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Merge pull request #55 from carriepl/lstm_tutorial
Add basic LSTM tutorial
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import cPickle | ||
import gzip | ||
import os | ||
import sys | ||
import time | ||
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import numpy | ||
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import theano | ||
import theano.tensor as T | ||
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def prepare_data(seqs, labels, maxlen=None): | ||
# x: a list of sentences | ||
lengths = [len(s) for s in seqs] | ||
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if maxlen is not None: | ||
new_seqs = [] | ||
new_labels = [] | ||
new_lengths = [] | ||
for l, s, y in zip(lengths, seqs, labels): | ||
if l < maxlen: | ||
new_seqs.append(s) | ||
new_labels.append(y) | ||
new_lengths.append(l) | ||
lengths = new_lengths | ||
labels = new_labels | ||
seqs = new_seqs | ||
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if len(lengths) < 1: | ||
return None, None, None | ||
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n_samples = len(seqs) | ||
maxlen = numpy.max(lengths) | ||
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x = numpy.zeros((maxlen, n_samples)).astype('int64') | ||
x_mask = numpy.zeros((maxlen, n_samples)).astype('float32') | ||
for idx, s in enumerate(seqs): | ||
x[:lengths[idx], idx] = s | ||
x_mask[:lengths[idx], idx] = 1. | ||
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return x, x_mask, labels | ||
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def load_data(path="imdb.pkl", n_words=100000, valid_portion=0.1): | ||
''' Loads the dataset | ||
:type dataset: string | ||
:param dataset: the path to the dataset (here IMDB) | ||
''' | ||
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############# | ||
# LOAD DATA # | ||
############# | ||
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print '... loading data' | ||
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# Load the dataset | ||
f = open(path, 'rb') | ||
train_set = cPickle.load(f) | ||
test_set = cPickle.load(f) | ||
f.close() | ||
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# split training set into validation set | ||
train_set_x, train_set_y = train_set | ||
n_samples = len(train_set_x) | ||
sidx = numpy.random.permutation(n_samples) | ||
n_train = int(numpy.round(n_samples * (1. - valid_portion))) | ||
valid_set_x = [train_set_x[s] for s in sidx[n_train:]] | ||
valid_set_y = [train_set_y[s] for s in sidx[n_train:]] | ||
train_set_x = [train_set_x[s] for s in sidx[:n_train]] | ||
train_set_y = [train_set_y[s] for s in sidx[:n_train]] | ||
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train_set = (train_set_x, train_set_y) | ||
valid_set = (valid_set_x, valid_set_y) | ||
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def remove_unk(x): | ||
return [[1 if w >= n_words else w for w in sen] for sen in x] | ||
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test_set_x, test_set_y = test_set | ||
valid_set_x, valid_set_y = valid_set | ||
train_set_x, train_set_y = train_set | ||
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train_set_x = remove_unk(train_set_x) | ||
valid_set_x = remove_unk(valid_set_x) | ||
test_set_x = remove_unk(test_set_x) | ||
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train = (train_set_x, train_set_y) | ||
valid = (valid_set_x, valid_set_y) | ||
test = (test_set_x, test_set_y) | ||
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return train, valid, test |
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