/
treedata_iterator.py
150 lines (121 loc) · 5.17 KB
/
treedata_iterator.py
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import numpy
import shuffle
import cPickle as pkl
import gzip
def fopen(filename, mode='r'):
if filename.endswith('.gz'):
return gzip.open(filename, mode)
return open(filename, mode)
class TreeTextIterator:
"""Simple Bitext iterator."""
def __init__(self, source, target,
source_dict, target_dict, sourcetree,
batch_size=128,
maxlen=100,
n_words_source=-1,
n_words_target=-1,
shuffle_each_epoch=False):
if shuffle_each_epoch:
shuffle.main([source, target, sourcetree])
self.source = fopen(source+'.shuf', 'r')
self.target = fopen(target+'.shuf', 'r')
self.source_tree = fopen(sourcetree+'.shuf', 'r')
else:
self.source = fopen(source, 'r')
self.target = fopen(target, 'r')
self.source_tree = fopen(sourcetree, 'r')
with open(source_dict, 'rb') as f:
self.source_dict = pkl.load(f)
with open(target_dict, 'rb') as f:
self.target_dict = pkl.load(f)
self.shuffle = shuffle_each_epoch
self.batch_size = batch_size
self.maxlen = maxlen
self.n_words_source = n_words_source
self.n_words_target = n_words_target
self.source_buffer = []
self.source_tree_buffer = []
self.target_buffer = []
self.k = batch_size * 20
self.end_of_data = False
def __iter__(self):
return self
def reset(self):
if self.shuffle:
shuffle.main([self.source.name.replace('.shuf', ''), self.target.name.replace('.shuf', ''), self.source_tree.name.replace('.shuf', '')])
self.source = fopen(self.source.name, 'r')
self.target = fopen(self.target.name, 'r')
self.source_tree = fopen(self.source_tree.name, 'r')
else:
self.source.seek(0)
self.target.seek(0)
self.source_tree.seek(0)
def next(self):
if self.end_of_data:
self.end_of_data = False
self.reset()
raise StopIteration
source = []
source_tree = []
target = []
# fill buffer, if it's empty
assert len(self.source_buffer) == len(self.target_buffer), 'Buffer size mismatch!'
if len(self.source_buffer) == 0:
for k_ in xrange(self.k): # batch_size * 20 buffer
ss = self.source.readline()
ss_tree = self.source_tree.readline()
if ss == "":
break
tt = self.target.readline()
if tt == "":
break
self.source_buffer.append(ss.strip().split()) # split by space
self.source_tree_buffer.append(ss_tree.strip().split())
self.target_buffer.append(tt.strip().split())
# sort by target buffer
tlen = numpy.array([len(t) for t in self.target_buffer])
tidx = tlen.argsort() # e.g. array([1,3,2,8,4]) => array([0, 2, 1, 4, 3])
_sbuf = [self.source_buffer[i] for i in tidx]
_s_treebuf = [self.source_tree_buffer[i] for i in tidx]
_tbuf = [self.target_buffer[i] for i in tidx]
self.source_buffer = _sbuf
self.source_tree_buffer = _s_treebuf
self.target_buffer = _tbuf
if len(self.source_buffer) == 0 or len(self.target_buffer) == 0:
self.end_of_data = False
self.reset()
raise StopIteration
try:
# actual work here
while True:
# read from source file and map to word index worddict['eos'] = 0 worddict['UNK'] = 1
try:
ss = self.source_buffer.pop()
ss_tree = self.source_tree_buffer.pop()
except IndexError:
break
ss = [self.source_dict[w] if w in self.source_dict else 1
for w in ss]
if self.n_words_source > 0:
ss = [w if w < self.n_words_source else 1 for w in ss]
# read from target file and map to word index
tt = self.target_buffer.pop()
tt = [self.target_dict[w] if w in self.target_dict else 1
for w in tt]
if self.n_words_target > 0:
tt = [w if w < self.n_words_target else 1 for w in tt]
if len(ss) > self.maxlen and len(tt) > self.maxlen:
continue
source.append(ss)
source_tree.append(ss_tree)
target.append(tt)
if len(source) >= self.batch_size or \
len(target) >= self.batch_size:
break
except IOError:
self.end_of_data = True
if len(source) <= 0 or len(target) <= 0:
self.end_of_data = False
self.reset()
raise StopIteration
return source, target, source_tree