def next_job(self, job):
'''Sends a finished job back to the coordinator and retrieves in exchange the next one.
Kwargs:
job (WorkerJob): job that was finished by a worker and who's results are to be
digested by the coordinator
Returns:
WorkerJob. next job of one of the running epochs that will get
associated with the worker from the finished job and put into state 'running'
'''
if self.is_chief:
# Try to find the epoch the job belongs to
epoch = next((epoch for epoch in self._epochs_running if epoch.id == job.epoch_id), None)
if epoch:
# We are going to manipulate things - let's avoid undefined state
with self._lock:
# Let the epoch finish the job
epoch.finish_job(job)
# Check, if epoch is done now
if epoch.done():
# If it declares itself done, move it from 'running' to 'done' collection
self._epochs_running.remove(epoch)
self._epochs_done.append(epoch)
log_info('%s' % epoch)
else:
# There was no running epoch found for this job - this should never happen.
log_error('There is no running epoch of ID %d for job with ID %d. This should never happen.' % (job.epoch_id, job.id))
return self.get_job(job.worker)
# We are a remote worker and have to hand over to the chief worker by HTTP
result = self._talk_to_chief('', data=pickle.dumps(job))
if result:
result = pickle.loads(result)
return result
def main(_):
initialize_globals()
if not FLAGS.test_files:
log_error('You need to specify what files to use for evaluation via '
'the --test_files flag.')
exit(1)
# sort examples by length, improves packing of batches and timesteps
test_data = preprocess(FLAGS.test_files.split(','),
FLAGS.test_batch_size,
alphabet=Config.alphabet,
numcep=Config.n_input,
numcontext=Config.n_context,
hdf5_cache_path=FLAGS.hdf5_test_set).sort_values(
by="features_len", ascending=False)
from DeepSpeech import create_inference_graph
graph = create_inference_graph(batch_size=FLAGS.test_batch_size,
n_steps=-1)
samples = evaluate(test_data, graph)
if FLAGS.test_output_file:
# Save decoded tuples as JSON, converting NumPy floats to Python floats
json.dump(samples,
open(FLAGS.test_output_file, 'w'),
default=lambda x: float(x))
def get_job(self, worker=0):
'''Retrieves the first job for a worker.
Kwargs:
worker (int): index of the worker to get the first job for
Returns:
WorkerJob. a job of one of the running epochs that will get
associated with the given worker and put into state 'running'
'''
# Let's ensure that this does not interfere with other workers/requests
with self._lock:
if self.is_chief:
# First try to get a next job
job = self._get_job(worker)
if job is None:
# If there was no next job, we give it a second chance by triggering the epoch state machine
if self._next_epoch():
# Epoch state machine got a new epoch
# Second try to get a next job
job = self._get_job(worker)
if job is None:
# Albeit the epoch state machine got a new epoch, the epoch had no new job for us
log_error('Unexpected case - no job for worker %d.' % (worker))
return job
# Epoch state machine has no new epoch
# This happens at the end of the whole training - nothing to worry about
log_traffic('No jobs left for worker %d.' % (worker))
self._log_all_jobs()
return None
# We got a new job from one of the currently running epochs
log_traffic('Got new %s' % job)
return job
# We are a remote worker and have to hand over to the chief worker by HTTP
result = self._talk_to_chief(PREFIX_GET_JOB + str(FLAGS.task_index))
if result:
result = pickle.loads(result)
return result
def do_single_file_inference(input_file_path):
tf.reset_default_graph()
with tf.Session(config=Config.session_config) as session:
inputs, outputs, layers = create_inference_graph(batch_size=1, n_steps=-1)
# REVIEW josephz: Hack: print all layers here.
for i, l in enumerate(layers):
print("layer '{}': '{}'".format(i, l))
# Create a saver using variables from the above newly created graph
mapping = {v.op.name: v for v in tf.global_variables() if not v.op.name.startswith('previous_state_')}
saver = tf.train.Saver(mapping)
# Restore variables from training checkpoint
# TODO: This restores the most recent checkpoint, but if we use validation to counteract
# over-fitting, we may want to restore an earlier checkpoint.
checkpoint = tf.train.get_checkpoint_state(FLAGS.checkpoint_dir)
if not checkpoint:
log_error('Checkpoint directory ({}) does not contain a valid checkpoint state.'.format(FLAGS.checkpoint_dir))
exit(1)
checkpoint_path = checkpoint.model_checkpoint_path
saver.restore(session, checkpoint_path)
session.run(outputs['initialize_state'])
features = audiofile_to_input_vector(input_file_path, Config.n_input, Config.n_context)
num_strides = len(features) - (Config.n_context * 2)
# Create a view into the array with overlapping strides of size
# numcontext (past) + 1 (present) + numcontext (future)
window_size = 2*Config.n_context+1
features = np.lib.stride_tricks.as_strided(
features,
(num_strides, window_size, Config.n_input),
(features.strides[0], features.strides[0], features.strides[1]),
writeable=False)
# logits = session.run(outputs['outputs'], feed_dict = {
# inputs['input']: [features],
# inputs['input_lengths']: [num_strides],
# })
name_mapping = {
'layer_1': 'Minimum:0',
'layer_2': 'Minimum_1:0',
'layer_3': 'Minimum_2:0',
'layer_5': 'Minimum_3:0',
'layer_6': 'Add_4:0'
}
output_tensors = [tensor for l, tensor in name_mapping.items()]
outputs = session.run(output_tensors, feed_dict={
inputs['input']: [features],
inputs['input_lengths']: [num_strides],
})
# output_path = '/home/josephz/GoogleDrive/University/UW/2018-19/CSE481I/singing-style' \
# '-transfer/src/extern/DeepSpeech/scripts/cover'
# output_path = FLAGS.np_output_path
# if not os.path.isdir(output_path):
# os.mkdir(output_path)
# assert os.path.isdir(output_path)
intermediate_layers = {}
for tensor_name, output in zip(name_mapping.keys(), outputs):
# print("\toutputting thing of shape '{}' to '{}'".format(output.shape,
# os.path.basename(output_path)))
# np.save(os.path.join(output_path, tensor_name), output)
intermediate_layers[tensor_name] = output
return intermediate_layers
def export():
r'''
Restores the trained variables into a simpler graph that will be exported for serving.
'''
log_info('Exporting the model...')
with tf.device('/cpu:0'):
from tensorflow.python.framework.ops import Tensor, Operation
tf.reset_default_graph()
session = tf.Session(config=Config.session_config)
inputs, outputs, _ = create_inference_graph(batch_size=1, n_steps=FLAGS.n_steps, tflite=FLAGS.export_tflite)
input_names = ",".join(tensor.op.name for tensor in inputs.values())
output_names_tensors = [ tensor.op.name for tensor in outputs.values() if isinstance(tensor, Tensor) ]
output_names_ops = [ tensor.name for tensor in outputs.values() if isinstance(tensor, Operation) ]
output_names = ",".join(output_names_tensors + output_names_ops)
input_shapes = ":".join(",".join(map(str, tensor.shape)) for tensor in inputs.values())
if not FLAGS.export_tflite:
mapping = {v.op.name: v for v in tf.global_variables() if not v.op.name.startswith('previous_state_')}
else:
# Create a saver using variables from the above newly created graph
def fixup(name):
if name.startswith('rnn/lstm_cell/'):
return name.replace('rnn/lstm_cell/', 'lstm_fused_cell/')
return name
mapping = {fixup(v.op.name): v for v in tf.global_variables()}
saver = tf.train.Saver(mapping)
# Restore variables from training checkpoint
checkpoint = tf.train.get_checkpoint_state(FLAGS.checkpoint_dir)
checkpoint_path = checkpoint.model_checkpoint_path
output_filename = 'output_graph.pb'
if FLAGS.remove_export:
if os.path.isdir(FLAGS.export_dir):
log_info('Removing old export')
shutil.rmtree(FLAGS.export_dir)
try:
output_graph_path = os.path.join(FLAGS.export_dir, output_filename)
if not os.path.isdir(FLAGS.export_dir):
os.makedirs(FLAGS.export_dir)
def do_graph_freeze(output_file=None, output_node_names=None, variables_blacklist=None):
freeze_graph.freeze_graph_with_def_protos(
input_graph_def=session.graph_def,
input_saver_def=saver.as_saver_def(),
input_checkpoint=checkpoint_path,
output_node_names=output_node_names,
restore_op_name=None,
filename_tensor_name=None,
output_graph=output_file,
clear_devices=False,
variable_names_blacklist=variables_blacklist,
initializer_nodes='')
if not FLAGS.export_tflite:
do_graph_freeze(output_file=output_graph_path, output_node_names=output_names, variables_blacklist='previous_state_c,previous_state_h')
else:
temp_fd, temp_freeze = tempfile.mkstemp(dir=FLAGS.export_dir)
os.close(temp_fd)
do_graph_freeze(output_file=temp_freeze, output_node_names=output_names, variables_blacklist='')
output_tflite_path = os.path.join(FLAGS.export_dir, output_filename.replace('.pb', '.tflite'))
class TFLiteFlags():
def __init__(self):
self.graph_def_file = temp_freeze
self.inference_type = 'FLOAT'
self.input_arrays = input_names
self.input_shapes = input_shapes
self.output_arrays = output_names
self.output_file = output_tflite_path
self.output_format = 'TFLITE'
default_empty = [
'inference_input_type',
'mean_values',
'default_ranges_min', 'default_ranges_max',
'drop_control_dependency',
'reorder_across_fake_quant',
'change_concat_input_ranges',
'allow_custom_ops',
'converter_mode',
'post_training_quantize',
'dump_graphviz_dir',
'dump_graphviz_video'
]
for e in default_empty:
self.__dict__[e] = None
flags = TFLiteFlags()
tflite_convert._convert_model(flags)
os.unlink(temp_freeze)
log_info('Exported model for TF Lite engine as {}'.format(os.path.basename(output_tflite_path)))
log_info('Models exported at %s' % (FLAGS.export_dir))
except RuntimeError as e:
log_error(str(e))
def train(server=None):
r'''
Trains the network on a given server of a cluster.
If no server provided, it performs single process training.
'''
# Initializing and starting the training coordinator
coord = TrainingCoordinator(Config.is_chief)
coord.start()
# Create a variable to hold the global_step.
# It will automagically get incremented by the optimizer.
global_step = tf.Variable(0, trainable=False, name='global_step')
dropout_rates = [tf.placeholder(tf.float32, name='dropout_{}'.format(i)) for i in range(6)]
# Reading training set
train_data = preprocess(FLAGS.train_files.split(','),
FLAGS.train_batch_size,
Config.n_input,
Config.n_context,
Config.alphabet,
hdf5_cache_path=FLAGS.train_cached_features_path)
train_set = DataSet(train_data,
FLAGS.train_batch_size,
limit=FLAGS.limit_train,
next_index=lambda i: coord.get_next_index('train'))
# Reading validation set
dev_data = preprocess(FLAGS.dev_files.split(','),
FLAGS.dev_batch_size,
Config.n_input,
Config.n_context,
Config.alphabet,
hdf5_cache_path=FLAGS.dev_cached_features_path)
dev_set = DataSet(dev_data,
FLAGS.dev_batch_size,
limit=FLAGS.limit_dev,
next_index=lambda i: coord.get_next_index('dev'))
# Combining all sets to a multi set model feeder
model_feeder = ModelFeeder(train_set,
dev_set,
Config.n_input,
Config.n_context,
Config.alphabet,
tower_feeder_count=len(Config.available_devices))
# Create the optimizer
optimizer = create_optimizer()
# Synchronous distributed training is facilitated by a special proxy-optimizer
if not server is None:
optimizer = tf.train.SyncReplicasOptimizer(optimizer,
replicas_to_aggregate=FLAGS.replicas_to_agg,
total_num_replicas=FLAGS.replicas)
# Get the data_set specific graph end-points
gradients, loss = get_tower_results(model_feeder, optimizer, dropout_rates)
# Average tower gradients across GPUs
avg_tower_gradients = average_gradients(gradients)
# Add summaries of all variables and gradients to log
log_grads_and_vars(avg_tower_gradients)
# Op to merge all summaries for the summary hook
merge_all_summaries_op = tf.summary.merge_all()
# These are saved on every step
step_summaries_op = tf.summary.merge_all('step_summaries')
step_summary_writers = {
'train': tf.summary.FileWriter(os.path.join(FLAGS.summary_dir, 'train'), max_queue=120),
'dev': tf.summary.FileWriter(os.path.join(FLAGS.summary_dir, 'dev'), max_queue=120)
}
# Apply gradients to modify the model
apply_gradient_op = optimizer.apply_gradients(avg_tower_gradients, global_step=global_step)
if FLAGS.early_stop is True and not FLAGS.validation_step > 0:
log_warn('Parameter --validation_step needs to be >0 for early stopping to work')
class CoordHook(tf.train.SessionRunHook):
r'''
Embedded coordination hook-class that will use variables of the
surrounding Python context.
'''
def after_create_session(self, session, coord):
log_debug('Starting queue runners...')
model_feeder.start_queue_threads(session, coord)
log_debug('Queue runners started.')
def end(self, session):
# Closing the data_set queues
log_debug('Closing queues...')
model_feeder.close_queues(session)
log_debug('Queues closed.')
# Telling the ps that we are done
send_token_to_ps(session)
# Collecting the hooks
hooks = [CoordHook()]
# Hook to handle initialization and queues for sync replicas.
if not server is None:
hooks.append(optimizer.make_session_run_hook(Config.is_chief))
# Hook to save TensorBoard summaries
if FLAGS.summary_secs > 0:
hooks.append(tf.train.SummarySaverHook(save_secs=FLAGS.summary_secs, output_dir=FLAGS.summary_dir, summary_op=merge_all_summaries_op))
# Hook wih number of checkpoint files to save in checkpoint_dir
if FLAGS.train and FLAGS.max_to_keep > 0:
saver = tf.train.Saver(max_to_keep=FLAGS.max_to_keep)
hooks.append(tf.train.CheckpointSaverHook(checkpoint_dir=FLAGS.checkpoint_dir, save_secs=FLAGS.checkpoint_secs, saver=saver))
no_dropout_feed_dict = {
dropout_rates[0]: 0.,
dropout_rates[1]: 0.,
dropout_rates[2]: 0.,
dropout_rates[3]: 0.,
dropout_rates[4]: 0.,
dropout_rates[5]: 0.,
}
# Progress Bar
def update_progressbar(set_name):
if not hasattr(update_progressbar, 'current_set_name'):
update_progressbar.current_set_name = None
if (update_progressbar.current_set_name != set_name or
update_progressbar.current_job_index == update_progressbar.total_jobs):
# finish prev pbar if it exists
if hasattr(update_progressbar, 'pbar') and update_progressbar.pbar:
update_progressbar.pbar.finish()
update_progressbar.total_jobs = None
update_progressbar.current_job_index = 0
current_epoch = coord._epoch-1
if set_name == "train":
log_info('Training epoch %i...' % current_epoch)
update_progressbar.total_jobs = coord._num_jobs_train
else:
log_info('Validating epoch %i...' % current_epoch)
update_progressbar.total_jobs = coord._num_jobs_dev
# recreate pbar
update_progressbar.pbar = progressbar.ProgressBar(max_value=update_progressbar.total_jobs,
redirect_stdout=True).start()
update_progressbar.current_set_name = set_name
if update_progressbar.pbar:
update_progressbar.pbar.update(update_progressbar.current_job_index+1, force=True)
update_progressbar.current_job_index += 1
# Initialize update_progressbar()'s child fields to safe values
update_progressbar.pbar = None
# The MonitoredTrainingSession takes care of session initialization,
# restoring from a checkpoint, saving to a checkpoint, and closing when done
# or an error occurs.
try:
with tf.train.MonitoredTrainingSession(master='' if server is None else server.target,
is_chief=Config.is_chief,
hooks=hooks,
checkpoint_dir=FLAGS.checkpoint_dir,
save_checkpoint_secs=None, # already taken care of by a hook
log_step_count_steps=0, # disable logging of steps/s to avoid TF warning in validation sets
config=Config.session_config) as session:
tf.get_default_graph().finalize()
try:
if Config.is_chief:
# Retrieving global_step from the (potentially restored) model
model_feeder.set_data_set(no_dropout_feed_dict, model_feeder.train)
step = session.run(global_step, feed_dict=no_dropout_feed_dict)
coord.start_coordination(model_feeder, step)
# Get the first job
job = coord.get_job()
while job and not session.should_stop():
log_debug('Computing %s...' % job)
is_train = job.set_name == 'train'
# The feed_dict (mainly for switching between queues)
if is_train:
feed_dict = {
dropout_rates[0]: FLAGS.dropout_rate,
dropout_rates[1]: FLAGS.dropout_rate2,
dropout_rates[2]: FLAGS.dropout_rate3,
dropout_rates[3]: FLAGS.dropout_rate4,
dropout_rates[4]: FLAGS.dropout_rate5,
dropout_rates[5]: FLAGS.dropout_rate6,
}
else:
feed_dict = no_dropout_feed_dict
# Sets the current data_set for the respective placeholder in feed_dict
model_feeder.set_data_set(feed_dict, getattr(model_feeder, job.set_name))
# Initialize loss aggregator
total_loss = 0.0
# Setting the training operation in case of training requested
train_op = apply_gradient_op if is_train else []
# So far the only extra parameter is the feed_dict
extra_params = { 'feed_dict': feed_dict }
step_summary_writer = step_summary_writers.get(job.set_name)
# Loop over the batches
for job_step in range(job.steps):
if session.should_stop():
break
log_debug('Starting batch...')
# Compute the batch
_, current_step, batch_loss, step_summary = session.run([train_op, global_step, loss, step_summaries_op], **extra_params)
# Log step summaries
step_summary_writer.add_summary(step_summary, current_step)
# Uncomment the next line for debugging race conditions / distributed TF
log_debug('Finished batch step %d.' % current_step)
# Add batch to loss
total_loss += batch_loss
# Gathering job results
job.loss = total_loss / job.steps
# Display progressbar
if FLAGS.show_progressbar:
update_progressbar(job.set_name)
# Send the current job to coordinator and receive the next one
log_debug('Sending %s...' % job)
job = coord.next_job(job)
if update_progressbar.pbar:
update_progressbar.pbar.finish()
except Exception as e:
log_error(str(e))
traceback.print_exc()
# Calling all hook's end() methods to end blocking calls
for hook in hooks:
hook.end(session)
# Only chief has a SyncReplicasOptimizer queue runner that needs to be stopped for unblocking process exit.
# A rather graceful way to do this is by stopping the ps.
# Only one party can send it w/o failing.
if Config.is_chief:
send_token_to_ps(session, kill=True)
sys.exit(1)
log_debug('Session closed.')
except tf.errors.InvalidArgumentError as e:
log_error(str(e))
log_error('The checkpoint in {0} does not match the shapes of the model.'
' Did you change alphabet.txt or the --n_hidden parameter'
' between train runs using the same checkpoint dir? Try moving'
' or removing the contents of {0}.'.format(FLAGS.checkpoint_dir))
sys.exit(1)
# Stopping the coordinator
coord.stop()
def evaluate(test_data, inference_graph):
scorer = Scorer(FLAGS.lm_alpha, FLAGS.lm_beta, FLAGS.lm_binary_path,
FLAGS.lm_trie_path, Config.alphabet)
def create_windows(features):
num_strides = len(features) - (Config.n_context * 2)
# Create a view into the array with overlapping strides of size
# numcontext (past) + 1 (present) + numcontext (future)
window_size = 2 * Config.n_context + 1
features = np.lib.stride_tricks.as_strided(
features, (num_strides, window_size, Config.n_input),
(features.strides[0], features.strides[0], features.strides[1]),
writeable=False)
return features
# Create overlapping windows over the features
test_data['features'] = test_data['features'].apply(create_windows)
with tf.Session(config=Config.session_config) as session:
inputs, outputs, layers = inference_graph
# Transpose to batch major for decoder
transposed = tf.transpose(outputs['outputs'], [1, 0, 2])
labels_ph = tf.placeholder(tf.int32, [FLAGS.test_batch_size, None],
name="labels")
label_lengths_ph = tf.placeholder(tf.int32, [FLAGS.test_batch_size],
name="label_lengths")
sparse_labels = tf.cast(
ctc_label_dense_to_sparse(labels_ph, label_lengths_ph,
FLAGS.test_batch_size), tf.int32)
loss = tf.nn.ctc_loss(labels=sparse_labels,
inputs=layers['raw_logits'],
sequence_length=inputs['input_lengths'])
# Create a saver using variables from the above newly created graph
mapping = {
v.op.name: v
for v in tf.global_variables()
if not v.op.name.startswith('previous_state_')
}
saver = tf.train.Saver(mapping)
# Restore variables from training checkpoint
checkpoint = tf.train.get_checkpoint_state(FLAGS.checkpoint_dir)
if not checkpoint:
log_error(
'Checkpoint directory ({}) does not contain a valid checkpoint state.'
.format(FLAGS.checkpoint_dir))
exit(1)
checkpoint_path = checkpoint.model_checkpoint_path
saver.restore(session, checkpoint_path)
logitses = []
losses = []
print('Computing acoustic model predictions...')
batch_count = len(test_data) // FLAGS.test_batch_size
bar = progressbar.ProgressBar(max_value=batch_count,
widget=progressbar.AdaptiveETA)
# First pass, compute losses and transposed logits for decoding
for batch in bar(split_data(test_data, FLAGS.test_batch_size)):
session.run(outputs['initialize_state'])
features = pad_to_dense(batch['features'].values)
features_len = batch['features_len'].values
labels = pad_to_dense(batch['transcript'].values)
label_lengths = batch['transcript_len'].values
logits, loss_ = session.run(
[transposed, loss],
feed_dict={
inputs['input']: features,
inputs['input_lengths']: features_len,
labels_ph: labels,
label_lengths_ph: label_lengths
})
logitses.append(logits)
losses.extend(loss_)
ground_truths = []
predictions = []
print('Decoding predictions...')
bar = progressbar.ProgressBar(max_value=batch_count,
widget=progressbar.AdaptiveETA)
# Get number of accessible CPU cores for this process
try:
num_processes = cpu_count()
except:
num_processes = 1
# Second pass, decode logits and compute WER and edit distance metrics
for logits, batch in bar(
zip(logitses, split_data(test_data, FLAGS.test_batch_size))):
seq_lengths = batch['features_len'].values.astype(np.int32)
decoded = ctc_beam_search_decoder_batch(logits,
seq_lengths,
Config.alphabet,
FLAGS.beam_width,
num_processes=num_processes,
scorer=scorer)
ground_truths.extend(
Config.alphabet.decode(l) for l in batch['transcript'])
predictions.extend(d[0][1] for d in decoded)
distances = [levenshtein(a, b) for a, b in zip(ground_truths, predictions)]
wer, samples = calculate_report(ground_truths, predictions, distances,
losses)
mean_edit_distance = np.mean(distances)
mean_loss = np.mean(losses)
# Take only the first report_count items
report_samples = itertools.islice(samples, FLAGS.report_count)
print('Test - WER: %f, CER: %f, loss: %f' %
(wer, mean_edit_distance, mean_loss))
print('-' * 80)
for sample in report_samples:
print('WER: %f, CER: %f, loss: %f' %
(sample.wer, sample.distance, sample.loss))
print(' - src: "%s"' % sample.src)
print(' - res: "%s"' % sample.res)
print('-' * 80)
return samples
def initialize_globals():
c = AttrDict()
# ps and worker hosts required for p2p cluster setup
FLAGS.ps_hosts = list(filter(len, FLAGS.ps_hosts.split(',')))
FLAGS.worker_hosts = list(filter(len, FLAGS.worker_hosts.split(',')))
# Create a cluster from the parameter server and worker hosts.
c.cluster = tf.train.ClusterSpec({'ps': FLAGS.ps_hosts, 'worker': FLAGS.worker_hosts})
# The absolute number of computing nodes - regardless of cluster or single mode
num_workers = max(1, len(FLAGS.worker_hosts))
# If replica numbers are negative, we multiply their absolute values with the number of workers
if FLAGS.replicas < 0:
FLAGS.replicas = num_workers * -FLAGS.replicas
if FLAGS.replicas_to_agg < 0:
FLAGS.replicas_to_agg = num_workers * -FLAGS.replicas_to_agg
# The device path base for this node
c.worker_device = '/job:%s/task:%d' % (FLAGS.job_name, FLAGS.task_index)
# This node's CPU device
c.cpu_device = c.worker_device + '/cpu:0'
# This node's available GPU devices
c.available_devices = [c.worker_device + gpu for gpu in get_available_gpus()]
# If there is no GPU available, we fall back to CPU based operation
if 0 == len(c.available_devices):
c.available_devices = [c.cpu_device]
# Set default dropout rates
if FLAGS.dropout_rate2 < 0:
FLAGS.dropout_rate2 = FLAGS.dropout_rate
if FLAGS.dropout_rate3 < 0:
FLAGS.dropout_rate3 = FLAGS.dropout_rate
if FLAGS.dropout_rate6 < 0:
FLAGS.dropout_rate6 = FLAGS.dropout_rate
# Set default checkpoint dir
if len(FLAGS.checkpoint_dir) == 0:
FLAGS.checkpoint_dir = xdg.save_data_path(os.path.join('deepspeech','checkpoints'))
# Set default summary dir
if len(FLAGS.summary_dir) == 0:
FLAGS.summary_dir = xdg.save_data_path(os.path.join('deepspeech','summaries'))
# Standard session configuration that'll be used for all new sessions.
c.session_config = tf.ConfigProto(allow_soft_placement=True, log_device_placement=FLAGS.log_placement,
inter_op_parallelism_threads=FLAGS.inter_op_parallelism_threads,
intra_op_parallelism_threads=FLAGS.intra_op_parallelism_threads)
c.alphabet = Alphabet(os.path.abspath(FLAGS.alphabet_config_path))
# Geometric Constants
# ===================
# For an explanation of the meaning of the geometric constants, please refer to
# doc/Geometry.md
# Number of MFCC features
c.n_input = 26 # TODO: Determine this programmatically from the sample rate
# The number of frames in the context
c.n_context = 9 # TODO: Determine the optimal value using a validation data set
# Number of units in hidden layers
c.n_hidden = FLAGS.n_hidden
c.n_hidden_1 = c.n_hidden
c.n_hidden_2 = c.n_hidden
c.n_hidden_5 = c.n_hidden
# LSTM cell state dimension
c.n_cell_dim = c.n_hidden
# The number of units in the third layer, which feeds in to the LSTM
c.n_hidden_3 = c.n_cell_dim
# Units in the sixth layer = number of characters in the target language plus one
c.n_hidden_6 = c.alphabet.size() + 1 # +1 for CTC blank label
# Queues that are used to gracefully stop parameter servers.
# Each queue stands for one ps. A finishing worker sends a token to each queue before joining/quitting.
# Each ps will dequeue as many tokens as there are workers before joining/quitting.
# This ensures parameter servers won't quit, if still required by at least one worker and
# also won't wait forever (like with a standard `server.join()`).
done_queues = []
for i, ps in enumerate(FLAGS.ps_hosts):
# Queues are hosted by their respective owners
with tf.device('/job:ps/task:%d' % i):
done_queues.append(tf.FIFOQueue(1, tf.int32, shared_name=('queue%i' % i)))
# Placeholder to pass in the worker's index as token
c.token_placeholder = tf.placeholder(tf.int32)
# Enqueue operations for each parameter server
c.done_enqueues = [queue.enqueue(c.token_placeholder) for queue in done_queues]
# Dequeue operations for each parameter server
c.done_dequeues = [queue.dequeue() for queue in done_queues]
if len(FLAGS.one_shot_infer) > 0:
FLAGS.train = False
FLAGS.test = False
FLAGS.export_dir = ''
if not os.path.exists(FLAGS.one_shot_infer):
log_error('Path specified in --one_shot_infer is not a valid file.')
exit(1)
# Determine, if we are the chief worker
c.is_chief = len(FLAGS.worker_hosts) == 0 or (FLAGS.task_index == 0 and FLAGS.job_name == 'worker')
ConfigSingleton._config = c