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| import functools | |
| import torch.nn as nn | |
| from ..util import ActNorm | |
| def weights_init(m): | |
| classname = m.__class__.__name__ | |
| if classname.find("Conv") != -1: | |
| nn.init.normal_(m.weight.data, 0.0, 0.02) | |
| elif classname.find("BatchNorm") != -1: | |
| nn.init.normal_(m.weight.data, 1.0, 0.02) | |
| nn.init.constant_(m.bias.data, 0) | |
| class NLayerDiscriminator(nn.Module): | |
| """Defines a PatchGAN discriminator as in Pix2Pix | |
| --> see https://github.com/junyanz/pytorch-CycleGAN-and-pix2pix/blob/master/models/networks.py | |
| """ | |
| def __init__(self, input_nc=3, ndf=64, n_layers=3, use_actnorm=False): | |
| """Construct a PatchGAN discriminator | |
| Parameters: | |
| input_nc (int) -- the number of channels in input images | |
| ndf (int) -- the number of filters in the last conv layer | |
| n_layers (int) -- the number of conv layers in the discriminator | |
| norm_layer -- normalization layer | |
| """ | |
| super(NLayerDiscriminator, self).__init__() | |
| if not use_actnorm: | |
| norm_layer = nn.BatchNorm2d | |
| else: | |
| norm_layer = ActNorm | |
| if ( | |
| type(norm_layer) == functools.partial | |
| ): # no need to use bias as BatchNorm2d has affine parameters | |
| use_bias = norm_layer.func != nn.BatchNorm2d | |
| else: | |
| use_bias = norm_layer != nn.BatchNorm2d | |
| kw = 4 | |
| padw = 1 | |
| sequence = [ | |
| nn.Conv2d(input_nc, ndf, kernel_size=kw, stride=2, padding=padw), | |
| nn.LeakyReLU(0.2, True), | |
| ] | |
| nf_mult = 1 | |
| nf_mult_prev = 1 | |
| for n in range(1, n_layers): # gradually increase the number of filters | |
| nf_mult_prev = nf_mult | |
| nf_mult = min(2**n, 8) | |
| sequence += [ | |
| nn.Conv2d( | |
| ndf * nf_mult_prev, | |
| ndf * nf_mult, | |
| kernel_size=kw, | |
| stride=2, | |
| padding=padw, | |
| bias=use_bias, | |
| ), | |
| norm_layer(ndf * nf_mult), | |
| nn.LeakyReLU(0.2, True), | |
| ] | |
| nf_mult_prev = nf_mult | |
| nf_mult = min(2**n_layers, 8) | |
| sequence += [ | |
| nn.Conv2d( | |
| ndf * nf_mult_prev, | |
| ndf * nf_mult, | |
| kernel_size=kw, | |
| stride=1, | |
| padding=padw, | |
| bias=use_bias, | |
| ), | |
| norm_layer(ndf * nf_mult), | |
| nn.LeakyReLU(0.2, True), | |
| ] | |
| sequence += [ | |
| nn.Conv2d(ndf * nf_mult, 1, kernel_size=kw, stride=1, padding=padw) | |
| ] # output 1 channel prediction map | |
| self.main = nn.Sequential(*sequence) | |
| def forward(self, input): | |
| """Standard forward.""" | |
| return self.main(input) | |