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import torch
import torch.nn as nn
import torch.nn.functional as F
from taming.modules.losses.vqperceptual import * # TODO: taming dependency yes/no?
from ..vaemodules.discriminator import Discriminator3D
class LPIPSWithDiscriminator(nn.Module):
def __init__(self, disc_start, logvar_init=0.0, kl_weight=1.0, pixelloss_weight=1.0,
disc_num_layers=3, disc_in_channels=3, disc_factor=1.0, disc_weight=1.0,
perceptual_weight=1.0, use_actnorm=False, disc_conditional=False,
disc_loss="hinge", l2_loss_weight=0.0, l1_loss_weight=1.0):
super().__init__()
assert disc_loss in ["hinge", "vanilla"]
self.kl_weight = kl_weight
self.pixel_weight = pixelloss_weight
self.perceptual_loss = LPIPS().eval()
self.perceptual_weight = perceptual_weight
# output log variance
self.logvar = nn.Parameter(torch.ones(size=()) * logvar_init)
self.discriminator = NLayerDiscriminator(input_nc=disc_in_channels,
n_layers=disc_num_layers,
use_actnorm=use_actnorm
).apply(weights_init)
self.discriminator3d = Discriminator3D(
in_channels=disc_in_channels,
block_out_channels=(64, 128, 256)
).apply(weights_init)
self.discriminator_iter_start = disc_start
self.disc_loss = hinge_d_loss if disc_loss == "hinge" else vanilla_d_loss
self.disc_factor = disc_factor
self.discriminator_weight = disc_weight
self.disc_conditional = disc_conditional
self.l1_loss_weight = l1_loss_weight
self.l2_loss_weight = l2_loss_weight
def calculate_adaptive_weight(self, nll_loss, g_loss, last_layer=None):
if last_layer is not None:
nll_grads = torch.autograd.grad(nll_loss, last_layer, retain_graph=True)[0]
g_grads = torch.autograd.grad(g_loss, last_layer, retain_graph=True)[0]
else:
nll_grads = torch.autograd.grad(nll_loss, self.last_layer[0], retain_graph=True)[0]
g_grads = torch.autograd.grad(g_loss, self.last_layer[0], retain_graph=True)[0]
d_weight = torch.norm(nll_grads) / (torch.norm(g_grads) + 1e-4)
d_weight = torch.clamp(d_weight, 0.0, 1e4).detach()
d_weight = d_weight * self.discriminator_weight
return d_weight
def forward(self, inputs, reconstructions, posteriors, optimizer_idx,
global_step, last_layer=None, cond=None, split="train",
weights=None):
if inputs.ndim==4:
inputs = inputs.unsqueeze(2)
if reconstructions.ndim==4:
reconstructions = reconstructions.unsqueeze(2)
inputs_ori = inputs
reconstructions_ori = reconstructions
# get new loss_weight
loss_weights = 1
# b, _ ,f, _, _ = reconstructions.size()
# loss_weights = torch.ones([b, f]).view(b, 1, f, 1, 1)
# loss_weights[:, :, 0] = 3
# for i in range(1, f, 8):
# loss_weights[:, :, i - 1] = 3
# loss_weights[:, :, i] = 3
# loss_weights[:, :, -1] = 3
# loss_weights = loss_weights.permute(0, 2, 1, 3, 4).flatten(0, 1).to(reconstructions.device)
inputs = inputs.permute(0, 2, 1, 3, 4).flatten(0, 1)
reconstructions = reconstructions.permute(0, 2, 1, 3, 4).flatten(0, 1)
rec_loss = 0
if self.l1_loss_weight > 0:
rec_loss += torch.abs(inputs.contiguous() - reconstructions.contiguous()) * self.l1_loss_weight
if self.l2_loss_weight > 0:
rec_loss += F.mse_loss(inputs.contiguous(), reconstructions.contiguous(), reduction="none") * self.l2_loss_weight
if self.perceptual_weight > 0:
p_loss = self.perceptual_loss(inputs.contiguous(), reconstructions.contiguous())
rec_loss = rec_loss + self.perceptual_weight * p_loss
rec_loss = rec_loss * loss_weights
nll_loss = rec_loss / torch.exp(self.logvar) + self.logvar
weighted_nll_loss = nll_loss
if weights is not None:
weighted_nll_loss = weights*nll_loss
weighted_nll_loss = torch.sum(weighted_nll_loss) / weighted_nll_loss.shape[0]
nll_loss = torch.sum(nll_loss) / nll_loss.shape[0]
kl_loss = posteriors.kl()
kl_loss = torch.sum(kl_loss) / kl_loss.shape[0]
# now the GAN part
if optimizer_idx == 0:
# generator update
if cond is None:
assert not self.disc_conditional
logits_fake = self.discriminator(reconstructions.contiguous())
else:
assert self.disc_conditional
logits_fake = self.discriminator(torch.cat((reconstructions.contiguous(), cond), dim=1))
logits_fake_3d = self.discriminator3d(reconstructions_ori.contiguous())
g_loss = -torch.mean(logits_fake) - torch.mean(logits_fake_3d)
if self.disc_factor > 0.0:
try:
d_weight = self.calculate_adaptive_weight(nll_loss, g_loss, last_layer=last_layer)
except RuntimeError:
assert not self.training
d_weight = torch.tensor(0.0)
else:
d_weight = torch.tensor(0.0)
disc_factor = adopt_weight(self.disc_factor, global_step, threshold=self.discriminator_iter_start)
loss = weighted_nll_loss + self.kl_weight * kl_loss + d_weight * disc_factor * g_loss
log = {"{}/total_loss".format(split): loss.clone().detach().mean(), "{}/logvar".format(split): self.logvar.detach(),
"{}/kl_loss".format(split): kl_loss.detach().mean(), "{}/nll_loss".format(split): nll_loss.detach().mean(),
"{}/rec_loss".format(split): rec_loss.detach().mean(),
"{}/d_weight".format(split): d_weight.detach(),
"{}/disc_factor".format(split): torch.tensor(disc_factor),
"{}/g_loss".format(split): g_loss.detach().mean(),
}
return loss, log
if optimizer_idx == 1:
# second pass for discriminator update
if cond is None:
logits_real = self.discriminator(inputs.contiguous().detach())
logits_fake = self.discriminator(reconstructions.contiguous().detach())
else:
logits_real = self.discriminator(torch.cat((inputs.contiguous().detach(), cond), dim=1))
logits_fake = self.discriminator(torch.cat((reconstructions.contiguous().detach(), cond), dim=1))
logits_real_3d = self.discriminator3d(inputs_ori.contiguous().detach())
logits_fake_3d = self.discriminator3d(reconstructions_ori.contiguous().detach())
disc_factor = adopt_weight(self.disc_factor, global_step, threshold=self.discriminator_iter_start)
d_loss = disc_factor * self.disc_loss(logits_real, logits_fake) + disc_factor * self.disc_loss(logits_real_3d, logits_fake_3d)
log = {"{}/disc_loss".format(split): d_loss.clone().detach().mean(),
"{}/logits_real".format(split): logits_real.detach().mean(),
"{}/logits_fake".format(split): logits_fake.detach().mean()
}
return d_loss, log
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