DL-Art-School/codes/trainer/networks.py

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import importlib
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import logging
import pkgutil
import sys
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from collections import OrderedDict
from inspect import isfunction, getmembers
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import torch
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import models.feature_arch as feature_arch
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logger = logging.getLogger('base')
class RegisteredModelNameError(Exception):
def __init__(self, name_error):
super().__init__(f'Registered DLAS modules must start with `register_`. Incorrect registration: {name_error}')
# Decorator that allows API clients to show DLAS how to build a nn.Module from an opt dict.
# Functions with this decorator should have a specific naming format:
# `register_<name>` where <name> is the name that will be used in configuration files to reference this model.
# Functions with this decorator are expected to take a single argument:
# - opt: A dict with the configuration options for building the module.
# They should return:
# - A torch.nn.Module object for the model being defined.
def register_model(func):
if func.__name__.startswith("register_"):
func._dlas_model_name = func.__name__[9:]
assert func._dlas_model_name
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else:
raise RegisteredModelNameError(func.__name__)
func._dlas_registered_model = True
return func
def find_registered_model_fns(base_path='models'):
found_fns = {}
module_iter = pkgutil.walk_packages([base_path])
for mod in module_iter:
if mod.ispkg:
EXCLUSION_LIST = ['flownet2']
if mod.name not in EXCLUSION_LIST:
found_fns.update(find_registered_model_fns(f'{base_path}/{mod.name}'))
else:
mod_name = f'{base_path}/{mod.name}'.replace('/', '.')
importlib.import_module(mod_name)
for mod_fn in getmembers(sys.modules[mod_name], isfunction):
if hasattr(mod_fn[1], "_dlas_registered_model"):
found_fns[mod_fn[1]._dlas_model_name] = mod_fn[1]
return found_fns
class CreateModelError(Exception):
def __init__(self, name, available):
super().__init__(f'Could not find the specified model name: {name}. Tip: If your model is in a'
f' subdirectory, that directory must contain an __init__.py to be scanned. Available models:'
f'{available}')
def create_model(opt, opt_net):
which_model = opt_net['which_model']
# For backwards compatibility.
if not which_model:
which_model = opt_net['which_model_G']
if not which_model:
which_model = opt_net['which_model_D']
registered_fns = find_registered_model_fns()
if which_model not in registered_fns.keys():
raise CreateModelError(which_model, list(registered_fns.keys()))
return registered_fns[which_model](opt_net, opt)
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# Define network used for perceptual loss
def define_F(which_model='vgg', use_bn=False, for_training=False, load_path=None, feature_layers=None):
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if which_model == 'vgg':
# PyTorch pretrained VGG19-54, before ReLU.
if feature_layers is None:
if use_bn:
feature_layers = [49]
else:
feature_layers = [34]
if for_training:
netF = feature_arch.TrainableVGGFeatureExtractor(feature_layers=feature_layers, use_bn=use_bn,
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use_input_norm=True)
else:
netF = feature_arch.VGGFeatureExtractor(feature_layers=feature_layers, use_bn=use_bn,
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use_input_norm=True)
elif which_model == 'wide_resnet':
netF = feature_arch.WideResnetFeatureExtractor(use_input_norm=True)
else:
raise NotImplementedError
if load_path:
# Load the model parameters:
load_net = torch.load(load_path)
load_net_clean = OrderedDict() # remove unnecessary 'module.'
for k, v in load_net.items():
if k.startswith('module.'):
load_net_clean[k[7:]] = v
else:
load_net_clean[k] = v
netF.load_state_dict(load_net_clean)
if not for_training:
# Put into eval mode, freeze the parameters and set the 'weight' field.
netF.eval()
for k, v in netF.named_parameters():
v.requires_grad = False
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return netF