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#!/usr/bin/env python2
import cPickle
import importlib
import logging
import operator
import os
import sys
from functools import reduce
from theano import tensor
from blocks import roles
from blocks.algorithms import AdaDelta, CompositeRule, GradientDescent, RemoveNotFinite, StepRule, Momentum
from blocks.extensions import Printing, FinishAfter, SimpleExtension
from blocks.extensions.monitoring import DataStreamMonitoring, TrainingDataMonitoring
try:
from blocks.extras.extensions.plotting import Plot
use_plot = True
except ImportError:
use_plot = False
from blocks.filter import VariableFilter
from blocks.graph import ComputationGraph, apply_dropout, apply_noise
from blocks.main_loop import MainLoop
from blocks.model import Model
logger = logging.getLogger(__name__)
class ElementwiseRemoveNotFinite(StepRule):
"""A step rule that replaces non-finite coefficients by zeros.
Replaces non-finite elements (such as ``inf`` or ``NaN``) in a step
(the parameter update of a single shared variable)
with a scaled version of the parameters being updated instead.
Parameters
----------
scaler : float, optional
The scaling applied to the parameter in case the step contains
non-finite elements. Defaults to 0.1.
Notes
-----
This trick was originally used in the GroundHog_ framework.
.. _GroundHog: https://github.com/lisa-groundhog/GroundHog
"""
def __init__(self, scaler=0.1):
self.scaler = scaler
def compute_step(self, param, previous_step):
not_finite = tensor.isnan(previous_step) + tensor.isinf(previous_step)
step = tensor.switch(not_finite, self.scaler * param, previous_step)
return step, []
class SaveLoadParams(SimpleExtension):
def __init__(self, path, model, **kwargs):
super(SaveLoadParams, self).__init__(**kwargs)
self.path = path
self.model = model
def do_save(self):
with open(self.path, 'w') as f:
logger.info('Saving parameters to %s...'%self.path)
cPickle.dump(self.model.get_param_values(), f, protocol=cPickle.HIGHEST_PROTOCOL)
def do_load(self):
try:
with open(self.path, 'r') as f:
logger.info('Loading parameters from %s...'%self.path)
self.model.set_param_values(cPickle.load(f))
except IOError:
pass
def do(self, which_callback, *args):
if which_callback == 'before_training':
self.do_load()
else:
self.do_save()
if __name__ == "__main__":
if len(sys.argv) != 2:
print >> sys.stderr, 'Usage: %s config' % sys.argv[0]
sys.exit(1)
model_name = sys.argv[1]
config = importlib.import_module('.%s' % model_name, 'config')
logger.info('# Configuration: %s' % config.__name__)
for key in dir(config):
if not key.startswith('__') and isinstance(getattr(config, key), (int, str, list, tuple)):
logger.info(' %20s %s' % (key, str(getattr(config, key))))
model = config.Model(config)
model.initialize()
stream = config.Stream(config)
inputs = stream.inputs()
req_vars = model.cost.inputs
train_stream = stream.train(req_vars)
valid_stream = stream.valid(req_vars)
cost = model.cost(**inputs)
cg = ComputationGraph(cost)
monitored = set([cost] + VariableFilter(roles=[roles.COST])(cg.variables))
valid_monitored = monitored
if hasattr(model, 'valid_cost'):
valid_cost = model.valid_cost(**inputs)
valid_cg = ComputationGraph(valid_cost)
valid_monitored = set([valid_cost] + VariableFilter(roles=[roles.COST])(valid_cg.variables))
if hasattr(config, 'dropout') and config.dropout < 1.0:
cg = apply_dropout(cg, config.dropout_inputs(cg), config.dropout)
if hasattr(config, 'noise') and config.noise > 0.0:
cg = apply_noise(cg, config.noise_inputs(cg), config.noise)
cost = cg.outputs[0]
cg = Model(cost)
logger.info('# Parameter shapes:')
parameters_size = 0
for key, value in cg.get_params().iteritems():
logger.info(' %20s %s' % (value.get_value().shape, key))
parameters_size += reduce(operator.mul, value.get_value().shape, 1)
logger.info('Total number of parameters: %d in %d matrices' % (parameters_size, len(cg.get_params())))
params = cg.parameters
algorithm = GradientDescent(
cost=cost,
step_rule=CompositeRule([
ElementwiseRemoveNotFinite(),
config.step_rule,
]),
params=params)
plot_vars = [['valid_' + x.name for x in valid_monitored]]
logger.info('Plotted variables: %s' % str(plot_vars))
dump_path = os.path.join('model_data', model_name) + '.pkl'
logger.info('Dump path: %s' % dump_path)
extensions=[TrainingDataMonitoring(monitored, prefix='train', every_n_batches=1000),
DataStreamMonitoring(valid_monitored, valid_stream,
prefix='valid',
every_n_batches=1000),
Printing(every_n_batches=1000),
SaveLoadParams(dump_path, cg,
before_training=config.load_model, # before training -> load params
every_n_batches=1000, # every N batches -> save params
),
]
if use_plot:
extensions.append(Plot(model_name, channels=plot_vars, every_n_batches=500))
main_loop = MainLoop(
model=cg,
data_stream=train_stream,
algorithm=algorithm,
extensions=extensions)
main_loop.run()
main_loop.profile.report()
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