distribution of this software and related documentation without an express | |
| # license agreement from NVIDIA CORPORATION is strictly prohibited. | |
| """Custom replacement for `torch.nn.functional.conv2d` that supports | |
| arbitrarily high order gradients with zero performance penalty.""" | |
| import warnings | |
| import contextlib | |
| import torch | |
| # pylint: disable=redefined-builtin | |
| # pylint: disable=arguments-differ | |
| # pylint: disable=protected-access | |
| #---------------------------------------------------------------------------- | |
| enabled = False # Enable the custom op by setting this to true. | |
| weight_gradients_disabled = False # Forcefully disable computation of gradients with respect to the weights. | |
| def no_weight_gradients(): | |
| global weight_gradients_disabled | |
| old = weight_gradients_disabled | |
| weight_gradients_disabled = True | |
| yield | |
| weight_gradients_disabled = old | |
| #---------------------------------------------------------------------------- | |
| def conv2d(input, weight, bias=None, stride=1, padding=0, dilation=1, groups=1): | |
| if _should_use_custom_op(input): | |
| return _conv2d_gradfix(transpose=False, weight_shape=weight.shape, stride=stride, padding=padding, output_padding=0, dilation=dilation, groups=groups).apply(input, weight, bias) | |
| return torch.nn.functional.conv2d(input=input, weight=weight, bias=bias, stride=stride, padding=padding, dilation=dilation, groups=groups) | |
| def conv_transpose2d(input, weight, bias=None, stride=1, padding=0, output_padding=0, groups=1, dilation=1): | |
| if _should_use_custom_op(input): | |
| return _conv2d_gradfix(transpose=True, weight_shape=weight.shape, stride=stride, padding=padding, output_padding=output_padding, groups=groups, dilation=dilation).apply(input, weight, bias) | |
| return torch.nn.functional.conv_transpose2d(input=input, weight=weight, bias=bias, stride=stride, padding=padding, output_padding=output_padding, groups=groups, dilation=dilation) | |
| #---------------------------------------------------------------------------- | |
| def _should_use_custom_op(input): | |
| assert isinstance(input, torch.Tensor) | |
| if (not enabled) or (not torch.backends.cudnn.enabled): | |
| return False | |
| if input.device.type != 'cuda': | |
| return False | |
| if any(torch.__version__.startswith(x) for x in ['1.7.', '1.8.', '1.9']): | |
| return True | |
| warnings.warn(f'conv2d_gradfix not supported on PyTorch {torch.__version__}. Falling back to torch.nn.functional.conv2d().') | |
| return False | |
| def _tuple_of_ints(xs, ndim): | |
| xs = tuple(xs) if isinstance(xs, (tuple, list)) else (xs,) * ndim | |
| assert len(xs) == ndim | |
| assert all(isinstance(x, int) for x in xs) | |
| return xs | |
| #---------------------------------------------------------------------------- | |
| _conv2d_gradfix_cache = dict() | |
| def _conv2d_gradfix(transpose, weight_shape, stride, padding, output_padding, dilation, groups): | |
| # Parse arguments. | |
| ndim = 2 | |
| weight_shape = tuple(weight_shape) | |
| stride = _tuple_of_ints(stride, ndim) | |
| padding = _tuple_of_ints(padding, ndim) | |
| output_padding = _tuple_of_ints(output_padding, ndim) | |
| dilation = _tuple_of_ints(dilation, ndim) | |
| # Lookup from cache. | |
| key = (transpose, weight_shape, stride, padding, output_padding, dilation, groups) | |
| if key in _conv2d_gradfix_cache: | |
| return _conv2d_gradfix_cache[key] | |
| # Validate arguments. | |
| assert groups >= 1 | |
| assert len(weight_shape) == ndim + 2 | |
| assert all(stride[i] >= 1 for i in range(ndim)) | |
| assert all(padding[i] >= 0 for i in range(ndim)) | |
| assert all(dilation[i] >= 0 for i in range(ndim)) | |
| if not transpose: | |
| assert all(output_padding[i] == 0 for i in range(ndim)) | |
| else: # transpose | |
| assert all(0 <= output_padding[i] < max(stride[i], dilation[i]) for i in range(ndim)) | |
| # Helpers. | |
| common_kwargs = dict(stride=stride, padding=padding, dilation=dilation, groups=groups) | |
| def calc_output_padding(input_shape, output_shape): | |
| if transpose: | |
| return [0, 0] | |
| return [ | |
| input_shape[i + 2] | |
| - (output_shape[i + 2] - 1) * stride[i] | |
| - (1 - 2 * padding[i]) | |
| - dilation[i] * (weight_shape[i + 2] - 1) | |
| for i in range(ndim) | |
| ] | |
| # Forward & backward. | |
| class Conv2d(torch.autograd.Function): | |
| def forward(ctx, input, weight, bias): | |
| assert weight.shape == weight_shape | |
| if not transpose: | |
| output = torch.nn.functional.conv2d(input=input, weight=weight, bias=bias, **common_kwargs) | |
| else: # transpose | |
| output = torch.nn.functional.conv_transpose2d(input=input, weight=weight, bias=bias, output_padding=output_padding, **common_kwargs) | |
| ctx.save_for_backward(input, weight) | |
| return output | |
| def backward(ctx, grad_output): | |
| input, weight = ctx.saved_tensors | |
| grad_input = None | |
| grad_weight = None | |
| grad_bias = None | |
| if ctx.needs_input_grad[0]: | |
| p = calc_output_padding(input_shape=input.shape, output_shape=grad_output.shape) | |
| grad_input = _conv2d_gradfix(transpose=(not transpose), weight_shape=weight_shape, output_padding=p, **common_kwargs).apply(grad_output, weight, None) | |
| assert grad_input.shape == input.shape | |
| if ctx.needs_input_grad[1] and not weight_gradients_disabled: | |
| grad_weight = Conv2dGradWeight.apply(grad_output, input) | |
| assert grad_weight.shape == weight_shape | |
| if ctx.needs_input_grad[2]: | |
| grad_bias = grad_output.sum([0, 2, 3]) | |
| return grad_input, grad_weight, grad_bias | |
| # Gradient with respect to the weights. | |
| class Conv2dGradWeight(torch.autograd.Function): | |
| def forward(ctx, grad_output, input): | |
| op = torch._C._jit_get_operation('aten::cudnn_convolution_backward_weight' if not transpose else 'aten::cudnn_convolution_transpose_backward_weight') | |
| flags = [torch.backends.cudnn.benchmark, torch.backends.cudnn.deterministic, torch.backends.cudnn.allow_tf32] | |
| grad_weight = op(weight_shape, grad_output, input, padding, stride, dilation, groups, *flags) | |
| assert grad_weight.shape == weight_shape | |
| ctx.save_for_backward(grad_output, input) | |
| return grad_weight | |
| def backward(ctx, grad2_grad_weight): | |
| grad_output, input = ctx.saved_tensors | |
| grad2_grad_output = None | |
| grad2_input = None | |
| if ctx.needs_input_grad[0]: | |
| grad2_grad_output = Conv2d.apply(input, grad2_grad_weight, None) | |
| assert grad2_grad_output.shape == grad_output.shape | |
| if ctx.needs_input_grad[1]: | |
| p = calc_output_padding(input_shape=input.shape, output_shape=grad_output.shape) | |
| grad2_input = _conv2d_gradfix(transpose=(not transpose), weight_shape=weight_shape, output_padding=p, **common_kwargs).apply(grad_output, grad2_grad_weight, None) | |
| assert grad2_input.shape == input.shape | |
| return grad2_grad_output, grad2_input | |
| _conv2d_gradfix_cache[key] = Conv2d | |
| return Conv2d | |
| #---------------------------------------------------------------------------- | |