DL-Art-School/codes/trainer/injectors.py
2020-12-18 09:24:31 -07:00

412 lines
16 KiB
Python

import random
import torch.nn
from torch.cuda.amp import autocast
from utils.weight_scheduler import get_scheduler_for_opt
from trainer.losses import extract_params_from_state
# Injectors are a way to sythesize data within a step that can then be used (and reused) by loss functions.
def create_injector(opt_inject, env):
type = opt_inject['type']
if 'teco_' in type:
from trainer.custom_training_components import create_teco_injector
return create_teco_injector(opt_inject, env)
elif 'progressive_' in type:
from trainer.custom_training_components import create_progressive_zoom_injector
return create_progressive_zoom_injector(opt_inject, env)
elif 'stereoscopic_' in type:
from trainer.custom_training_components import create_stereoscopic_injector
return create_stereoscopic_injector(opt_inject, env)
elif 'igpt' in type:
from models.transformers.igpt import gpt2
return gpt2.create_injector(opt_inject, env)
elif type == 'generator':
return ImageGeneratorInjector(opt_inject, env)
elif type == 'discriminator':
return DiscriminatorInjector(opt_inject, env)
elif type == 'scheduled_scalar':
return ScheduledScalarInjector(opt_inject, env)
elif type == 'add_noise':
return AddNoiseInjector(opt_inject, env)
elif type == 'greyscale':
return GreyInjector(opt_inject, env)
elif type == 'interpolate':
return InterpolateInjector(opt_inject, env)
elif type == 'image_patch':
return ImagePatchInjector(opt_inject, env)
elif type == 'concatenate':
return ConcatenateInjector(opt_inject, env)
elif type == 'margin_removal':
return MarginRemoval(opt_inject, env)
elif type == 'foreach':
return ForEachInjector(opt_inject, env)
elif type == 'constant':
return ConstantInjector(opt_inject, env)
elif type == 'extract_indices':
return IndicesExtractor(opt_inject, env)
elif type == 'random_shift':
return RandomShiftInjector(opt_inject, env)
elif type == 'batch_rotate':
return BatchRotateInjector(opt_inject, env)
elif type == 'sr_diffs':
return SrDiffsInjector(opt_inject, env)
elif type == 'multiframe_combiner':
return MultiFrameCombiner(opt_inject, env)
else:
raise NotImplementedError
class Injector(torch.nn.Module):
def __init__(self, opt, env):
super(Injector, self).__init__()
self.opt = opt
self.env = env
if 'in' in opt.keys():
self.input = opt['in']
self.output = opt['out']
# This should return a dict of new state variables.
def forward(self, state):
raise NotImplementedError
# Uses a generator to synthesize an image from [in] and injects the results into [out]
# Note that results are *not* detached.
class ImageGeneratorInjector(Injector):
def __init__(self, opt, env):
super(ImageGeneratorInjector, self).__init__(opt, env)
self.grad = opt['grad'] if 'grad' in opt.keys() else True
def forward(self, state):
gen = self.env['generators'][self.opt['generator']]
with autocast(enabled=self.env['opt']['fp16']):
if isinstance(self.input, list):
params = extract_params_from_state(self.input, state)
else:
params = [state[self.input]]
if self.grad:
results = gen(*params)
else:
with torch.no_grad():
results = gen(*params)
new_state = {}
if isinstance(self.output, list):
# Only dereference tuples or lists, not tensors.
assert isinstance(results, list) or isinstance(results, tuple)
for i, k in enumerate(self.output):
new_state[k] = results[i]
else:
new_state[self.output] = results
return new_state
# Injects a result from a discriminator network into the state.
class DiscriminatorInjector(Injector):
def __init__(self, opt, env):
super(DiscriminatorInjector, self).__init__(opt, env)
def forward(self, state):
with autocast(enabled=self.env['opt']['fp16']):
d = self.env['discriminators'][self.opt['discriminator']]
if isinstance(self.input, list):
params = [state[i] for i in self.input]
results = d(*params)
else:
results = d(state[self.input])
new_state = {}
if isinstance(self.output, list):
# Only dereference tuples or lists, not tensors.
assert isinstance(results, list) or isinstance(results, tuple)
for i, k in enumerate(self.output):
new_state[k] = results[i]
else:
new_state[self.output] = results
return new_state
# Injects a scalar that is modulated with a specified schedule. Useful for increasing or decreasing the influence
# of something over time.
class ScheduledScalarInjector(Injector):
def __init__(self, opt, env):
super(ScheduledScalarInjector, self).__init__(opt, env)
self.scheduler = get_scheduler_for_opt(opt['scheduler'])
def forward(self, state):
return {self.opt['out']: self.scheduler.get_weight_for_step(self.env['step'])}
# Adds gaussian noise to [in], scales it to [0,[scale]] and injects into [out]
class AddNoiseInjector(Injector):
def __init__(self, opt, env):
super(AddNoiseInjector, self).__init__(opt, env)
self.mode = opt['mode'] if 'mode' in opt.keys() else 'normal'
def forward(self, state):
# Scale can be a fixed float, or a state key (e.g. from ScheduledScalarInjector).
if isinstance(self.opt['scale'], str):
scale = state[self.opt['scale']]
else:
scale = self.opt['scale']
if scale is None:
scale = 1
ref = state[self.opt['in']]
if self.mode == 'normal':
noise = torch.randn_like(ref) * scale
elif self.mode == 'uniform':
noise = torch.FloatTensor(ref.shape).uniform_(0.0, scale).to(ref.device)
return {self.opt['out']: state[self.opt['in']] + noise}
# Averages the channel dimension (1) of [in] and saves to [out]. Dimensions are
# kept the same, the average is simply repeated.
class GreyInjector(Injector):
def __init__(self, opt, env):
super(GreyInjector, self).__init__(opt, env)
def forward(self, state):
mean = torch.mean(state[self.opt['in']], dim=1, keepdim=True)
mean = mean.repeat(1, 3, 1, 1)
return {self.opt['out']: mean}
class InterpolateInjector(Injector):
def __init__(self, opt, env):
super(InterpolateInjector, self).__init__(opt, env)
if 'scale_factor' in opt.keys():
self.scale_factor = opt['scale_factor']
self.size = None
else:
self.scale_factor = None
self.size = (opt['size'], opt['size'])
def forward(self, state):
scaled = torch.nn.functional.interpolate(state[self.opt['in']], scale_factor=self.opt['scale_factor'],
size=self.opt['size'], mode=self.opt['mode'])
return {self.opt['out']: scaled}
# Extracts four patches from the input image, each a square of 'patch_size'. The input images are taken from each
# of the four corners of the image. The intent of this loss is that each patch shares some part of the input, which
# can then be used in the translation invariance loss.
#
# This injector is unique in that it does not only produce the specified output label into state. Instead it produces five
# outputs for the specified label, one for each corner of the input as well as the specified output, which is the top left
# corner. See the code below to find out how this works.
#
# Another note: this injector operates differently in eval mode (e.g. when env['training']=False) - in this case, it
# simply sets all the output state variables to the input. This is so that you can feed the output of this injector
# directly into your generator in training without affecting test performance.
class ImagePatchInjector(Injector):
def __init__(self, opt, env):
super(ImagePatchInjector, self).__init__(opt, env)
self.patch_size = opt['patch_size']
self.resize = opt['resize'] if 'resize' in opt.keys() else None # If specified, the output is resized to a square with this size after patch extraction.
def forward(self, state):
im = state[self.opt['in']]
if self.env['training']:
res = { self.opt['out']: im[:, :3, :self.patch_size, :self.patch_size],
'%s_top_left' % (self.opt['out'],): im[:, :, :self.patch_size, :self.patch_size],
'%s_top_right' % (self.opt['out'],): im[:, :, :self.patch_size, -self.patch_size:],
'%s_bottom_left' % (self.opt['out'],): im[:, :, -self.patch_size:, :self.patch_size],
'%s_bottom_right' % (self.opt['out'],): im[:, :, -self.patch_size:, -self.patch_size:] }
else:
res = { self.opt['out']: im,
'%s_top_left' % (self.opt['out'],): im,
'%s_top_right' % (self.opt['out'],): im,
'%s_bottom_left' % (self.opt['out'],): im,
'%s_bottom_right' % (self.opt['out'],): im }
if self.resize is not None:
res2 = {}
for k, v in res.items():
res2[k] = torch.nn.functional.interpolate(v, size=(self.resize, self.resize), mode="nearest")
res = res2
return res
# Concatenates a list of tensors on the specified dimension.
class ConcatenateInjector(Injector):
def __init__(self, opt, env):
super(ConcatenateInjector, self).__init__(opt, env)
self.dim = opt['dim']
def forward(self, state):
input = [state[i] for i in self.input]
return {self.opt['out']: torch.cat(input, dim=self.dim)}
# Removes margins from an image.
class MarginRemoval(Injector):
def __init__(self, opt, env):
super(MarginRemoval, self).__init__(opt, env)
self.margin = opt['margin']
self.random_shift_max = opt['random_shift_max'] if 'random_shift_max' in opt.keys() else 0
def forward(self, state):
input = state[self.input]
if self.random_shift_max > 0:
output = []
# This is a really shitty way of doing this. If it works at all, I should reconsider using Resample2D, for example.
for b in range(input.shape[0]):
shiftleft = random.randint(-self.random_shift_max, self.random_shift_max)
shifttop = random.randint(-self.random_shift_max, self.random_shift_max)
output.append(input[b, :, self.margin+shiftleft:-(self.margin-shiftleft),
self.margin+shifttop:-(self.margin-shifttop)])
output = torch.stack(output, dim=0)
else:
output = input[:, :, self.margin:-self.margin,
self.margin:-self.margin]
return {self.opt['out']: output}
# Produces an injection which is composed of applying a single injector multiple times across a single dimension.
class ForEachInjector(Injector):
def __init__(self, opt, env):
super(ForEachInjector, self).__init__(opt, env)
o = opt.copy()
o['type'] = opt['subtype']
o['in'] = '_in'
o['out'] = '_out'
self.injector = create_injector(o, self.env)
self.aslist = opt['aslist'] if 'aslist' in opt.keys() else False
def forward(self, state):
injs = []
st = state.copy()
inputs = state[self.opt['in']]
for i in range(inputs.shape[1]):
st['_in'] = inputs[:, i]
injs.append(self.injector(st)['_out'])
if self.aslist:
return {self.output: injs}
else:
return {self.output: torch.stack(injs, dim=1)}
class ConstantInjector(Injector):
def __init__(self, opt, env):
super(ConstantInjector, self).__init__(opt, env)
self.constant_type = opt['constant_type']
self.like = opt['like'] # This injector uses this tensor to determine what batch size and device to use.
def forward(self, state):
like = state[self.like]
if self.constant_type == 'zeroes':
out = torch.zeros_like(like)
else:
raise NotImplementedError
return { self.opt['out']: out }
class IndicesExtractor(Injector):
def __init__(self, opt, env):
super(IndicesExtractor, self).__init__(opt, env)
self.dim = opt['dim']
assert self.dim == 1 # Honestly not sure how to support an abstract dim here, so just add yours when needed.
def forward(self, state):
results = {}
for i, o in enumerate(self.output):
if self.dim == 1:
results[o] = state[self.input][:, i]
return results
class RandomShiftInjector(Injector):
def __init__(self, opt, env):
super(RandomShiftInjector, self).__init__(opt, env)
def forward(self, state):
img = state[self.input]
return {self.output: img}
class BatchRotateInjector(Injector):
def __init__(self, opt, env):
super(BatchRotateInjector, self).__init__(opt, env)
def forward(self, state):
img = state[self.input]
return {self.output: torch.roll(img, 1, 0)}
# Injector used to work with image deltas used in diff-SR
class SrDiffsInjector(Injector):
def __init__(self, opt, env):
super(SrDiffsInjector, self).__init__(opt, env)
self.mode = opt['mode']
assert self.mode in ['recombine', 'produce_diff']
self.lq = opt['lq']
self.hq = opt['hq']
if self.mode == 'produce_diff':
self.diff_key = opt['diff']
self.include_combined = opt['include_combined']
def forward(self, state):
resampled_lq = state[self.lq]
hq = state[self.hq]
if self.mode == 'produce_diff':
diff = hq - resampled_lq
if self.include_combined:
res = torch.cat([resampled_lq, diff, hq], dim=1)
else:
res = torch.cat([resampled_lq, diff], dim=1)
return {self.output: res,
self.diff_key: diff}
elif self.mode == 'recombine':
combined = resampled_lq + hq
return {self.output: combined}
class MultiFrameCombiner(Injector):
def __init__(self, opt, env):
super().__init__(opt, env)
self.mode = opt['mode']
self.dim = opt['dim'] if 'dim' in opt.keys() else None
self.flow = opt['flow']
self.in_lq_key = opt['in']
self.in_hq_key = opt['in_hq']
self.out_lq_key = opt['out']
self.out_hq_key = opt['out_hq']
from models.flownet2.networks import Resample2d
self.resampler = Resample2d()
def combine(self, state):
flow = self.env['generators'][self.flow]
lq = state[self.in_lq_key]
hq = state[self.in_hq_key]
b, f, c, h, w = lq.shape
center = f // 2
center_img = lq[:,center,:,:,:]
imgs = [center_img]
with torch.no_grad():
for i in range(f):
if i == center:
continue
nimg = lq[:,i,:,:,:]
flowfield = flow(torch.stack([center_img, nimg], dim=2).float())
nimg = self.resampler(nimg, flowfield)
imgs.append(nimg)
hq_out = hq[:,center,:,:,:]
return {self.out_lq_key: torch.cat(imgs, dim=1),
self.out_hq_key: hq_out,
self.out_lq_key + "_flow_sample": torch.cat(imgs, dim=0)}
def synthesize(self, state):
lq = state[self.in_lq_key]
return {
self.out_lq_key: lq.repeat(1, self.dim, 1, 1)
}
def forward(self, state):
if self.mode == "synthesize":
return self.synthesize(state)
elif self.mode == "combine":
return self.combine(state)
else:
raise NotImplementedError