def load_class(filename, paths, concat=True):
"""
Look for a file in different locations and return its method with the same name
Optionally, you can use concat to search in path.filename instead
Parameters
----------
filename : str
Name of the file we are searching for
paths : str or list of str
Folders in which the file will be searched
concat : bool
Flag to concatenate filename to each path during the search
Returns
-------
method : Function
Loaded method
"""
# for each path in paths
for path in make_list(paths):
# Create full path
full_path = '{}.{}'.format(path, filename) if concat else path
if importlib.util.find_spec(full_path):
# Return method with same name as the file
return getattr(importlib.import_module(full_path), filename)
raise ValueError('Unknown class {}'.format(filename))
def load_network(network, path, prefixes=''):
"""
Loads a pretrained network
Parameters
----------
network : nn.Module
Network that will receive the pretrained weights
path : str
File containing a 'state_dict' key with pretrained network weights
prefixes : str or list of str
Layer name prefixes to consider when loading the network
Returns
-------
network : nn.Module
Updated network with pretrained weights
"""
prefixes = make_list(prefixes)
# If path is a string
if is_str(path):
saved_state_dict = torch.load(path, map_location='cpu')['state_dict']
if path.endswith('.pth.tar'):
saved_state_dict = backwards_state_dict(saved_state_dict)
# If state dict is already provided
else:
saved_state_dict = path
# Get network state dict
network_state_dict = network.state_dict()
updated_state_dict = OrderedDict()
n, n_total = 0, len(network_state_dict.keys())
for key, val in saved_state_dict.items():
for prefix in prefixes:
prefix = prefix + '.'
if prefix in key:
idx = key.find(prefix) + len(prefix)
key = key[idx:]
if key in network_state_dict.keys() and \
same_shape(val.shape, network_state_dict[key].shape):
updated_state_dict[key] = val
n += 1
try:
network.load_state_dict(updated_state_dict, strict=True)
except Exception as e:
print(e)
network.load_state_dict(updated_state_dict, strict=False)
base_color, attrs = 'cyan', ['bold', 'dark']
color = 'green' if n == n_total else 'yellow' if n > 0 else 'red'
print0(pcolor('=====###### Pretrained {} loaded:'.format(prefixes[0]), base_color, attrs=attrs) +
pcolor(' {}/{} '.format(n, n_total), color, attrs=attrs) +
pcolor('tensors', base_color, attrs=attrs))
return network
def compute_inv_depths(self, image):
"""Computes inverse depth maps from single images"""
# Randomly flip and estimate inverse depth maps
flip_lr = random.random(
) < self.flip_lr_prob if self.training else False
inv_depths = make_list(flip_model(self.depth_net, image, flip_lr))
# If upsampling depth maps
if self.upsample_depth_maps:
inv_depths = interpolate_scales(inv_depths,
mode='nearest',
align_corners=None)
# Return inverse depth maps
return inv_depths
def compute_inv_depths(self, image, ref_imgs, intrinsics):
"""Computes inverse depth maps from single images"""
# Randomly flip and estimate inverse depth maps
flip_lr = random.random(
) < self.flip_lr_prob if self.training else False
if flip_lr:
intrinsics = flip_lr_intr(intrinsics, width=image.shape[3])
inv_depths_with_poses = flip_mf_model(self.depth_net, image, ref_imgs,
intrinsics, flip_lr)
inv_depths, poses = inv_depths_with_poses
inv_depths = make_list(inv_depths)
if flip_lr:
inv_depths = [flip_lr_img(inv_d) for inv_d in inv_depths]
# If upsampling depth maps
if self.upsample_depth_maps:
inv_depths = interpolate_scales(inv_depths,
mode='nearest',
align_corners=None)
# Return inverse depth maps
return inv_depths, poses
def __getitem__(self, idx):
"""Get a dataset sample"""
# Get DGP sample (if single sensor, make it a list)
self.sample_dgp = self.dataset[idx]
self.sample_dgp = [make_list(sample) for sample in self.sample_dgp]
# Loop over all cameras
sample = []
for i in range(self.num_cameras):
data = {
'idx': idx,
'dataset_idx': self.dataset_idx,
'sensor_name': self.get_current('datum_name', i),
#
'filename': self.get_filename(idx, i),
'splitname': '%s_%010d' % (self.split, idx),
#
'rgb': self.get_current('rgb', i),
'intrinsics': self.get_current('intrinsics', i),
}
# If depth is returned
if self.with_depth:
data.update({
'depth':
self.generate_depth_map(idx, i, data['filename'])
})
# If pose is returned
if self.with_pose:
data.update({
'extrinsics': self.get_current('extrinsics', i).matrix,
'pose': self.get_current('pose', i).matrix,
})
# If context is returned
if self.has_context:
data.update({
'rgb_context': self.get_context('rgb', i),
})
# If context pose is returned
if self.with_pose:
# Get original values to calculate relative motion
orig_extrinsics = Pose.from_matrix(data['extrinsics'])
orig_pose = Pose.from_matrix(data['pose'])
data.update({
'extrinsics_context':
[(orig_extrinsics.inverse() * extrinsics).matrix
for extrinsics in self.get_context('extrinsics', i)],
'pose_context':
[(orig_pose.inverse() * pose).matrix
for pose in self.get_context('pose', i)],
})
sample.append(data)
# Apply same data transformations for all sensors
if self.data_transform:
sample = [self.data_transform(smp) for smp in sample]
# Return sample (stacked if necessary)
return stack_sample(sample)