def train():
'''
Main script.
'''
args = get_args()
from numpy.random import seed
seed(0)
# Get context.
from nnabla.ext_utils import get_extension_context
logger.info("Running in %s" % args.context)
ctx = get_extension_context(args.context,
device_id=args.device_id,
type_config=args.type_config)
nn.set_default_context(ctx)
# TRAIN
image = nn.Variable([args.batch_size, 1, 28, 28])
label = nn.Variable([args.batch_size, 1])
x = image / 255.0
t_onehot = F.one_hot(label, (10, ))
with nn.parameter_scope("capsnet"):
c1, pcaps, u_hat, caps, pred = model.capsule_net(
x,
test=False,
aug=True,
grad_dynamic_routing=args.grad_dynamic_routing)
with nn.parameter_scope("capsnet_reconst"):
recon = model.capsule_reconstruction(caps, t_onehot)
loss_margin, loss_reconst, loss = model.capsule_loss(
pred, t_onehot, recon, x)
pred.persistent = True
# TEST
# Create input variables.
vimage = nn.Variable([args.batch_size, 1, 28, 28])
vlabel = nn.Variable([args.batch_size, 1])
vx = vimage / 255.0
with nn.parameter_scope("capsnet"):
_, _, _, _, vpred = model.capsule_net(vx, test=True, aug=False)
# Create Solver.
solver = S.Adam(args.learning_rate)
solver.set_parameters(nn.get_parameters())
# Create monitor.
from nnabla.monitor import Monitor, MonitorSeries, MonitorTimeElapsed
train_iter = int(60000 / args.batch_size)
val_iter = int(10000 / args.batch_size)
logger.info("#Train: {} #Validation: {}".format(train_iter, val_iter))
monitor = Monitor(args.monitor_path)
monitor_loss = MonitorSeries("Training loss", monitor, interval=1)
monitor_mloss = MonitorSeries("Training margin loss", monitor, interval=1)
monitor_rloss = MonitorSeries("Training reconstruction loss",
monitor,
interval=1)
monitor_err = MonitorSeries("Training error", monitor, interval=1)
monitor_time = MonitorTimeElapsed("Training time", monitor, interval=1)
monitor_verr = MonitorSeries("Test error", monitor, interval=1)
monitor_lr = MonitorSeries("Learning rate", monitor, interval=1)
# To_save_nnp
m_image, m_label, m_noise, m_recon = model_tweak_digitscaps(
args.batch_size)
contents = save_nnp({
'x1': m_image,
'x2': m_label,
'x3': m_noise
}, {'y': m_recon}, args.batch_size)
save.save(os.path.join(args.monitor_path, 'capsnet_epoch0_result.nnp'),
contents)
# Initialize DataIterator for MNIST.
from numpy.random import RandomState
data = data_iterator_mnist(args.batch_size, True, rng=RandomState(1223))
vdata = data_iterator_mnist(args.batch_size, False)
start_point = 0
if args.checkpoint is not None:
# load weights and solver state info from specified checkpoint file.
start_point = load_checkpoint(args.checkpoint, solver)
# Training loop.
for e in range(start_point, args.max_epochs):
# Learning rate decay
learning_rate = solver.learning_rate()
if e != 0:
learning_rate *= 0.9
solver.set_learning_rate(learning_rate)
monitor_lr.add(e, learning_rate)
# Training
train_error = 0.0
train_loss = 0.0
train_mloss = 0.0
train_rloss = 0.0
for i in range(train_iter):
image.d, label.d = data.next()
solver.zero_grad()
loss.forward(clear_no_need_grad=True)
loss.backward(clear_buffer=True)
solver.update()
train_error += categorical_error(pred.d, label.d)
train_loss += loss.d
train_mloss += loss_margin.d
train_rloss += loss_reconst.d
train_error /= train_iter
train_loss /= train_iter
train_mloss /= train_iter
train_rloss /= train_iter
# Validation
val_error = 0.0
for j in range(val_iter):
vimage.d, vlabel.d = vdata.next()
vpred.forward(clear_buffer=True)
val_error += categorical_error(vpred.d, vlabel.d)
val_error /= val_iter
# Monitor
monitor_time.add(e)
monitor_loss.add(e, train_loss)
monitor_mloss.add(e, train_mloss)
monitor_rloss.add(e, train_rloss)
monitor_err.add(e, train_error)
monitor_verr.add(e, val_error)
save_checkpoint(args.monitor_path, e, solver)
# To_save_nnp
contents = save_nnp({
'x1': m_image,
'x2': m_label,
'x3': m_noise
}, {'y': m_recon}, args.batch_size)
save.save(os.path.join(args.monitor_path, 'capsnet_result.nnp'), contents)
def train():
'''
Main script.
'''
args = get_args()
from numpy.random import seed
seed(0)
# Get context.
from nnabla.contrib.context import extension_context
extension_module = args.context
if args.context is None:
extension_module = 'cpu'
logger.info("Running in %s" % extension_module)
ctx = extension_context(extension_module, device_id=args.device_id)
nn.set_default_context(ctx)
# TRAIN
image = nn.Variable([args.batch_size, 1, 28, 28])
label = nn.Variable([args.batch_size, 1])
x = image / 255.0
t_onehot = F.one_hot(label, (10, ))
with nn.parameter_scope("capsnet"):
c1, pcaps, u_hat, caps, pred = model.capsule_net(
x,
test=False,
aug=True,
grad_dynamic_routing=args.grad_dynamic_routing)
with nn.parameter_scope("capsnet_reconst"):
recon = model.capsule_reconstruction(caps, t_onehot)
loss_margin, loss_reconst, loss = model.capsule_loss(
pred, t_onehot, recon, x)
pred.persistent = True
# TEST
# Create input variables.
vimage = nn.Variable([args.batch_size, 1, 28, 28])
vlabel = nn.Variable([args.batch_size, 1])
vx = vimage / 255.0
with nn.parameter_scope("capsnet"):
_, _, _, _, vpred = model.capsule_net(vx, test=True, aug=False)
# Create Solver.
solver = S.Adam(args.learning_rate)
solver.set_parameters(nn.get_parameters())
# Create monitor.
from nnabla.monitor import Monitor, MonitorSeries, MonitorTimeElapsed
train_iter = int(60000 / args.batch_size)
val_iter = int(10000 / args.batch_size)
logger.info("#Train: {} #Validation: {}".format(train_iter, val_iter))
monitor = Monitor(args.monitor_path)
monitor_loss = MonitorSeries("Training loss", monitor, interval=1)
monitor_mloss = MonitorSeries("Training margin loss", monitor, interval=1)
monitor_rloss = MonitorSeries("Training reconstruction loss",
monitor,
interval=1)
monitor_err = MonitorSeries("Training error", monitor, interval=1)
monitor_time = MonitorTimeElapsed("Training time", monitor, interval=1)
monitor_verr = MonitorSeries("Test error", monitor, interval=1)
monitor_lr = MonitorSeries("Learning rate", monitor, interval=1)
# Initialize DataIterator for MNIST.
from numpy.random import RandomState
data = data_iterator_mnist(args.batch_size, True, rng=RandomState(1223))
vdata = data_iterator_mnist(args.batch_size, False)
# Training loop.
for e in range(args.max_epochs):
# Learning rate decay
learning_rate = solver.learning_rate()
if e != 0:
learning_rate *= 0.9
solver.set_learning_rate(learning_rate)
monitor_lr.add(e, learning_rate)
# Training
train_error = 0.0
train_loss = 0.0
train_mloss = 0.0
train_rloss = 0.0
for i in range(train_iter):
image.d, label.d = data.next()
solver.zero_grad()
loss.forward(clear_no_need_grad=True)
loss.backward(clear_buffer=True)
solver.update()
train_error += categorical_error(pred.d, label.d)
train_loss += loss.d
train_mloss += loss_margin.d
train_rloss += loss_reconst.d
train_error /= train_iter
train_loss /= train_iter
train_mloss /= train_iter
train_rloss /= train_iter
# Validation
val_error = 0.0
for j in range(val_iter):
vimage.d, vlabel.d = vdata.next()
vpred.forward(clear_buffer=True)
val_error += categorical_error(vpred.d, vlabel.d)
val_error /= val_iter
# Monitor
monitor_time.add(e)
monitor_loss.add(e, train_loss)
monitor_mloss.add(e, train_mloss)
monitor_rloss.add(e, train_rloss)
monitor_err.add(e, train_error)
monitor_verr.add(e, val_error)
nn.save_parameters(
os.path.join(args.monitor_path, 'params_%06d.h5' % e))