def main():
'''
Entry point of this script.
'''
args = parse_args()
# Hyperparameter values taken from Pylearn2:
# In pylearn2/scripts/tutorials/convolutional_network/:
# convolutional_network.ipynb
filter_counts = [64, 64]
filter_init_uniform_ranges = [.05] * len(filter_counts)
filter_shapes = [(5, 5), (5, 5)]
pool_shapes = [(4, 4), (4, 4)]
pool_strides = [(2, 2), (2, 2)]
affine_output_sizes = [10]
affine_init_stddevs = [.05] * len(affine_output_sizes)
dropout_include_rates = ([.5 if args.dropout else 1.0] *
(len(filter_counts) + len(affine_output_sizes)))
assert_equal(affine_output_sizes[-1], 10)
mnist_training, mnist_testing = load_mnist()
# split training set into training and validation sets
tensors = mnist_training.tensors
training_tensors = [t[:-args.validation_size, ...] for t in tensors]
validation_tensors = [t[-args.validation_size:, ...] for t in tensors]
if args.no_shuffle_dataset == False:
def shuffle_in_unison_inplace(a, b):
assert len(a) == len(b)
p = numpy.random.permutation(len(a))
return a[p], b[p]
[training_tensors[0],training_tensors[1]] = shuffle_in_unison_inplace(training_tensors[0],training_tensors[1])
[validation_tensors[0], validation_tensors[1]] = shuffle_in_unison_inplace(validation_tensors[0], validation_tensors[1])
all_images_shared = theano.shared(numpy.vstack([training_tensors[0],validation_tensors[0]]))
all_labels_shared = theano.shared(numpy.concatenate([training_tensors[1],validation_tensors[1]]))
length_training = training_tensors[0].shape[0]
length_validation = validation_tensors[0].shape[0]
indices_training = numpy.asarray(range(length_training))
indices_validation = numpy.asarray(range(length_training, length_training + length_validation))
indices_training_dataset = Dataset( tensors=[indices_training], names=['indices'], formats=[DenseFormat(axes=['b'],shape=[-1],dtype='int64')] )
indices_validation_dataset = Dataset( tensors=[indices_validation], names=['indices'], formats=[DenseFormat(axes=['b'],shape=[-1],dtype='int64')] )
indices_training_iterator = indices_training_dataset.iterator(iterator_type='sequential',batch_size=args.batch_size)
indices_validation_iterator = indices_validation_dataset.iterator(iterator_type='sequential',batch_size=args.batch_size)
mnist_validation_iterator = indices_validation_iterator
mnist_training_iterator = indices_training_iterator
input_indices_symbolic, = indices_training_iterator.make_input_nodes()
image_lookup_node = ImageLookeupNode(input_indices_symbolic, all_images_shared)
label_lookup_node = LabelLookeupNode(input_indices_symbolic, all_labels_shared)
image_node = RescaleImage(image_lookup_node)
rng = numpy.random.RandomState(129734)
theano_rng = RandomStreams(2387845)
(conv_layers,
affine_layers,
output_node) = build_conv_classifier(image_node,
filter_shapes,
filter_counts,
filter_init_uniform_ranges,
pool_shapes,
pool_strides,
affine_output_sizes,
affine_init_stddevs,
dropout_include_rates,
rng,
theano_rng)
loss_node = CrossEntropy(output_node, label_lookup_node)
scalar_loss = loss_node.output_symbol.mean()
if args.weight_decay != 0.0:
for conv_layer in conv_layers:
filters = conv_layer.conv2d_node.filters
filter_loss = args.weight_decay * theano.tensor.sqr(filters).sum()
scalar_loss = scalar_loss + filter_loss
for affine_layer in affine_layers:
weights = affine_layer.affine_node.linear_node.params
weight_loss = args.weight_decay * theano.tensor.sqr(weights).sum()
scalar_loss = scalar_loss + weight_loss
max_epochs = 200
#
# Makes parameter updaters
#
parameters = []
parameter_updaters = []
def add_updaters(parameter,
scalar_loss,
parameter_updaters):
'''
Adds a ParameterUpdater to parameter_updaters, and a
LinearlyInterpolatesOverEpochs to momentum_updaters.
'''
gradient = theano.gradient.grad(scalar_loss, parameter)
parameter_updaters.append(SgdParameterUpdater(parameter,
gradient,
args.learning_rate))
for conv_layer in conv_layers:
filters = conv_layer.conv2d_node.filters
parameters.append(filters)
add_updaters(filters,
scalar_loss,
parameter_updaters)
if args.max_filter_norm != numpy.inf:
limit_param_norms(parameter_updaters[-1],
filters,
args.max_filter_norm,
(1, 2, 3))
bias = conv_layer.bias_node.params
parameters.append(bias)
add_updaters(bias,
scalar_loss,
parameter_updaters)
for affine_layer in affine_layers:
weights = affine_layer.affine_node.linear_node.params
parameters.append(weights)
add_updaters(weights,
scalar_loss,
parameter_updaters)
if args.max_col_norm != numpy.inf:
limit_param_norms(parameter_updater=parameter_updaters[-1],
param=weights,
max_norm=args.max_col_norm,
input_axes=[0])
biases = affine_layer.affine_node.bias_node.params
parameters.append(biases)
add_updaters(biases,
scalar_loss,
parameter_updaters)
#
# Makes batch and epoch callbacks
#
'''
def make_output_filename(args, best=False):
Constructs a filename that reflects the command-line params.
assert_equal(os.path.splitext(args.output_prefix)[1], "")
if os.path.isdir(args.output_prefix):
output_dir, output_prefix = args.output_prefix, ""
else:
output_dir, output_prefix = os.path.split(args.output_prefix)
assert_true(os.path.isdir(output_dir))
if output_prefix != "":
output_prefix = output_prefix + "_"
output_prefix = os.path.join(output_dir, output_prefix)
return ("%slr-%g_mom-%g_nesterov-%s_bs-%d%s.pkl" %
(output_prefix,
args.learning_rate,
args.initial_momentum,
args.nesterov,
args.batch_size,
"_best" if best else ""))
'''
assert_equal(os.path.splitext(args.output_prefix)[1], "")
if os.path.isdir(args.output_prefix) and \
not args.output_prefix.endswith('/'):
args.output_prefix += '/'
output_dir, output_prefix = os.path.split(args.output_prefix)
if output_prefix != "":
output_prefix = output_prefix + "_"
output_prefix = os.path.join(output_dir, output_prefix)
epoch_logger = EpochLogger(output_prefix + "SGD.h5")
misclassification_node = Misclassification(output_node, label_lookup_node)
validation_loss_monitor = MeanOverEpoch(loss_node, callbacks=[])
epoch_logger.subscribe_to('validation mean loss', validation_loss_monitor)
training_stopper = StopsOnStagnation(max_epochs=20,
min_proportional_decrease=0.0)
validation_misclassification_monitor = MeanOverEpoch(misclassification_node,
callbacks=[print_misclassification_rate,
training_stopper])
epoch_logger.subscribe_to('validation misclassification',
validation_misclassification_monitor)
# batch callback (monitor)
#training_loss_logger = LogsToLists()
training_loss_monitor = MeanOverEpoch(loss_node,
callbacks=[print_loss])
epoch_logger.subscribe_to("training loss", training_loss_monitor)
training_misclassification_monitor = MeanOverEpoch(misclassification_node,
callbacks=[])
epoch_logger.subscribe_to('training misclassification %',
training_misclassification_monitor)
epoch_timer = EpochTimer2()
epoch_logger.subscribe_to('epoch duration', epoch_timer)
# epoch_logger.subscribe_to('epoch time',
# epoch_timer)
#################
#model = SerializableModel([input_indices_symbolic], [output_node])
#saves_best = SavesAtMinimum(model, make_output_filename(args, best=True))
validation_loss_monitor = MeanOverEpoch(loss_node,
callbacks=[])
epoch_logger.subscribe_to("Validation Loss", validation_loss_monitor)
validation_callback = ValidationCallback(
inputs=[input_indices_symbolic.output_symbol],
input_iterator=mnist_validation_iterator,
epoch_callbacks=[validation_loss_monitor,
validation_misclassification_monitor])
# trainer = Sgd((image_node.output_symbol, label_node.output_symbol),
trainer = Sgd([input_indices_symbolic],
mnist_training_iterator,
callbacks=(parameter_updaters + [#training_loss_monitor,
#training_misclassification_monitor,
validation_callback]))
'''
stuff_to_pickle = OrderedDict(
(('model', model),
('validation_loss_logger', validation_loss_logger)))
# Pickling the trainer doesn't work when there are Dropout nodes.
# stuff_to_pickle = OrderedDict(
# (('trainer', trainer),
# ('validation_loss_logger', validation_loss_logger),
# ('model', model)))
trainer.epoch_callbacks += (momentum_updaters +
[EpochTimer(),
PicklesOnEpoch(stuff_to_pickle,
make_output_filename(args),
overwrite=False),
validation_callback,
LimitsNumEpochs(max_epochs)])
'''
trainer.epoch_callbacks += ([LimitsNumEpochs(max_epochs),
epoch_timer])
start_time = time.time()
trainer.train()
elapsed_time = time.time() - start_time
print("Total elapsed time is for training is: ", elapsed_time)
def main():
args = parse_args()
# Hyperparameter values taken from Pylearn2:
# In pylearn2/scripts/tutorials/multilayer_perceptron/:
# multilayer_perceptron.ipynb
# mlp_tutorial_part_3.yaml
sizes = [500, 500, 10]
sparse_init_counts = [15, 15]
assert_equal(len(sparse_init_counts), len(sizes) - 1)
assert_equal(sizes[-1], 10)
mnist_training, mnist_testing = load_mnist()
# split training set into training and validation sets
tensors = mnist_training.tensors
training_tensors = [t[:-args.validation_size, ...] for t in tensors]
validation_tensors = [t[-args.validation_size:, ...] for t in tensors]
if args.no_shuffle_dataset == False:
def shuffle_in_unison_inplace(a, b):
assert len(a) == len(b)
p = numpy.random.permutation(len(a))
return a[p], b[p]
[training_tensors[0],training_tensors[1]] = shuffle_in_unison_inplace(training_tensors[0],training_tensors[1])
[validation_tensors[0], validation_tensors[1]] = shuffle_in_unison_inplace(validation_tensors[0], validation_tensors[1])
all_images_shared = theano.shared(numpy.vstack([training_tensors[0],validation_tensors[0]]))
all_labels_shared = theano.shared(numpy.concatenate([training_tensors[1],validation_tensors[1]]))
length_training = training_tensors[0].shape[0]
length_validation = validation_tensors[0].shape[0]
indices_training = numpy.asarray(range(length_training))
indices_validation = numpy.asarray(range(length_training, length_training + length_validation))
indices_training_dataset = Dataset( tensors=[indices_training], names=['indices'], formats=[DenseFormat(axes=['b'],shape=[-1],dtype='int64')] )
indices_validation_dataset = Dataset( tensors=[indices_validation], names=['indices'], formats=[DenseFormat(axes=['b'],shape=[-1],dtype='int64')] )
indices_training_iterator = indices_training_dataset.iterator(iterator_type='sequential',batch_size=args.batch_size)
indices_validation_iterator = indices_validation_dataset.iterator(iterator_type='sequential',batch_size=10000)
mnist_validation_iterator = indices_validation_iterator
mnist_training_iterator = indices_training_iterator
input_indices_symbolic, = indices_training_iterator.make_input_nodes()
image_lookup_node = ImageLookeupNode(input_indices_symbolic, all_images_shared)
label_lookup_node = LabelLookeupNode(input_indices_symbolic, all_labels_shared)
image_node = CastNode(image_lookup_node, 'floatX')
# image_node = RescaleImage(image_uint8_node)
rng = numpy.random.RandomState(34523)
theano_rng = RandomStreams(23845)
(affine_nodes,
output_node) = build_fc_classifier(image_node,
sizes,
sparse_init_counts,
args.dropout_include_rates,
rng,
theano_rng)
loss_node = CrossEntropy(output_node, label_lookup_node)
loss_sum = loss_node.output_symbol.mean()
max_epochs = 200
#
# Makes parameter updaters
#
parameters = []
parameter_updaters = []
for affine_node in affine_nodes:
for params in (affine_node.linear_node.params,
affine_node.bias_node.params):
parameters.append(params)
gradients = theano.gradient.grad(loss_sum, params)
parameter_updater = SgdParameterUpdater(params,
gradients,
args.learning_rate)
parameter_updaters.append(parameter_updater)
#
# Makes batch and epoch callbacks
#
'''
def make_output_basename(args):
assert_equal(os.path.splitext(args.output_prefix)[1], "")
if os.path.isdir(args.output_prefix) and \
not args.output_prefix.endswith('/'):
args.output_prefix += '/'
output_dir, output_prefix = os.path.split(args.output_prefix)
if output_prefix != "":
output_prefix = output_prefix + "_"
output_prefix = os.path.join(output_dir, output_prefix)
return "{}lr-{}_mom-{}_nesterov-{}_bs-{}".format(
output_prefix,
args.learning_rate,
args.initial_momentum,
args.nesterov,
args.batch_size)
'''
assert_equal(os.path.splitext(args.output_prefix)[1], "")
if os.path.isdir(args.output_prefix) and \
not args.output_prefix.endswith('/'):
args.output_prefix += '/'
output_dir, output_prefix = os.path.split(args.output_prefix)
if output_prefix != "":
output_prefix = output_prefix + "_"
output_prefix = os.path.join(output_dir, output_prefix)
epoch_logger = EpochLogger(output_prefix + "SGD.h5")
# misclassification_node = Misclassification(output_node, label_node)
# mcr_logger = LogsToLists()
# training_stopper = StopsOnStagnation(max_epochs=10,
# min_proportional_decrease=0.0)
misclassification_node = Misclassification(output_node, label_lookup_node)
validation_loss_monitor = MeanOverEpoch(loss_node, callbacks=[])
epoch_logger.subscribe_to('validation mean loss', validation_loss_monitor)
validation_misclassification_monitor = MeanOverEpoch(
misclassification_node,
callbacks=[print_mcr,
StopsOnStagnation(max_epochs=20,
min_proportional_decrease=0.0)])
epoch_logger.subscribe_to('validation misclassification',
validation_misclassification_monitor)
# batch callback (monitor)
# training_loss_logger = LogsToLists()
training_loss_monitor = MeanOverEpoch(loss_node, callbacks=[print_loss])
epoch_logger.subscribe_to('training mean loss', training_loss_monitor)
training_misclassification_monitor = MeanOverEpoch(misclassification_node,
callbacks=[])
epoch_logger.subscribe_to('training misclassification %',
training_misclassification_monitor)
# epoch callbacks
# validation_loss_logger = LogsToLists()
def make_output_filename(args, best=False):
basename = make_output_basename(args)
return "{}{}.pkl".format(basename, '_best' if best else "")
#model = SerializableModel([input_indices_symbolic], [output_node])
#saves_best = SavesAtMinimum(model, make_output_filename(args, best=True))
validation_loss_monitor = MeanOverEpoch(
loss_node,
callbacks=[])
epoch_logger.subscribe_to('validation loss', validation_loss_monitor)
epoch_timer = EpochTimer2()
epoch_logger.subscribe_to('epoch duration', epoch_timer)
validation_callback = ValidationCallback(
inputs=[input_indices_symbolic.output_symbol],
input_iterator=mnist_validation_iterator,
epoch_callbacks=[validation_loss_monitor,
validation_misclassification_monitor])
trainer = Sgd([input_indices_symbolic],
mnist_training_iterator,
callbacks=(parameter_updaters +
[#training_loss_monitor,
#training_misclassification_monitor,
validation_callback,
LimitsNumEpochs(max_epochs),
epoch_timer]))
# validation_loss_monitor]))
# stuff_to_pickle = OrderedDict(
# (('model', model),
# ('validation_loss_logger', validation_loss_logger)))
# Pickling the trainer doesn't work when there are Dropout nodes.
# stuff_to_pickle = OrderedDict(
# (('trainer', trainer),
# ('validation_loss_logger', validation_loss_logger),
# ('model', model)))
# trainer.epoch_callbacks += (momentum_updaters +
# [PicklesOnEpoch(stuff_to_pickle,
# make_output_filename(args),
# overwrite=False),
# validation_callback,
# LimitsNumEpochs(max_epochs)])
start_time = time.time()
trainer.train()
elapsed_time = time.time() - start_time
print("Total elapsed time is for training is: ", elapsed_time)
