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optimizer.py
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optimizer.py
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# --------------------------------------------------------
# Swin Transformer
# Copyright (c) 2021 Microsoft
# Licensed under The MIT License [see LICENSE for details]
# Written by Ze Liu
# --------------------------------------------------------
from functools import partial
from torch import optim as optim
try:
from apex.optimizers import FusedAdam, FusedLAMB
except:
FusedAdam = None
FusedLAMB = None
print("To use FusedLAMB or FusedAdam, please install apex.")
def build_optimizer(config, model, simmim=False, is_pretrain=False):
"""
Build optimizer, set weight decay of normalization to 0 by default.
"""
skip = {}
skip_keywords = {}
if hasattr(model, 'no_weight_decay'):
skip = model.no_weight_decay()
if hasattr(model, 'no_weight_decay_keywords'):
skip_keywords = model.no_weight_decay_keywords()
if simmim:
if is_pretrain:
parameters = get_pretrain_param_groups(model, skip, skip_keywords)
else:
depths = config.MODEL.SWIN.DEPTHS if config.MODEL.TYPE == 'swin' else config.MODEL.SWINV2.DEPTHS
num_layers = sum(depths)
get_layer_func = partial(get_swin_layer, num_layers=num_layers + 2, depths=depths)
scales = list(config.TRAIN.LAYER_DECAY ** i for i in reversed(range(num_layers + 2)))
parameters = get_finetune_param_groups(model, config.TRAIN.BASE_LR, config.TRAIN.WEIGHT_DECAY, get_layer_func, scales, skip, skip_keywords)
else:
parameters = set_weight_decay(model, skip, skip_keywords)
opt_lower = config.TRAIN.OPTIMIZER.NAME.lower()
optimizer = None
if opt_lower == 'sgd':
optimizer = optim.SGD(parameters, momentum=config.TRAIN.OPTIMIZER.MOMENTUM, nesterov=True,
lr=config.TRAIN.BASE_LR, weight_decay=config.TRAIN.WEIGHT_DECAY)
elif opt_lower == 'adamw':
optimizer = optim.AdamW(parameters, eps=config.TRAIN.OPTIMIZER.EPS, betas=config.TRAIN.OPTIMIZER.BETAS,
lr=config.TRAIN.BASE_LR, weight_decay=config.TRAIN.WEIGHT_DECAY)
elif opt_lower == 'fused_adam':
optimizer = FusedAdam(parameters, eps=config.TRAIN.OPTIMIZER.EPS, betas=config.TRAIN.OPTIMIZER.BETAS,
lr=config.TRAIN.BASE_LR, weight_decay=config.TRAIN.WEIGHT_DECAY)
elif opt_lower == 'fused_lamb':
optimizer = FusedLAMB(parameters, eps=config.TRAIN.OPTIMIZER.EPS, betas=config.TRAIN.OPTIMIZER.BETAS,
lr=config.TRAIN.BASE_LR, weight_decay=config.TRAIN.WEIGHT_DECAY)
return optimizer
def set_weight_decay(model, skip_list=(), skip_keywords=()):
has_decay = []
no_decay = []
for name, param in model.named_parameters():
if not param.requires_grad:
continue # frozen weights
if len(param.shape) == 1 or name.endswith(".bias") or (name in skip_list) or \
check_keywords_in_name(name, skip_keywords):
no_decay.append(param)
# print(f"{name} has no weight decay")
else:
has_decay.append(param)
return [{'params': has_decay},
{'params': no_decay, 'weight_decay': 0.}]
def check_keywords_in_name(name, keywords=()):
isin = False
for keyword in keywords:
if keyword in name:
isin = True
return isin
def get_pretrain_param_groups(model, skip_list=(), skip_keywords=()):
has_decay = []
no_decay = []
has_decay_name = []
no_decay_name = []
for name, param in model.named_parameters():
if not param.requires_grad:
continue
if len(param.shape) == 1 or name.endswith(".bias") or (name in skip_list) or \
check_keywords_in_name(name, skip_keywords):
no_decay.append(param)
no_decay_name.append(name)
else:
has_decay.append(param)
has_decay_name.append(name)
return [{'params': has_decay},
{'params': no_decay, 'weight_decay': 0.}]
def get_swin_layer(name, num_layers, depths):
if name in ("mask_token"):
return 0
elif name.startswith("patch_embed"):
return 0
elif name.startswith("layers"):
layer_id = int(name.split('.')[1])
block_id = name.split('.')[3]
if block_id == 'reduction' or block_id == 'norm':
return sum(depths[:layer_id + 1])
layer_id = sum(depths[:layer_id]) + int(block_id)
return layer_id + 1
else:
return num_layers - 1
def get_finetune_param_groups(model, lr, weight_decay, get_layer_func, scales, skip_list=(), skip_keywords=()):
parameter_group_names = {}
parameter_group_vars = {}
for name, param in model.named_parameters():
if not param.requires_grad:
continue
if len(param.shape) == 1 or name.endswith(".bias") or (name in skip_list) or \
check_keywords_in_name(name, skip_keywords):
group_name = "no_decay"
this_weight_decay = 0.
else:
group_name = "decay"
this_weight_decay = weight_decay
if get_layer_func is not None:
layer_id = get_layer_func(name)
group_name = "layer_%d_%s" % (layer_id, group_name)
else:
layer_id = None
if group_name not in parameter_group_names:
if scales is not None:
scale = scales[layer_id]
else:
scale = 1.
parameter_group_names[group_name] = {
"group_name": group_name,
"weight_decay": this_weight_decay,
"params": [],
"lr": lr * scale,
"lr_scale": scale,
}
parameter_group_vars[group_name] = {
"group_name": group_name,
"weight_decay": this_weight_decay,
"params": [],
"lr": lr * scale,
"lr_scale": scale
}
parameter_group_vars[group_name]["params"].append(param)
parameter_group_names[group_name]["params"].append(name)
return list(parameter_group_vars.values())