def main():
archs = {
'alex': alex.Alex,
'googlenet': googlenet.GoogLeNet,
'googlenetbn': googlenetbn.GoogLeNetBN,
'nin': nin.NIN,
'resnet50': resnet50.ResNet50,
'resnext50': resnext50.ResNeXt50,
}
dtypes = {
'float16': np.float16,
'float32': np.float32,
'float64': np.float64,
}
parser = argparse.ArgumentParser(
description='Learning convnet from ILSVRC2012 dataset')
parser.add_argument('train', help='Path to training image-label list file')
parser.add_argument('val', help='Path to validation image-label list file')
parser.add_argument('--arch',
'-a',
choices=archs.keys(),
default='nin',
help='Convnet architecture')
parser.add_argument('--batchsize',
'-B',
type=int,
default=32,
help='Learning minibatch size')
parser.add_argument('--dtype',
choices=dtypes,
help='Specify the dtype '
'used. If not supplied, the default dtype is used')
parser.add_argument('--epoch',
'-E',
type=int,
default=10,
help='Number of epochs to train')
parser.add_argument('--device',
'-d',
type=str,
default='-1',
help='Device specifier. Either ChainerX device '
'specifier or an integer. If non-negative integer, '
'CuPy arrays with specified device id are used. If '
'negative integer, NumPy arrays are used')
parser.add_argument('--initmodel',
help='Initialize the model from given file')
parser.add_argument('--loaderjob',
'-j',
type=int,
help='Number of parallel data loading processes')
parser.add_argument('--mean',
'-m',
default='mean.npy',
help='Mean file (computed by compute_mean.py)')
parser.add_argument('--resume',
'-r',
default='',
help='Initialize the trainer from given file')
parser.add_argument('--out',
'-o',
default='result',
help='Output directory')
parser.add_argument('--root',
'-R',
default='.',
help='Root directory path of image files')
parser.add_argument('--val_batchsize',
'-b',
type=int,
default=250,
help='Validation minibatch size')
parser.add_argument('--test', action='store_true')
parser.set_defaults(test=False)
parser.add_argument('--dali', action='store_true')
parser.set_defaults(dali=False)
group = parser.add_argument_group('deprecated arguments')
group.add_argument('--gpu',
'-g',
dest='device',
type=int,
nargs='?',
const=0,
help='GPU ID (negative value indicates CPU)')
args = parser.parse_args()
device = chainer.get_device(args.device)
# Set the dtype if supplied.
if args.dtype is not None:
chainer.config.dtype = args.dtype
print('Device: {}'.format(device))
print('Dtype: {}'.format(chainer.config.dtype))
print('# Minibatch-size: {}'.format(args.batchsize))
print('# epoch: {}'.format(args.epoch))
print('')
# Initialize the model to train
model = archs[args.arch]()
if args.initmodel:
print('Load model from {}'.format(args.initmodel))
chainer.serializers.load_npz(args.initmodel, model)
model.to_device(device)
device.use()
# Load the mean file
mean = np.load(args.mean)
if args.dali:
if not dali_util._dali_available:
raise RuntimeError('DALI seems not available on your system.')
if device.xp is not chainer.backend.cuda.cupy:
raise RuntimeError('Using DALI requires GPU device. Please '
'specify it with --device option.')
num_threads = args.loaderjob
if num_threads is None or num_threads <= 0:
num_threads = 1
ch_mean = list(np.average(mean, axis=(1, 2)))
ch_std = [255.0, 255.0, 255.0]
# Setup DALI pipelines
train_pipe = dali_util.DaliPipelineTrain(args.train,
args.root,
model.insize,
args.batchsize,
num_threads,
device.device.id,
True,
mean=ch_mean,
std=ch_std)
val_pipe = dali_util.DaliPipelineVal(args.val,
args.root,
model.insize,
args.val_batchsize,
num_threads,
device.device.id,
False,
mean=ch_mean,
std=ch_std)
train_iter = chainer.iterators.DaliIterator(train_pipe)
val_iter = chainer.iterators.DaliIterator(val_pipe, repeat=False)
# converter = dali_converter
converter = dali_util.DaliConverter(mean=mean, crop_size=model.insize)
else:
# Load the dataset files
train = PreprocessedDataset(args.train, args.root, mean, model.insize)
val = PreprocessedDataset(args.val, args.root, mean, model.insize,
False)
# These iterators load the images with subprocesses running in parallel
# to the training/validation.
train_iter = chainer.iterators.MultiprocessIterator(
train, args.batchsize, n_processes=args.loaderjob)
val_iter = chainer.iterators.MultiprocessIterator(
val, args.val_batchsize, repeat=False, n_processes=args.loaderjob)
converter = dataset.concat_examples
# Set up an optimizer
optimizer = chainer.optimizers.MomentumSGD(lr=0.01, momentum=0.9)
optimizer.setup(model)
# Set up a trainer
updater = training.updaters.StandardUpdater(train_iter,
optimizer,
converter=converter,
device=device)
trainer = training.Trainer(updater, (args.epoch, 'epoch'), args.out)
val_interval = (100000, 'iteration')
log_interval = (1000, 'iteration')
if args.test:
val_interval = (1, 'iteration')
log_interval = (1, 'iteration')
trainer.extend(extensions.Evaluator(val_iter,
model,
converter=converter,
device=device),
trigger=val_interval)
# TODO(sonots): Temporarily disabled for chainerx. Fix it.
if device.xp is not chainerx:
trainer.extend(extensions.DumpGraph('main/loss'))
trainer.extend(extensions.snapshot(), trigger=val_interval)
trainer.extend(extensions.snapshot_object(
model, 'model_iter_{.updater.iteration}'),
trigger=val_interval)
# Be careful to pass the interval directly to LogReport
# (it determines when to emit log rather than when to read observations)
trainer.extend(extensions.LogReport(trigger=log_interval))
trainer.extend(extensions.observe_lr(), trigger=log_interval)
trainer.extend(extensions.PrintReport([
'epoch', 'iteration', 'main/loss', 'validation/main/loss',
'main/accuracy', 'validation/main/accuracy', 'lr'
]),
trigger=log_interval)
trainer.extend(extensions.ProgressBar(update_interval=10))
if args.resume:
chainer.serializers.load_npz(args.resume, trainer)
trainer.run()
def main():
archs = {
'alex': alex.Alex,
'googlenet': googlenet.GoogLeNet,
'googlenetbn': googlenetbn.GoogLeNetBN,
'nin': nin.NIN,
'resnet50': resnet50.ResNet50,
'resnext50': resnext50.ResNeXt50,
}
parser = argparse.ArgumentParser(
description='Learning convnet from ILSVRC2012 dataset')
parser.add_argument('train', help='Path to training image-label list file')
parser.add_argument('val', help='Path to validation image-label list file')
parser.add_argument('--arch', '-a', choices=archs.keys(),
default='nin', help='Convnet architecture')
parser.add_argument('--batchsize', '-B', type=int, default=32,
help='Learning minibatch size')
parser.add_argument('--epoch', '-E', type=int, default=10,
help='Number of epochs to train')
parser.add_argument('--devices', '-d', type=str, nargs='*',
default=['0', '1', '2', '3'],
help='Device specifiers. Either ChainerX device '
'specifiers or integers. If non-negative integer, '
'CuPy arrays with specified device id are used. If '
'negative integer, NumPy arrays are used')
parser.add_argument('--initmodel',
help='Initialize the model from given file')
parser.add_argument('--loaderjob', '-j', type=int,
help='Number of parallel data loading processes')
parser.add_argument('--mean', '-m', default='mean.npy',
help='Mean file (computed by compute_mean.py)')
parser.add_argument('--resume', '-r', default='',
help='Initialize the trainer from given file')
parser.add_argument('--out', '-o', default='result',
help='Output directory')
parser.add_argument('--root', '-R', default='.',
help='Root directory path of image files')
parser.add_argument('--val_batchsize', '-b', type=int, default=250,
help='Validation minibatch size')
parser.add_argument('--test', action='store_true')
parser.set_defaults(test=False)
group = parser.add_argument_group('deprecated arguments')
group.add_argument('--gpus', '-g', dest='devices',
type=int, nargs='?', const=0,
help='GPU IDs (negative value indicates CPU)')
args = parser.parse_args()
devices = tuple([chainer.get_device(d) for d in args.devices])
if any(device.xp is chainerx for device in devices):
sys.stderr.write('This example does not support ChainerX devices.\n')
sys.exit(1)
# Initialize the model to train
model = archs[args.arch]()
if args.initmodel:
print('Load model from {}'.format(args.initmodel))
chainer.serializers.load_npz(args.initmodel, model)
# Load the datasets and mean file
mean = np.load(args.mean)
train = PreprocessedDataset(
args.train, args.root, mean, model.insize)
val = PreprocessedDataset(
args.val, args.root, mean, model.insize, False)
# These iterators load the images with subprocesses running in parallel to
# the training/validation.
train_iters = [
chainer.iterators.MultiprocessIterator(i,
args.batchsize,
n_processes=args.loaderjob)
for i in chainer.datasets.split_dataset_n_random(train, len(devices))]
val_iter = chainer.iterators.MultiprocessIterator(
val, args.val_batchsize, repeat=False, n_processes=args.loaderjob)
# Set up an optimizer
optimizer = chainer.optimizers.MomentumSGD(lr=0.01, momentum=0.9)
optimizer.setup(model)
# Set up a trainer
updater = updaters.MultiprocessParallelUpdater(train_iters, optimizer,
devices=devices)
trainer = training.Trainer(updater, (args.epoch, 'epoch'), args.out)
if args.test:
val_interval = 5, 'epoch'
log_interval = 1, 'epoch'
else:
val_interval = 100000, 'iteration'
log_interval = 1000, 'iteration'
trainer.extend(extensions.Evaluator(val_iter, model, device=devices[0]),
trigger=val_interval)
trainer.extend(extensions.DumpGraph('main/loss'))
trainer.extend(extensions.snapshot(), trigger=val_interval)
trainer.extend(extensions.snapshot_object(
model, 'model_iter_{.updater.iteration}'), trigger=val_interval)
# Be careful to pass the interval directly to LogReport
# (it determines when to emit log rather than when to read observations)
trainer.extend(extensions.LogReport(trigger=log_interval))
trainer.extend(extensions.observe_lr(), trigger=log_interval)
trainer.extend(extensions.PrintReport([
'epoch', 'iteration', 'main/loss', 'validation/main/loss',
'main/accuracy', 'validation/main/accuracy', 'lr'
]), trigger=log_interval)
trainer.extend(extensions.ProgressBar(update_interval=2))
if args.resume:
chainer.serializers.load_npz(args.resume, trainer)
trainer.run()