def train(args):
'''Run training'''
# display chainer version
logging.info('chainer version = ' + chainer.__version__)
# seed setting (chainer seed may not need it)
os.environ['CHAINER_SEED'] = str(args.seed)
logging.info('chainer seed = ' + os.environ['CHAINER_SEED'])
# debug mode setting
# 0 would be fastest, but 1 seems to be reasonable
# by considering reproducability
# revmoe type check
if args.debugmode < 2:
chainer.config.type_check = False
logging.info('chainer type check is disabled')
# use determinisitic computation or not
if args.debugmode < 1:
chainer.config.cudnn_deterministic = False
logging.info('chainer cudnn deterministic is disabled')
else:
chainer.config.cudnn_deterministic = True
# check cuda and cudnn availability
if not chainer.cuda.available:
logging.warning('cuda is not available')
if not chainer.cuda.cudnn_enabled:
logging.warning('cudnn is not available')
# get input and output dimension info
with open(args.valid_json, 'rb') as f:
valid_json = json.load(f)['utts']
utts = list(valid_json.keys())
# TODO(nelson) remove in future
if 'input' not in valid_json[utts[0]]:
logging.error("input file format (json) is modified, please redo"
"stage 2: Dictionary and Json Data Preparation")
sys.exit(1)
idim = int(valid_json[utts[0]]['input'][0]['shape'][1])
odim = int(valid_json[utts[0]]['output'][0]['shape'][1])
logging.info('#input dims : ' + str(idim))
logging.info('#output dims: ' + str(odim))
# check attention type
if args.atype not in ['noatt', 'dot', 'location']:
raise NotImplementedError(
'chainer supports only noatt, dot, and location attention.')
# specify attention, CTC, hybrid mode
if args.mtlalpha == 1.0:
mtl_mode = 'ctc'
logging.info('Pure CTC mode')
elif args.mtlalpha == 0.0:
mtl_mode = 'att'
logging.info('Pure attention mode')
else:
mtl_mode = 'mtl'
logging.info('Multitask learning mode')
# specify model architecture
e2e = E2E(idim, odim, args)
model = Loss(e2e, args.mtlalpha)
# write model config
if not os.path.exists(args.outdir):
os.makedirs(args.outdir)
model_conf = args.outdir + '/model.conf'
with open(model_conf, 'wb') as f:
logging.info('writing a model config file to' + model_conf)
# TODO(watanabe) use others than pickle, possibly json, and save as a text
pickle.dump((idim, odim, args), f)
for key in sorted(vars(args).keys()):
logging.info('ARGS: ' + key + ': ' + str(vars(args)[key]))
# Set gpu
ngpu = args.ngpu
if ngpu == 1:
gpu_id = 0
# Make a specified GPU current
chainer.cuda.get_device_from_id(gpu_id).use()
model.to_gpu() # Copy the model to the GPU
logging.info('single gpu calculation.')
elif ngpu > 1:
gpu_id = 0
devices = {'main': gpu_id}
for gid in six.moves.xrange(1, ngpu):
devices['sub_%d' % gid] = gid
logging.info('multi gpu calculation (#gpus = %d).' % ngpu)
logging.info('batch size is automatically increased (%d -> %d)' %
(args.batch_size, args.batch_size * args.ngpu))
else:
gpu_id = -1
logging.info('cpu calculation')
# Setup an optimizer
if args.opt == 'adadelta':
optimizer = chainer.optimizers.AdaDelta(eps=args.eps)
elif args.opt == 'adam':
optimizer = chainer.optimizers.Adam()
optimizer.setup(model)
optimizer.add_hook(chainer.optimizer.GradientClipping(args.grad_clip))
# read json data
with open(args.train_json, 'rb') as f:
train_json = json.load(f)['utts']
with open(args.valid_json, 'rb') as f:
valid_json = json.load(f)['utts']
# set up training iterator and updater
if ngpu <= 1:
# make minibatch list (variable length)
train = make_batchset(train_json, args.batch_size, args.maxlen_in,
args.maxlen_out, args.minibatches)
# hack to make batchsize argument as 1
# actual batchsize is included in a list
train_iter = chainer.iterators.SerialIterator(train, 1)
# set up updater
updater = ChainerSeqUpdaterKaldi(train_iter,
optimizer,
converter=converter_kaldi,
device=gpu_id)
else:
# set up minibatches
train_subsets = []
for gid in six.moves.xrange(ngpu):
# make subset
train_json_subset = {
k: v
for i, (k, v) in enumerate(train_json.viewitems())
if i % ngpu == gid
}
# make minibatch list (variable length)
train_subsets += [
make_batchset(train_json_subset, args.batch_size,
args.maxlen_in, args.maxlen_out,
args.minibatches)
]
# each subset must have same length for MultiprocessParallelUpdater
maxlen = max([len(train_subset) for train_subset in train_subsets])
for train_subset in train_subsets:
if maxlen != len(train_subset):
for i in six.moves.xrange(maxlen - len(train_subset)):
train_subset += [train_subset[i]]
# hack to make batchsize argument as 1
# actual batchsize is included in a list
train_iters = [
chainer.iterators.MultiprocessIterator(train_subsets[gid],
1,
n_processes=1)
for gid in six.moves.xrange(ngpu)
]
# set up updater
updater = ChainerMultiProcessParallelUpdaterKaldi(
train_iters, optimizer, converter=converter_kaldi, devices=devices)
# Set up a trainer
trainer = training.Trainer(updater, (args.epochs, 'epoch'),
out=args.outdir)
# Resume from a snapshot
if args.resume:
chainer.serializers.load_npz(args.resume, trainer)
# set up validation iterator
valid = make_batchset(valid_json, args.batch_size, args.maxlen_in,
args.maxlen_out, args.minibatches)
valid_iter = chainer.iterators.SerialIterator(valid,
1,
repeat=False,
shuffle=False)
# Evaluate the model with the test dataset for each epoch
trainer.extend(
extensions.Evaluator(valid_iter,
model,
converter=converter_kaldi,
device=gpu_id))
# Save attention weight each epoch
if args.num_save_attention > 0 and args.mtlalpha != 1.0:
data = sorted(list(valid_json.items())[:args.num_save_attention],
key=lambda x: int(x[1]['input'][0]['shape'][1]),
reverse=True)
data = converter_kaldi([data], device=gpu_id)
trainer.extend(PlotAttentionReport(model, data,
args.outdir + "/att_ws"),
trigger=(1, 'epoch'))
# Take a snapshot for each specified epoch
trainer.extend(extensions.snapshot(), trigger=(1, 'epoch'))
# Make a plot for training and validation values
trainer.extend(
extensions.PlotReport([
'main/loss', 'validation/main/loss', 'main/loss_ctc',
'validation/main/loss_ctc', 'main/loss_att',
'validation/main/loss_att'
],
'epoch',
file_name='loss.png'))
trainer.extend(
extensions.PlotReport(['main/acc', 'validation/main/acc'],
'epoch',
file_name='acc.png'))
# Save best models
trainer.extend(
extensions.snapshot_object(model, 'model.loss.best'),
trigger=training.triggers.MinValueTrigger('validation/main/loss'))
if mtl_mode is not 'ctc':
trainer.extend(
extensions.snapshot_object(model, 'model.acc.best'),
trigger=training.triggers.MaxValueTrigger('validation/main/acc'))
# epsilon decay in the optimizer
if args.opt == 'adadelta':
if args.criterion == 'acc' and mtl_mode is not 'ctc':
trainer.extend(restore_snapshot(model,
args.outdir + '/model.acc.best'),
trigger=CompareValueTrigger(
'validation/main/acc', lambda best_value,
current_value: best_value > current_value))
trainer.extend(adadelta_eps_decay(args.eps_decay),
trigger=CompareValueTrigger(
'validation/main/acc', lambda best_value,
current_value: best_value > current_value))
elif args.criterion == 'loss':
trainer.extend(restore_snapshot(model,
args.outdir + '/model.loss.best'),
trigger=CompareValueTrigger(
'validation/main/loss', lambda best_value,
current_value: best_value < current_value))
trainer.extend(adadelta_eps_decay(args.eps_decay),
trigger=CompareValueTrigger(
'validation/main/loss', lambda best_value,
current_value: best_value < current_value))
# Write a log of evaluation statistics for each epoch
trainer.extend(extensions.LogReport(trigger=(100, 'iteration')))
report_keys = [
'epoch', 'iteration', 'main/loss', 'main/loss_ctc', 'main/loss_att',
'validation/main/loss', 'validation/main/loss_ctc',
'validation/main/loss_att', 'main/acc', 'validation/main/acc',
'elapsed_time'
]
if args.opt == 'adadelta':
trainer.extend(extensions.observe_value(
'eps', lambda trainer: trainer.updater.get_optimizer('main').eps),
trigger=(100, 'iteration'))
report_keys.append('eps')
trainer.extend(extensions.PrintReport(report_keys),
trigger=(100, 'iteration'))
trainer.extend(extensions.ProgressBar())
# Run the training
trainer.run()
def main():
parser = argparse.ArgumentParser()
# general configuration
parser.add_argument('--gpu',
'-g',
default='-1',
type=str,
help='GPU ID (negative value indicates CPU)')
parser.add_argument('--outdir',
type=str,
required=True,
help='Output directory')
parser.add_argument('--debugmode', default=1, type=int, help='Debugmode')
parser.add_argument('--dict', required=True, help='Dictionary')
parser.add_argument('--seed', default=1, type=int, help='Random seed')
parser.add_argument('--debugdir',
type=str,
help='Output directory for debugging')
parser.add_argument('--resume',
'-r',
default='',
nargs='?',
help='Resume the training from snapshot')
parser.add_argument('--minibatches',
'-N',
type=int,
default='-1',
help='Process only N minibatches (for debug)')
parser.add_argument('--verbose',
'-V',
default=0,
type=int,
help='Verbose option')
# task related
parser.add_argument('--train-feat',
type=str,
required=True,
help='Filename of train feature data (Kaldi scp)')
parser.add_argument('--valid-feat',
type=str,
required=True,
help='Filename of validation feature data (Kaldi scp)')
parser.add_argument('--train-label',
type=str,
required=True,
help='Filename of train label data (json)')
parser.add_argument('--valid-label',
type=str,
required=True,
help='Filename of validation label data (json)')
# network archtecture
# encoder
parser.add_argument('--etype',
default='blstmp',
type=str,
choices=['blstm', 'blstmp', 'vggblstmp', 'vggblstm'],
help='Type of encoder network architecture')
parser.add_argument('--elayers',
default=4,
type=int,
help='Number of encoder layers')
parser.add_argument('--eunits',
'-u',
default=300,
type=int,
help='Number of encoder hidden units')
parser.add_argument('--eprojs',
default=320,
type=int,
help='Number of encoder projection units')
parser.add_argument(
'--subsample',
default=1,
type=str,
help=
'Subsample input frames x_y_z means subsample every x frame at 1st layer, '
'every y frame at 2nd layer etc.')
# loss
parser.add_argument('--ctc_type',
default='chainer',
type=str,
choices=['chainer', 'warpctc'],
help='Type of CTC implementation to calculate loss.')
# attention
parser.add_argument('--atype',
default='dot',
type=str,
choices=['dot', 'location', 'noatt'],
help='Type of attention architecture')
parser.add_argument('--adim',
default=320,
type=int,
help='Number of attention transformation dimensions')
parser.add_argument('--aconv-chans',
default=-1,
type=int,
help='Number of attention convolution channels \
(negative value indicates no location-aware attention)'
)
parser.add_argument('--aconv-filts',
default=100,
type=int,
help='Number of attention convolution filters \
(negative value indicates no location-aware attention)'
)
# decoder
parser.add_argument('--dtype',
default='lstm',
type=str,
choices=['lstm'],
help='Type of decoder network architecture')
parser.add_argument('--dlayers',
default=1,
type=int,
help='Number of decoder layers')
parser.add_argument('--dunits',
default=320,
type=int,
help='Number of decoder hidden units')
parser.add_argument(
'--mtlalpha',
default=0.5,
type=float,
help=
'Multitask learning coefficient, alpha: alpha*ctc_loss + (1-alpha)*att_loss '
)
parser.add_argument(
'--lsm-type',
const='',
default='',
type=str,
nargs='?',
choices=['', 'unigram'],
help='Apply label smoothing with a specified distribution type')
parser.add_argument('--lsm-weight',
default=0.0,
type=float,
help='Label smoothing weight')
# model (parameter) related
parser.add_argument('--dropout-rate',
default=0.0,
type=float,
help='Dropout rate')
# minibatch related
parser.add_argument('--batch-size',
'-b',
default=50,
type=int,
help='Batch size')
parser.add_argument(
'--maxlen-in',
default=800,
type=int,
metavar='ML',
help='Batch size is reduced if the input sequence length > ML')
parser.add_argument(
'--maxlen-out',
default=150,
type=int,
metavar='ML',
help='Batch size is reduced if the output sequence length > ML')
# optimization related
parser.add_argument('--opt',
default='adadelta',
type=str,
choices=['adadelta', 'adam'],
help='Optimizer')
parser.add_argument('--eps',
default=1e-8,
type=float,
help='Epsilon constant for optimizer')
parser.add_argument('--eps-decay',
default=0.01,
type=float,
help='Decaying ratio of epsilon')
parser.add_argument('--criterion',
default='acc',
type=str,
choices=['loss', 'acc'],
help='Criterion to perform epsilon decay')
parser.add_argument('--threshold',
default=1e-4,
type=float,
help='Threshold to stop iteration')
parser.add_argument('--epochs',
'-e',
default=30,
type=int,
help='Number of maximum epochs')
parser.add_argument('--grad-clip',
default=5,
type=float,
help='Gradient norm threshold to clip')
args = parser.parse_args()
# logging info
if args.verbose > 0:
logging.basicConfig(
level=logging.INFO,
format=
'%(asctime)s (%(module)s:%(lineno)d) %(levelname)s: %(message)s')
else:
logging.basicConfig(
level=logging.WARN,
format=
'%(asctime)s (%(module)s:%(lineno)d) %(levelname)s: %(message)s')
logging.warning('Skip DEBUG/INFO messages')
# display PYTHONPATH
logging.info('python path = ' + os.environ['PYTHONPATH'])
# display chainer version
logging.info('chainer version = ' + chainer.__version__)
# seed setting (chainer seed may not need it)
nseed = args.seed
random.seed(nseed)
np.random.seed(nseed)
os.environ['CHAINER_SEED'] = str(nseed)
logging.info('chainer seed = ' + os.environ['CHAINER_SEED'])
# debug mode setting
# 0 would be fastest, but 1 seems to be reasonable
# by considering reproducability
# revmoe type check
if args.debugmode < 2:
chainer.config.type_check = False
logging.info('chainer type check is disabled')
# use determinisitic computation or not
if args.debugmode < 1:
chainer.config.cudnn_deterministic = False
logging.info('chainer cudnn deterministic is disabled')
else:
chainer.config.cudnn_deterministic = True
# load dictionary for debug log
if args.dict is not None:
with open(args.dict, 'rb') as f:
dictionary = f.readlines()
char_list = [
entry.decode('utf-8').split(' ')[0] for entry in dictionary
]
char_list.insert(0, '<blank>')
char_list.append('<eos>')
args.char_list = char_list
else:
args.char_list = None
# check cuda and cudnn availability
if not chainer.cuda.available:
logging.warning('cuda is not available')
if not chainer.cuda.cudnn_enabled:
logging.warning('cudnn is not available')
# get input and output dimension info
with open(args.valid_label, 'rb') as f:
valid_json = json.load(f)['utts']
utts = list(valid_json.keys())
idim = int(valid_json[utts[0]]['idim'])
odim = int(valid_json[utts[0]]['odim'])
logging.info('#input dims : ' + str(idim))
logging.info('#output dims: ' + str(odim))
# specify model architecture
e2e = E2E(idim, odim, args)
model = Loss(e2e, args.mtlalpha)
# write model config
if not os.path.exists(args.outdir):
os.makedirs(args.outdir)
model_conf = args.outdir + '/model.conf'
with open(model_conf, 'wb') as f:
logging.info('writing a model config file to' + model_conf)
# TODO(watanabe) use others than pickle, possibly json, and save as a text
pickle.dump((idim, odim, args), f)
for key in sorted(vars(args).keys()):
logging.info('ARGS: ' + key + ': ' + str(vars(args)[key]))
# Set gpu
gpu_id = int(args.gpu)
logging.info('gpu id: ' + str(gpu_id))
if gpu_id >= 0:
# Make a specified GPU current
chainer.cuda.get_device_from_id(gpu_id).use()
model.to_gpu() # Copy the model to the GPU
# Setup an optimizer
if args.opt == 'adadelta':
optimizer = chainer.optimizers.AdaDelta(eps=args.eps)
elif args.opt == 'adam':
optimizer = chainer.optimizers.Adam()
optimizer.setup(model)
optimizer.add_hook(chainer.optimizer.GradientClipping(args.grad_clip))
# read json data
with open(args.train_label, 'rb') as f:
train_json = json.load(f)['utts']
with open(args.valid_label, 'rb') as f:
valid_json = json.load(f)['utts']
# make minibatch list (variable length)
train = make_batchset(train_json, args.batch_size, args.maxlen_in,
args.maxlen_out, args.minibatches)
valid = make_batchset(valid_json, args.batch_size, args.maxlen_in,
args.maxlen_out, args.minibatches)
# hack to make batchsze argument as 1
# actual bathsize is included in a list
train_iter = chainer.iterators.SerialIterator(train, 1)
valid_iter = chainer.iterators.SerialIterator(valid,
1,
repeat=False,
shuffle=False)
# prepare Kaldi reader
train_reader = lazy_io.read_dict_scp(args.train_feat)
valid_reader = lazy_io.read_dict_scp(args.valid_feat)
# Set up a trainer
updater = SeqUpdaterKaldi(train_iter, optimizer, train_reader, gpu_id)
trainer = training.Trainer(updater, (args.epochs, 'epoch'),
out=args.outdir)
# Resume from a snapshot
if args.resume:
chainer.serializers.load_npz(args.resume, trainer)
# Evaluate the model with the test dataset for each epoch
trainer.extend(
SeqEvaluaterKaldi(valid_iter, model, valid_reader, device=gpu_id))
# Take a snapshot for each specified epoch
trainer.extend(extensions.snapshot(), trigger=(1, 'epoch'))
# Make a plot for training and validation values
trainer.extend(
extensions.PlotReport([
'main/loss', 'validation/main/loss', 'main/loss_ctc',
'validation/main/loss_ctc', 'main/loss_att',
'validation/main/loss_att'
],
'epoch',
file_name='loss.png'))
trainer.extend(
extensions.PlotReport(['main/acc', 'validation/main/acc'],
'epoch',
file_name='acc.png'))
# Save best models
trainer.extend(
extensions.snapshot_object(model, 'model.loss.best'),
trigger=training.triggers.MinValueTrigger('validation/main/loss'))
trainer.extend(
extensions.snapshot_object(model, 'model.acc.best'),
trigger=training.triggers.MaxValueTrigger('validation/main/acc'))
# epsilon decay in the optimizer
if args.opt == 'adadelta':
if args.criterion == 'acc':
trainer.extend(restore_snapshot(model,
args.outdir + '/model.acc.best'),
trigger=CompareValueTrigger(
'validation/main/acc', lambda best_value,
current_value: best_value > current_value))
trainer.extend(adadelta_eps_decay(args.eps_decay),
trigger=CompareValueTrigger(
'validation/main/acc', lambda best_value,
current_value: best_value > current_value))
elif args.criterion == 'loss':
trainer.extend(restore_snapshot(model,
args.outdir + '/model.loss.best'),
trigger=CompareValueTrigger(
'validation/main/loss', lambda best_value,
current_value: best_value < current_value))
trainer.extend(adadelta_eps_decay(args.eps_decay),
trigger=CompareValueTrigger(
'validation/main/loss', lambda best_value,
current_value: best_value < current_value))
# Write a log of evaluation statistics for each epoch
trainer.extend(extensions.LogReport(trigger=(100, 'iteration')))
report_keys = [
'epoch', 'iteration', 'main/loss', 'main/loss_ctc', 'main/loss_att',
'validation/main/loss', 'validation/main/loss_ctc',
'validation/main/loss_att', 'main/acc', 'validation/main/acc',
'elapsed_time'
]
if args.opt == 'adadelta':
trainer.extend(extensions.observe_value(
'eps', lambda trainer: trainer.updater.get_optimizer('main').eps),
trigger=(100, 'iteration'))
report_keys.append('eps')
trainer.extend(extensions.PrintReport(report_keys),
trigger=(100, 'iteration'))
trainer.extend(extensions.ProgressBar())
# Run the training
trainer.run()
def train(args):
'''Run training'''
# display chainer version
logging.info('chainer version = ' + chainer.__version__)
# seed setting (chainer seed may not need it)
os.environ['CHAINER_SEED'] = str(args.seed)
logging.info('chainer seed = ' + os.environ['CHAINER_SEED'])
# debug mode setting
# 0 would be fastest, but 1 seems to be reasonable
# by considering reproducability
# revmoe type check
if args.debugmode < 2:
chainer.config.type_check = False
logging.info('chainer type check is disabled')
# use determinisitic computation or not
if args.debugmode < 1:
chainer.config.cudnn_deterministic = False
logging.info('chainer cudnn deterministic is disabled')
else:
chainer.config.cudnn_deterministic = True
# check cuda and cudnn availability
if not chainer.cuda.available:
logging.warning('cuda is not available')
if not chainer.cuda.cudnn_enabled:
logging.warning('cudnn is not available')
# get input and output dimension info
with open(args.valid_label, 'rb') as f:
valid_json = json.load(f)['utts']
utts = list(valid_json.keys())
idim = int(valid_json[utts[0]]['idim'])
odim = int(valid_json[utts[0]]['odim'])
logging.info('#input dims : ' + str(idim))
logging.info('#output dims: ' + str(odim))
# check attention type
if args.atype not in ['noatt', 'dot', 'location']:
raise NotImplementedError(
'chainer supports only noatt, dot, and location attention.')
# specify model architecture
e2e = E2E(idim, odim, args)
model = Loss(e2e, args.mtlalpha)
# write model config
if not os.path.exists(args.outdir):
os.makedirs(args.outdir)
model_conf = args.outdir + '/model.conf'
with open(model_conf, 'wb') as f:
logging.info('writing a model config file to' + model_conf)
# TODO(watanabe) use others than pickle, possibly json, and save as a text
pickle.dump((idim, odim, args), f)
for key in sorted(vars(args).keys()):
logging.info('ARGS: ' + key + ': ' + str(vars(args)[key]))
# Set gpu
gpu_id = int(args.gpu)
logging.info('gpu id: ' + str(gpu_id))
if gpu_id >= 0:
# Make a specified GPU current
chainer.cuda.get_device_from_id(gpu_id).use()
model.to_gpu() # Copy the model to the GPU
# Setup an optimizer
if args.opt == 'adadelta':
optimizer = chainer.optimizers.AdaDelta(eps=args.eps)
elif args.opt == 'adam':
optimizer = chainer.optimizers.Adam()
optimizer.setup(model)
optimizer.add_hook(chainer.optimizer.GradientClipping(args.grad_clip))
# read json data
with open(args.train_label, 'rb') as f:
train_json = json.load(f)['utts']
with open(args.valid_label, 'rb') as f:
valid_json = json.load(f)['utts']
# make minibatch list (variable length)
train = make_batchset(train_json, args.batch_size, args.maxlen_in,
args.maxlen_out, args.minibatches)
valid = make_batchset(valid_json, args.batch_size, args.maxlen_in,
args.maxlen_out, args.minibatches)
# hack to make batchsze argument as 1
# actual bathsize is included in a list
train_iter = chainer.iterators.SerialIterator(train, 1)
valid_iter = chainer.iterators.SerialIterator(valid,
1,
repeat=False,
shuffle=False)
# prepare Kaldi reader
train_reader = lazy_io.read_dict_scp(args.train_feat)
valid_reader = lazy_io.read_dict_scp(args.valid_feat)
# Set up a trainer
updater = ChainerSeqUpdaterKaldi(train_iter, optimizer, train_reader,
gpu_id)
trainer = training.Trainer(updater, (args.epochs, 'epoch'),
out=args.outdir)
# Resume from a snapshot
if args.resume:
chainer.serializers.load_npz(args.resume, trainer)
# Evaluate the model with the test dataset for each epoch
trainer.extend(
ChainerSeqEvaluaterKaldi(valid_iter,
model,
valid_reader,
device=gpu_id))
# Take a snapshot for each specified epoch
trainer.extend(extensions.snapshot(), trigger=(1, 'epoch'))
# Make a plot for training and validation values
trainer.extend(
extensions.PlotReport([
'main/loss', 'validation/main/loss', 'main/loss_ctc',
'validation/main/loss_ctc', 'main/loss_att',
'validation/main/loss_att'
],
'epoch',
file_name='loss.png'))
trainer.extend(
extensions.PlotReport(['main/acc', 'validation/main/acc'],
'epoch',
file_name='acc.png'))
# Save best models
trainer.extend(
extensions.snapshot_object(model, 'model.loss.best'),
trigger=training.triggers.MinValueTrigger('validation/main/loss'))
trainer.extend(
extensions.snapshot_object(model, 'model.acc.best'),
trigger=training.triggers.MaxValueTrigger('validation/main/acc'))
# epsilon decay in the optimizer
if args.opt == 'adadelta':
if args.criterion == 'acc':
trainer.extend(restore_snapshot(model,
args.outdir + '/model.acc.best'),
trigger=CompareValueTrigger(
'validation/main/acc', lambda best_value,
current_value: best_value > current_value))
trainer.extend(adadelta_eps_decay(args.eps_decay),
trigger=CompareValueTrigger(
'validation/main/acc', lambda best_value,
current_value: best_value > current_value))
elif args.criterion == 'loss':
trainer.extend(restore_snapshot(model,
args.outdir + '/model.loss.best'),
trigger=CompareValueTrigger(
'validation/main/loss', lambda best_value,
current_value: best_value < current_value))
trainer.extend(adadelta_eps_decay(args.eps_decay),
trigger=CompareValueTrigger(
'validation/main/loss', lambda best_value,
current_value: best_value < current_value))
# Write a log of evaluation statistics for each epoch
trainer.extend(extensions.LogReport(trigger=(100, 'iteration')))
report_keys = [
'epoch', 'iteration', 'main/loss', 'main/loss_ctc', 'main/loss_att',
'validation/main/loss', 'validation/main/loss_ctc',
'validation/main/loss_att', 'main/acc', 'validation/main/acc',
'elapsed_time'
]
if args.opt == 'adadelta':
trainer.extend(extensions.observe_value(
'eps', lambda trainer: trainer.updater.get_optimizer('main').eps),
trigger=(100, 'iteration'))
report_keys.append('eps')
trainer.extend(extensions.PrintReport(report_keys),
trigger=(100, 'iteration'))
trainer.extend(extensions.ProgressBar())
# Run the training
trainer.run()