def main():
args = parser.parse_args()
if os.path.exists(args.output):
print("Error: Output filename ({}) already exists.".format(args.output))
exit(1)
# Load an existing checkpoint to CPU, strip everything but the state_dict and re-save
if args.checkpoint and os.path.isfile(args.checkpoint):
print("=> Loading checkpoint '{}'".format(args.checkpoint))
state_dict = load_state_dict(args.checkpoint, use_ema=args.use_ema)
new_state_dict = {}
for k, v in state_dict.items():
if args.clean_aux_bn and 'aux_bn' in k:
# If all aux_bn keys are removed, the SplitBN layers will end up as normal and
# load with the unmodified model using BatchNorm2d.
continue
name = k[7:] if k.startswith('module') else k
new_state_dict[name] = v
print("=> Loaded state_dict from '{}'".format(args.checkpoint))
try:
torch.save(new_state_dict, _TEMP_NAME, _use_new_zipfile_serialization=False)
except:
torch.save(new_state_dict, _TEMP_NAME)
with open(_TEMP_NAME, 'rb') as f:
sha_hash = hashlib.sha256(f.read()).hexdigest()
if args.output:
checkpoint_root, checkpoint_base = os.path.split(args.output)
checkpoint_base = os.path.splitext(checkpoint_base)[0]
else:
checkpoint_root = ''
checkpoint_base = os.path.splitext(args.checkpoint)[0]
final_filename = '-'.join([checkpoint_base, sha_hash[:8]]) + '.pth'
shutil.move(_TEMP_NAME, os.path.join(checkpoint_root, final_filename))
print("=> Saved state_dict to '{}, SHA256: {}'".format(final_filename, sha_hash))
else:
print("Error: Checkpoint ({}) doesn't exist".format(args.checkpoint))
def main():
args = parser.parse_args()
# by default use the EMA weights (if present)
args.use_ema = not args.no_use_ema
# by default sort by checkpoint metric (if present) and avg top n checkpoints
args.sort = not args.no_sort
if os.path.exists(args.output):
print("Error: Output filename ({}) already exists.".format(
args.output))
exit(1)
pattern = args.input
if not args.input.endswith(os.path.sep) and not args.filter.startswith(
os.path.sep):
pattern += os.path.sep
pattern += args.filter
checkpoints = glob.glob(pattern, recursive=True)
if not checkpoints:
print("Error: No checkpoints to average.")
exit(1)
if args.sort:
checkpoint_metrics = []
for c in checkpoints:
metric = checkpoint_metric(c)
if metric is not None:
checkpoint_metrics.append((metric, c))
checkpoint_metrics = list(
sorted(checkpoint_metrics, reverse=not args.descending))
checkpoint_metrics = checkpoint_metrics[:args.n]
print("Selected checkpoints:")
[print(m, c) for m, c in checkpoint_metrics]
avg_checkpoints = [c for m, c in checkpoint_metrics]
else:
avg_checkpoints = checkpoints
print("Selected checkpoints:")
[print(c) for c in checkpoints]
avg_state_dict = {}
avg_counts = {}
for c in avg_checkpoints:
new_state_dict = load_state_dict(c, args.use_ema)
if not new_state_dict:
print("Error: Checkpoint ({}) doesn't exist".format(
args.checkpoint))
continue
for k, v in new_state_dict.items():
if k not in avg_state_dict:
avg_state_dict[k] = v.clone().to(dtype=torch.float64)
avg_counts[k] = 1
else:
avg_state_dict[k] += v.to(dtype=torch.float64)
avg_counts[k] += 1
for k, v in avg_state_dict.items():
v.div_(avg_counts[k])
# float32 overflow seems unlikely based on weights seen to date, but who knows
float32_info = torch.finfo(torch.float32)
final_state_dict = {}
for k, v in avg_state_dict.items():
v = v.clamp(float32_info.min, float32_info.max)
final_state_dict[k] = v.to(dtype=torch.float32)
torch.save(final_state_dict, args.output)
with open(args.output, 'rb') as f:
sha_hash = hashlib.sha256(f.read()).hexdigest()
print("=> Saved state_dict to '{}, SHA256: {}'".format(
args.output, sha_hash))