NeuralTrainer.run() - Code Metrics - Inspection of "Changed interface of TrainController" - zomux/deepy - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( eef17b...3c911b )

by Raphael

created 2016-07-18 13:04 UTC

NeuralTrainer.run() F

↳ Parent: NeuralTrainer

Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes	2
Bugs	0	Features	0

Metric	Value
cc	11
dl	0
loc	24
rs	3.3409
c	2
b	0
f	0

How to fix Complexity

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
import numpy as np
import theano

from deepy.conf import TrainerConfig
from deepy.dataset import Dataset
from deepy.utils import Timer

from abc import ABCMeta, abstractmethod

from logging import getLogger
logging = getLogger("trainer")

class NeuralTrainer(object):
    """
    A base class for all trainers.
    """
    __metaclass__ = ABCMeta

    def __init__(self, network, config=None):
        """
        Basic neural network trainer.
        :type network: deepy.NeuralNetwork
        :type config: deepy.conf.TrainerConfig
        :return:
        """
        super(NeuralTrainer, self).__init__()

        self.config = None
        if isinstance(config, TrainerConfig):
            self.config = config
        elif isinstance(config, dict):
            self.config = TrainerConfig(config)
        else:
            self.config = TrainerConfig()
        # Model and network all refer to the computational graph
        self.model = self.network = network

        self.network.prepare_training()
        self._setup_costs()

        self.evaluation_func = None

        self.validation_frequency = self.config.validation_frequency
        self.min_improvement = self.config.min_improvement
        self.patience = self.config.patience
        self._iter_callbacks = []

        self.best_cost = 1e100
        self.best_iter = 0
        self.best_params = self.copy_params()
        self._skip_batches = 0
        self._progress = 0
        self.last_cost = 0
        self.last_run_costs = None
        self._report_time = True

    def _compile_evaluation_func(self):
        if not self.evaluation_func:
            logging.info("compile evaluation function")
            self.evaluation_func = theano.function(
                self.network.input_variables + self.network.target_variables,
                self.evaluation_variables,
                updates=self.network.updates,
                allow_input_downcast=True, mode=self.config.get("theano_mode", None))

    def skip(self, n_batches):
        """
        Skip N batches in the training.
        """
        logging.info("Skip %d batches" % n_batches)
        self._skip_batches = n_batches

    def _setup_costs(self):
        self.cost = self._add_regularization(self.network.cost)
        self.test_cost = self._add_regularization(self.network.test_cost)
        self.training_variables = [self.cost]
        self.training_names = ['J']
        for name, monitor in self.network.training_monitors:
            self.training_names.append(name)
            self.training_variables.append(monitor)
        logging.info("monitor list: %s" % ",".join(self.training_names))

        self.evaluation_variables = [self.test_cost]
        self.evaluation_names = ['J']
        for name, monitor in self.network.testing_monitors:
            self.evaluation_names.append(name)
            self.evaluation_variables.append(monitor)

    def _add_regularization(self, cost):
        if self.config.weight_l1 > 0:
            logging.info("L1 weight regularization: %f" % self.config.weight_l1)
            cost += self.config.weight_l1 * sum(abs(w).sum() for w in self.network.parameters)
        if self.config.hidden_l1 > 0:
            logging.info("L1 hidden unit regularization: %f" % self.config.hidden_l1)
            cost += self.config.hidden_l1 * sum(abs(h).mean(axis=0).sum() for h in self.network._hidden_outputs)
        if self.config.hidden_l2 > 0:
            logging.info("L2 hidden unit regularization: %f" % self.config.hidden_l2)
            cost += self.config.hidden_l2 * sum((h * h).mean(axis=0).sum() for h in self.network._hidden_outputs)

        return cost

    def set_params(self, targets, free_params=None):
        for param, target in zip(self.network.parameters, targets):
            param.set_value(target)
        if free_params:
            for param, param_value in zip(self.network.free_parameters, free_params):
                param.set_value(param_value)

    def save_params(self, path):
        self.set_params(*self.best_params)
        self.network.save_params(path)

    def load_params(self, path, exclude_free_params=False):
        """
        Load parameters for the training.
        This method can load free parameters and resume the training progress.
        """
        self.network.load_params(path, exclude_free_params=exclude_free_params)
        self.best_params = self.copy_params()
        # Resume the progress
        if self.network.train_logger.progress() > 0:
            self.skip(self.network.train_logger.progress())

    def copy_params(self):
        checkpoint = (map(lambda p: p.get_value().copy(), self.network.parameters),
                      map(lambda p: p.get_value().copy(), self.network.free_parameters))
        return checkpoint

    def add_iter_callback(self, func):
        """
        Add a iteration callback function (receives an argument of the trainer).
        :return:
        """
        self._iter_callbacks.append(func)

    def train(self, train_set, valid_set=None, test_set=None, train_size=None):
        """
        Train the model and return costs.
        """
        epoch = 0
        while True:
            # Test
            if not epoch % self.config.test_frequency and test_set:
                try:
                    self._run_test(epoch, test_set)
                except KeyboardInterrupt:
                    logging.info('interrupted!')
                    break
            # Validate
            if not epoch % self.validation_frequency and valid_set:
                try:

                    if not self._run_valid(epoch, valid_set):
                        logging.info('patience elapsed, bailing out')
                        break
                except KeyboardInterrupt:
                    logging.info('interrupted!')
                    break
            # Train one step
            try:
                costs = self._run_train(epoch, train_set, train_size)
            except KeyboardInterrupt:
                logging.info('interrupted!')
                break
            # Check costs
            if np.isnan(costs[0][1]):
                logging.info("NaN detected in costs, rollback to last parameters")
                self.set_params(*self.checkpoint)
            else:
                epoch += 1
                self.network.epoch_callback()

            yield dict(costs)

        if valid_set and self.config.get("save_best_parameters", True):
            self.set_params(*self.best_params)
        if test_set:
            self._run_test(-1, test_set)

    @abstractmethod
    def learn(self, *variables):
        """
        Update the parameters and return the cost with given data points.
        :param variables:
        :return:
        """

    def _run_test(self, iteration, test_set):
        """
        Run on test iteration.
        """
        costs = self.test_step(test_set)
        info = ' '.join('%s=%.2f' % el for el in costs)
        message = "test    (epoch=%i) %s" % (iteration + 1, info)
        logging.info(message)
        self.network.train_logger.record(message)
        self.last_run_costs = costs

    def _run_train(self, iteration, train_set, train_size=None):
        """
        Run one training iteration.
        """
        costs = self.train_step(train_set, train_size)
        if not iteration % self.config.monitor_frequency:
            info = " ".join("%s=%.2f" % item for item in costs)
            message = "monitor (epoch=%i) %s" % (iteration + 1, info)
            logging.info(message)
            self.network.train_logger.record(message)
        self.last_run_costs = costs
        return costs

    def _run_valid(self, iteration, valid_set, dry_run=False):
        """
        Run one valid iteration, return true if to continue training.
        """
        costs = self.valid_step(valid_set)
        # this is the same as: (J_i - J_f) / J_i > min improvement
        _, J = costs[0]
        marker = ""
        if self.best_cost - J > self.best_cost * self.min_improvement:
            # save the best cost and parameters
            self.best_params = self.copy_params()
            marker = ' *'
            if not dry_run:
                self.best_cost = J
                self.best_iter = iteration

            if self.config.auto_save:
                self.network.train_logger.record_progress(self._progress)
                self.network.save_params(self.config.auto_save, new_thread=True)

        info = ' '.join('%s=%.2f' % el for el in costs)
        epoch = "epoch=%d" % (iteration + 1)
        if dry_run:
            epoch = "dryrun" + " " * (len(epoch) - 6)
        message = "valid   (%s) %s%s" % (epoch, info, marker)
        logging.info(message)
        self.last_run_costs = costs
        self.network.train_logger.record(message)
        self.checkpoint = self.copy_params()
        return iteration - self.best_iter < self.patience

    def test_step(self, test_set):
        self._compile_evaluation_func()
        costs = list(zip(
            self.evaluation_names,
            np.mean([self.evaluation_func(*x) for x in test_set], axis=0)))
        return costs

    def valid_step(self, valid_set):
        self._compile_evaluation_func()
        costs = list(zip(
            self.evaluation_names,
            np.mean([self.evaluation_func(*x) for x in valid_set], axis=0)))
        return costs

    def train_step(self, train_set, train_size=None):
        dirty_trick_times = 0
        network_callback = bool(self.network.training_callbacks)
        trainer_callback = bool(self._iter_callbacks)
        cost_matrix = []
        self._progress = 0

        for x in train_set:
            if self._skip_batches == 0:

                if dirty_trick_times > 0:
                    cost_x = self.learn(*[t[:(t.shape[0]/2)] for t in x])
                    cost_matrix.append(cost_x)
                    cost_x = self.learn(*[t[(t.shape[0]/2):] for t in x])
                    dirty_trick_times -= 1
                else:
                    try:
                        cost_x = self.learn(*x)
                    except MemoryError:
                        logging.info("Memory error was detected, perform dirty trick 30 times")
                        dirty_trick_times = 30
                        # Dirty trick
                        cost_x = self.learn(*[t[:(t.shape[0]/2)] for t in x])
                        cost_matrix.append(cost_x)
                        cost_x = self.learn(*[t[(t.shape[0]/2):] for t in x])
                cost_matrix.append(cost_x)
                self.last_cost = cost_x[0]
                if network_callback:
                    self.network.training_callback()
                if trainer_callback:
                    for func in self._iter_callbacks:
                        func(self)
            else:
                self._skip_batches -= 1
            if train_size:
                self._progress += 1
                sys.stdout.write("\x1b[2K\r> %d%% | J=%.2f" % (self._progress * 100 / train_size, self.last_cost))
                sys.stdout.flush()
        self._progress = 0

        if train_size:
            sys.stdout.write("\r")
            sys.stdout.flush()
        costs = list(zip(self.training_names, np.mean(cost_matrix, axis=0)))
        return costs

    def run(self, train_set, valid_set=None, test_set=None, train_size=None, controllers=None):
        """
        Run until the end.
        """
        if isinstance(train_set, Dataset):
            dataset = train_set
            train_set = dataset.train_set()
            valid_set = dataset.valid_set()
            test_set = dataset.test_set()
            train_size = dataset.train_size()
        if controllers:
            for controller in controllers:
                controller.bind(self)
        timer = Timer()
        for _ in self.train(train_set, valid_set=valid_set, test_set=test_set, train_size=train_size):
            if controllers:
                ending = False
                for controller in controllers:
                    if hasattr(controller, 'invoke') and controller.invoke():
                        ending = True
                if ending:
                    break
        if self._report_time:
            timer.report()


1			#!/usr/bin/env python
2			# -- coding: utf-8 --
3			import sys
4			import numpy as np
5			import theano
6
7			from deepy.conf import TrainerConfig
8			from deepy.dataset import Dataset
9			from deepy.utils import Timer
10
11			from abc import ABCMeta, abstractmethod
12
13			from logging import getLogger
14			logging = getLogger("trainer")
15
16			class NeuralTrainer(object):
17			"""
18			A base class for all trainers.
19			"""
20			__metaclass__ = ABCMeta
21
22			def __init__(self, network, config=None):
23			"""
24			Basic neural network trainer.
25			:type network: deepy.NeuralNetwork
26			:type config: deepy.conf.TrainerConfig
27			:return:
28			"""
29			super(NeuralTrainer, self).__init__()
30
31			self.config = None
32			if isinstance(config, TrainerConfig):
33			self.config = config
34			elif isinstance(config, dict):
35			self.config = TrainerConfig(config)
36			else:
37			self.config = TrainerConfig()
38			# Model and network all refer to the computational graph
39			self.model = self.network = network
40
41			self.network.prepare_training()
42			self._setup_costs()
43
44			self.evaluation_func = None
45
46			self.validation_frequency = self.config.validation_frequency
47			self.min_improvement = self.config.min_improvement
48			self.patience = self.config.patience
49			self._iter_callbacks = []
50
51			self.best_cost = 1e100
52			self.best_iter = 0
53			self.best_params = self.copy_params()
54			self._skip_batches = 0
55			self._progress = 0
56			self.last_cost = 0
57			self.last_run_costs = None
58			self._report_time = True
59
60			def _compile_evaluation_func(self):
61			if not self.evaluation_func:
62			logging.info("compile evaluation function")
63			self.evaluation_func = theano.function(
64			self.network.input_variables + self.network.target_variables,
65			self.evaluation_variables,
66			updates=self.network.updates,
67			allow_input_downcast=True, mode=self.config.get("theano_mode", None))
68
69			def skip(self, n_batches):
70			"""
71			Skip N batches in the training.
72			"""
73			logging.info("Skip %d batches" % n_batches)
74			self._skip_batches = n_batches
75
76			def _setup_costs(self):
77			self.cost = self._add_regularization(self.network.cost)
78			self.test_cost = self._add_regularization(self.network.test_cost)
79			self.training_variables = [self.cost]
80			self.training_names = ['J']
81			for name, monitor in self.network.training_monitors:
82			self.training_names.append(name)
83			self.training_variables.append(monitor)
84			logging.info("monitor list: %s" % ",".join(self.training_names))
85
86			self.evaluation_variables = [self.test_cost]
87			self.evaluation_names = ['J']
88			for name, monitor in self.network.testing_monitors:
89			self.evaluation_names.append(name)
90			self.evaluation_variables.append(monitor)
91
92			def _add_regularization(self, cost):
93			if self.config.weight_l1 > 0:
94			logging.info("L1 weight regularization: %f" % self.config.weight_l1)
95			cost += self.config.weight_l1 * sum(abs(w).sum() for w in self.network.parameters)
96			if self.config.hidden_l1 > 0:
97			logging.info("L1 hidden unit regularization: %f" % self.config.hidden_l1)
98			cost += self.config.hidden_l1 * sum(abs(h).mean(axis=0).sum() for h in self.network._hidden_outputs)
99			if self.config.hidden_l2 > 0:
100			logging.info("L2 hidden unit regularization: %f" % self.config.hidden_l2)
101			cost += self.config.hidden_l2 * sum((h * h).mean(axis=0).sum() for h in self.network._hidden_outputs)
102
103			return cost
104
105			def set_params(self, targets, free_params=None):
106			for param, target in zip(self.network.parameters, targets):
107			param.set_value(target)
108			if free_params:
109			for param, param_value in zip(self.network.free_parameters, free_params):
110			param.set_value(param_value)
111
112			def save_params(self, path):
113			self.set_params(*self.best_params)
114			self.network.save_params(path)
115
116			def load_params(self, path, exclude_free_params=False):
117			"""
118			Load parameters for the training.
119			This method can load free parameters and resume the training progress.
120			"""
121			self.network.load_params(path, exclude_free_params=exclude_free_params)
122			self.best_params = self.copy_params()
123			# Resume the progress
124			if self.network.train_logger.progress() > 0:
125			self.skip(self.network.train_logger.progress())
126
127			def copy_params(self):
128			checkpoint = (map(lambda p: p.get_value().copy(), self.network.parameters),
129			map(lambda p: p.get_value().copy(), self.network.free_parameters))
130			return checkpoint
131
132			def add_iter_callback(self, func):
133			"""
134			Add a iteration callback function (receives an argument of the trainer).
135			:return:
136			"""
137			self._iter_callbacks.append(func)
138
139			def train(self, train_set, valid_set=None, test_set=None, train_size=None):
140			"""
141			Train the model and return costs.
142			"""
143			epoch = 0
144			while True:
145			# Test
146			if not epoch % self.config.test_frequency and test_set:
147			try:
148			self._run_test(epoch, test_set)
149			except KeyboardInterrupt:
150			logging.info('interrupted!')
151			break
152			# Validate
153			if not epoch % self.validation_frequency and valid_set:
154			try:
155
156			if not self._run_valid(epoch, valid_set):
157			logging.info('patience elapsed, bailing out')
158			break
159			except KeyboardInterrupt:
160			logging.info('interrupted!')
161			break
162			# Train one step
163			try:
164			costs = self._run_train(epoch, train_set, train_size)
165			except KeyboardInterrupt:
166			logging.info('interrupted!')
167			break
168			# Check costs
169			if np.isnan(costs[0][1]):
170			logging.info("NaN detected in costs, rollback to last parameters")
171			self.set_params(*self.checkpoint)
172			else:
173			epoch += 1
174			self.network.epoch_callback()
175
176			yield dict(costs)
177
178			if valid_set and self.config.get("save_best_parameters", True):
179			self.set_params(*self.best_params)
180			if test_set:
181			self._run_test(-1, test_set)
182
183			@abstractmethod
184			def learn(self, *variables):
185			"""
186			Update the parameters and return the cost with given data points.
187			:param variables:
188			:return:
189			"""
190
191			def _run_test(self, iteration, test_set):
192			"""
193			Run on test iteration.
194			"""
195			costs = self.test_step(test_set)
196			info = ' '.join('%s=%.2f' % el for el in costs)
197			message = "test (epoch=%i) %s" % (iteration + 1, info)
198			logging.info(message)
199			self.network.train_logger.record(message)
200			self.last_run_costs = costs
201
202			def _run_train(self, iteration, train_set, train_size=None):
203			"""
204			Run one training iteration.
205			"""
206			costs = self.train_step(train_set, train_size)
207			if not iteration % self.config.monitor_frequency:
208			info = " ".join("%s=%.2f" % item for item in costs)
209			message = "monitor (epoch=%i) %s" % (iteration + 1, info)
210			logging.info(message)
211			self.network.train_logger.record(message)
212			self.last_run_costs = costs
213			return costs
214
215			def _run_valid(self, iteration, valid_set, dry_run=False):
216			"""
217			Run one valid iteration, return true if to continue training.
218			"""
219			costs = self.valid_step(valid_set)
220			# this is the same as: (J_i - J_f) / J_i > min improvement
221			_, J = costs[0]
222			marker = ""
223			if self.best_cost - J > self.best_cost * self.min_improvement:
224			# save the best cost and parameters
225			self.best_params = self.copy_params()
226			marker = ' *'
227			if not dry_run:
228			self.best_cost = J
229			self.best_iter = iteration
230
231			if self.config.auto_save:
232			self.network.train_logger.record_progress(self._progress)
233			self.network.save_params(self.config.auto_save, new_thread=True)
234
235			info = ' '.join('%s=%.2f' % el for el in costs)
236			epoch = "epoch=%d" % (iteration + 1)
237			if dry_run:
238			epoch = "dryrun" + " " * (len(epoch) - 6)
239			message = "valid (%s) %s%s" % (epoch, info, marker)
240			logging.info(message)
241			self.last_run_costs = costs
242			self.network.train_logger.record(message)
243			self.checkpoint = self.copy_params()
244			return iteration - self.best_iter < self.patience
245
246			def test_step(self, test_set):
247			self._compile_evaluation_func()
248			costs = list(zip(
249			self.evaluation_names,
250			np.mean([self.evaluation_func(*x) for x in test_set], axis=0)))
251			return costs
252
253			def valid_step(self, valid_set):
254			self._compile_evaluation_func()
255			costs = list(zip(
256			self.evaluation_names,
257			np.mean([self.evaluation_func(*x) for x in valid_set], axis=0)))
258			return costs
259
260			def train_step(self, train_set, train_size=None):
261			dirty_trick_times = 0
262			network_callback = bool(self.network.training_callbacks)
263			trainer_callback = bool(self._iter_callbacks)
264			cost_matrix = []
265			self._progress = 0
266
267			for x in train_set:
268			if self._skip_batches == 0:
269
270			if dirty_trick_times > 0:
271			cost_x = self.learn(*[t[:(t.shape[0]/2)] for t in x])
272			cost_matrix.append(cost_x)
273			cost_x = self.learn(*[t[(t.shape[0]/2):] for t in x])
274			dirty_trick_times -= 1
275			else:
276			try:
277			cost_x = self.learn(*x)
278			except MemoryError:
279			logging.info("Memory error was detected, perform dirty trick 30 times")
280			dirty_trick_times = 30
281			# Dirty trick
282			cost_x = self.learn(*[t[:(t.shape[0]/2)] for t in x])
283			cost_matrix.append(cost_x)
284			cost_x = self.learn(*[t[(t.shape[0]/2):] for t in x])
285			cost_matrix.append(cost_x)
286			self.last_cost = cost_x[0]
287			if network_callback:
288			self.network.training_callback()
289			if trainer_callback:
290			for func in self._iter_callbacks:
291			func(self)
292			else:
293			self._skip_batches -= 1
294			if train_size:
295			self._progress += 1
296			sys.stdout.write("\x1b[2K\r> %d%% \| J=%.2f" % (self._progress * 100 / train_size, self.last_cost))
297			sys.stdout.flush()
298			self._progress = 0
299
300			if train_size:
301			sys.stdout.write("\r")
302			sys.stdout.flush()
303			costs = list(zip(self.training_names, np.mean(cost_matrix, axis=0)))
304			return costs
305
306			def run(self, train_set, valid_set=None, test_set=None, train_size=None, controllers=None):
307			"""
308			Run until the end.
309			"""
310			if isinstance(train_set, Dataset):
311			dataset = train_set
312			train_set = dataset.train_set()
313			valid_set = dataset.valid_set()
314			test_set = dataset.test_set()
315			train_size = dataset.train_size()
316			if controllers:
317			for controller in controllers:
318			controller.bind(self)
319			timer = Timer()
320			for _ in self.train(train_set, valid_set=valid_set, test_set=test_set, train_size=train_size):
321			if controllers:
322			ending = False
323			for controller in controllers:
324			if hasattr(controller, 'invoke') and controller.invoke():
325			ending = True
326			if ending:
327			break
328			if self._report_time:
329			timer.report()
330

zomux / deepy

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NeuralTrainer.run() F

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