使用TensorFlow变换有效地将标记转换为字向量
在我的培训、验证和推理阶段,我想使用TensorFlow转换将标记转换为单词向量 我遵循这一点,实现了从标记到向量的初始转换。转换按预期工作,我为每个令牌获得使用TensorFlow变换有效地将标记转换为字向量,tensorflow,word2vec,apache-beam,tensorflow-transform,glove,Tensorflow,Word2vec,Apache Beam,Tensorflow Transform,Glove,在我的培训、验证和推理阶段,我想使用TensorFlow转换将标记转换为单词向量 我遵循这一点,实现了从标记到向量的初始转换。转换按预期工作,我为每个令牌获得EMB_DIM的向量 import numpy as np import tensorflow as tf tf.reset_default_graph() EMB_DIM = 10 def load_pretrained_glove(): tokens = ["a", "cat", "plays", "piano"]
EMB_DIM
的向量
import numpy as np
import tensorflow as tf
tf.reset_default_graph()
EMB_DIM = 10
def load_pretrained_glove():
tokens = ["a", "cat", "plays", "piano"]
return tokens, np.random.rand(len(tokens), EMB_DIM)
# sample string
string_tensor = tf.constant(["plays", "piano", "unknown_token", "another_unknown_token"])
pretrained_vocab, pretrained_embs = load_pretrained_glove()
vocab_lookup = tf.contrib.lookup.index_table_from_tensor(
mapping = tf.constant(pretrained_vocab),
default_value = len(pretrained_vocab))
string_tensor = vocab_lookup.lookup(string_tensor)
# define the word embedding
pretrained_embs = tf.get_variable(
name="embs_pretrained",
initializer=tf.constant_initializer(np.asarray(pretrained_embs), dtype=tf.float32),
shape=pretrained_embs.shape,
trainable=False)
unk_embedding = tf.get_variable(
name="unk_embedding",
shape=[1, EMB_DIM],
initializer=tf.random_uniform_initializer(-0.04, 0.04),
trainable=False)
embeddings = tf.cast(tf.concat([pretrained_embs, unk_embedding], axis=0), tf.float32)
word_vectors = tf.nn.embedding_lookup(embeddings, string_tensor)
with tf.Session() as sess:
tf.tables_initializer().run()
tf.global_variables_initializer().run()
print(sess.run(word_vectors))
当我重构代码以作为TFX转换图运行时,我在下面的ConversionError
中得到了错误
import pprint
import tempfile
import numpy as np
import tensorflow as tf
import tensorflow_transform as tft
import tensorflow_transform.beam.impl as beam_impl
from tensorflow_transform.tf_metadata import dataset_metadata
from tensorflow_transform.tf_metadata import dataset_schema
tf.reset_default_graph()
EMB_DIM = 10
def load_pretrained_glove():
tokens = ["a", "cat", "plays", "piano"]
return tokens, np.random.rand(len(tokens), EMB_DIM)
def embed_tensor(string_tensor, trainable=False):
"""
Convert List of strings into list of indices then into EMB_DIM vectors
"""
pretrained_vocab, pretrained_embs = load_pretrained_glove()
vocab_lookup = tf.contrib.lookup.index_table_from_tensor(
mapping=tf.constant(pretrained_vocab),
default_value=len(pretrained_vocab))
string_tensor = vocab_lookup.lookup(string_tensor)
pretrained_embs = tf.get_variable(
name="embs_pretrained",
initializer=tf.constant_initializer(np.asarray(pretrained_embs), dtype=tf.float32),
shape=pretrained_embs.shape,
trainable=trainable)
unk_embedding = tf.get_variable(
name="unk_embedding",
shape=[1, EMB_DIM],
initializer=tf.random_uniform_initializer(-0.04, 0.04),
trainable=False)
embeddings = tf.cast(tf.concat([pretrained_embs, unk_embedding], axis=0), tf.float32)
return tf.nn.embedding_lookup(embeddings, string_tensor)
def preprocessing_fn(inputs):
input_string = tf.string_split(inputs['sentence'], delimiter=" ")
return {'word_vectors': tft.apply_function(embed_tensor, input_string)}
raw_data = [{'sentence': 'This is a sample sentence'},]
raw_data_metadata = dataset_metadata.DatasetMetadata(dataset_schema.Schema({
'sentence': dataset_schema.ColumnSchema(
tf.string, [], dataset_schema.FixedColumnRepresentation())
}))
with beam_impl.Context(temp_dir=tempfile.mkdtemp()):
transformed_dataset, transform_fn = ( # pylint: disable=unused-variable
(raw_data, raw_data_metadata) | beam_impl.AnalyzeAndTransformDataset(
preprocessing_fn))
transformed_data, transformed_metadata = transformed_dataset # pylint: disable=unused-variable
pprint.pprint(transformed_data)
错误消息
TypeError: Failed to convert object of type <class
'tensorflow.python.framework.sparse_tensor.SparseTensor'> to Tensor.
Contents: SparseTensor(indices=Tensor("StringSplit:0", shape=(?, 2),
dtype=int64), values=Tensor("hash_table_Lookup:0", shape=(?,),
dtype=int64), dense_shape=Tensor("StringSplit:2", shape=(2,),
dtype=int64)). Consider casting elements to a supported type.
TypeError:无法将类型的对象转换为Tensor。
内容:SparseTensor(指数=张量(“StringSplit:0”,形状=(?,2),
dtype=int64),values=Tensor(“哈希表查找:0”,形状=(?,),
dtype=int64),density_shape=Tensor(“StringSplit:2”,shape=(2,),
dtype=int64)。将铸造元素考虑为支持类型。
问题
nx矢量内存N
和N
工人数量
与SparSetSensor相关的错误是因为您正在调用返回SparSetSensor的string_split。您的测试代码不调用string_split,这就是为什么它只发生在转换代码中
关于内存,您是正确的,嵌入矩阵必须加载到每个worker中。在您的情况下,不能将SparseTensor放入函数“preprocessing\u fn”返回的TFX转换所返回的字典中。原因是SparseTensor不是张量,它实际上是一个小的子图 要修复代码,可以将SparseTensor转换为张量。有很多方法可以做到这一点,我建议将tf.serialize_sparse用于常规SparseTensor,将tf.serialize_many_sparse用于批处理传感器
要在Trainer中使用这样的序列化张量,可以调用函数tf。反序列化\u many\u sparse.大家好!我们正在找人来看看这个问题。抱歉耽搁了