使用fasttext预训练的单词向量作为在tensorflow脚本中的嵌入

Question

我可以使用像这里的快速文字向量:https: //github.com/facebookresearch/fastText/blob/master/pretrained-vectors.md 在tensorflow脚本中作为嵌入向量而不是word2vec或手套而不使用库fasttext

Answer 1

当您使用预先训练的单词向量时,您可以使用gensim libarary.

供你参考. https://blog.manash.me/how-to-use-pre-trained-word-vectors-from-facebooks-fasttext-a71e6d55f27

In [1]: from gensim.models import KeyedVectors

In [2]: jp_model = KeyedVectors.load_word2vec_format('wiki.ja.vec')

In [3]: jp_model.most_similar('car')
Out[3]: 
[('cab', 0.9970724582672119),
 ('tle', 0.9969051480293274),
 ('oyc', 0.99671471118927),
 ('oyt', 0.996662974357605),
 ('?', 0.99665766954422),
 ('s', 0.9966464638710022),
 ('??', 0.9966358542442322),
 ('hice', 0.9966053366661072),
 ('otg', 0.9965877532958984),
 ('??', 0.9965814352035522)]

编辑

我创建了一个从cnn-text-classification-tf分叉的新分支.链接在这里. https://github.com/satojkovic/cnn-text-classification-tf/tree/use_fasttext

在这个分支中,使用fasttext有三个修改.

1. 从fasttext中提取词汇和word_vec.(util_fasttext.py)

model = KeyedVectors.load_word2vec_format('wiki.en.vec')
vocab = model.vocab
embeddings = np.array([model.word_vec(k) for k in vocab.keys()])

with open('fasttext_vocab_en.dat', 'wb') as fw:
    pickle.dump(vocab, fw, protocol=pickle.HIGHEST_PROTOCOL)
np.save('fasttext_embedding_en.npy', embeddings)

2. 嵌入图层

   W由零初始化,然后设置embedding_placeholder以接收word_vec,最后分配W.(text_cnn.py)

W_ = tf.Variable(
    tf.constant(0.0, shape=[vocab_size, embedding_size]),
    trainable=False,
    name='W')

self.embedding_placeholder = tf.placeholder(
    tf.float32, [vocab_size, embedding_size],
    name='pre_trained')

W = tf.assign(W_, self.embedding_placeholder)

3. 使用词汇和word_vec

   词汇用于构建word-id映射,word_vec被输入embedding_placeholder.

with open('fasttext_vocab_en.dat', 'rb') as fr:
    vocab = pickle.load(fr)
embedding = np.load('fasttext_embedding_en.npy')

pretrain = vocab_processor.fit(vocab.keys())
x = np.array(list(vocab_processor.transform(x_text)))

feed_dict = {
    cnn.input_x: x_batch,
    cnn.input_y: y_batch,
    cnn.dropout_keep_prob: FLAGS.dropout_keep_prob,
    cnn.embedding_placeholder: embedding
}

请试一试.