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utils.py
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utils.py
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# --------------------------------------------------------
# Swin Transformer
# Copyright (c) 2021 Microsoft
# Licensed under The MIT License [see LICENSE for details]
# Written by Ze Liu
# --------------------------------------------------------
import os
import torch
import torch.distributed as dist
try:
# noinspection PyUnresolvedReferences
from apex import amp
except ImportError:
amp = None
def load_checkpoint(config, model, optimizer, lr_scheduler, logger):
logger.info(f"==============> Resuming form {config.MODEL.RESUME}....................")
if config.MODEL.RESUME.startswith('https'):
checkpoint = torch.hub.load_state_dict_from_url(
config.MODEL.RESUME, map_location='cpu', check_hash=True)
else:
checkpoint = torch.load(config.MODEL.RESUME, map_location='cpu')
msg = model.load_state_dict(checkpoint['model'], strict=False)
logger.info(msg)
max_accuracy = 0.0
if not config.EVAL_MODE and 'optimizer' in checkpoint and 'lr_scheduler' in checkpoint and 'epoch' in checkpoint:
optimizer.load_state_dict(checkpoint['optimizer'])
lr_scheduler.load_state_dict(checkpoint['lr_scheduler'])
config.defrost()
config.TRAIN.START_EPOCH = checkpoint['epoch'] + 1
config.freeze()
if 'amp' in checkpoint and config.AMP_OPT_LEVEL != "O0" and checkpoint['config'].AMP_OPT_LEVEL != "O0":
amp.load_state_dict(checkpoint['amp'])
logger.info(f"=> loaded successfully '{config.MODEL.RESUME}' (epoch {checkpoint['epoch']})")
if 'max_accuracy' in checkpoint:
max_accuracy = checkpoint['max_accuracy']
del checkpoint
torch.cuda.empty_cache()
return max_accuracy
def load_pretrained(config, model, logger):
logger.info(f"==============> Loading weight {config.MODEL.PRETRAINED} for fine-tuning......")
checkpoint = torch.load(config.MODEL.PRETRAINED, map_location='cpu')
state_dict = checkpoint['model']
# delete relative_position_index since we always re-init it
relative_position_index_keys = [k for k in state_dict.keys() if "relative_position_index" in k]
for k in relative_position_index_keys:
del state_dict[k]
# delete relative_coords_table since we always re-init it
relative_position_index_keys = [k for k in state_dict.keys() if "relative_coords_table" in k]
for k in relative_position_index_keys:
del state_dict[k]
# delete attn_mask since we always re-init it
attn_mask_keys = [k for k in state_dict.keys() if "attn_mask" in k]
for k in attn_mask_keys:
del state_dict[k]
# bicubic interpolate relative_position_bias_table if not match
relative_position_bias_table_keys = [k for k in state_dict.keys() if "relative_position_bias_table" in k]
for k in relative_position_bias_table_keys:
relative_position_bias_table_pretrained = state_dict[k]
relative_position_bias_table_current = model.state_dict()[k]
L1, nH1 = relative_position_bias_table_pretrained.size()
L2, nH2 = relative_position_bias_table_current.size()
if nH1 != nH2:
logger.warning(f"Error in loading {k}, passing......")
else:
if L1 != L2:
# bicubic interpolate relative_position_bias_table if not match
S1 = int(L1 ** 0.5)
S2 = int(L2 ** 0.5)
relative_position_bias_table_pretrained_resized = torch.nn.functional.interpolate(
relative_position_bias_table_pretrained.permute(1, 0).view(1, nH1, S1, S1), size=(S2, S2),
mode='bicubic')
state_dict[k] = relative_position_bias_table_pretrained_resized.view(nH2, L2).permute(1, 0)
# bicubic interpolate absolute_pos_embed if not match
absolute_pos_embed_keys = [k for k in state_dict.keys() if "absolute_pos_embed" in k]
for k in absolute_pos_embed_keys:
# dpe
absolute_pos_embed_pretrained = state_dict[k]
absolute_pos_embed_current = model.state_dict()[k]
_, L1, C1 = absolute_pos_embed_pretrained.size()
_, L2, C2 = absolute_pos_embed_current.size()
if C1 != C1:
logger.warning(f"Error in loading {k}, passing......")
else:
if L1 != L2:
S1 = int(L1 ** 0.5)
S2 = int(L2 ** 0.5)
absolute_pos_embed_pretrained = absolute_pos_embed_pretrained.reshape(-1, S1, S1, C1)
absolute_pos_embed_pretrained = absolute_pos_embed_pretrained.permute(0, 3, 1, 2)
absolute_pos_embed_pretrained_resized = torch.nn.functional.interpolate(
absolute_pos_embed_pretrained, size=(S2, S2), mode='bicubic')
absolute_pos_embed_pretrained_resized = absolute_pos_embed_pretrained_resized.permute(0, 2, 3, 1)
absolute_pos_embed_pretrained_resized = absolute_pos_embed_pretrained_resized.flatten(1, 2)
state_dict[k] = absolute_pos_embed_pretrained_resized
# check classifier, if not match, then re-init classifier to zero
head_bias_pretrained = state_dict['head.bias']
Nc1 = head_bias_pretrained.shape[0]
Nc2 = model.head.bias.shape[0]
if (Nc1 != Nc2):
if Nc1 == 21841 and Nc2 == 1000:
logger.info("loading ImageNet-22K weight to ImageNet-1K ......")
map22kto1k_path = f'data/map22kto1k.txt'
with open(map22kto1k_path) as f:
map22kto1k = f.readlines()
map22kto1k = [int(id22k.strip()) for id22k in map22kto1k]
state_dict['head.weight'] = state_dict['head.weight'][map22kto1k, :]
state_dict['head.bias'] = state_dict['head.bias'][map22kto1k]
else:
torch.nn.init.constant_(model.head.bias, 0.)
torch.nn.init.constant_(model.head.weight, 0.)
del state_dict['head.weight']
del state_dict['head.bias']
logger.warning(f"Error in loading classifier head, re-init classifier head to 0")
msg = model.load_state_dict(state_dict, strict=False)
logger.warning(msg)
logger.info(f"=> loaded successfully '{config.MODEL.PRETRAINED}'")
del checkpoint
torch.cuda.empty_cache()
def save_checkpoint(config, epoch, model, max_accuracy, optimizer, lr_scheduler, logger):
save_state = {'model': model.state_dict(),
'optimizer': optimizer.state_dict(),
'lr_scheduler': lr_scheduler.state_dict(),
'max_accuracy': max_accuracy,
'epoch': epoch,
'config': config}
if config.AMP_OPT_LEVEL != "O0":
save_state['amp'] = amp.state_dict()
save_path = os.path.join(config.OUTPUT, f'ckpt_epoch_{epoch}.pth')
logger.info(f"{save_path} saving......")
torch.save(save_state, save_path)
logger.info(f"{save_path} saved !!!")
def get_grad_norm(parameters, norm_type=2):
if isinstance(parameters, torch.Tensor):
parameters = [parameters]
parameters = list(filter(lambda p: p.grad is not None, parameters))
norm_type = float(norm_type)
total_norm = 0
for p in parameters:
param_norm = p.grad.data.norm(norm_type)
total_norm += param_norm.item() ** norm_type
total_norm = total_norm ** (1. / norm_type)
return total_norm
def auto_resume_helper(output_dir):
checkpoints = os.listdir(output_dir)
checkpoints = [ckpt for ckpt in checkpoints if ckpt.endswith('pth')]
print(f"All checkpoints founded in {output_dir}: {checkpoints}")
if len(checkpoints) > 0:
latest_checkpoint = max([os.path.join(output_dir, d) for d in checkpoints], key=os.path.getmtime)
print(f"The latest checkpoint founded: {latest_checkpoint}")
resume_file = latest_checkpoint
else:
resume_file = None
return resume_file
def reduce_tensor(tensor):
rt = tensor.clone()
dist.all_reduce(rt, op=dist.ReduceOp.SUM)
rt /= dist.get_world_size()
return rt