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train_xception.py
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"""
Updated by Lin Xiong Sep-4, 2017
"""
import argparse,logging,os
import mxnet as mx
from symbol_xception import get_xception_symbol
logger = logging.getLogger()
logger.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s - %(message)s')
console = logging.StreamHandler()
console.setFormatter(formatter)
logger.addHandler(console)
def multi_factor_scheduler(begin_epoch, epoch_size, step=[20, 40, 60, 80, 90, 110], factor=0.1):
#def multi_factor_scheduler(begin_epoch, epoch_size, step=[15, 30, 45, 60, 75, 90, 115], factor=0.1):
step_ = [epoch_size * (x-begin_epoch) for x in step if x-begin_epoch > 0]
return mx.lr_scheduler.MultiFactorScheduler(step=step_, factor=factor) if len(step_) else None
def main():
if args.data_type == "cifar10":
args.aug_level = 1
args.num_classes = 10
symbol = get_xception_symbol(args.num_classes)
elif args.data_type == "imagenet":
args.num_classes = 1000
symbol = get_xception_symbol(args.num_classes)
else:
raise ValueError("do not support {} yet".format(args.data_type))
kv = mx.kvstore.create(args.kv_store)
devs = mx.cpu() if args.gpus is None else [mx.gpu(int(i)) for i in args.gpus.split(',')]
epoch_size = max(int(args.num_examples / args.batch_size / kv.num_workers), 1)
begin_epoch = args.model_load_epoch if args.model_load_epoch else 0
if not os.path.exists("./model"):
os.mkdir("./model")
model_prefix = "model/xception-{}-{}-{}".format(args.data_type, kv.rank, 0)
checkpoint = mx.callback.do_checkpoint(model_prefix)
arg_params = None
aux_params = None
if args.retrain:
_, arg_params, aux_params = mx.model.load_checkpoint(model_prefix, args.model_load_epoch)
if args.memonger:
import memonger
symbol = memonger.search_plan(symbol, data=(args.batch_size, 3, 32, 32) if args.data_type=="cifar10"
else (args.batch_size, 3, 224, 224))
train = mx.io.ImageRecordIter(
path_imgrec = os.path.join(args.data_dir, "train.rec") if args.data_type == 'cifar10' else
os.path.join(args.data_dir, "train_256_q90.rec") if args.aug_level == 1
else os.path.join(args.data_dir, "train_480_q90.rec") ,
label_width = 1,
data_name = 'data',
label_name = 'softmax_label',
data_shape = (3, 32, 32) if args.data_type=="cifar10" else (3, 224, 224),
batch_size = args.batch_size,
pad = 4 if args.data_type == "cifar10" else 0,
fill_value = 127, # only used when pad is valid
rand_crop = True,
max_random_scale = 1.0, # 480 with imagnet, 32 with cifar10
min_random_scale = 1.0 if args.data_type == "cifar10" else 1.0 if args.aug_level == 1 else 0.533, # 256.0/480.0=0.533, 256.0/384.0=0.667 256.0/256=1.0
max_aspect_ratio = 0 if args.data_type == "cifar10" else 0 if args.aug_level == 1 else 0.25, # 0.25
random_h = 0 if args.data_type == "cifar10" else 0 if args.aug_level == 1 else 36, # 0.4*90
random_s = 0 if args.data_type == "cifar10" else 0 if args.aug_level == 1 else 50, # 0.4*127
random_l = 0 if args.data_type == "cifar10" else 0 if args.aug_level == 1 else 50, # 0.4*127
max_rotate_angle = 0 if args.aug_level <= 2 else 10,
max_shear_ratio = 0 if args.aug_level <= 2 else 0.1, #0.1 args.aug_level = 3
rand_mirror = True,
shuffle = True,
num_parts = kv.num_workers,
part_index = kv.rank)
val = mx.io.ImageRecordIter(
path_imgrec = os.path.join(args.data_dir, "val.rec") if args.data_type == 'cifar10' else
os.path.join(args.data_dir, "val_256_q90.rec"),
label_width = 1,
data_name = 'data',
label_name = 'softmax_label',
batch_size = args.batch_size,
data_shape = (3, 32, 32) if args.data_type=="cifar10" else (3, 224, 224),
rand_crop = False,
rand_mirror = False,
num_parts = kv.num_workers,
part_index = kv.rank)
model = mx.model.FeedForward(
ctx = devs,
symbol = symbol,
arg_params = arg_params,
aux_params = aux_params,
num_epoch = 200 if args.data_type == "cifar10" else 125,
begin_epoch = begin_epoch,
learning_rate = args.lr,
momentum = args.mom,
wd = args.wd,
optimizer = 'nag',
# optimizer = 'sgd',
initializer = mx.init.Xavier(rnd_type='gaussian', factor_type="in", magnitude=2),
lr_scheduler = multi_factor_scheduler(begin_epoch, epoch_size, step=[220, 260, 280], factor=0.1)
if args.data_type=='cifar10' else
multi_factor_scheduler(begin_epoch, epoch_size, step=[20, 40, 60, 80, 90, 110], factor=0.1),
)
model.fit(
X = train,
eval_data = val,
eval_metric = ['acc'] if args.data_type=='cifar10' else
['acc', mx.metric.create('top_k_accuracy', top_k = 5)],
kvstore = kv,
batch_end_callback = mx.callback.Speedometer(args.batch_size, args.frequent),
epoch_end_callback = checkpoint)
# logging.info("top-1 and top-5 acc is {}".format(model.score(X = val,
# eval_metric = ['acc', mx.metric.create('top_k_accuracy', top_k = 5)])))
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="command for training xception network")
parser.add_argument('--gpus', type=str, default='0', help='the gpus will be used, e.g "0,1,2,3"')
parser.add_argument('--data-dir', type=str, default='./data/imagenet/', help='the input data directory')
parser.add_argument('--data-type', type=str, default='imagenet', help='the dataset type')
parser.add_argument('--list-dir', type=str, default='./',
help='the directory which contain the training list file')
parser.add_argument('--lr', type=float, default=0.1, help='initialization learning reate')
parser.add_argument('--mom', type=float, default=0.9, help='momentum for sgd')
parser.add_argument('--bn-mom', type=float, default=0.9, help='momentum for batch normlization')
parser.add_argument('--wd', type=float, default=0.0001, help='weight decay for sgd')
parser.add_argument('--batch-size', type=int, default=256, help='the batch size')
parser.add_argument('--workspace', type=int, default=512, help='memory space size(MB) used in convolution, if xpu '
' memory is oom, then you can try smaller vale, such as --workspace 256')
parser.add_argument('--num-classes', type=int, default=1000, help='the class number of your task')
parser.add_argument('--aug-level', type=int, default=2, choices=[1, 2, 3],
help='level 1: use only random crop and random mirror\n'
'level 2: add scale/aspect/hsv augmentation based on level 1\n'
'level 3: add rotation/shear augmentation based on level 2')
parser.add_argument('--num-examples', type=int, default=1281167, help='the number of training examples')
parser.add_argument('--kv-store', type=str, default='device', help='the kvstore type')
parser.add_argument('--model-load-epoch', type=int, default=0,
help='load the model on an epoch using the model-load-prefix')
parser.add_argument('--frequent', type=int, default=50, help='frequency of logging')
parser.add_argument('--memonger', action='store_true', default=False,
help='true means using memonger to save momory, https://github.com/dmlc/mxnet-memonger')
parser.add_argument('--retrain', action='store_true', default=False, help='true means continue training')
args = parser.parse_args()
hdlr = logging.FileHandler('./log/log-xecption-{}.log'.format(args.data_type))
hdlr.setFormatter(formatter)
logger.addHandler(hdlr)
logging.info(args)
main()