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optim_factory.py
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optim_factory.py
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# --------------------------------------------------------
# Based on BEiT, timm, DINO and DeiT code bases
# https://github.com/microsoft/unilm/tree/master/beit
# https://github.com/rwightman/pytorch-image-models/tree/master/timm
# https://github.com/facebookresearch/deit
# https://github.com/facebookresearch/dino
# --------------------------------------------------------'
import torch
from torch import optim as optim
from timm.optim.adafactor import Adafactor
from timm.optim.adahessian import Adahessian
from timm.optim.adamp import AdamP
from timm.optim.lookahead import Lookahead
from timm.optim.nadam import Nadam
#from timm.optim.novograd import NovoGrad
from timm.optim.nvnovograd import NvNovoGrad
from timm.optim.radam import RAdam
from timm.optim.rmsprop_tf import RMSpropTF
from timm.optim.sgdp import SGDP
import json
try:
from apex.optimizers import FusedNovoGrad, FusedAdam, FusedLAMB, FusedSGD
has_apex = True
except ImportError:
has_apex = False
def get_num_layer_for_vit(var_name, num_max_layer):
if var_name in ("cls_token", "mask_token", "pos_embed"):
return 0
elif var_name.startswith("patch_embed"):
return 0
elif var_name.startswith("rel_pos_bias"):
return num_max_layer - 1
elif var_name.startswith("encoder.transformer.blocks"):
layer_id = int(var_name.split('.')[3])
return layer_id + 1
else:
return num_max_layer - 1
class LayerDecayValueAssigner(object):
def __init__(self, values):
self.values = values
def get_scale(self, layer_id):
return self.values[layer_id]
def get_layer_id(self, var_name):
return get_num_layer_for_vit(var_name, len(self.values))
def get_parameter_groups(model, weight_decay=1e-5, skip_list=(), get_num_layer=None, get_layer_scale=None):
parameter_group_names = {}
parameter_group_vars = {}
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:
group_name = "no_decay"
this_weight_decay = 0.
else:
group_name = "decay"
this_weight_decay = weight_decay
if get_num_layer is not None:
layer_id = get_num_layer(name)
group_name = "layer_%d_%s" % (layer_id, group_name)
else:
layer_id = None
if group_name not in parameter_group_names:
if get_layer_scale is not None:
scale = get_layer_scale(layer_id)
else:
scale = 1.
parameter_group_names[group_name] = {
"weight_decay": this_weight_decay,
"params": [],
"lr_scale": scale
}
parameter_group_vars[group_name] = {
"weight_decay": this_weight_decay,
"params": [],
"lr_scale": scale
}
parameter_group_vars[group_name]["params"].append(param)
parameter_group_names[group_name]["params"].append(name)
print("Param groups = %s" % json.dumps(parameter_group_names, indent=2))
return list(parameter_group_vars.values())
def create_optimizer(args, model, get_num_layer=None, get_layer_scale=None, filter_bias_and_bn=True, skip_list=None):
opt_lower = args.opt.lower()
weight_decay = args.weight_decay
if weight_decay and filter_bias_and_bn:
skip = {}
if skip_list is not None:
skip = skip_list
elif hasattr(model, 'no_weight_decay'):
skip = model.no_weight_decay()
parameters = get_parameter_groups(model, weight_decay, skip, get_num_layer, get_layer_scale)
weight_decay = 0.
else:
parameters = model.parameters()
if 'fused' in opt_lower:
assert has_apex and torch.cuda.is_available(), 'APEX and CUDA required for fused optimizers'
opt_args = dict(lr=args.lr, weight_decay=weight_decay)
if hasattr(args, 'opt_eps') and args.opt_eps is not None:
opt_args['eps'] = args.opt_eps
if hasattr(args, 'opt_betas') and args.opt_betas is not None:
opt_args['betas'] = args.opt_betas
print("optimizer settings:", opt_args)
opt_split = opt_lower.split('_')
opt_lower = opt_split[-1]
if opt_lower == 'sgd' or opt_lower == 'nesterov':
opt_args.pop('eps', None)
optimizer = optim.SGD(parameters, momentum=args.momentum, nesterov=True, **opt_args)
elif opt_lower == 'momentum':
opt_args.pop('eps', None)
optimizer = optim.SGD(parameters, momentum=args.momentum, nesterov=False, **opt_args)
elif opt_lower == 'adam':
optimizer = optim.Adam(parameters, **opt_args)
elif opt_lower == 'adamw':
optimizer = optim.AdamW(parameters, **opt_args)
elif opt_lower == 'nadam':
optimizer = Nadam(parameters, **opt_args)
elif opt_lower == 'radam':
optimizer = RAdam(parameters, **opt_args)
elif opt_lower == 'adamp':
optimizer = AdamP(parameters, wd_ratio=0.01, nesterov=True, **opt_args)
elif opt_lower == 'sgdp':
optimizer = SGDP(parameters, momentum=args.momentum, nesterov=True, **opt_args)
elif opt_lower == 'adadelta':
optimizer = optim.Adadelta(parameters, **opt_args)
elif opt_lower == 'adafactor':
if not args.lr:
opt_args['lr'] = None
optimizer = Adafactor(parameters, **opt_args)
elif opt_lower == 'adahessian':
optimizer = Adahessian(parameters, **opt_args)
elif opt_lower == 'rmsprop':
optimizer = optim.RMSprop(parameters, alpha=0.9, momentum=args.momentum, **opt_args)
elif opt_lower == 'rmsproptf':
optimizer = RMSpropTF(parameters, alpha=0.9, momentum=args.momentum, **opt_args)
elif opt_lower == 'novograd':
optimizer = NovoGrad(parameters, **opt_args)
elif opt_lower == 'nvnovograd':
optimizer = NvNovoGrad(parameters, **opt_args)
elif opt_lower == 'fusedsgd':
opt_args.pop('eps', None)
optimizer = FusedSGD(parameters, momentum=args.momentum, nesterov=True, **opt_args)
elif opt_lower == 'fusedmomentum':
opt_args.pop('eps', None)
optimizer = FusedSGD(parameters, momentum=args.momentum, nesterov=False, **opt_args)
elif opt_lower == 'fusedadam':
optimizer = FusedAdam(parameters, adam_w_mode=False, **opt_args)
elif opt_lower == 'fusedadamw':
optimizer = FusedAdam(parameters, adam_w_mode=True, **opt_args)
elif opt_lower == 'fusedlamb':
optimizer = FusedLAMB(parameters, **opt_args)
elif opt_lower == 'fusednovograd':
opt_args.setdefault('betas', (0.95, 0.98))
optimizer = FusedNovoGrad(parameters, **opt_args)
else:
assert False and "Invalid optimizer"
raise ValueError
if len(opt_split) > 1:
if opt_split[0] == 'lookahead':
optimizer = Lookahead(optimizer)
return optimizer