在VarScope中设置reuse=True或reuse=tf.AUTO_REUSE是什么意思?

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各位,我正在尝试这个

loss = tf.reduce_mean(tf.square(outputs - y)) # MSE
optimizer = tf.train.AdamOptimizer(learning_rate=learning_rate)
train = optimizer.minimize(loss)

但我得到一个错误

Variable rnn/output_projection_wrapper/basic_lstm_cell/kernel/Adam/ already exists, disallowed. Did you mean to set reuse=True or reuse=tf.AUTO_REUSE in VarScope?