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import logging
import random
import numpy
import cPickle
from picklable_itertools import iter_
from fuel.datasets import Dataset
from fuel.streams import DataStream
from fuel.schemes import IterationScheme, ConstantScheme
from fuel.transformers import Batch, Mapping, SortMapping, Unpack, Padding, Transformer
import sys
import os
logging.basicConfig(level='INFO')
logger = logging.getLogger(__name__)
class QADataset(Dataset):
def __init__(self, path, vocab_file, n_entities, need_sep_token, **kwargs):
self.provides_sources = ('context', 'question', 'answer', 'candidates')
self.path = path
self.vocab = ['@entity%d' % i for i in range(n_entities)] + \
[w.rstrip('\n') for w in open(vocab_file)] + \
['<UNK>', '@placeholder'] + \
(['<SEP>'] if need_sep_token else [])
self.n_entities = n_entities
self.vocab_size = len(self.vocab)
self.reverse_vocab = {w: i for i, w in enumerate(self.vocab)}
super(QADataset, self).__init__(**kwargs)
def to_word_id(self, w, cand_mapping):
if w in cand_mapping:
return cand_mapping[w]
elif w[:7] == '@entity':
raise ValueError("Unmapped entity token: %s"%w)
elif w in self.reverse_vocab:
return self.reverse_vocab[w]
else:
return self.reverse_vocab['<UNK>']
def to_word_ids(self, s, cand_mapping):
return numpy.array([self.to_word_id(x, cand_mapping) for x in s.split(' ')], dtype=numpy.int32)
def get_data(self, state=None, request=None):
if request is None or state is not None:
raise ValueError("Expected a request (name of a question file) and no state.")
lines = [l.rstrip('\n') for l in open(os.path.join(self.path, request))]
ctx = lines[2]
q = lines[4]
a = lines[6]
cand = [s.split(':')[0] for s in lines[8:]]
entities = range(self.n_entities)
while len(cand) > len(entities):
logger.warning("Too many entities (%d) for question: %s, using duplicate entity identifiers"
%(len(cand), request))
entities = entities + entities
random.shuffle(entities)
cand_mapping = {t: k for t, k in zip(cand, entities)}
ctx = self.to_word_ids(ctx, cand_mapping)
q = self.to_word_ids(q, cand_mapping)
cand = numpy.array([self.to_word_id(x, cand_mapping) for x in cand], dtype=numpy.int32)
a = numpy.int32(self.to_word_id(a, cand_mapping))
if not a < self.n_entities:
raise ValueError("Invalid answer token %d"%a)
if not numpy.all(cand < self.n_entities):
raise ValueError("Invalid candidate in list %s"%repr(cand))
if not numpy.all(ctx < self.vocab_size):
raise ValueError("Context word id out of bounds: %d"%int(ctx.max()))
if not numpy.all(ctx >= 0):
raise ValueError("Context word id negative: %d"%int(ctx.min()))
if not numpy.all(q < self.vocab_size):
raise ValueError("Question word id out of bounds: %d"%int(q.max()))
if not numpy.all(q >= 0):
raise ValueError("Question word id negative: %d"%int(q.min()))
return (ctx, q, a, cand)
class QAIterator(IterationScheme):
requests_examples = True
def __init__(self, path, shuffle=False, **kwargs):
self.path = path
self.shuffle = shuffle
super(QAIterator, self).__init__(**kwargs)
def get_request_iterator(self):
l = [f for f in os.listdir(self.path)
if os.path.isfile(os.path.join(self.path, f))]
if self.shuffle:
random.shuffle(l)
return iter_(l)
# -------------- DATASTREAM SETUP --------------------
class ConcatCtxAndQuestion(Transformer):
produces_examples = True
def __init__(self, stream, concat_question_before, separator_token=None, **kwargs):
assert stream.sources == ('context', 'question', 'answer', 'candidates')
self.sources = ('question', 'answer', 'candidates')
self.sep = numpy.array([separator_token] if separator_token is not None else [],
dtype=numpy.int32)
self.concat_question_before = concat_question_before
super(ConcatCtxAndQuestion, self).__init__(stream, **kwargs)
def get_data(self, request=None):
if request is not None:
raise ValueError('Unsupported: request')
ctx, q, a, cand = next(self.child_epoch_iterator)
if self.concat_question_before:
return (numpy.concatenate([q, self.sep, ctx]), a, cand)
else:
return (numpy.concatenate([ctx, self.sep, q]), a, cand)
class _balanced_batch_helper(object):
def __init__(self, key):
self.key = key
def __call__(self, data):
return data[self.key].shape[0]
def setup_datastream(path, vocab_file, config):
ds = QADataset(path, vocab_file, config.n_entities, need_sep_token=config.concat_ctx_and_question)
it = QAIterator(path, shuffle=config.shuffle_questions)
stream = DataStream(ds, iteration_scheme=it)
if config.concat_ctx_and_question:
stream = ConcatCtxAndQuestion(stream, config.concat_question_before, ds.reverse_vocab['<SEP>'])
# Sort sets of multiple batches to make batches of similar sizes
stream = Batch(stream, iteration_scheme=ConstantScheme(config.batch_size * config.sort_batch_count))
comparison = _balanced_batch_helper(stream.sources.index('question' if config.concat_ctx_and_question else 'context'))
stream = Mapping(stream, SortMapping(comparison))
stream = Unpack(stream)
stream = Batch(stream, iteration_scheme=ConstantScheme(config.batch_size))
stream = Padding(stream, mask_sources=['context', 'question', 'candidates'], mask_dtype='int32')
return ds, stream
if __name__ == "__main__":
# Test
class DummyConfig:
def __init__(self):
self.shuffle_entities = True
self.shuffle_questions = False
self.concat_ctx_and_question = False
self.concat_question_before = False
self.batch_size = 2
self.sort_batch_count = 1000
ds, stream = setup_datastream(os.path.join(os.getenv("DATAPATH"), "deepmind-qa/cnn/questions/training"),
os.path.join(os.getenv("DATAPATH"), "deepmind-qa/cnn/stats/training/vocab.txt"),
DummyConfig())
it = stream.get_epoch_iterator()
for i, d in enumerate(stream.get_epoch_iterator()):
print '--'
print d
if i > 2: break
# vim: set sts=4 ts=4 sw=4 tw=0 et :
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