157 lines
6.7 KiB
Python
157 lines
6.7 KiB
Python
import math
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import torch
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import torch.nn as nn
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import torch.nn.functional as F
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import numpy as np
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from models.archs.srflow_orig.RRDBNet_arch import RRDBNet
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from models.archs.srflow_orig.FlowUpsamplerNet import FlowUpsamplerNet
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import models.archs.srflow_orig.thops as thops
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import models.archs.srflow_orig.flow as flow
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from utils.util import opt_get
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class SRFlowNet(nn.Module):
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def __init__(self, in_nc, out_nc, nf, nb, gc=32, scale=4, K=None, opt=None, step=None):
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super(SRFlowNet, self).__init__()
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self.opt = opt
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self.quant = 255 if opt_get(opt, ['datasets', 'train', 'quant']) is \
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None else opt_get(opt, ['datasets', 'train', 'quant'])
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self.RRDB = RRDBNet(in_nc, out_nc, nf, nb, gc, scale, opt)
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if 'pretrain_rrdb' in opt['networks']['generator'].keys():
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rrdb_state_dict = torch.load(opt['networks']['generator']['pretrain_rrdb'])
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self.RRDB.load_state_dict(rrdb_state_dict, strict=True)
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hidden_channels = opt_get(opt, ['networks', 'generator','flow', 'hidden_channels'])
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hidden_channels = hidden_channels or 64
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self.RRDB_training = opt_get(self.opt, ['networks', 'generator','train_RRDB'], default=False)
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self.flowUpsamplerNet = \
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FlowUpsamplerNet((160, 160, 3), hidden_channels, K,
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flow_coupling=opt['networks']['generator']['flow']['coupling'], opt=opt)
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self.i = 0
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def get_random_z(self, heat, seed=None, batch_size=1, lr_shape=None, device='cuda'):
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if seed: torch.manual_seed(seed)
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if opt_get(self.opt, ['networks', 'generator', 'flow', 'split', 'enable']):
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C = self.flowUpsamplerNet.C
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H = int(self.opt['scale'] * lr_shape[2] // self.flowUpsamplerNet.scaleH)
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W = int(self.opt['scale'] * lr_shape[3] // self.flowUpsamplerNet.scaleW)
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size = (batch_size, C, H, W)
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if heat == 0:
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z = torch.zeros(size)
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else:
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z = torch.normal(mean=0, std=heat, size=size)
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else:
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L = opt_get(self.opt, ['networks', 'generator', 'flow', 'L']) or 3
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fac = 2 ** (L - 3)
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z_size = int(self.lr_size // (2 ** (L - 3)))
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z = torch.normal(mean=0, std=heat, size=(batch_size, 3 * 8 * 8 * fac * fac, z_size, z_size))
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return z.to(device)
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def forward(self, gt=None, lr=None, z=None, eps_std=None, reverse=False, epses=None, reverse_with_grad=False,
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lr_enc=None,
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add_gt_noise=False, step=None, y_label=None):
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if not reverse:
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return self.normal_flow(gt, lr, epses=epses, lr_enc=lr_enc, add_gt_noise=add_gt_noise, step=step,
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y_onehot=y_label)
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else:
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assert lr.shape[1] == 3
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if z is None:
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# Synthesize it.
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z = self.get_random_z(eps_std, batch_size=lr.shape[0], lr_shape=lr.shape, device=lr.device)
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if reverse_with_grad:
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return self.reverse_flow(lr, z, y_onehot=y_label, eps_std=eps_std, epses=epses, lr_enc=lr_enc,
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add_gt_noise=add_gt_noise)
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else:
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with torch.no_grad():
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return self.reverse_flow(lr, z, y_onehot=y_label, eps_std=eps_std, epses=epses, lr_enc=lr_enc,
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add_gt_noise=add_gt_noise)
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def normal_flow(self, gt, lr, y_onehot=None, epses=None, lr_enc=None, add_gt_noise=True, step=None):
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if lr_enc is None:
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if self.RRDB_training:
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lr_enc = self.rrdbPreprocessing(lr)
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else:
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with torch.no_grad():
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lr_enc = self.rrdbPreprocessing(lr)
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logdet = torch.zeros_like(gt[:, 0, 0, 0])
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pixels = thops.pixels(gt)
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z = gt
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if add_gt_noise:
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# Setup
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noiseQuant = opt_get(self.opt, ['networks', 'generator','flow', 'augmentation', 'noiseQuant'], True)
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if noiseQuant:
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z = z + ((torch.rand(z.shape, device=z.device) - 0.5) / self.quant)
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logdet = logdet + float(-np.log(self.quant) * pixels)
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# Encode
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epses, logdet = self.flowUpsamplerNet(rrdbResults=lr_enc, gt=z, logdet=logdet, reverse=False, epses=epses,
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y_onehot=y_onehot)
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objective = logdet.clone()
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if isinstance(epses, (list, tuple)):
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z = epses[-1]
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else:
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z = epses
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objective = objective + flow.GaussianDiag.logp(None, None, z)
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nll = (-objective) / float(np.log(2.) * pixels)
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if isinstance(epses, list):
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return epses, nll, logdet
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return z, nll, logdet
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def rrdbPreprocessing(self, lr):
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rrdbResults = self.RRDB(lr, get_steps=True)
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block_idxs = opt_get(self.opt, ['networks', 'generator','flow', 'stackRRDB', 'blocks']) or []
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if len(block_idxs) > 0:
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concat = torch.cat([rrdbResults["block_{}".format(idx)] for idx in block_idxs], dim=1)
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if opt_get(self.opt, ['networks', 'generator','flow', 'stackRRDB', 'concat']) or False:
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keys = ['last_lr_fea', 'fea_up1', 'fea_up2', 'fea_up4']
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if 'fea_up0' in rrdbResults.keys():
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keys.append('fea_up0')
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if 'fea_up-1' in rrdbResults.keys():
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keys.append('fea_up-1')
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if self.opt['scale'] >= 8:
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keys.append('fea_up8')
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if self.opt['scale'] == 16:
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keys.append('fea_up16')
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for k in keys:
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h = rrdbResults[k].shape[2]
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w = rrdbResults[k].shape[3]
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rrdbResults[k] = torch.cat([rrdbResults[k], F.interpolate(concat, (h, w))], dim=1)
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return rrdbResults
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def get_score(self, disc_loss_sigma, z):
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score_real = 0.5 * (1 - 1 / (disc_loss_sigma ** 2)) * thops.sum(z ** 2, dim=[1, 2, 3]) - \
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z.shape[1] * z.shape[2] * z.shape[3] * math.log(disc_loss_sigma)
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return -score_real
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def reverse_flow(self, lr, z, y_onehot, eps_std, epses=None, lr_enc=None, add_gt_noise=True):
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logdet = torch.zeros_like(lr[:, 0, 0, 0])
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pixels = thops.pixels(lr) * self.opt['scale'] ** 2
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if add_gt_noise:
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logdet = logdet - float(-np.log(self.quant) * pixels)
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if lr_enc is None:
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if self.RRDB_training:
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lr_enc = self.rrdbPreprocessing(lr)
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else:
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with torch.no_grad():
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lr_enc = self.rrdbPreprocessing(lr)
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x, logdet = self.flowUpsamplerNet(rrdbResults=lr_enc, z=z, eps_std=eps_std, reverse=True, epses=epses,
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logdet=logdet)
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return x, logdet
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