def load_checkpoint(filename: Pathlike,
model: AcousticModel) -> Dict[str, Any]:
logging.info('load checkpoint from {}'.format(filename))
checkpoint = torch.load(filename, map_location='cpu')
keys = [
'state_dict', 'epoch', 'learning_rate', 'objf', 'valid_objf',
'num_features', 'num_classes', 'subsampling_factor',
'global_batch_idx_train'
]
missing_keys = set(keys) - set(checkpoint.keys())
if missing_keys:
raise ValueError(f"Missing keys in checkpoint: {missing_keys}")
if not list(model.state_dict().keys())[0].startswith('module.') \
and list(checkpoint['state_dict'])[0].startswith('module.'):
# the checkpoint was saved by DDP
logging.info('load checkpoint from DDP')
dst_state_dict = model.state_dict()
src_state_dict = checkpoint['state_dict']
for key in dst_state_dict.keys():
src_key = '{}.{}'.format('module', key)
dst_state_dict[key] = src_state_dict.pop(src_key)
assert len(src_state_dict) == 0
model.load_state_dict(dst_state_dict)
else:
model.load_state_dict(checkpoint['state_dict'])
model.num_features = checkpoint['num_features']
model.num_classes = checkpoint['num_classes']
model.subsampling_factor = checkpoint['subsampling_factor']
return checkpoint
def load_checkpoint(
filename: Pathlike,
model: AcousticModel,
optimizer: Optional[object] = None,
scheduler: Optional[object] = None,
scaler: Optional[GradScaler] = None,
) -> Dict[str, Any]:
logging.info('load checkpoint from {}'.format(filename))
checkpoint = torch.load(filename, map_location='cpu')
keys = [
'state_dict', 'optimizer', 'scheduler', 'epoch', 'learning_rate',
'objf', 'valid_objf', 'num_features', 'num_classes',
'subsampling_factor', 'global_batch_idx_train'
]
missing_keys = set(keys) - set(checkpoint.keys())
if missing_keys:
raise ValueError(f"Missing keys in checkpoint: {missing_keys}")
if isinstance(model, DistributedDataParallel):
model = model.module
if not list(model.state_dict().keys())[0].startswith('module.') \
and list(checkpoint['state_dict'])[0].startswith('module.'):
# the checkpoint was saved by DDP
logging.info('load checkpoint from DDP')
dst_state_dict = model.state_dict()
src_state_dict = checkpoint['state_dict']
for key in dst_state_dict.keys():
src_key = '{}.{}'.format('module', key)
dst_state_dict[key] = src_state_dict.pop(src_key)
assert len(src_state_dict) == 0
model.load_state_dict(dst_state_dict, strict=False)
else:
model.load_state_dict(checkpoint['state_dict'], strict=False)
# Note we used strict=False above so that the current code
# can load models trained with P_scores.
model.num_features = checkpoint['num_features']
model.num_classes = checkpoint['num_classes']
model.subsampling_factor = checkpoint['subsampling_factor']
if optimizer is not None:
optimizer.load_state_dict(checkpoint['optimizer'])
if scheduler is not None:
scheduler.load_state_dict(checkpoint['scheduler'])
if scaler is not None:
scaler.load_state_dict(checkpoint['grad_scaler'])
return checkpoint
def average_checkpoint(filenames: List[Pathlike],
model: AcousticModel) -> Dict[str, Any]:
logging.info('average over checkpoints {}'.format(filenames))
avg_model = None
# sum
for filename in filenames:
checkpoint = torch.load(filename, map_location='cpu')
checkpoint_model = checkpoint['state_dict']
if avg_model is None:
avg_model = checkpoint_model
else:
for k in avg_model.keys():
avg_model[k] += checkpoint_model[k]
# average
for k in avg_model.keys():
if avg_model[k] is not None:
if avg_model[k].is_floating_point():
avg_model[k] /= len(filenames)
else:
avg_model[k] //= len(filenames)
checkpoint['state_dict'] = avg_model
keys = [
'state_dict', 'optimizer', 'scheduler', 'epoch', 'learning_rate',
'objf', 'valid_objf', 'num_features', 'num_classes',
'subsampling_factor', 'global_batch_idx_train'
]
missing_keys = set(keys) - set(checkpoint.keys())
if missing_keys:
raise ValueError(f"Missing keys in checkpoint: {missing_keys}")
if not list(model.state_dict().keys())[0].startswith('module.') \
and list(checkpoint['state_dict'])[0].startswith('module.'):
# the checkpoint was saved by DDP
logging.info('load checkpoint from DDP')
dst_state_dict = model.state_dict()
src_state_dict = checkpoint['state_dict']
for key in dst_state_dict.keys():
src_key = '{}.{}'.format('module', key)
dst_state_dict[key] = src_state_dict.pop(src_key)
assert len(src_state_dict) == 0
model.load_state_dict(dst_state_dict, strict=False)
else:
model.load_state_dict(checkpoint['state_dict'], strict=False)
model.num_features = checkpoint['num_features']
model.num_classes = checkpoint['num_classes']
model.subsampling_factor = checkpoint['subsampling_factor']
return checkpoint
