basicsr.archs.dfdnet_util

basicsr.archs.dfdnet_util.AttentionBlock(in_channel)

class basicsr.archs.dfdnet_util.Blur(channel)

Bases: Module

forward(x)

Defines the computation performed at every call.

Should be overridden by all subclasses.

Note

Although the recipe for forward pass needs to be defined within this function, one should call the Module instance afterwards instead of this since the former takes care of running the registered hooks while the latter silently ignores them.

training: bool

class basicsr.archs.dfdnet_util.BlurFunction(*args, **kwargs)

Bases: Function

static backward(ctx, grad_output)

Defines a formula for differentiating the operation with backward mode automatic differentiation (alias to the vjp function).

This function is to be overridden by all subclasses.

It must accept a context ctx as the first argument, followed by as many outputs as the forward() returned (None will be passed in for non tensor outputs of the forward function), and it should return as many tensors, as there were inputs to forward(). Each argument is the gradient w.r.t the given output, and each returned value should be the gradient w.r.t. the corresponding input. If an input is not a Tensor or is a Tensor not requiring grads, you can just pass None as a gradient for that input.

The context can be used to retrieve tensors saved during the forward pass. It also has an attribute ctx.needs_input_grad as a tuple of booleans representing whether each input needs gradient. E.g., backward() will have ctx.needs_input_grad[0] = True if the first input to forward() needs gradient computated w.r.t. the output.

static forward(ctx, x, kernel, kernel_flip)

Performs the operation.

This function is to be overridden by all subclasses.

It must accept a context ctx as the first argument, followed by any number of arguments (tensors or other types).

The context can be used to store arbitrary data that can be then retrieved during the backward pass. Tensors should not be stored directly on ctx (though this is not currently enforced for backward compatibility). Instead, tensors should be saved either with ctx.save_for_backward() if they are intended to be used in backward (equivalently, vjp) or ctx.save_for_forward() if they are intended to be used for in jvp.

class basicsr.archs.dfdnet_util.BlurFunctionBackward(*args, **kwargs)

Bases: Function

static backward(ctx, gradgrad_output)

Defines a formula for differentiating the operation with backward mode automatic differentiation (alias to the vjp function).

This function is to be overridden by all subclasses.

It must accept a context ctx as the first argument, followed by as many outputs as the forward() returned (None will be passed in for non tensor outputs of the forward function), and it should return as many tensors, as there were inputs to forward(). Each argument is the gradient w.r.t the given output, and each returned value should be the gradient w.r.t. the corresponding input. If an input is not a Tensor or is a Tensor not requiring grads, you can just pass None as a gradient for that input.

The context can be used to retrieve tensors saved during the forward pass. It also has an attribute ctx.needs_input_grad as a tuple of booleans representing whether each input needs gradient. E.g., backward() will have ctx.needs_input_grad[0] = True if the first input to forward() needs gradient computated w.r.t. the output.

static forward(ctx, grad_output, kernel, kernel_flip)

Performs the operation.

This function is to be overridden by all subclasses.

It must accept a context ctx as the first argument, followed by any number of arguments (tensors or other types).

The context can be used to store arbitrary data that can be then retrieved during the backward pass. Tensors should not be stored directly on ctx (though this is not currently enforced for backward compatibility). Instead, tensors should be saved either with ctx.save_for_backward() if they are intended to be used in backward (equivalently, vjp) or ctx.save_for_forward() if they are intended to be used for in jvp.

class basicsr.archs.dfdnet_util.MSDilationBlock(in_channels, kernel_size=3, dilation=(1, 1, 1, 1), bias=True)

Bases: Module

Multi-scale dilation block.

forward(x)

Defines the computation performed at every call.

Should be overridden by all subclasses.

Note

Although the recipe for forward pass needs to be defined within this function, one should call the Module instance afterwards instead of this since the former takes care of running the registered hooks while the latter silently ignores them.

training: bool

class basicsr.archs.dfdnet_util.UpResBlock(in_channel)

Bases: Module

forward(x)

Defines the computation performed at every call.

Should be overridden by all subclasses.

Note

Although the recipe for forward pass needs to be defined within this function, one should call the Module instance afterwards instead of this since the former takes care of running the registered hooks while the latter silently ignores them.

training: bool

basicsr.archs.dfdnet_util.adaptive_instance_normalization(content_feat, style_feat)

Adaptive instance normalization.

Adjust the reference features to have the similar color and illuminations as those in the degradate features.

Parameters:

• content_feat (Tensor) – The reference feature.

• style_feat (Tensor) – The degradate features.

basicsr.archs.dfdnet_util.blur()

basicsr.archs.dfdnet_util.calc_mean_std(feat, eps=1e-05)

Calculate mean and std for adaptive_instance_normalization.

Parameters:

• feat (Tensor) – 4D tensor.

• eps (float) – A small value added to the variance to avoid divide-by-zero. Default: 1e-5.

basicsr.archs.dfdnet_util.conv_block(in_channels, out_channels, kernel_size=3, stride=1, dilation=1, bias=True)

Conv block used in MSDilationBlock.