我正在尝试构建一个最简单的 LSTM 网络。只是想让它预测序列中的下一个值np_input_data
.
import tensorflow as tf
from tensorflow.python.ops import rnn_cell
import numpy as np
num_steps = 3
num_units = 1
np_input_data = [np.array([[1.],[2.]]), np.array([[2.],[3.]]), np.array([[3.],[4.]])]
batch_size = 2
graph = tf.Graph()
with graph.as_default():
tf_inputs = [tf.placeholder(tf.float32, [batch_size, 1]) for _ in range(num_steps)]
lstm = rnn_cell.BasicLSTMCell(num_units)
initial_state = state = tf.zeros([batch_size, lstm.state_size])
loss = 0
for i in range(num_steps-1):
output, state = lstm(tf_inputs[i], state)
loss += tf.reduce_mean(tf.square(output - tf_inputs[i+1]))
with tf.Session(graph=graph) as session:
tf.initialize_all_variables().run()
feed_dict={tf_inputs[i]: np_input_data[i] for i in range(len(np_input_data))}
loss = session.run(loss, feed_dict=feed_dict)
print(loss)
解释器返回:
ValueError: Variable BasicLSTMCell/Linear/Matrix already exists, disallowed. Did you mean to set reuse=True in VarScope? Originally defined at:
output, state = lstm(tf_inputs[i], state)
我做错了什么?
致电给lstm
here:
for i in range(num_steps-1):
output, state = lstm(tf_inputs[i], state)
除非您另有说明,否则每次迭代都会尝试创建具有相同名称的变量。您可以使用以下方法执行此操作tf.variable_scope
with tf.variable_scope("myrnn") as scope:
for i in range(num_steps-1):
if i > 0:
scope.reuse_variables()
output, state = lstm(tf_inputs[i], state)
第一次迭代创建代表 LSTM 参数的变量,以及每次后续迭代(在调用reuse_variables
)只会在范围内按名称查找它们。
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