Source code for mmedit.models.common.gated_conv_module

# Copyright (c) OpenMMLab. All rights reserved.
import copy

import torch
import torch.nn as nn
from mmcv.cnn import ConvModule, build_activation_layer

[docs]class SimpleGatedConvModule(nn.Module): """Simple Gated Convolutional Module. This module is a simple gated convolutional module. The detailed formula is: .. math:: y = \\phi(conv1(x)) * \\sigma(conv2(x)), where `phi` is the feature activation function and `sigma` is the gate activation function. In default, the gate activation function is sigmoid. Args: in_channels (int): Same as nn.Conv2d. out_channels (int): The number of channels of the output feature. Note that `out_channels` in the conv module is doubled since this module contains two convolutions for feature and gate separately. kernel_size (int or tuple[int]): Same as nn.Conv2d. feat_act_cfg (dict): Config dict for feature activation layer. gate_act_cfg (dict): Config dict for gate activation layer. kwargs (keyword arguments): Same as `ConvModule`. """ def __init__(self, in_channels, out_channels, kernel_size, feat_act_cfg=dict(type='ELU'), gate_act_cfg=dict(type='Sigmoid'), **kwargs): super().__init__() # the activation function should specified outside conv module kwargs_ = copy.deepcopy(kwargs) kwargs_['act_cfg'] = None self.with_feat_act = feat_act_cfg is not None self.with_gate_act = gate_act_cfg is not None self.conv = ConvModule(in_channels, out_channels * 2, kernel_size, **kwargs_) if self.with_feat_act: self.feat_act = build_activation_layer(feat_act_cfg) if self.with_gate_act: self.gate_act = build_activation_layer(gate_act_cfg)
[docs] def forward(self, x): """Forward Function. Args: x (torch.Tensor): Input tensor with shape of (n, c, h, w). Returns: torch.Tensor: Output tensor with shape of (n, c, h', w'). """ x = self.conv(x) x, gate = torch.split(x, x.size(1) // 2, dim=1) if self.with_feat_act: x = self.feat_act(x) if self.with_gate_act: gate = self.gate_act(gate) x = x * gate return x
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