def tower_loss(scope):
"""Calculate the total loss on a single tower running the CIFAR model.
Args:
scope: unique prefix string identifying the CIFAR tower, e.g. 'tower_0'
Returns:
Tensor of shape [] containing the total loss for a batch of data
"""
# Get images and labels for CIFAR-10.
images, labels = svhn.distorted_inputs()
# Build inference Graph.
logits = svhn.inference(images)
# Build the portion of the Graph calculating the losses. Note that we will
# assemble the total_loss using a custom function below.
_ = svhn.loss(logits, labels)
# Assemble all of the losses for the current tower only.
losses = tf.get_collection('losses', scope)
# Calculate the total loss for the current tower.
total_loss = tf.add_n(losses, name='total_loss')
# Attach a scalar summary to all individual losses and the total loss; do the
# same for the averaged version of the losses.
for l in losses + [total_loss]:
# Remove 'tower_[0-9]/' from the name in case this is a multi-GPU training
# session. This helps the clarity of presentation on tensorboard.
loss_name = re.sub('%s_[0-9]*/' % svhn.TOWER_NAME, '', l.op.name)
tf.summary.scalar(loss_name, l)
return total_loss
def train():
with tf.Graph().as_default():
global_step = tf.Variable(0, trainable=False)
# Get images and labels for CIFAR-10.
images, labels = svhn.distorted_inputs()
# Build a Graph that computes the logits predictions from the
# inference model.
logits = svhn.inference(images)
# Calculate loss.
loss = svhn.loss(logits, labels)
# Build a Graph that trains the model with one batch of examples and
# updates the model parameters.
train_op = svhn.train(loss, global_step)
# Create a saver.
saver = tf.train.Saver(tf.all_variables())
# Build the summary operation based on the TF collection of Summaries.
summary_op = tf.merge_all_summaries()
# Build an initialization operation to run below.
init = tf.initialize_all_variables()
# Start running operations on the Graph.
sess = tf.Session(config=tf.ConfigProto(log_device_placement=FLAGS.log_device_placement))
sess.run(init)
# Start the queue runners.
tf.train.start_queue_runners(sess=sess)
summary_writer = tf.train.SummaryWriter(FLAGS.train_dir, graph_def=sess.graph_def)
for step in xrange(FLAGS.max_steps):
start_time = time.time()
_, loss_value = sess.run([train_op, loss])
duration = time.time() - start_time
assert not np.isnan(loss_value), "Model diverged with loss = NaN"
if step % 10 == 0:
num_examples_per_step = FLAGS.batch_size
examples_per_sec = num_examples_per_step / duration
sec_per_batch = float(duration)
format_str = "%s: step %d, loss = %.2f (%.1f examples/sec; %.3f " "sec/batch)"
print(format_str % (datetime.now(), step, loss_value, examples_per_sec, sec_per_batch))
if step % 100 == 0:
summary_str = sess.run(summary_op)
summary_writer.add_summary(summary_str, step)
# Save the model checkpoint periodically.
if step % 1000 == 0 or (step + 1) == FLAGS.max_steps:
checkpoint_path = os.path.join(FLAGS.train_dir, "model.ckpt")
saver.save(sess, checkpoint_path, global_step=step)
def train():
"""Train CIFAR-10 for a number of steps."""
with tf.Graph().as_default():
global_step = tf.contrib.framework.get_or_create_global_step()
# Force input pipeline to CPU:0 to avoid operations sometimes ending up on
# GPU and resulting in a slow down.
with tf.device('/cpu:0'):
images, labels = svhn.distorted_inputs()
# Build a Graph that computes the logits predictions from the
# inference model.
logits = svhn.inference(images)
# Calculate loss.
loss = svhn.loss(logits, labels)
# Build a Graph that trains the model with one batch of examples and
# updates the model parameters.
train_op = svhn.train(loss, global_step)
class _LoggerHook(tf.train.SessionRunHook):
"""Logs loss and runtime."""
def begin(self):
self._step = -1
self._start_time = time.time()
def before_run(self, run_context):
self._step += 1
return tf.train.SessionRunArgs(loss) # Asks for loss value.
def after_run(self, run_context, run_values):
if self._step % FLAGS.log_frequency == 0:
current_time = time.time()
duration = current_time - self._start_time
self._start_time = current_time
loss_value = run_values.results
examples_per_sec = FLAGS.log_frequency * FLAGS.batch_size / duration
sec_per_batch = float(duration / FLAGS.log_frequency)
format_str = (
'%s: step %d, loss = %.2f (%.1f examples/sec; %.3f '
'sec/batch)')
print(format_str % (datetime.now(), self._step, loss_value,
examples_per_sec, sec_per_batch))
with tf.train.MonitoredTrainingSession(
checkpoint_dir=FLAGS.train_dir,
hooks=[
tf.train.StopAtStepHook(last_step=FLAGS.max_steps),
tf.train.NanTensorHook(loss),
_LoggerHook()
],
config=tf.ConfigProto(log_device_placement=FLAGS.
log_device_placement)) as mon_sess:
while not mon_sess.should_stop():
mon_sess.run(train_op)
def train():
"""Train SVHN for a number of steps."""
with tf.Graph().as_default():
global_step = tf.Variable(0, trainable=False)
# Get images and labels for SVHN with mat file
images, labels = svhn.distorted_inputs()
# Build a Graph that computes the logits predictions from
# inference model.
logits = svhn.inference(images)
# Calculate loss.
loss = svhn.loss(logits, labels)
# Build a Graph that trains the model with one batch of examples
# and updates the model parm
train_op = svhn.train(loss, global_step)
# Create a saver.
saver = tf.train.Saver(tf.all_variables())
# Build an initialization operation to run.
init = tf.initialize_all_variables()
# Start running operations on the Graph.
sess = tf.Session(config=tf.ConfigProto(
log_device_placement=FLAGS.log_device_placement))
sess.run(init)
# Start the queue runners.
tf.train.start_queue_runners(sess=sess)
# summary_writer = tf.train.SummaryWriter(FLAGS.train_dir, sess.graph)
for step in xrange(FLAGS.max_steps):
start_time = time.time()
_, loss_value = sess.run([train_op, loss])
duration = time.time() - start_time
assert not np.isnan(loss_value), 'Model diverged with loss = NaN'
if step % 10 == 0:
num_examples_per_step = FLAGS.batch_size
examples_per_sec = num_examples_per_step / duration
sec_per_batch = float(duration)
format_str = (
'%s: step %d, loss = %.2f (%.1f examples/sec; %.3f '
'sec/batch)')
print(format_str % (datetime.now(), step, loss_value,
examples_per_sec, sec_per_batch))
# Save the model checkpoint periodically.
if step % 1000 == 0 or (step + 1) == FLAGS.max_steps:
checkpoint_path = os.path.join(FLAGS.train_dir, 'model.ckpt')
saver.save(sess, checkpoint_path, global_step=step)
def train():
with tf.Graph().as_default() as graph:
global_step = tf.Variable(0, trainable=False)
# Get images and labels for CIFAR-10.
images, labels = svhn.distorted_inputs()
logits1, logits2, logits3, logits4, logits5, logits6 = svhn.net_1(
images, 0.71)
loss = svhn.loss(logits1, logits2, logits3, logits4, logits5, logits6,
labels)
pred = tf.stack([tf.argmax(tf.nn.softmax(logits1), 1),\
tf.argmax(tf.nn.softmax(logits2), 1),\
tf.argmax(tf.nn.softmax(logits3), 1),\
tf.argmax(tf.nn.softmax(logits4), 1),\
tf.argmax(tf.nn.softmax(logits5), 1),\
tf.argmax(tf.nn.softmax(logits6), 1)], axis=1)
# Build a Graph that trains the model with one batch of examples and
# updates the model parameters.
train_op = svhn.train(loss, global_step)
# Build the summary operation based on the TF collection of Summaries.
summary_op = tf.summary.merge_all()
# Build an initialization operation to run below.
init = tf.global_variables_initializer()
with tf.Session() as sess:
sess.run(init)
variable_averages = tf.train.ExponentialMovingAverage(
svhn.MOVING_AVERAGE_DECAY)
variables_to_restore = variable_averages.variables_to_restore()
saver = tf.train.Saver(variables_to_restore)
ckpt = tf.train.get_checkpoint_state(FLAGS.checkpoint_dir)
if ckpt and ckpt.model_checkpoint_path:
saver.restore(sess, ckpt.model_checkpoint_path)
""" Save Whole Model to model.pb
for v in tf.trainable_variables():
# assign the ExponentialMovingAverage value to the real variable
name = v.name.split(':')[0]+'/ExponentialMovingAverage'
sess.run(tf.assign(v, variables_to_restore[name]))
out_graph_def = graph_util.convert_variables_to_constants(sess, graph.as_graph_def(), ['out1/Add','out2/Add','out3/Add','out4/Add','out5/Add','out6/Add', 'shuffle_batch'])
with tf.gfile.GFile("model.pb", "wb") as f:
f.write(out_graph_def.SerializeToString())
"""
tf.train.start_queue_runners(sess=sess)
summary_writer = tf.summary.FileWriter(FLAGS.train_dir,
graph=sess.graph)
for step in xrange(FLAGS.max_steps):
start_time = time.time()
_, loss_value, prediction, label = sess.run(
[train_op, loss, pred, labels])
duration = time.time() - start_time
assert not np.isnan(
loss_value), 'Model diverged with loss = NaN'
if step % 100 == 0:
num_examples_per_step = FLAGS.batch_size
examples_per_sec = num_examples_per_step / duration
sec_per_batch = float(duration)
true_count = 0
for x in range(num_examples_per_step):
current_pred = np.array(
prediction[x]).astype(int).tostring()
correct_pred = np.array(
label[x]).astype(int).tostring()
if current_pred == correct_pred:
true_count += 1
format_str = (
'%s: step %d, loss = %.6f, acc = %.6f%% (%.1f examples/sec; %.3f '
'sec/batch)')
print(format_str % (datetime.now(), step, loss_value, 100 *
(true_count / num_examples_per_step),
examples_per_sec, sec_per_batch))
# print(prediction)
if step % 100 == 0:
summary_str = sess.run(summary_op)
summary_writer.add_summary(summary_str, step)
# Save the model checkpoint periodically.
if step % 1000 == 0 or (step + 1) == FLAGS.max_steps:
checkpoint_path = os.path.join(FLAGS.train_dir,
'model.ckpt')
saver.save(sess, checkpoint_path, global_step=step)