DL-Art-School/codes/models/steps/injectors.py

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import torch.nn
from models.archs.SPSR_arch import ImageGradientNoPadding
from data.weight_scheduler import get_scheduler_for_opt
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# 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 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 == 'img_grad':
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return ImageGradientInjector(opt_inject, env)
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elif type == 'add_noise':
return AddNoiseInjector(opt_inject, env)
elif type == 'greyscale':
return GreyInjector(opt_inject, env)
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elif type == 'interpolate':
return InterpolateInjector(opt_inject, env)
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elif type == 'imageflow':
return ImageFlowInjector(opt_inject, env)
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else:
raise NotImplementedError
class Injector(torch.nn.Module):
def __init__(self, opt, env):
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super(Injector, self).__init__()
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self.opt = opt
self.env = env
if 'in' in opt.keys():
self.input = opt['in']
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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)
def forward(self, state):
gen = self.env['generators'][self.opt['generator']]
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if isinstance(self.input, list):
params = [state[i] for i in self.input]
results = gen(*params)
else:
results = gen(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 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):
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
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# Creates an image gradient from [in] and injects it into [out]
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class ImageGradientInjector(Injector):
def __init__(self, opt, env):
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super(ImageGradientInjector, self).__init__(opt, env)
self.img_grad_fn = ImageGradientNoPadding().to(env['device'])
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def forward(self, state):
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return {self.opt['out']: self.img_grad_fn(state[self.opt['in']])}
# 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'])}
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# 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)
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']
noise = torch.randn_like(state[self.opt['in']], device=self.env['device']) * scale
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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)
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mean = mean.repeat(1, 3, 1, 1)
return {self.opt['out']: mean}
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class InterpolateInjector(Injector):
def __init__(self, opt, env):
super(InterpolateInjector, self).__init__(opt, env)
def forward(self, state):
scaled = torch.nn.functional.interpolate(state[self.opt['in']], scale_factor=self.opt['scale_factor'],
mode=self.opt['mode'])
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return {self.opt['out']: scaled}
class ImageFlowInjector(Injector):
def __init__(self, opt, env):
# Requires building this custom cuda kernel. Only require it if explicitly needed.
from models.networks.layers.resample2d_package.resample2d import Resample2d
super(ImageFlowInjector, self).__init__(opt, env)
self.resample = Resample2d()
def forward(self, state):
return self.resample(state[self.opt['in']], state[self.opt['flow']])