def train(args, run_opts):
""" The main function for training.
Args:
args: a Namespace object with the required parameters
obtained from the function process_args()
run_opts: RunOpts object obtained from the process_args()
"""
arg_string = pprint.pformat(vars(args))
logger.info("Arguments for the experiment\n{0}".format(arg_string))
# Copy phones.txt from ali-dir to dir. Later, steps/nnet3/decode.sh will
# use it to check compatibility between training and decoding phone-sets.
shutil.copy('{0}/phones.txt'.format(args.ali_dir), args.dir)
# Set some variables.
num_jobs = common_lib.get_number_of_jobs(args.ali_dir)
feat_dim = common_lib.get_feat_dim(args.feat_dir)
ivector_dim = common_lib.get_ivector_dim(args.online_ivector_dir)
ivector_id = common_lib.get_ivector_extractor_id(args.online_ivector_dir)
# split the training data into parts for individual jobs
# we will use the same number of jobs as that used for alignment
common_lib.execute_command("utils/split_data.sh {0} {1}".format(
args.feat_dir, num_jobs))
shutil.copy('{0}/tree'.format(args.ali_dir), args.dir)
with open('{0}/num_jobs'.format(args.dir), 'w') as f:
f.write('{}'.format(num_jobs))
config_dir = '{0}/configs'.format(args.dir)
var_file = '{0}/vars'.format(config_dir)
if args.input_model is None:
config_dir = '{0}/configs'.format(args.dir)
var_file = '{0}/vars'.format(config_dir)
variables = common_train_lib.parse_generic_config_vars_file(var_file)
else:
# If args.input_model is specified, the model left and right contexts
# are computed using input_model.
variables = common_train_lib.get_input_model_info(args.input_model)
# Set some variables.
try:
model_left_context = variables['model_left_context']
model_right_context = variables['model_right_context']
except KeyError as e:
raise Exception("KeyError {0}: Variables need to be defined in "
"{1}".format(str(e), '{0}/configs'.format(args.dir)))
left_context = args.chunk_left_context + model_left_context
right_context = args.chunk_right_context + model_right_context
left_context_initial = (args.chunk_left_context_initial + model_left_context if
args.chunk_left_context_initial >= 0 else -1)
right_context_final = (args.chunk_right_context_final + model_right_context if
args.chunk_right_context_final >= 0 else -1)
# Initialize as "raw" nnet, prior to training the LDA-like preconditioning
# matrix. This first config just does any initial splicing that we do;
# we do this as it's a convenient way to get the stats for the 'lda-like'
# transform.
if (args.stage <= -5) and (args.input_model is None):
logger.info("Initializing a basic network for estimating "
"preconditioning matrix")
common_lib.execute_command(
"""{command} {dir}/log/nnet_init.log \
nnet3-init --srand=-2 {dir}/configs/init.config \
{dir}/init.raw""".format(command=run_opts.command,
dir=args.dir))
default_egs_dir = '{0}/egs'.format(args.dir)
if args.stage <= -4 and args.egs_dir is None:
logger.info("Generating egs")
if args.feat_dir is None:
raise Exception("--feat-dir option is required if you don't supply --egs-dir")
train_lib.acoustic_model.generate_egs(
data=args.feat_dir, alidir=args.ali_dir,
egs_dir=default_egs_dir,
left_context=left_context,
right_context=right_context,
left_context_initial=left_context_initial,
right_context_final=right_context_final,
run_opts=run_opts,
frames_per_eg_str=args.chunk_width,
srand=args.srand,
egs_opts=args.egs_opts,
cmvn_opts=args.cmvn_opts,
online_ivector_dir=args.online_ivector_dir,
samples_per_iter=args.samples_per_iter,
stage=args.egs_stage)
if args.egs_dir is None:
egs_dir = default_egs_dir
else:
egs_dir = args.egs_dir
[egs_left_context, egs_right_context,
frames_per_eg_str, num_archives] = (
common_train_lib.verify_egs_dir(egs_dir, feat_dim,
ivector_dim, ivector_id,
left_context, right_context,
left_context_initial, right_context_final))
if args.chunk_width != frames_per_eg_str:
raise Exception("mismatch between --egs.chunk-width and the frames_per_eg "
"in the egs dir {0} vs {1}".format(args.chunk_width,
frames_per_eg_str))
if args.num_jobs_final > num_archives:
raise Exception('num_jobs_final cannot exceed the number of archives '
'in the egs directory')
# copy the properties of the egs to dir for
# use during decoding
common_train_lib.copy_egs_properties_to_exp_dir(egs_dir, args.dir)
if args.stage <= -3 and (args.input_model is None):
logger.info('Computing the preconditioning matrix for input features')
train_lib.common.compute_preconditioning_matrix(
args.dir, egs_dir, num_archives, run_opts,
max_lda_jobs=args.max_lda_jobs,
rand_prune=args.rand_prune)
if args.stage <= -2 and (args.input_model is None):
logger.info("Computing initial vector for FixedScaleComponent before"
" softmax, using priors^{prior_scale} and rescaling to"
" average 1".format(
prior_scale=args.presoftmax_prior_scale_power))
common_train_lib.compute_presoftmax_prior_scale(
args.dir, args.ali_dir, num_jobs, run_opts,
presoftmax_prior_scale_power=args.presoftmax_prior_scale_power)
if args.stage <= -1:
logger.info("Preparing the initial acoustic model.")
train_lib.acoustic_model.prepare_initial_acoustic_model(
args.dir, args.ali_dir, run_opts,
input_model=args.input_model)
# set num_iters so that as close as possible, we process the data
# $num_epochs times, i.e. $num_iters*$avg_num_jobs) ==
# $num_epochs*$num_archives, where
# avg_num_jobs=(num_jobs_initial+num_jobs_final)/2.
num_archives_to_process = int(args.num_epochs * num_archives)
num_archives_processed = 0
num_iters = int((num_archives_to_process * 2) / (args.num_jobs_initial + args.num_jobs_final))
# If do_final_combination is True, compute the set of models_to_combine.
# Otherwise, models_to_combine will be none.
if args.do_final_combination:
models_to_combine = common_train_lib.get_model_combine_iters(
num_iters, args.num_epochs,
num_archives, args.max_models_combine,
args.num_jobs_final)
else:
models_to_combine = None
min_deriv_time = None
max_deriv_time_relative = None
if args.deriv_truncate_margin is not None:
min_deriv_time = -args.deriv_truncate_margin - model_left_context
max_deriv_time_relative = \
args.deriv_truncate_margin + model_right_context
logger.info("Training will run for {0} epochs = "
"{1} iterations".format(args.num_epochs, num_iters))
for iter in range(num_iters):
if (args.exit_stage is not None) and (iter == args.exit_stage):
logger.info("Exiting early due to --exit-stage {0}".format(iter))
return
current_num_jobs = int(0.5 + args.num_jobs_initial
+ (args.num_jobs_final - args.num_jobs_initial)
* float(iter) / num_iters)
if args.stage <= iter:
model_file = "{dir}/{iter}.mdl".format(dir=args.dir, iter=iter)
lrate = common_train_lib.get_learning_rate(iter, current_num_jobs,
num_iters,
num_archives_processed,
num_archives_to_process,
args.initial_effective_lrate,
args.final_effective_lrate)
shrinkage_value = 1.0 - (args.proportional_shrink * lrate)
if shrinkage_value <= 0.5:
raise Exception("proportional-shrink={0} is too large, it gives "
"shrink-value={1}".format(args.proportional_shrink,
shrinkage_value))
if args.shrink_value < shrinkage_value:
shrinkage_value = (args.shrink_value
if common_train_lib.should_do_shrinkage(
iter, model_file,
args.shrink_saturation_threshold) else 1.0)
percent = num_archives_processed * 100.0 / num_archives_to_process
epoch = (num_archives_processed * args.num_epochs
/ num_archives_to_process)
shrink_info_str = ''
if shrinkage_value != 1.0:
shrink_info_str = 'shrink: {0:0.5f}'.format(shrinkage_value)
logger.info("Iter: {0}/{1} "
"Epoch: {2:0.2f}/{3:0.1f} ({4:0.1f}% complete) "
"lr: {5:0.6f} {6}".format(iter, num_iters - 1,
epoch, args.num_epochs,
percent,
lrate, shrink_info_str))
train_lib.common.train_one_iteration(
dir=args.dir,
iter=iter,
srand=args.srand,
egs_dir=egs_dir,
num_jobs=current_num_jobs,
num_archives_processed=num_archives_processed,
num_archives=num_archives,
learning_rate=lrate,
dropout_edit_string=common_train_lib.get_dropout_edit_string(
args.dropout_schedule,
float(num_archives_processed) / num_archives_to_process,
iter),
train_opts=' '.join(args.train_opts),
shrinkage_value=shrinkage_value,
minibatch_size_str=args.num_chunk_per_minibatch,
min_deriv_time=min_deriv_time,
max_deriv_time_relative=max_deriv_time_relative,
momentum=args.momentum,
max_param_change=args.max_param_change,
shuffle_buffer_size=args.shuffle_buffer_size,
run_opts=run_opts,
backstitch_training_scale=args.backstitch_training_scale,
backstitch_training_interval=args.backstitch_training_interval,
compute_per_dim_accuracy=args.compute_per_dim_accuracy)
if args.cleanup:
# do a clean up everythin but the last 2 models, under certain
# conditions
common_train_lib.remove_model(
args.dir, iter-2, num_iters, models_to_combine,
args.preserve_model_interval)
if args.email is not None:
reporting_iter_interval = num_iters * args.reporting_interval
if iter % reporting_iter_interval == 0:
# lets do some reporting
[report, times, data] = (
nnet3_log_parse.generate_acc_logprob_report(args.dir))
message = report
subject = ("Update : Expt {dir} : "
"Iter {iter}".format(dir=args.dir, iter=iter))
common_lib.send_mail(message, subject, args.email)
num_archives_processed = num_archives_processed + current_num_jobs
if args.stage <= num_iters:
if args.do_final_combination:
logger.info("Doing final combination to produce final.mdl")
train_lib.common.combine_models(
dir=args.dir, num_iters=num_iters,
models_to_combine=models_to_combine, egs_dir=egs_dir,
run_opts=run_opts,
minibatch_size_str=args.num_chunk_per_minibatch,
chunk_width=args.chunk_width,
max_objective_evaluations=args.max_objective_evaluations,
compute_per_dim_accuracy=args.compute_per_dim_accuracy)
if args.stage <= num_iters + 1:
logger.info("Getting average posterior for purposes of "
"adjusting the priors.")
# If args.do_final_combination is true, we will use the combined model.
# Otherwise, we will use the last_numbered model.
real_iter = 'combined' if args.do_final_combination else num_iters
avg_post_vec_file = train_lib.common.compute_average_posterior(
dir=args.dir, iter=real_iter, egs_dir=egs_dir,
num_archives=num_archives,
prior_subset_size=args.prior_subset_size, run_opts=run_opts)
logger.info("Re-adjusting priors based on computed posteriors")
combined_or_last_numbered_model = "{dir}/{iter}.mdl".format(dir=args.dir,
iter=real_iter)
final_model = "{dir}/final.mdl".format(dir=args.dir)
train_lib.common.adjust_am_priors(args.dir, combined_or_last_numbered_model,
avg_post_vec_file, final_model,
run_opts)
if args.cleanup:
logger.info("Cleaning up the experiment directory "
"{0}".format(args.dir))
remove_egs = args.remove_egs
if args.egs_dir is not None:
# this egs_dir was not created by this experiment so we will not
# delete it
remove_egs = False
common_train_lib.clean_nnet_dir(
nnet_dir=args.dir, num_iters=num_iters, egs_dir=egs_dir,
preserve_model_interval=args.preserve_model_interval,
remove_egs=remove_egs)
# do some reporting
[report, times, data] = nnet3_log_parse.generate_acc_logprob_report(args.dir)
if args.email is not None:
common_lib.send_mail(report, "Update : Expt {0} : "
"complete".format(args.dir), args.email)
with open("{dir}/accuracy.report".format(dir=args.dir), "w") as f:
f.write(report)
common_lib.execute_command("steps/info/nnet3_dir_info.pl "
"{0}".format(args.dir))
def train(args, run_opts, background_process_handler):
""" The main function for training.
Args:
args: a Namespace object with the required parameters
obtained from the function process_args()
run_opts: RunOpts object obtained from the process_args()
"""
arg_string = pprint.pformat(vars(args))
logger.info("Arguments for the experiment\n{0}".format(arg_string))
# Set some variables.
num_jobs = common_lib.get_number_of_jobs(args.ali_dir)
feat_dim = common_lib.get_feat_dim(args.feat_dir)
ivector_dim = common_lib.get_ivector_dim(args.online_ivector_dir)
# split the training data into parts for individual jobs
# we will use the same number of jobs as that used for alignment
common_lib.split_data(args.feat_dir, num_jobs)
shutil.copy('{0}/tree'.format(args.ali_dir), args.dir)
with open('{0}/num_jobs'.format(args.dir), 'w') as f:
f.write(str(num_jobs))
config_dir = '{0}/configs'.format(args.dir)
var_file = '{0}/vars'.format(config_dir)
variables = common_train_lib.parse_generic_config_vars_file(var_file)
# Set some variables.
try:
model_left_context = variables['model_left_context']
model_right_context = variables['model_right_context']
# this is really the number of times we add layers to the network for
# discriminative pretraining
num_hidden_layers = variables['num_hidden_layers']
except KeyError as e:
raise Exception("KeyError {0}: Variables need to be defined in "
"{1}".format(str(e), '{0}/configs'.format(args.dir)))
left_context = args.chunk_left_context + model_left_context
right_context = args.chunk_right_context + model_right_context
# Initialize as "raw" nnet, prior to training the LDA-like preconditioning
# matrix. This first config just does any initial splicing that we do;
# we do this as it's a convenient way to get the stats for the 'lda-like'
# transform.
if (args.stage <= -5):
logger.info("Initializing a basic network for estimating "
"preconditioning matrix")
common_lib.run_job(
"""{command} {dir}/log/nnet_init.log \
nnet3-init --srand=-2 {dir}/configs/init.config \
{dir}/init.raw""".format(command=run_opts.command,
dir=args.dir))
default_egs_dir = '{0}/egs'.format(args.dir)
if (args.stage <= -4) and args.egs_dir is None:
logger.info("Generating egs")
train_lib.acoustic_model.generate_egs(
data=args.feat_dir, alidir=args.ali_dir, egs_dir=default_egs_dir,
left_context=left_context, right_context=right_context,
valid_left_context=left_context + args.chunk_width,
valid_right_context=right_context + args.chunk_width,
run_opts=run_opts,
frames_per_eg=args.chunk_width,
srand=args.srand,
egs_opts=args.egs_opts,
cmvn_opts=args.cmvn_opts,
online_ivector_dir=args.online_ivector_dir,
samples_per_iter=args.samples_per_iter,
transform_dir=args.transform_dir,
stage=args.egs_stage)
if args.egs_dir is None:
egs_dir = default_egs_dir
else:
egs_dir = args.egs_dir
[egs_left_context, egs_right_context,
frames_per_eg, num_archives] = (
common_train_lib.verify_egs_dir(egs_dir, feat_dim, ivector_dim,
left_context, right_context))
assert(args.chunk_width == frames_per_eg)
if (args.num_jobs_final > num_archives):
raise Exception('num_jobs_final cannot exceed the number of archives '
'in the egs directory')
# copy the properties of the egs to dir for
# use during decoding
common_train_lib.copy_egs_properties_to_exp_dir(egs_dir, args.dir)
if (args.stage <= -3):
logger.info('Computing the preconditioning matrix for input features')
train_lib.common.compute_preconditioning_matrix(
args.dir, egs_dir, num_archives, run_opts,
max_lda_jobs=args.max_lda_jobs,
rand_prune=args.rand_prune)
if (args.stage <= -2):
logger.info("Computing initial vector for FixedScaleComponent before"
" softmax, using priors^{prior_scale} and rescaling to"
" average 1".format(
prior_scale=args.presoftmax_prior_scale_power))
common_train_lib.compute_presoftmax_prior_scale(
args.dir, args.ali_dir, num_jobs, run_opts,
presoftmax_prior_scale_power=args.presoftmax_prior_scale_power)
if (args.stage <= -1):
logger.info("Preparing the initial acoustic model.")
train_lib.acoustic_model.prepare_initial_acoustic_model(
args.dir, args.ali_dir, run_opts)
# set num_iters so that as close as possible, we process the data
# $num_epochs times, i.e. $num_iters*$avg_num_jobs) ==
# $num_epochs*$num_archives, where
# avg_num_jobs=(num_jobs_initial+num_jobs_final)/2.
num_archives_to_process = args.num_epochs * num_archives
num_archives_processed = 0
num_iters = ((num_archives_to_process * 2)
/ (args.num_jobs_initial + args.num_jobs_final))
models_to_combine = common_train_lib.verify_iterations(
num_iters, args.num_epochs,
num_hidden_layers, num_archives,
args.max_models_combine, args.add_layers_period,
args.num_jobs_final)
def learning_rate(iter, current_num_jobs, num_archives_processed):
return common_train_lib.get_learning_rate(iter, current_num_jobs,
num_iters,
num_archives_processed,
num_archives_to_process,
args.initial_effective_lrate,
args.final_effective_lrate)
min_deriv_time = None
max_deriv_time = None
if args.deriv_truncate_margin is not None:
min_deriv_time = -args.deriv_truncate_margin - model_left_context
max_deriv_time = (args.chunk_width - 1 + args.deriv_truncate_margin
+ model_right_context)
logger.info("Training will run for {0} epochs = "
"{1} iterations".format(args.num_epochs, num_iters))
for iter in range(num_iters):
if (args.exit_stage is not None) and (iter == args.exit_stage):
logger.info("Exiting early due to --exit-stage {0}".format(iter))
return
current_num_jobs = int(0.5 + args.num_jobs_initial
+ (args.num_jobs_final - args.num_jobs_initial)
* float(iter) / num_iters)
if args.stage <= iter:
model_file = "{dir}/{iter}.mdl".format(dir=args.dir, iter=iter)
shrinkage_value = 1.0
if args.shrink_value != 1.0:
shrinkage_value = (args.shrink_value
if common_train_lib.do_shrinkage(
iter, model_file,
args.shrink_saturation_threshold)
else 1
)
logger.info("On iteration {0}, learning rate is {1} and "
"shrink value is {2}.".format(
iter, learning_rate(iter, current_num_jobs,
num_archives_processed),
shrinkage_value))
train_lib.common.train_one_iteration(
dir=args.dir,
iter=iter,
srand=args.srand,
egs_dir=egs_dir,
num_jobs=current_num_jobs,
num_archives_processed=num_archives_processed,
num_archives=num_archives,
learning_rate=learning_rate(iter, current_num_jobs,
num_archives_processed),
shrinkage_value=shrinkage_value,
minibatch_size=args.num_chunk_per_minibatch,
num_hidden_layers=num_hidden_layers,
add_layers_period=args.add_layers_period,
left_context=left_context,
right_context=right_context,
min_deriv_time=min_deriv_time,
max_deriv_time=max_deriv_time,
momentum=args.momentum,
max_param_change=args.max_param_change,
shuffle_buffer_size=args.shuffle_buffer_size,
cv_minibatch_size=args.cv_minibatch_size,
run_opts=run_opts,
background_process_handler=background_process_handler)
if args.cleanup:
# do a clean up everythin but the last 2 models, under certain
# conditions
common_train_lib.remove_model(
args.dir, iter-2, num_iters, models_to_combine,
args.preserve_model_interval)
if args.email is not None:
reporting_iter_interval = num_iters * args.reporting_interval
if iter % reporting_iter_interval == 0:
# lets do some reporting
[report, times, data] = (
nnet3_log_parse.generate_accuracy_report(args.dir))
message = report
subject = ("Update : Expt {dir} : "
"Iter {iter}".format(dir=args.dir, iter=iter))
common_lib.send_mail(message, subject, args.email)
num_archives_processed = num_archives_processed + current_num_jobs
if args.stage <= num_iters:
logger.info("Doing final combination to produce final.mdl")
train_lib.common.combine_models(
dir=args.dir, num_iters=num_iters,
models_to_combine=models_to_combine, egs_dir=egs_dir,
run_opts=run_opts,
left_context=left_context, right_context=right_context,
background_process_handler=background_process_handler,
chunk_width=args.chunk_width)
if args.stage <= num_iters + 1:
logger.info("Getting average posterior for purposes of "
"adjusting the priors.")
avg_post_vec_file = train_lib.common.compute_average_posterior(
dir=args.dir, iter='combined', egs_dir=egs_dir,
num_archives=num_archives,
left_context=left_context, right_context=right_context,
prior_subset_size=args.prior_subset_size, run_opts=run_opts)
logger.info("Re-adjusting priors based on computed posteriors")
combined_model = "{dir}/combined.mdl".format(dir=args.dir)
final_model = "{dir}/final.mdl".format(dir=args.dir)
train_lib.common.adjust_am_priors(args.dir, combined_model,
avg_post_vec_file, final_model,
run_opts)
if args.cleanup:
logger.info("Cleaning up the experiment directory "
"{0}".format(args.dir))
remove_egs = args.remove_egs
if args.egs_dir is not None:
# this egs_dir was not created by this experiment so we will not
# delete it
remove_egs = False
common_train_lib.clean_nnet_dir(
nnet_dir=args.dir, num_iters=num_iters, egs_dir=egs_dir,
preserve_model_interval=args.preserve_model_interval,
remove_egs=remove_egs)
# do some reporting
[report, times, data] = nnet3_log_parse.generate_accuracy_report(args.dir)
if args.email is not None:
common_lib.send_mail(report, "Update : Expt {0} : "
"complete".format(args.dir), args.email)
with open("{dir}/accuracy.report".format(dir=args.dir), "w") as f:
f.write(report)
common_lib.run_job("steps/info/nnet3_dir_info.pl "
"{0}".format(args.dir))
def train(args, run_opts):
""" The main function for training.
Args:
args: a Namespace object with the required parameters
obtained from the function process_args()
run_opts: RunOpts object obtained from the process_args()
"""
arg_string = pprint.pformat(vars(args))
logger.info("Arguments for the experiment\n{0}".format(arg_string))
# Copy phones.txt from ali-dir to dir. Later, steps/nnet3/decode.sh will
# use it to check compatibility between training and decoding phone-sets.
shutil.copy('{0}/phones.txt'.format(args.ali_dir), args.dir)
# Set some variables.
num_jobs = common_lib.get_number_of_jobs(args.ali_dir)
feat_dim = common_lib.get_feat_dim(args.feat_dir)
ivector_dim = common_lib.get_ivector_dim(args.online_ivector_dir)
ivector_id = common_lib.get_ivector_extractor_id(args.online_ivector_dir)
# split the training data into parts for individual jobs
# we will use the same number of jobs as that used for alignment
common_lib.execute_command("utils/split_data.sh {0} {1}".format(
args.feat_dir, num_jobs))
shutil.copy('{0}/tree'.format(args.ali_dir), args.dir)
with open('{0}/num_jobs'.format(args.dir), 'w') as f:
f.write(str(num_jobs))
config_dir = '{0}/configs'.format(args.dir)
var_file = '{0}/vars'.format(config_dir)
if args.input_model is None:
config_dir = '{0}/configs'.format(args.dir)
var_file = '{0}/vars'.format(config_dir)
variables = common_train_lib.parse_generic_config_vars_file(var_file)
else:
# If args.input_model is specified, the model left and right contexts
# are computed using input_model.
variables = common_train_lib.get_input_model_info(args.input_model)
# Set some variables.
try:
model_left_context = variables['model_left_context']
model_right_context = variables['model_right_context']
except KeyError as e:
raise Exception("KeyError {0}: Variables need to be defined in "
"{1}".format(str(e), '{0}/configs'.format(args.dir)))
left_context = args.chunk_left_context + model_left_context
right_context = args.chunk_right_context + model_right_context
left_context_initial = (args.chunk_left_context_initial +
model_left_context
if args.chunk_left_context_initial >= 0 else -1)
right_context_final = (args.chunk_right_context_final + model_right_context
if args.chunk_right_context_final >= 0 else -1)
# Initialize as "raw" nnet, prior to training the LDA-like preconditioning
# matrix. This first config just does any initial splicing that we do;
# we do this as it's a convenient way to get the stats for the 'lda-like'
# transform.
if (args.stage <= -5) and (args.input_model is None):
logger.info("Initializing a basic network for estimating "
"preconditioning matrix")
common_lib.execute_command("""{command} {dir}/log/nnet_init.log \
nnet3-init --srand=-2 {dir}/configs/init.config \
{dir}/init.raw""".format(command=run_opts.command,
dir=args.dir))
default_egs_dir = '{0}/egs'.format(args.dir)
if args.stage <= -4 and args.egs_dir is None:
logger.info("Generating egs")
if args.feat_dir is None:
raise Exception(
"--feat-dir option is required if you don't supply --egs-dir")
train_lib.acoustic_model.generate_egs(
data=args.feat_dir,
alidir=args.ali_dir,
egs_dir=default_egs_dir,
left_context=left_context,
right_context=right_context,
left_context_initial=left_context_initial,
right_context_final=right_context_final,
run_opts=run_opts,
frames_per_eg_str=args.chunk_width,
srand=args.srand,
egs_opts=args.egs_opts,
cmvn_opts=args.cmvn_opts,
online_ivector_dir=args.online_ivector_dir,
samples_per_iter=args.samples_per_iter,
stage=args.egs_stage)
if args.egs_dir is None:
egs_dir = default_egs_dir
else:
egs_dir = args.egs_dir
[egs_left_context, egs_right_context, frames_per_eg_str, num_archives
] = (common_train_lib.verify_egs_dir(egs_dir, feat_dim, ivector_dim,
ivector_id, left_context,
right_context, left_context_initial,
right_context_final))
if args.chunk_width != frames_per_eg_str:
raise Exception(
"mismatch between --egs.chunk-width and the frames_per_eg "
"in the egs dir {0} vs {1}".format(args.chunk_width,
frames_per_eg_str))
if args.num_jobs_final > num_archives:
raise Exception('num_jobs_final cannot exceed the number of archives '
'in the egs directory')
# copy the properties of the egs to dir for
# use during decoding
common_train_lib.copy_egs_properties_to_exp_dir(egs_dir, args.dir)
if args.stage <= -3 and (args.input_model is None):
logger.info('Computing the preconditioning matrix for input features')
train_lib.common.compute_preconditioning_matrix(
args.dir,
egs_dir,
num_archives,
run_opts,
max_lda_jobs=args.max_lda_jobs,
rand_prune=args.rand_prune)
if args.stage <= -2 and (args.input_model is None):
logger.info(
"Computing initial vector for FixedScaleComponent before"
" softmax, using priors^{prior_scale} and rescaling to"
" average 1".format(prior_scale=args.presoftmax_prior_scale_power))
common_train_lib.compute_presoftmax_prior_scale(
args.dir,
args.ali_dir,
num_jobs,
run_opts,
presoftmax_prior_scale_power=args.presoftmax_prior_scale_power)
if args.stage <= -1:
logger.info("Preparing the initial acoustic model.")
train_lib.acoustic_model.prepare_initial_acoustic_model(
args.dir, args.ali_dir, run_opts, input_model=args.input_model)
# set num_iters so that as close as possible, we process the data
# $num_epochs times, i.e. $num_iters*$avg_num_jobs) ==
# $num_epochs*$num_archives, where
# avg_num_jobs=(num_jobs_initial+num_jobs_final)/2.
num_archives_to_process = int(args.num_epochs * num_archives)
num_archives_processed = 0
num_iters = ((num_archives_to_process * 2) /
(args.num_jobs_initial + args.num_jobs_final))
# If do_final_combination is True, compute the set of models_to_combine.
# Otherwise, models_to_combine will be none.
if args.do_final_combination:
models_to_combine = common_train_lib.get_model_combine_iters(
num_iters, args.num_epochs, num_archives, args.max_models_combine,
args.num_jobs_final)
else:
models_to_combine = None
min_deriv_time = None
max_deriv_time_relative = None
if args.deriv_truncate_margin is not None:
min_deriv_time = -args.deriv_truncate_margin - model_left_context
max_deriv_time_relative = \
args.deriv_truncate_margin + model_right_context
logger.info("Training will run for {0} epochs = "
"{1} iterations".format(args.num_epochs, num_iters))
for iter in range(num_iters):
if (args.exit_stage is not None) and (iter == args.exit_stage):
logger.info("Exiting early due to --exit-stage {0}".format(iter))
return
current_num_jobs = int(0.5 + args.num_jobs_initial +
(args.num_jobs_final - args.num_jobs_initial) *
float(iter) / num_iters)
if args.stage <= iter:
model_file = "{dir}/{iter}.mdl".format(dir=args.dir, iter=iter)
lrate = common_train_lib.get_learning_rate(
iter, current_num_jobs, num_iters, num_archives_processed,
num_archives_to_process, args.initial_effective_lrate,
args.final_effective_lrate)
shrinkage_value = 1.0 - (args.proportional_shrink * lrate)
if shrinkage_value <= 0.5:
raise Exception(
"proportional-shrink={0} is too large, it gives "
"shrink-value={1}".format(args.proportional_shrink,
shrinkage_value))
if args.shrink_value < shrinkage_value:
shrinkage_value = (
args.shrink_value if common_train_lib.should_do_shrinkage(
iter, model_file,
args.shrink_saturation_threshold) else 1.0)
percent = num_archives_processed * 100.0 / num_archives_to_process
epoch = (num_archives_processed * args.num_epochs /
num_archives_to_process)
shrink_info_str = ''
if shrinkage_value != 1.0:
shrink_info_str = 'shrink: {0:0.5f}'.format(shrinkage_value)
logger.info("Iter: {0}/{1} "
"Epoch: {2:0.2f}/{3:0.1f} ({4:0.1f}% complete) "
"lr: {5:0.6f} {6}".format(iter, num_iters - 1,
epoch, args.num_epochs,
percent, lrate,
shrink_info_str))
train_lib.common.train_one_iteration(
dir=args.dir,
iter=iter,
srand=args.srand,
egs_dir=egs_dir,
num_jobs=current_num_jobs,
num_archives_processed=num_archives_processed,
num_archives=num_archives,
learning_rate=lrate,
dropout_edit_string=common_train_lib.get_dropout_edit_string(
args.dropout_schedule,
float(num_archives_processed) / num_archives_to_process,
iter),
train_opts=' '.join(args.train_opts),
shrinkage_value=shrinkage_value,
minibatch_size_str=args.num_chunk_per_minibatch,
min_deriv_time=min_deriv_time,
max_deriv_time_relative=max_deriv_time_relative,
momentum=args.momentum,
max_param_change=args.max_param_change,
shuffle_buffer_size=args.shuffle_buffer_size,
run_opts=run_opts,
backstitch_training_scale=args.backstitch_training_scale,
backstitch_training_interval=args.backstitch_training_interval,
compute_per_dim_accuracy=args.compute_per_dim_accuracy)
if args.cleanup:
# do a clean up everythin but the last 2 models, under certain
# conditions
common_train_lib.remove_model(args.dir, iter - 2, num_iters,
models_to_combine,
args.preserve_model_interval)
if args.email is not None:
reporting_iter_interval = num_iters * args.reporting_interval
if iter % reporting_iter_interval == 0:
# lets do some reporting
[report, times,
data] = (nnet3_log_parse.generate_acc_logprob_report(
args.dir))
message = report
subject = ("Update : Expt {dir} : "
"Iter {iter}".format(dir=args.dir, iter=iter))
common_lib.send_mail(message, subject, args.email)
num_archives_processed = num_archives_processed + current_num_jobs
if args.stage <= num_iters:
if args.do_final_combination:
logger.info("Doing final combination to produce final.mdl")
train_lib.common.combine_models(
dir=args.dir,
num_iters=num_iters,
models_to_combine=models_to_combine,
egs_dir=egs_dir,
run_opts=run_opts,
minibatch_size_str=args.num_chunk_per_minibatch,
chunk_width=args.chunk_width,
max_objective_evaluations=args.max_objective_evaluations,
compute_per_dim_accuracy=args.compute_per_dim_accuracy)
if args.stage <= num_iters + 1:
logger.info("Getting average posterior for purposes of "
"adjusting the priors.")
# If args.do_final_combination is true, we will use the combined model.
# Otherwise, we will use the last_numbered model.
real_iter = 'combined' if args.do_final_combination else num_iters
avg_post_vec_file = train_lib.common.compute_average_posterior(
dir=args.dir,
iter=real_iter,
egs_dir=egs_dir,
num_archives=num_archives,
prior_subset_size=args.prior_subset_size,
run_opts=run_opts)
logger.info("Re-adjusting priors based on computed posteriors")
combined_or_last_numbered_model = "{dir}/{iter}.mdl".format(
dir=args.dir, iter=real_iter)
final_model = "{dir}/final.mdl".format(dir=args.dir)
train_lib.common.adjust_am_priors(args.dir,
combined_or_last_numbered_model,
avg_post_vec_file, final_model,
run_opts)
if args.cleanup:
logger.info("Cleaning up the experiment directory "
"{0}".format(args.dir))
remove_egs = args.remove_egs
if args.egs_dir is not None:
# this egs_dir was not created by this experiment so we will not
# delete it
remove_egs = False
common_train_lib.clean_nnet_dir(
nnet_dir=args.dir,
num_iters=num_iters,
egs_dir=egs_dir,
preserve_model_interval=args.preserve_model_interval,
remove_egs=remove_egs)
# do some reporting
[report, times,
data] = nnet3_log_parse.generate_acc_logprob_report(args.dir)
if args.email is not None:
common_lib.send_mail(
report, "Update : Expt {0} : "
"complete".format(args.dir), args.email)
with open("{dir}/accuracy.report".format(dir=args.dir), "w") as f:
f.write(report)
common_lib.execute_command("steps/info/nnet3_dir_info.pl "
"{0}".format(args.dir))
def train(args, run_opts, background_process_handler):
""" The main function for training.
Args:
args: a Namespace object with the required parameters
obtained from the function process_args()
run_opts: RunOpts object obtained from the process_args()
"""
arg_string = pprint.pformat(vars(args))
logger.info("Arguments for the experiment\n{0}".format(arg_string))
# Set some variables.
# num_leaves = common_lib.get_number_of_leaves_from_tree(args.ali_dir)
num_jobs = common_lib.get_number_of_jobs(args.ali_dir)
feat_dim = common_lib.get_feat_dim(args.feat_dir)
ivector_dim = common_lib.get_ivector_dim(args.online_ivector_dir)
ivector_id = common_lib.get_ivector_extractor_id(args.online_ivector_dir)
# split the training data into parts for individual jobs
# we will use the same number of jobs as that used for alignment
common_lib.split_data(args.feat_dir, num_jobs)
shutil.copy('{0}/tree'.format(args.ali_dir), args.dir)
with open('{0}/num_jobs'.format(args.dir), 'w') as f:
f.write(str(num_jobs))
config_dir = '{0}/configs'.format(args.dir)
var_file = '{0}/vars'.format(config_dir)
variables = common_train_lib.parse_generic_config_vars_file(var_file)
# Set some variables.
try:
model_left_context = variables['model_left_context']
model_right_context = variables['model_right_context']
# this is really the number of times we add layers to the network for
# discriminative pretraining
num_hidden_layers = variables['num_hidden_layers']
except KeyError as e:
raise Exception("KeyError {0}: Variables need to be defined in "
"{1}".format(str(e), '{0}/configs'.format(args.dir)))
left_context = model_left_context
right_context = model_right_context
# Initialize as "raw" nnet, prior to training the LDA-like preconditioning
# matrix. This first config just does any initial splicing that we do;
# we do this as it's a convenient way to get the stats for the 'lda-like'
# transform.
if (args.stage <= -5) and os.path.exists(args.dir +
"/configs/init.config"):
logger.info("Initializing a basic network for estimating "
"preconditioning matrix")
common_lib.run_job("""{command} {dir}/log/nnet_init.log \
nnet3-init --srand=-2 {dir}/configs/init.config \
{dir}/init.raw""".format(command=run_opts.command,
dir=args.dir))
default_egs_dir = '{0}/egs'.format(args.dir)
if (args.stage <= -4) and args.egs_dir is None:
logger.info("Generating egs")
train_lib.acoustic_model.generate_egs(
data=args.feat_dir,
alidir=args.ali_dir,
egs_dir=default_egs_dir,
left_context=left_context,
right_context=right_context,
run_opts=run_opts,
frames_per_eg_str=str(args.frames_per_eg),
srand=args.srand,
egs_opts=args.egs_opts,
cmvn_opts=args.cmvn_opts,
online_ivector_dir=args.online_ivector_dir,
samples_per_iter=args.samples_per_iter,
transform_dir=args.transform_dir,
stage=args.egs_stage)
if args.egs_dir is None:
egs_dir = default_egs_dir
else:
egs_dir = args.egs_dir
[egs_left_context, egs_right_context, frames_per_eg_str,
num_archives] = (common_train_lib.verify_egs_dir(egs_dir, feat_dim,
ivector_dim, ivector_id,
left_context,
right_context))
assert (str(args.frames_per_eg) == frames_per_eg_str)
if (args.num_jobs_final > num_archives):
raise Exception('num_jobs_final cannot exceed the number of archives '
'in the egs directory')
# copy the properties of the egs to dir for
# use during decoding
common_train_lib.copy_egs_properties_to_exp_dir(egs_dir, args.dir)
if (args.stage <= -3) and os.path.exists(args.dir +
"/configs/init.config"):
logger.info('Computing the preconditioning matrix for input features')
train_lib.common.compute_preconditioning_matrix(
args.dir,
egs_dir,
num_archives,
run_opts,
max_lda_jobs=args.max_lda_jobs,
rand_prune=args.rand_prune)
if (args.stage <= -2):
logger.info(
"Computing initial vector for FixedScaleComponent before"
" softmax, using priors^{prior_scale} and rescaling to"
" average 1".format(prior_scale=args.presoftmax_prior_scale_power))
common_train_lib.compute_presoftmax_prior_scale(
args.dir,
args.ali_dir,
num_jobs,
run_opts,
presoftmax_prior_scale_power=args.presoftmax_prior_scale_power)
if (args.stage <= -1):
logger.info("Preparing the initial acoustic model.")
train_lib.acoustic_model.prepare_initial_acoustic_model(
args.dir, args.ali_dir, run_opts)
# set num_iters so that as close as possible, we process the data
# $num_epochs times, i.e. $num_iters*$avg_num_jobs) ==
# $num_epochs*$num_archives, where
# avg_num_jobs=(num_jobs_initial+num_jobs_final)/2.
num_archives_expanded = num_archives * args.frames_per_eg
num_archives_to_process = int(args.num_epochs * num_archives_expanded)
num_archives_processed = 0
num_iters = ((num_archives_to_process * 2) /
(args.num_jobs_initial + args.num_jobs_final))
models_to_combine = common_train_lib.verify_iterations(
num_iters, args.num_epochs, num_hidden_layers, num_archives_expanded,
args.max_models_combine, args.add_layers_period, args.num_jobs_final)
def learning_rate(iter, current_num_jobs, num_archives_processed):
return common_train_lib.get_learning_rate(iter, current_num_jobs,
num_iters,
num_archives_processed,
num_archives_to_process,
args.initial_effective_lrate,
args.final_effective_lrate)
logger.info("Training will run for {0} epochs = "
"{1} iterations".format(args.num_epochs, num_iters))
for iter in range(num_iters):
if (args.exit_stage is not None) and (iter == args.exit_stage):
logger.info("Exiting early due to --exit-stage {0}".format(iter))
return
current_num_jobs = int(0.5 + args.num_jobs_initial +
(args.num_jobs_final - args.num_jobs_initial) *
float(iter) / num_iters)
if args.stage <= iter:
train_lib.common.train_one_iteration(
dir=args.dir,
iter=iter,
srand=args.srand,
egs_dir=egs_dir,
num_jobs=current_num_jobs,
num_archives_processed=num_archives_processed,
num_archives=num_archives,
learning_rate=learning_rate(iter, current_num_jobs,
num_archives_processed),
dropout_edit_string=common_train_lib.get_dropout_edit_string(
args.dropout_schedule,
float(num_archives_processed) / num_archives_to_process,
iter),
minibatch_size_str=args.minibatch_size,
frames_per_eg=args.frames_per_eg,
num_hidden_layers=num_hidden_layers,
add_layers_period=args.add_layers_period,
left_context=left_context,
right_context=right_context,
momentum=args.momentum,
max_param_change=args.max_param_change,
shuffle_buffer_size=args.shuffle_buffer_size,
run_opts=run_opts,
background_process_handler=background_process_handler)
if args.cleanup:
# do a clean up everythin but the last 2 models, under certain
# conditions
common_train_lib.remove_model(args.dir, iter - 2, num_iters,
models_to_combine,
args.preserve_model_interval)
if args.email is not None:
reporting_iter_interval = num_iters * args.reporting_interval
if iter % reporting_iter_interval == 0:
# lets do some reporting
[report, times,
data] = (nnet3_log_parse.generate_acc_logprob_report(
args.dir))
message = report
subject = ("Update : Expt {dir} : "
"Iter {iter}".format(dir=args.dir, iter=iter))
common_lib.send_mail(message, subject, args.email)
num_archives_processed = num_archives_processed + current_num_jobs
if args.stage <= num_iters:
logger.info("Doing final combination to produce final.mdl")
train_lib.common.combine_models(
dir=args.dir,
num_iters=num_iters,
models_to_combine=models_to_combine,
egs_dir=egs_dir,
left_context=left_context,
right_context=right_context,
minibatch_size_str=args.minibatch_size,
run_opts=run_opts,
background_process_handler=background_process_handler,
sum_to_one_penalty=args.combine_sum_to_one_penalty)
if args.stage <= num_iters + 1:
logger.info("Getting average posterior for purposes of "
"adjusting the priors.")
avg_post_vec_file = train_lib.common.compute_average_posterior(
dir=args.dir,
iter='combined',
egs_dir=egs_dir,
num_archives=num_archives,
left_context=left_context,
right_context=right_context,
prior_subset_size=args.prior_subset_size,
run_opts=run_opts)
logger.info("Re-adjusting priors based on computed posteriors")
combined_model = "{dir}/combined.mdl".format(dir=args.dir)
final_model = "{dir}/final.mdl".format(dir=args.dir)
train_lib.common.adjust_am_priors(args.dir, combined_model,
avg_post_vec_file, final_model,
run_opts)
if args.cleanup:
logger.info("Cleaning up the experiment directory "
"{0}".format(args.dir))
remove_egs = args.remove_egs
if args.egs_dir is not None:
# this egs_dir was not created by this experiment so we will not
# delete it
remove_egs = False
common_train_lib.clean_nnet_dir(
nnet_dir=args.dir,
num_iters=num_iters,
egs_dir=egs_dir,
preserve_model_interval=args.preserve_model_interval,
remove_egs=remove_egs)
# do some reporting
[report, times,
data] = nnet3_log_parse.generate_acc_logprob_report(args.dir)
if args.email is not None:
common_lib.send_mail(
report, "Update : Expt {0} : "
"complete".format(args.dir), args.email)
with open("{dir}/accuracy.report".format(dir=args.dir), "w") as f:
f.write(report)
common_lib.run_job("steps/info/nnet3_dir_info.pl " "{0}".format(args.dir))
train_lib.common.compute_preconditioning_matrix(
args.dir, egs_dir, num_archives, run_opts,
max_lda_jobs=args.max_lda_jobs,
rand_prune=args.rand_prune)
# ====================> 计算 获得 统计性的 pdf vec 可能 与pdf的先验概率有关吧.
# args.presoftmax_prior_scale_power --- -0.25
if args.stage <= -2:
logger.info("Computing initial vector for FixedScaleComponent before"
" softmax, using priors^{prior_scale} and rescaling to"
" average 1".format(
prior_scale=args.presoftmax_prior_scale_power))
common_train_lib.compute_presoftmax_prior_scale(
args.dir, args.ali_dir, num_jobs, run_opts,
presoftmax_prior_scale_power=args.presoftmax_prior_scale_power)
# ====================> 准备 初始化的声学模型
# 1 nnet3-init 向exp/nnet3/tdnn_sp/init.raw 中加入 final.config 的信息 增加layers. ==> exp/nnet3/tdnn_sp/0.raw
# 2 nnet3-am-init exp/tri5a_ali/final.mdl 0.raw - |
# nnet3-am-train-transilation nnet3.raw final.mdl exp/tri5a_ali/alis 0.mdl
if args.stage <= -1:
logger.info("Preparing the initial acoustic model.")
train_lib.acoustic_model.prepare_initial_acoustic_model(
args.dir, args.ali_dir, run_opts)
