def train_one_iteration(dir,
iter,
srand,
egs_dir,
num_jobs,
num_archives_processed,
num_archives,
learning_rate,
shrinkage_value,
num_chunk_per_minibatch_str,
apply_deriv_weights,
min_deriv_time,
max_deriv_time_relative,
l2_regularize,
xent_regularize,
leaky_hmm_coefficient,
momentum,
max_param_change,
shuffle_buffer_size,
frame_subsampling_factor,
run_opts,
dropout_edit_string="",
backstitch_training_scale=0.0,
backstitch_training_interval=1):
""" Called from steps/nnet3/chain/train.py for one iteration for
neural network training with LF-MMI objective
"""
# Set off jobs doing some diagnostics, in the background.
# Use the egs dir from the previous iteration for the diagnostics
logger.info("Training neural net (pass {0})".format(iter))
# check if different iterations use the same random seed
if os.path.exists('{0}/srand'.format(dir)):
try:
saved_srand = int(open('{0}/srand'.format(dir)).readline().strip())
except (IOError, ValueError):
logger.error("Exception while reading the random seed "
"for training")
raise
if srand != saved_srand:
logger.warning("The random seed provided to this iteration "
"(srand={0}) is different from the one saved last "
"time (srand={1}). Using srand={0}.".format(
srand, saved_srand))
else:
with open('{0}/srand'.format(dir), 'w') as f:
f.write(str(srand))
# Sets off some background jobs to compute train and
# validation set objectives
compute_train_cv_probabilities(dir=dir,
iter=iter,
egs_dir=egs_dir,
l2_regularize=l2_regularize,
xent_regularize=xent_regularize,
leaky_hmm_coefficient=leaky_hmm_coefficient,
run_opts=run_opts)
if iter > 0:
# Runs in the background
compute_progress(dir, iter, run_opts)
do_average = (iter > 0)
raw_model_string = ("nnet3-am-copy --raw=true --learning-rate={0} "
"--scale={1} {2}/{3}.mdl - |".format(
learning_rate, shrinkage_value, dir, iter))
if do_average:
cur_num_chunk_per_minibatch_str = num_chunk_per_minibatch_str
cur_max_param_change = max_param_change
else:
# on iteration zero, use a smaller minibatch size (and we will later
# choose the output of just one of the jobs): the model-averaging isn't
# always helpful when the model is changing too fast (i.e. it can worsen
# the objective function), and the smaller minibatch size will help to
# keep the update stable.
cur_num_chunk_per_minibatch_str = common_train_lib.halve_minibatch_size_str(
num_chunk_per_minibatch_str)
cur_max_param_change = float(max_param_change) / math.sqrt(2)
raw_model_string = raw_model_string + dropout_edit_string
shrink_info_str = ''
if shrinkage_value != 1.0:
shrink_info_str = ' and shrink value is {0}'.format(shrinkage_value)
logger.info("On iteration {0}, learning rate is {1}"
"{shrink_info}.".format(iter,
learning_rate,
shrink_info=shrink_info_str))
train_new_models(
dir=dir,
iter=iter,
srand=srand,
num_jobs=num_jobs,
num_archives_processed=num_archives_processed,
num_archives=num_archives,
raw_model_string=raw_model_string,
egs_dir=egs_dir,
apply_deriv_weights=apply_deriv_weights,
min_deriv_time=min_deriv_time,
max_deriv_time_relative=max_deriv_time_relative,
l2_regularize=l2_regularize,
xent_regularize=xent_regularize,
leaky_hmm_coefficient=leaky_hmm_coefficient,
momentum=momentum,
max_param_change=cur_max_param_change,
shuffle_buffer_size=shuffle_buffer_size,
num_chunk_per_minibatch_str=cur_num_chunk_per_minibatch_str,
frame_subsampling_factor=frame_subsampling_factor,
run_opts=run_opts,
# linearly increase backstitch_training_scale during the
# first few iterations (hard-coded as 15)
backstitch_training_scale=(backstitch_training_scale * iter / 15 if
iter < 15 else backstitch_training_scale),
backstitch_training_interval=backstitch_training_interval)
[models_to_average, best_model] = common_train_lib.get_successful_models(
num_jobs, '{0}/log/train.{1}.%.log'.format(dir, iter))
nnets_list = []
for n in models_to_average:
nnets_list.append("{0}/{1}.{2}.raw".format(dir, iter + 1, n))
if do_average:
# average the output of the different jobs.
common_train_lib.get_average_nnet_model(
dir=dir,
iter=iter,
nnets_list=" ".join(nnets_list),
run_opts=run_opts)
else:
# choose the best model from different jobs
common_train_lib.get_best_nnet_model(dir=dir,
iter=iter,
best_model_index=best_model,
run_opts=run_opts)
try:
for i in range(1, num_jobs + 1):
os.remove("{0}/{1}.{2}.raw".format(dir, iter + 1, i))
except OSError:
raise Exception("Error while trying to delete the raw models")
new_model = "{0}/{1}.mdl".format(dir, iter + 1)
if not os.path.isfile(new_model):
raise Exception("Could not find {0}, at the end of "
"iteration {1}".format(new_model, iter))
elif os.stat(new_model).st_size == 0:
raise Exception("{0} has size 0. Something went wrong in "
"iteration {1}".format(new_model, iter))
if os.path.exists("{0}/cache.{1}".format(dir, iter)):
os.remove("{0}/cache.{1}".format(dir, iter))
def train_one_iteration(dir, iter, srand, egs_dir,
num_jobs, num_archives_processed, num_archives,
learning_rate, shrinkage_value,
num_chunk_per_minibatch,
num_hidden_layers, add_layers_period,
left_context, right_context,
apply_deriv_weights, min_deriv_time,
max_deriv_time,
l2_regularize, xent_regularize,
leaky_hmm_coefficient,
momentum, max_param_change, shuffle_buffer_size,
frame_subsampling_factor, truncate_deriv_weights,
run_opts,
dropout_edit_string="",
background_process_handler=None):
""" Called from steps/nnet3/chain/train.py for one iteration for
neural network training with LF-MMI objective
"""
# Set off jobs doing some diagnostics, in the background.
# Use the egs dir from the previous iteration for the diagnostics
logger.info("Training neural net (pass {0})".format(iter))
# check if different iterations use the same random seed
if os.path.exists('{0}/srand'.format(dir)):
try:
saved_srand = int(open('{0}/srand'.format(dir)).readline().strip())
except (IOError, ValueError):
logger.error("Exception while reading the random seed "
"for training")
raise
if srand != saved_srand:
logger.warning("The random seed provided to this iteration "
"(srand={0}) is different from the one saved last "
"time (srand={1}). Using srand={0}.".format(
srand, saved_srand))
else:
with open('{0}/srand'.format(dir), 'w') as f:
f.write(str(srand))
# Sets off some background jobs to compute train and
# validation set objectives
compute_train_cv_probabilities(
dir=dir, iter=iter, egs_dir=egs_dir,
left_context=left_context, right_context=right_context,
l2_regularize=l2_regularize, xent_regularize=xent_regularize,
leaky_hmm_coefficient=leaky_hmm_coefficient, run_opts=run_opts,
background_process_handler=background_process_handler)
if iter > 0:
# Runs in the background
compute_progress(dir, iter, run_opts,
background_process_handler=background_process_handler)
if (iter > 0 and (iter <= (num_hidden_layers-1) * add_layers_period)
and iter % add_layers_period == 0):
# if we've just added new hiden layer, don't do averaging but take the
# best.
do_average = False
cur_num_hidden_layers = 1 + iter / add_layers_period
config_file = "{0}/configs/layer{1}.config".format(
dir, cur_num_hidden_layers)
raw_model_string = ("nnet3-am-copy --raw=true --learning-rate={lr} "
"{dir}/{iter}.mdl - | nnet3-init --srand={srand} "
"- {config} - |".format(lr=learning_rate, dir=dir,
iter=iter,
srand=iter + srand,
config=config_file))
cache_io_opts = ""
else:
do_average = True
if iter == 0:
# on iteration 0, pick the best, don't average.
do_average = False
raw_model_string = ("nnet3-am-copy --raw=true --learning-rate={0} "
"{1}/{2}.mdl - |".format(learning_rate, dir, iter))
cache_io_opts = "--read-cache={dir}/cache.{iter}".format(dir=dir,
iter=iter)
if do_average:
cur_num_chunk_per_minibatch = num_chunk_per_minibatch
cur_max_param_change = max_param_change
else:
# on iteration zero or when we just added a layer, use a smaller
# minibatch size (and we will later choose the output of just one of
# the jobs): the model-averaging isn't always helpful when the model is
# changing too fast (i.e. it can worsen the objective function), and
# the smaller minibatch size will help to keep the update stable.
cur_num_chunk_per_minibatch = num_chunk_per_minibatch / 2
cur_max_param_change = float(max_param_change) / math.sqrt(2)
raw_model_string = '{0} {1}'.format(raw_model_string, dropout_edit_string)
shrink_info_str = ''
if shrinkage_value != 1.0:
shrink_info_str = ' and shrink value is {0}'.format(shrinkage_value)
logger.info("On iteration {0}, learning rate is {1}"
"{shrink_info}.".format(
iter, learning_rate,
shrink_info=shrink_info_str))
train_new_models(dir=dir, iter=iter, srand=srand, num_jobs=num_jobs,
num_archives_processed=num_archives_processed,
num_archives=num_archives,
raw_model_string=raw_model_string,
egs_dir=egs_dir,
left_context=left_context, right_context=right_context,
apply_deriv_weights=apply_deriv_weights,
min_deriv_time=min_deriv_time,
max_deriv_time=max_deriv_time,
l2_regularize=l2_regularize,
xent_regularize=xent_regularize,
leaky_hmm_coefficient=leaky_hmm_coefficient,
momentum=momentum,
max_param_change=cur_max_param_change,
shuffle_buffer_size=shuffle_buffer_size,
num_chunk_per_minibatch=cur_num_chunk_per_minibatch,
frame_subsampling_factor=frame_subsampling_factor,
truncate_deriv_weights=truncate_deriv_weights,
cache_io_opts=cache_io_opts, run_opts=run_opts)
[models_to_average, best_model] = common_train_lib.get_successful_models(
num_jobs, '{0}/log/train.{1}.%.log'.format(dir, iter))
nnets_list = []
for n in models_to_average:
nnets_list.append("{0}/{1}.{2}.raw".format(dir, iter + 1, n))
if do_average:
# average the output of the different jobs.
common_train_lib.get_average_nnet_model(
dir=dir, iter=iter,
nnets_list=" ".join(nnets_list),
run_opts=run_opts,
shrink=shrinkage_value)
else:
# choose the best model from different jobs
common_train_lib.get_best_nnet_model(
dir=dir, iter=iter,
best_model_index=best_model,
run_opts=run_opts,
shrink=shrinkage_value)
try:
for i in range(1, num_jobs + 1):
os.remove("{0}/{1}.{2}.raw".format(dir, iter + 1, i))
except OSError:
raise Exception("Error while trying to delete the raw models")
new_model = "{0}/{1}.mdl".format(dir, iter + 1)
if not os.path.isfile(new_model):
raise Exception("Could not find {0}, at the end of "
"iteration {1}".format(new_model, iter))
elif os.stat(new_model).st_size == 0:
raise Exception("{0} has size 0. Something went wrong in "
"iteration {1}".format(new_model, iter))
if os.path.exists("{0}/cache.{1}".format(dir, iter)):
os.remove("{0}/cache.{1}".format(dir, iter))
def train_one_iteration(dir,
iter,
srand,
egs_dir,
num_jobs,
num_archives_processed,
num_archives,
learning_rate,
minibatch_size_str,
momentum,
max_param_change,
shuffle_buffer_size,
run_opts,
image_augmentation_opts=None,
frames_per_eg=-1,
min_deriv_time=None,
max_deriv_time_relative=None,
shrinkage_value=1.0,
dropout_edit_string="",
get_raw_nnet_from_am=True,
use_multitask_egs=False,
backstitch_training_scale=0.0,
backstitch_training_interval=1,
compute_per_dim_accuracy=False):
""" Called from steps/nnet3/train_*.py scripts for one iteration of neural
network training
Selected args:
frames_per_eg: The default value -1 implies chunk_level_training, which
is particularly applicable to RNN training. If it is > 0, then it
implies frame-level training, which is applicable for DNN training.
If it is > 0, then each parallel SGE job created, a different frame
numbered 0..frames_per_eg-1 is used.
shrinkage_value: If value is 1.0, no shrinkage is done; otherwise
parameter values are scaled by this value.
get_raw_nnet_from_am: If True, then the network is read and stored as
acoustic model i.e. along with transition model e.g. 10.mdl
as against a raw network e.g. 10.raw when the value is False.
"""
# Set off jobs doing some diagnostics, in the background.
# Use the egs dir from the previous iteration for the diagnostics
logger.info("Training neural net (pass {0})".format(iter))
# check if different iterations use the same random seed
if os.path.exists('{0}/srand'.format(dir)):
try:
saved_srand = int(open('{0}/srand'.format(dir)).readline().strip())
except (IOError, ValueError):
logger.error("Exception while reading the random seed "
"for training")
raise
if srand != saved_srand:
logger.warning("The random seed provided to this iteration "
"(srand={0}) is different from the one saved last "
"time (srand={1}). Using srand={0}.".format(
srand, saved_srand))
else:
with open('{0}/srand'.format(dir), 'w') as f:
f.write(str(srand))
# Sets off some background jobs to compute train and
# validation set objectives
compute_train_cv_probabilities(
dir=dir,
iter=iter,
egs_dir=egs_dir,
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am,
use_multitask_egs=use_multitask_egs,
compute_per_dim_accuracy=compute_per_dim_accuracy)
if iter > 0:
# Runs in the background
compute_progress(dir=dir,
iter=iter,
egs_dir=egs_dir,
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am)
do_average = (iter > 0)
raw_model_string = ("nnet3-copy --learning-rate={lr} --scale={s} "
"{dir}/{iter}.{suf} - |".format(
lr=learning_rate,
s=shrinkage_value,
suf="mdl" if get_raw_nnet_from_am else "raw",
dir=dir,
iter=iter))
raw_model_string = raw_model_string + dropout_edit_string
if do_average:
cur_minibatch_size_str = minibatch_size_str
cur_max_param_change = max_param_change
else:
# on iteration zero, use a smaller minibatch size (and we will later
# choose the output of just one of the jobs): the model-averaging isn't
# always helpful when the model is changing too fast (i.e. it can worsen
# the objective function), and the smaller minibatch size will help to
# keep the update stable.
cur_minibatch_size_str = common_train_lib.halve_minibatch_size_str(
minibatch_size_str)
cur_max_param_change = float(max_param_change) / math.sqrt(2)
shrink_info_str = ''
if shrinkage_value != 1.0:
shrink_info_str = ' and shrink value is {0}'.format(shrinkage_value)
logger.info("On iteration {0}, learning rate is {1}"
"{shrink_info}.".format(iter,
learning_rate,
shrink_info=shrink_info_str))
train_new_models(dir=dir,
iter=iter,
srand=srand,
num_jobs=num_jobs,
num_archives_processed=num_archives_processed,
num_archives=num_archives,
raw_model_string=raw_model_string,
egs_dir=egs_dir,
momentum=momentum,
max_param_change=cur_max_param_change,
shuffle_buffer_size=shuffle_buffer_size,
minibatch_size_str=cur_minibatch_size_str,
run_opts=run_opts,
frames_per_eg=frames_per_eg,
min_deriv_time=min_deriv_time,
max_deriv_time_relative=max_deriv_time_relative,
image_augmentation_opts=image_augmentation_opts,
use_multitask_egs=use_multitask_egs,
backstitch_training_scale=backstitch_training_scale,
backstitch_training_interval=backstitch_training_interval)
[models_to_average, best_model] = common_train_lib.get_successful_models(
num_jobs, '{0}/log/train.{1}.%.log'.format(dir, iter))
nnets_list = []
for n in models_to_average:
nnets_list.append("{0}/{1}.{2}.raw".format(dir, iter + 1, n))
if do_average:
# average the output of the different jobs.
common_train_lib.get_average_nnet_model(
dir=dir,
iter=iter,
nnets_list=" ".join(nnets_list),
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am)
else:
# choose the best model from different jobs
common_train_lib.get_best_nnet_model(
dir=dir,
iter=iter,
best_model_index=best_model,
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am)
try:
for i in range(1, num_jobs + 1):
os.remove("{0}/{1}.{2}.raw".format(dir, iter + 1, i))
except OSError:
logger.error("Error while trying to delete the raw models")
raise
if get_raw_nnet_from_am:
new_model = "{0}/{1}.mdl".format(dir, iter + 1)
else:
new_model = "{0}/{1}.raw".format(dir, iter + 1)
if not os.path.isfile(new_model):
raise Exception("Could not find {0}, at the end of "
"iteration {1}".format(new_model, iter))
elif os.stat(new_model).st_size == 0:
raise Exception("{0} has size 0. Something went wrong in "
"iteration {1}".format(new_model, iter))
if os.path.exists("{0}/cache.{1}".format(dir, iter)):
os.remove("{0}/cache.{1}".format(dir, iter))
def train_one_iteration(dir, iter, srand, egs_dir,
num_jobs, num_archives_processed, num_archives,
learning_rate, shrinkage_value,
num_chunk_per_minibatch_str,
apply_deriv_weights, min_deriv_time,
max_deriv_time_relative,
l2_regularize, xent_regularize,
leaky_hmm_coefficient,
momentum, max_param_change, shuffle_buffer_size,
frame_subsampling_factor,
run_opts, dropout_edit_string="", train_opts="",
backstitch_training_scale=0.0, backstitch_training_interval=1,
use_multitask_egs=False):
""" Called from steps/nnet3/chain/train.py for one iteration for
neural network training with LF-MMI objective
"""
# Set off jobs doing some diagnostics, in the background.
# Use the egs dir from the previous iteration for the diagnostics
# check if different iterations use the same random seed
if os.path.exists('{0}/srand'.format(dir)):
try:
saved_srand = int(open('{0}/srand'.format(dir)).readline().strip())
except (IOError, ValueError):
logger.error("Exception while reading the random seed "
"for training")
raise
if srand != saved_srand:
logger.warning("The random seed provided to this iteration "
"(srand={0}) is different from the one saved last "
"time (srand={1}). Using srand={0}.".format(
srand, saved_srand))
else:
with open('{0}/srand'.format(dir), 'w') as f:
f.write(str(srand))
# Sets off some background jobs to compute train and
# validation set objectives
compute_train_cv_probabilities(
dir=dir, iter=iter, egs_dir=egs_dir,
l2_regularize=l2_regularize, xent_regularize=xent_regularize,
leaky_hmm_coefficient=leaky_hmm_coefficient, run_opts=run_opts,
use_multitask_egs=use_multitask_egs)
if iter > 0:
# Runs in the background
compute_progress(dir, iter, run_opts)
do_average = (iter > 0)
raw_model_string = ("nnet3-am-copy --raw=true --learning-rate={0} "
"--scale={1} {2}/{3}.mdl - |".format(
learning_rate, shrinkage_value, dir, iter))
if do_average:
cur_num_chunk_per_minibatch_str = num_chunk_per_minibatch_str
cur_max_param_change = max_param_change
else:
# on iteration zero, use a smaller minibatch size (and we will later
# choose the output of just one of the jobs): the model-averaging isn't
# always helpful when the model is changing too fast (i.e. it can worsen
# the objective function), and the smaller minibatch size will help to
# keep the update stable.
cur_num_chunk_per_minibatch_str = common_train_lib.halve_minibatch_size_str(
num_chunk_per_minibatch_str)
cur_max_param_change = float(max_param_change) / math.sqrt(2)
raw_model_string = raw_model_string + dropout_edit_string
train_new_models(dir=dir, iter=iter, srand=srand, num_jobs=num_jobs,
num_archives_processed=num_archives_processed,
num_archives=num_archives,
raw_model_string=raw_model_string,
egs_dir=egs_dir,
apply_deriv_weights=apply_deriv_weights,
min_deriv_time=min_deriv_time,
max_deriv_time_relative=max_deriv_time_relative,
l2_regularize=l2_regularize,
xent_regularize=xent_regularize,
leaky_hmm_coefficient=leaky_hmm_coefficient,
momentum=momentum,
max_param_change=cur_max_param_change,
shuffle_buffer_size=shuffle_buffer_size,
num_chunk_per_minibatch_str=cur_num_chunk_per_minibatch_str,
frame_subsampling_factor=frame_subsampling_factor,
run_opts=run_opts, train_opts=train_opts,
# linearly increase backstitch_training_scale during the
# first few iterations (hard-coded as 15)
backstitch_training_scale=(backstitch_training_scale *
iter / 15 if iter < 15 else backstitch_training_scale),
backstitch_training_interval=backstitch_training_interval,
use_multitask_egs=use_multitask_egs)
[models_to_average, best_model] = common_train_lib.get_successful_models(
num_jobs, '{0}/log/train.{1}.%.log'.format(dir, iter))
nnets_list = []
for n in models_to_average:
nnets_list.append("{0}/{1}.{2}.raw".format(dir, iter + 1, n))
if do_average:
# average the output of the different jobs.
common_train_lib.get_average_nnet_model(
dir=dir, iter=iter,
nnets_list=" ".join(nnets_list),
run_opts=run_opts)
else:
# choose the best model from different jobs
common_train_lib.get_best_nnet_model(
dir=dir, iter=iter,
best_model_index=best_model,
run_opts=run_opts)
try:
for i in range(1, num_jobs + 1):
os.remove("{0}/{1}.{2}.raw".format(dir, iter + 1, i))
except OSError:
raise Exception("Error while trying to delete the raw models")
new_model = "{0}/{1}.mdl".format(dir, iter + 1)
if not os.path.isfile(new_model):
raise Exception("Could not find {0}, at the end of "
"iteration {1}".format(new_model, iter))
elif os.stat(new_model).st_size == 0:
raise Exception("{0} has size 0. Something went wrong in "
"iteration {1}".format(new_model, iter))
if os.path.exists("{0}/cache.{1}".format(dir, iter)):
os.remove("{0}/cache.{1}".format(dir, iter))
def train_one_iteration(dir, iter, srand, egs_dir,
num_jobs, num_archives_processed, num_archives,
learning_rate, minibatch_size_str,
momentum, max_param_change, shuffle_buffer_size,
run_opts, image_augmentation_opts=None,
frames_per_eg=-1,
min_deriv_time=None, max_deriv_time_relative=None,
shrinkage_value=1.0, dropout_edit_string="",
get_raw_nnet_from_am=True,
use_multitask_egs=False,
backstitch_training_scale=0.0, backstitch_training_interval=1):
""" Called from steps/nnet3/train_*.py scripts for one iteration of neural
network training
Selected args:
frames_per_eg: The default value -1 implies chunk_level_training, which
is particularly applicable to RNN training. If it is > 0, then it
implies frame-level training, which is applicable for DNN training.
If it is > 0, then each parallel SGE job created, a different frame
numbered 0..frames_per_eg-1 is used.
shrinkage_value: If value is 1.0, no shrinkage is done; otherwise
parameter values are scaled by this value.
get_raw_nnet_from_am: If True, then the network is read and stored as
acoustic model i.e. along with transition model e.g. 10.mdl
as against a raw network e.g. 10.raw when the value is False.
"""
# Set off jobs doing some diagnostics, in the background.
# Use the egs dir from the previous iteration for the diagnostics
logger.info("Training neural net (pass {0})".format(iter))
# check if different iterations use the same random seed
if os.path.exists('{0}/srand'.format(dir)):
try:
saved_srand = int(open('{0}/srand'.format(dir)).readline().strip())
except (IOError, ValueError):
logger.error("Exception while reading the random seed "
"for training")
raise
if srand != saved_srand:
logger.warning("The random seed provided to this iteration "
"(srand={0}) is different from the one saved last "
"time (srand={1}). Using srand={0}.".format(
srand, saved_srand))
else:
with open('{0}/srand'.format(dir), 'w') as f:
f.write(str(srand))
# Sets off some background jobs to compute train and
# validation set objectives
compute_train_cv_probabilities(
dir=dir, iter=iter, egs_dir=egs_dir,
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am,
use_multitask_egs=use_multitask_egs)
if iter > 0:
# Runs in the background
compute_progress(dir=dir, iter=iter, egs_dir=egs_dir,
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am,
use_multitask_egs=use_multitask_egs)
do_average = (iter > 0)
if get_raw_nnet_from_am:
raw_model_string = ("nnet3-am-copy --raw=true --learning-rate={0} "
"--scale={1} {2}/{3}.mdl - |".format(
learning_rate, shrinkage_value,
dir, iter))
else:
raw_model_string = ("nnet3-copy --learning-rate={lr} --scale={s} "
"{dir}/{iter}.raw - |".format(
lr=learning_rate, s=shrinkage_value,
dir=dir, iter=iter))
raw_model_string = raw_model_string + dropout_edit_string
if do_average:
cur_minibatch_size_str = minibatch_size_str
cur_max_param_change = max_param_change
else:
# on iteration zero, use a smaller minibatch size (and we will later
# choose the output of just one of the jobs): the model-averaging isn't
# always helpful when the model is changing too fast (i.e. it can worsen
# the objective function), and the smaller minibatch size will help to
# keep the update stable.
cur_minibatch_size_str = common_train_lib.halve_minibatch_size_str(minibatch_size_str)
cur_max_param_change = float(max_param_change) / math.sqrt(2)
shrink_info_str = ''
if shrinkage_value != 1.0:
shrink_info_str = ' and shrink value is {0}'.format(shrinkage_value)
logger.info("On iteration {0}, learning rate is {1}"
"{shrink_info}.".format(
iter, learning_rate,
shrink_info=shrink_info_str))
train_new_models(dir=dir, iter=iter, srand=srand, num_jobs=num_jobs,
num_archives_processed=num_archives_processed,
num_archives=num_archives,
raw_model_string=raw_model_string, egs_dir=egs_dir,
momentum=momentum, max_param_change=cur_max_param_change,
shuffle_buffer_size=shuffle_buffer_size,
minibatch_size_str=cur_minibatch_size_str,
run_opts=run_opts,
frames_per_eg=frames_per_eg,
min_deriv_time=min_deriv_time,
max_deriv_time_relative=max_deriv_time_relative,
image_augmentation_opts=image_augmentation_opts,
use_multitask_egs=use_multitask_egs,
backstitch_training_scale=backstitch_training_scale,
backstitch_training_interval=backstitch_training_interval)
[models_to_average, best_model] = common_train_lib.get_successful_models(
num_jobs, '{0}/log/train.{1}.%.log'.format(dir, iter))
nnets_list = []
for n in models_to_average:
nnets_list.append("{0}/{1}.{2}.raw".format(dir, iter + 1, n))
if do_average:
# average the output of the different jobs.
common_train_lib.get_average_nnet_model(
dir=dir, iter=iter,
nnets_list=" ".join(nnets_list),
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am)
else:
# choose the best model from different jobs
common_train_lib.get_best_nnet_model(
dir=dir, iter=iter,
best_model_index=best_model,
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am)
try:
for i in range(1, num_jobs + 1):
os.remove("{0}/{1}.{2}.raw".format(dir, iter + 1, i))
except OSError:
logger.error("Error while trying to delete the raw models")
raise
if get_raw_nnet_from_am:
new_model = "{0}/{1}.mdl".format(dir, iter + 1)
else:
new_model = "{0}/{1}.raw".format(dir, iter + 1)
if not os.path.isfile(new_model):
raise Exception("Could not find {0}, at the end of "
"iteration {1}".format(new_model, iter))
elif os.stat(new_model).st_size == 0:
raise Exception("{0} has size 0. Something went wrong in "
"iteration {1}".format(new_model, iter))
if os.path.exists("{0}/cache.{1}".format(dir, iter)):
os.remove("{0}/cache.{1}".format(dir, iter))
def train_one_iteration(dir,
iter,
srand,
egs_dir,
num_jobs,
num_archives_processed,
num_archives,
learning_rate,
minibatch_size,
num_hidden_layers,
add_layers_period,
left_context,
right_context,
momentum,
max_param_change,
shuffle_buffer_size,
run_opts,
cv_minibatch_size=256,
frames_per_eg=-1,
min_deriv_time=None,
max_deriv_time=None,
shrinkage_value=1.0,
get_raw_nnet_from_am=True,
background_process_handler=None):
""" Called from steps/nnet3/train_*.py scripts for one iteration of neural
network training
Args:
frames_per_eg: The default value -1 implies chunk_level_training, which
is particularly applicable to RNN training. If it is > 0, then it
implies frame-level training, which is applicable for DNN training.
If it is > 0, then each parallel SGE job created, a different frame
numbered 0..frames_per_eg-1 is used.
min_deriv_time: Applicable for RNN training. A default value of None
implies a min_deriv_time of 0 is used. During RNN training, its
value is set to chunk_width - num_bptt_steps in the training
script.
shrinkage_value: If value is 1.0, no shrinkage is done; otherwise
parameter values are scaled by this value.
get_raw_nnet_from_am: If True, then the network is read and stored as
acoustic model i.e. along with transition model e.g. 10.mdl
as against a raw network e.g. 10.raw when the value is False.
"""
# Set off jobs doing some diagnostics, in the background.
# Use the egs dir from the previous iteration for the diagnostics
logger.info("Training neural net (pass {0})".format(iter))
# check if different iterations use the same random seed
if os.path.exists('{0}/srand'.format(dir)):
try:
saved_srand = int(open('{0}/srand'.format(dir)).readline().strip())
except (IOError, ValueError):
logger.error("Exception while reading the random seed "
"for training")
raise
if srand != saved_srand:
logger.warning("The random seed provided to this iteration "
"(srand={0}) is different from the one saved last "
"time (srand={1}). Using srand={0}.".format(
srand, saved_srand))
else:
with open('{0}/srand'.format(dir), 'w') as f:
f.write(str(srand))
# Sets off some background jobs to compute train and
# validation set objectives
compute_train_cv_probabilities(
dir=dir,
iter=iter,
egs_dir=egs_dir,
left_context=left_context,
right_context=right_context,
run_opts=run_opts,
mb_size=cv_minibatch_size,
get_raw_nnet_from_am=get_raw_nnet_from_am,
wait=False,
background_process_handler=background_process_handler)
if iter > 0:
# Runs in the background
compute_progress(dir=dir,
iter=iter,
egs_dir=egs_dir,
left_context=left_context,
right_context=right_context,
run_opts=run_opts,
mb_size=cv_minibatch_size,
wait=False,
get_raw_nnet_from_am=get_raw_nnet_from_am,
background_process_handler=background_process_handler)
# an option for writing cache (storing pairs of nnet-computations
# and computation-requests) during training.
cache_read_opt = ""
if (iter > 0 and (iter <= (num_hidden_layers - 1) * add_layers_period)
and iter % add_layers_period == 0):
# if we've just added new hiden layer, don't do averaging but take the
# best.
do_average = False
cur_num_hidden_layers = 1 + iter / add_layers_period
config_file = "{0}/configs/layer{1}.config".format(
dir, cur_num_hidden_layers)
if get_raw_nnet_from_am:
raw_model_string = ("nnet3-am-copy --raw=true "
"--learning-rate={lr} {dir}/{iter}.mdl - | "
"nnet3-init --srand={srand} - "
"{config} - |".format(lr=learning_rate,
dir=dir,
iter=iter,
srand=iter + srand,
config=config_file))
else:
raw_model_string = ("nnet3-copy --learning-rate={lr} "
"{dir}/{iter}.raw - | "
"nnet3-init --srand={srand} - "
"{config} - |".format(lr=learning_rate,
dir=dir,
iter=iter,
srand=iter + srand,
config=config_file))
else:
do_average = True
if iter == 0:
# on iteration 0, pick the best, don't average.
do_average = False
else:
cache_read_opt = "--read-cache={dir}/cache.{iter}".format(
dir=dir, iter=iter)
if get_raw_nnet_from_am:
raw_model_string = ("nnet3-am-copy --raw=true --learning-rate={0} "
"{1}/{2}.mdl - |".format(
learning_rate, dir, iter))
else:
raw_model_string = ("nnet3-copy --learning-rate={lr} "
"{dir}/{iter}.raw - |".format(lr=learning_rate,
dir=dir,
iter=iter))
if do_average:
cur_minibatch_size = minibatch_size
cur_max_param_change = max_param_change
else:
# on iteration zero or when we just added a layer, use a smaller
# minibatch size (and we will later choose the output of just one of
# the jobs): the model-averaging isn't always helpful when the model is
# changing too fast (i.e. it can worsen the objective function), and
# the smaller minibatch size will help to keep the update stable.
cur_minibatch_size = minibatch_size / 2
cur_max_param_change = float(max_param_change) / math.sqrt(2)
try:
os.remove("{0}/.error".format(dir))
except OSError:
pass
train_new_models(dir=dir,
iter=iter,
srand=srand,
num_jobs=num_jobs,
num_archives_processed=num_archives_processed,
num_archives=num_archives,
raw_model_string=raw_model_string,
egs_dir=egs_dir,
left_context=left_context,
right_context=right_context,
momentum=momentum,
max_param_change=cur_max_param_change,
shuffle_buffer_size=shuffle_buffer_size,
minibatch_size=cur_minibatch_size,
cache_read_opt=cache_read_opt,
run_opts=run_opts,
frames_per_eg=frames_per_eg,
min_deriv_time=min_deriv_time,
max_deriv_time=max_deriv_time)
[models_to_average, best_model] = common_train_lib.get_successful_models(
num_jobs, '{0}/log/train.{1}.%.log'.format(dir, iter))
nnets_list = []
for n in models_to_average:
nnets_list.append("{0}/{1}.{2}.raw".format(dir, iter + 1, n))
if do_average:
# average the output of the different jobs.
common_train_lib.get_average_nnet_model(
dir=dir,
iter=iter,
nnets_list=" ".join(nnets_list),
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am,
shrink=shrinkage_value)
else:
# choose the best model from different jobs
common_train_lib.get_best_nnet_model(
dir=dir,
iter=iter,
best_model_index=best_model,
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am,
shrink=shrinkage_value)
try:
for i in range(1, num_jobs + 1):
os.remove("{0}/{1}.{2}.raw".format(dir, iter + 1, i))
except OSError:
logger.error("Error while trying to delete the raw models")
raise
if get_raw_nnet_from_am:
new_model = "{0}/{1}.mdl".format(dir, iter + 1)
else:
new_model = "{0}/{1}.raw".format(dir, iter + 1)
if not os.path.isfile(new_model):
raise Exception("Could not find {0}, at the end of "
"iteration {1}".format(new_model, iter))
elif os.stat(new_model).st_size == 0:
raise Exception("{0} has size 0. Something went wrong in "
"iteration {1}".format(new_model, iter))
if cache_read_opt and os.path.exists("{0}/cache.{1}".format(dir, iter)):
os.remove("{0}/cache.{1}".format(dir, iter))
def train_one_iteration(dir, iter, srand, egs_dir,
num_jobs, num_archives_processed, num_archives,
learning_rate, minibatch_size,
num_hidden_layers, add_layers_period,
left_context, right_context,
momentum, max_param_change, shuffle_buffer_size,
run_opts,
cv_minibatch_size=256, frames_per_eg=-1,
min_deriv_time=None, max_deriv_time=None,
shrinkage_value=1.0,
get_raw_nnet_from_am=True,
background_process_handler=None):
""" Called from steps/nnet3/train_*.py scripts for one iteration of neural
network training
Args:
frames_per_eg: The default value -1 implies chunk_level_training, which
is particularly applicable to RNN training. If it is > 0, then it
implies frame-level training, which is applicable for DNN training.
If it is > 0, then each parallel SGE job created, a different frame
numbered 0..frames_per_eg-1 is used.
min_deriv_time: Applicable for RNN training. A default value of None
implies a min_deriv_time of 0 is used. During RNN training, its
value is set to chunk_width - num_bptt_steps in the training
script.
shrinkage_value: If value is 1.0, no shrinkage is done; otherwise
parameter values are scaled by this value.
get_raw_nnet_from_am: If True, then the network is read and stored as
acoustic model i.e. along with transition model e.g. 10.mdl
as against a raw network e.g. 10.raw when the value is False.
"""
# Set off jobs doing some diagnostics, in the background.
# Use the egs dir from the previous iteration for the diagnostics
logger.info("Training neural net (pass {0})".format(iter))
# check if different iterations use the same random seed
if os.path.exists('{0}/srand'.format(dir)):
try:
saved_srand = int(open('{0}/srand'.format(dir)).readline().strip())
except (IOError, ValueError) as e:
raise Exception("Exception while reading the random seed "
"for training: {0}".format(e.str()))
if srand != saved_srand:
logger.warning("The random seed provided to this iteration "
"(srand={0}) is different from the one saved last "
"time (srand={1}). Using srand={0}.".format(
srand, saved_srand))
else:
with open('{0}/srand'.format(dir), 'w') as f:
f.write(str(srand))
# Sets off some background jobs to compute train and
# validation set objectives
compute_train_cv_probabilities(
dir=dir, iter=iter, egs_dir=egs_dir,
left_context=left_context, right_context=right_context,
run_opts=run_opts,
mb_size=cv_minibatch_size,
get_raw_nnet_from_am=get_raw_nnet_from_am, wait=False,
background_process_handler=background_process_handler)
if iter > 0:
# Runs in the background
compute_progress(dir=dir, iter=iter, egs_dir=egs_dir,
left_context=left_context,
right_context=right_context,
run_opts=run_opts,
mb_size=cv_minibatch_size, wait=False,
get_raw_nnet_from_am=get_raw_nnet_from_am,
background_process_handler=background_process_handler)
# an option for writing cache (storing pairs of nnet-computations
# and computation-requests) during training.
cache_read_opt = ""
if (iter > 0 and (iter <= (num_hidden_layers-1) * add_layers_period)
and iter % add_layers_period == 0):
# if we've just added new hiden layer, don't do averaging but take the
# best.
do_average = False
cur_num_hidden_layers = 1 + iter / add_layers_period
config_file = "{0}/configs/layer{1}.config".format(
dir, cur_num_hidden_layers)
if get_raw_nnet_from_am:
raw_model_string = ("nnet3-am-copy --raw=true "
"--learning-rate={lr} {dir}/{iter}.mdl - | "
"nnet3-init --srand={srand} - "
"{config} - |".format(
lr=learning_rate, dir=dir, iter=iter,
srand=iter + srand, config=config_file))
else:
raw_model_string = ("nnet3-copy --learning-rate={lr} "
"{dir}/{iter}.raw - | "
"nnet3-init --srand={srand} - "
"{config} - |".format(
lr=learning_rate, dir=dir, iter=iter,
srand=iter + srand, config=config_file))
else:
do_average = True
if iter == 0:
# on iteration 0, pick the best, don't average.
do_average = False
else:
cache_read_opt = "--read-cache={dir}/cache.{iter}".format(
dir=dir, iter=iter)
if get_raw_nnet_from_am:
raw_model_string = ("nnet3-am-copy --raw=true --learning-rate={0} "
"{1}/{2}.mdl - |".format(learning_rate,
dir, iter))
else:
raw_model_string = ("nnet3-copy --learning-rate={lr} "
"{dir}/{iter}.raw - |".format(
lr=learning_rate, dir=dir, iter=iter))
if do_average:
cur_minibatch_size = minibatch_size
cur_max_param_change = max_param_change
else:
# on iteration zero or when we just added a layer, use a smaller
# minibatch size (and we will later choose the output of just one of
# the jobs): the model-averaging isn't always helpful when the model is
# changing too fast (i.e. it can worsen the objective function), and
# the smaller minibatch size will help to keep the update stable.
cur_minibatch_size = minibatch_size / 2
cur_max_param_change = float(max_param_change) / math.sqrt(2)
try:
os.remove("{0}/.error".format(dir))
except OSError:
pass
train_new_models(dir=dir, iter=iter, srand=srand, num_jobs=num_jobs,
num_archives_processed=num_archives_processed,
num_archives=num_archives,
raw_model_string=raw_model_string, egs_dir=egs_dir,
left_context=left_context, right_context=right_context,
momentum=momentum, max_param_change=cur_max_param_change,
shuffle_buffer_size=shuffle_buffer_size,
minibatch_size=cur_minibatch_size,
cache_read_opt=cache_read_opt, run_opts=run_opts,
frames_per_eg=frames_per_eg,
min_deriv_time=min_deriv_time,
max_deriv_time=max_deriv_time)
[models_to_average, best_model] = common_train_lib.get_successful_models(
num_jobs, '{0}/log/train.{1}.%.log'.format(dir, iter))
nnets_list = []
for n in models_to_average:
nnets_list.append("{0}/{1}.{2}.raw".format(dir, iter + 1, n))
if do_average:
# average the output of the different jobs.
common_train_lib.get_average_nnet_model(
dir=dir, iter=iter,
nnets_list=" ".join(nnets_list),
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am,
shrink=shrinkage_value)
else:
# choose the best model from different jobs
common_train_lib.get_best_nnet_model(
dir=dir, iter=iter,
best_model_index=best_model,
run_opts=run_opts,
get_raw_nnet_from_am=get_raw_nnet_from_am,
shrink=shrinkage_value)
try:
for i in range(1, num_jobs + 1):
os.remove("{0}/{1}.{2}.raw".format(dir, iter + 1, i))
except OSError:
raise Exception("Error while trying to delete the raw models")
if get_raw_nnet_from_am:
new_model = "{0}/{1}.mdl".format(dir, iter + 1)
else:
new_model = "{0}/{1}.raw".format(dir, iter + 1)
if not os.path.isfile(new_model):
raise Exception("Could not find {0}, at the end of "
"iteration {1}".format(new_model, iter))
elif os.stat(new_model).st_size == 0:
raise Exception("{0} has size 0. Something went wrong in "
"iteration {1}".format(new_model, iter))
if cache_read_opt and os.path.exists("{0}/cache.{1}".format(dir, iter)):
os.remove("{0}/cache.{1}".format(dir, iter))