DL-Art-School/codes/models/srflow/FlowStep.py
2020-12-19 10:28:23 -07:00

121 lines
4.9 KiB
Python

import torch
from torch import nn as nn
import models.srflow.Permutations
import models.srflow.FlowAffineCouplingsAblation
import models.srflow.FlowActNorms
def getConditional(rrdbResults, position):
img_ft = rrdbResults if isinstance(rrdbResults, torch.Tensor) else rrdbResults[position]
return img_ft
class FlowStep(nn.Module):
FlowPermutation = {
"reverse": lambda obj, z, logdet, rev: (obj.reverse(z, rev), logdet),
"shuffle": lambda obj, z, logdet, rev: (obj.shuffle(z, rev), logdet),
"invconv": lambda obj, z, logdet, rev: obj.invconv(z, logdet, rev),
"squeeze_invconv": lambda obj, z, logdet, rev: obj.invconv(z, logdet, rev),
"resqueeze_invconv_alternating_2_3": lambda obj, z, logdet, rev: obj.invconv(z, logdet, rev),
"resqueeze_invconv_3": lambda obj, z, logdet, rev: obj.invconv(z, logdet, rev),
"InvertibleConv1x1GridAlign": lambda obj, z, logdet, rev: obj.invconv(z, logdet, rev),
"InvertibleConv1x1SubblocksShuf": lambda obj, z, logdet, rev: obj.invconv(z, logdet, rev),
"InvertibleConv1x1GridAlignIndepBorder": lambda obj, z, logdet, rev: obj.invconv(z, logdet, rev),
"InvertibleConv1x1GridAlignIndepBorder4": lambda obj, z, logdet, rev: obj.invconv(z, logdet, rev),
}
def __init__(self, in_channels, hidden_channels,
actnorm_scale=1.0, flow_permutation="invconv", flow_coupling="additive",
LU_decomposed=False, opt=None, image_injector=None, idx=None, acOpt=None, normOpt=None, in_shape=None,
position=None):
# check configures
assert flow_permutation in FlowStep.FlowPermutation, \
"float_permutation should be in `{}`".format(
FlowStep.FlowPermutation.keys())
super().__init__()
self.flow_permutation = flow_permutation
self.flow_coupling = flow_coupling
self.image_injector = image_injector
self.norm_type = normOpt['type'] if normOpt else 'ActNorm2d'
self.position = normOpt['position'] if normOpt else None
self.in_shape = in_shape
self.position = position
self.acOpt = acOpt
# 1. actnorm
self.actnorm = models.srflow.FlowActNorms.ActNorm2d(in_channels, actnorm_scale)
# 2. permute
if flow_permutation == "invconv":
self.invconv = models.srflow.Permutations.InvertibleConv1x1(
in_channels, LU_decomposed=LU_decomposed)
# 3. coupling
if flow_coupling == "CondAffineSeparatedAndCond":
self.affine = models.srflow.FlowAffineCouplingsAblation.CondAffineSeparatedAndCond(in_channels=in_channels,
opt=opt)
elif flow_coupling == "noCoupling":
pass
else:
raise RuntimeError("coupling not Found:", flow_coupling)
def forward(self, input, logdet=None, rrdbResults=None, reverse=False):
if not reverse:
return self.normal_flow(input, logdet, rrdbResults)
else:
return self.reverse_flow(input, logdet, rrdbResults)
def normal_flow(self, z, logdet, rrdbResults=None):
if self.flow_coupling == "bentIdentityPreAct":
z, logdet = self.bentIdentPar(z, logdet, reverse=False)
# 1. actnorm
if self.norm_type == "ConditionalActNormImageInjector":
img_ft = getConditional(rrdbResults, self.position)
z, logdet = self.actnorm(z, img_ft=img_ft, logdet=logdet, reverse=False)
elif self.norm_type == "noNorm":
pass
else:
z, logdet = self.actnorm(z, logdet=logdet, reverse=False)
# 2. permute
z, logdet = FlowStep.FlowPermutation[self.flow_permutation](
self, z, logdet, False)
need_features = self.affine_need_features()
# 3. coupling
if need_features or self.flow_coupling in ["condAffine", "condFtAffine", "condNormAffine"]:
img_ft = getConditional(rrdbResults, self.position)
z, logdet = self.affine(input=z, logdet=logdet, reverse=False, ft=img_ft)
return z, logdet
def reverse_flow(self, z, logdet, rrdbResults=None):
need_features = self.affine_need_features()
# 1.coupling
if need_features or self.flow_coupling in ["condAffine", "condFtAffine", "condNormAffine"]:
img_ft = getConditional(rrdbResults, self.position)
z, logdet = self.affine(input=z, logdet=logdet, reverse=True, ft=img_ft)
# 2. permute
z, logdet = FlowStep.FlowPermutation[self.flow_permutation](
self, z, logdet, True)
# 3. actnorm
z, logdet = self.actnorm(z, logdet=logdet, reverse=True)
return z, logdet
def affine_need_features(self):
need_features = False
try:
need_features = self.affine.need_features
except:
pass
return need_features