python – Tensorflow:为什么必须在声明变量后声明`saver = tf.train.Saver()`?
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![python – Tensorflow:为什么必须在声明变量后声明`saver = tf.train.Saver()`?](/upload/InfoBanner/zyjiaocheng/728/f0102dc2988e4ade941f92ae1e16a1e5.jpg)
重要说明:我只在笔记本环境中运行此部分,图形定义.我还没有参加过实际的会议.
运行此代码时:
with graph.as_default(): #took out " , tf.device('/cpu:0')"
saver = tf.train.Saver()
valid_examples = np.array(random.sample(range(1, valid_window), valid_size)) #put inside graph to get new words each time
train_dataset = tf.placeholder(tf.int32, shape=[batch_size, cbow_window*2 ])
train_labels = tf.placeholder(tf.int32, shape=[batch_size, 1])
valid_dataset = tf.constant(valid_examples, dtype=tf.int32)
valid_datasetSM = tf.constant(valid_examples, dtype=tf.int32)
embeddings = tf.get_variable( 'embeddings',
initializer= tf.random_uniform([vocabulary_size, embedding_size], -1.0, 1.0))
softmax_weights = tf.get_variable( 'softmax_weights',
initializer= tf.truncated_normal([vocabulary_size, embedding_size],
stddev=1.0 / math.sqrt(embedding_size)))
softmax_biases = tf.get_variable('softmax_biases',
initializer= tf.zeros([vocabulary_size]), trainable=False )
embed = tf.nn.embedding_lookup(embeddings, train_dataset) #train data set is
embed_reshaped = tf.reshape( embed, [batch_size*cbow_window*2, embedding_size] )
segments= np.arange(batch_size).repeat(cbow_window*2)
averaged_embeds = tf.segment_mean(embed_reshaped, segments, name=None)
#return tf.reduce_mean( tf.nn.sampled_softmax_loss(weights=softmax_weights, biases=softmax_biases, inputs=averaged_embeds,
#labels=train_labels, num_sampled=num_sampled, num_classes=vocabulary_size))
loss = tf.reduce_mean(
tf.nn.sampled_softmax_loss(weights=softmax_weights, biases=softmax_biases, inputs=averaged_embeds,
labels=train_labels, num_sampled=num_sampled, num_classes=vocabulary_size))
norm = tf.sqrt(tf.reduce_sum(tf.square(embeddings), 1, keepdims=True))
normSM = tf.sqrt(tf.reduce_sum(tf.square(softmax_weights), 1, keepdims=True))
normalized_embeddings = embeddings / norm
normalized_embeddingsSM = softmax_weights / normSM
valid_embeddings = tf.nn.embedding_lookup(
normalized_embeddings, valid_dataset)
valid_embeddingsSM = tf.nn.embedding_lookup(
normalized_embeddingsSM, valid_datasetSM)
similarity = tf.matmul(valid_embeddings, tf.transpose(normalized_embeddings))
similaritySM = tf.matmul(valid_embeddingsSM, tf.transpose(normalized_embeddingsSM))
我收到了这个错误
ValueError:没有要保存的变量
同时指着这条线
saver = tf.train.Saver()
我搜索了堆栈溢出并找到了这个答案
Tensorflow ValueError: No variables to save from
所以我只是简单地将该行放在图形定义的底部
with graph.as_default(): #took out " , tf.device('/cpu:0')"
valid_examples = np.array(random.sample(range(1, valid_window), valid_size)) #put inside graph to get new words each time
train_dataset = tf.placeholder(tf.int32, shape=[batch_size, cbow_window*2 ])
train_labels = tf.placeholder(tf.int32, shape=[batch_size, 1])
valid_dataset = tf.constant(valid_examples, dtype=tf.int32)
valid_datasetSM = tf.constant(valid_examples, dtype=tf.int32)
embeddings = tf.get_variable( 'embeddings',
initializer= tf.random_uniform([vocabulary_size, embedding_size], -1.0, 1.0))
softmax_weights = tf.get_variable( 'softmax_weights',
initializer= tf.truncated_normal([vocabulary_size, embedding_size],
stddev=1.0 / math.sqrt(embedding_size)))
softmax_biases = tf.get_variable('softmax_biases',
initializer= tf.zeros([vocabulary_size]), trainable=False )
embed = tf.nn.embedding_lookup(embeddings, train_dataset) #train data set is
embed_reshaped = tf.reshape( embed, [batch_size*cbow_window*2, embedding_size] )
segments= np.arange(batch_size).repeat(cbow_window*2)
averaged_embeds = tf.segment_mean(embed_reshaped, segments, name=None)
loss = tf.reduce_mean(
tf.nn.sampled_softmax_loss(weights=softmax_weights, biases=softmax_biases, inputs=averaged_embeds,
labels=train_labels, num_sampled=num_sampled, num_classes=vocabulary_size))
norm = tf.sqrt(tf.reduce_sum(tf.square(embeddings), 1, keepdims=True))
normSM = tf.sqrt(tf.reduce_sum(tf.square(softmax_weights), 1, keepdims=True))
normalized_embeddings = embeddings / norm
normalized_embeddingsSM = softmax_weights / normSM
valid_embeddings = tf.nn.embedding_lookup(
normalized_embeddings, valid_dataset)
valid_embeddingsSM = tf.nn.embedding_lookup(
normalized_embeddingsSM, valid_datasetSM)
similarity = tf.matmul(valid_embeddings, tf.transpose(normalized_embeddings))
similaritySM = tf.matmul(valid_embeddingsSM, tf.transpose(normalized_embeddingsSM))
saver = tf.train.Saver()
然后没有错误!
为什么会这样?图形定义仅定义图形,而不是运行任何图形.也许这是一个防止错误的措施?
解决方法:
它不必. tf.train.Saver有一个defer_build参数,如果设置为True,则允许您在构造变量后定义它们.然后,您需要显式调用build.
saver = tf.train.Saver(defer_build=True)
# construct your graph, create variables...
...
saver.build()
graph.finalize()
# go on with training
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