def run_fthmc(
flow: nn.ModuleList,
config: TrainConfig,
lfconfig: lfConfig,
xi: torch.Tensor = None,
nprint: int = 50,
nplot: int = 10,
window: int = 1,
num_trajs: int = 1024,
**kwargs,
):
logger.rule(f'Running `ftHMC` using trained flow for {num_trajs} trajs')
if torch.cuda.is_available():
flow.to('cuda')
flow.eval()
ft = FieldTransformation(flow=flow, config=config, lfconfig=lfconfig)
logdir = config.logdir
ftstr = lfconfig.uniquestr()
fthmcdir = os.path.join(logdir, 'ftHMC', ftstr)
pdir = os.path.join(fthmcdir, 'plots')
sdir = os.path.join(fthmcdir, 'summaries')
writer = SummaryWriter(log_dir=sdir)
history = ft.run(x=xi, nprint=nprint, nplot=nplot, window=window,
num_trajs=num_trajs, writer=writer, plotdir=pdir,
**kwargs)
histfile = os.path.join(fthmcdir, 'history.z')
logger.log(f'Saving history to: {histfile}')
joblib.dump(history, histfile)
return {'field_transformation': ft, 'history': history}
class GramDistanceResnet50(Module):
"""A module which calculates the GramMatrixLoss of two images after every bottleneck layer in ResNet50"""
def __init__(self):
super().__init__()
self.layers = ModuleList(self.prepare_layers())
self.layers.eval()
self.num_gram_layers = sum(1 for layer in self.layers
if isinstance(layer, GramMatrixLoss))
def prepare_layers(self):
"""Insert GramMatrixLoss layers after every bottleneck layer in the Resnet50 architecture"""
base_model = resnet50(pretrained=True)
layers = [
base_model.conv1,
GramMatrixLoss(), base_model.bn1, base_model.relu,
base_model.maxpool, base_model.layer1[0],
GramMatrixLoss(), base_model.layer1[1],
GramMatrixLoss(), base_model.layer1[2],
GramMatrixLoss(), base_model.layer2[0],
GramMatrixLoss(), base_model.layer2[1],
GramMatrixLoss(), base_model.layer2[2],
GramMatrixLoss(), base_model.layer2[3],
GramMatrixLoss(), base_model.layer3[0],
GramMatrixLoss(), base_model.layer3[1],
GramMatrixLoss(), base_model.layer3[2],
GramMatrixLoss(), base_model.layer3[3],
GramMatrixLoss(), base_model.layer3[4],
GramMatrixLoss(), base_model.layer3[5],
GramMatrixLoss(), base_model.layer4[0],
GramMatrixLoss(), base_model.layer4[1],
GramMatrixLoss(), base_model.layer4[2],
GramMatrixLoss()
]
return layers
def forward(self, img1, img2):
"""Calculate the Gram matrix distances between pairs of images
Parameters
----------
img1: torch.Tensor
The first batch of images as a tensor with shape (batch, channels, height, width)
img2: torch.Tensor
The second batch of images as a tensor with shape (batch, channels, height, width)
Returns
-------
torch.Tensor
A tensor containing the Gram matrix distances for each example in the batch with shape
(batch, layers), where layers corresponds to the number of GramMatrixLoss layers.
"""
if img1.size() != img2.size():
raise ValueError(
'Input images to GramMatrixLoss must have the same shape!')
features1 = img1
features2 = img2
losses = []
for layer in self.layers:
if isinstance(layer, GramMatrixLoss):
loss = layer(features1, features2)
losses.append(loss)
else:
features1 = layer(features1)
features2 = layer(features2)
losses = torch.stack(losses)
return losses