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tensorflow的variable scope和name scope
阅读量:271 次
发布时间:2019-03-01

本文共 1512 字,大约阅读时间需要 5 分钟。

在TensorFlow中,变量共享机制通过variable_scopename_scope实现,无需传递引用即可在不同代码块共享变量。这种机制的核心在于tf.get_variable函数,它允许在不同的代码块中创建或检索变量。值得注意的是,tf.get_variabletf.Variable存在显著区别:后者会在每次创建时生成新的变量,并在名称中自动添加后缀以区分不同的实例。

在使用tf.get_variable创建变量或检索现有变量时,name_scope会被忽略。这意味着即使在不同的tf.variable_scope中创建变量,它们的命名空间仍会根据variable_scope的设置进行调整。以下代码示例展示了这一点:

import tensorflow as tfwith tf.name_scope('test_scope'):    test1 = tf.get_variable('test1', [1], dtype=tf.float32)    test2 = tf.Variable(1, name='test2', dtype=tf.float32)    a = tf.add(test1, test2)    print(test1.name)  # test_scope/test1:0    print(test2.name)  # test_scope/test2:0    print(a.name)      # test_scope/Add:0

然而,如果希望通过tf.get_variable创建的变量能够在其他代码块中被访问,需要使用tf.variable_scope。这样可以确保变量在不同代码块中共享:

import tensorflow as tfwith tf.variable_scope('test_scope'):    test1 = tf.get_variable('test1', [1], dtype=tf.float32)    test2 = tf.Variable(1, name='test2', dtype=tf.float32)    a = tf.add(test1, test2)    print(test1.name)  # test_scope/test1:0    print(test2.name)  # test_scope/test2:0    print(a.name)      # test_scope/Add:0

此外,tf.variable_scope还支持reuse参数。当reuse=True时,变量会在同一个scope中被多次使用,而name_scope则会被忽略:

import tensorflow as tfwith tf.variable_scope('share'):    share = tf.get_variable('share_variable', [1])with tf.variable_scope('share', reuse=True):    share_test = tf.get_variable('share_variable', [1])    print(share.name)        # share/share_variable:0    print(share_test.name)   # share/share_variable:0

通过上述方法,可以有效地在TensorFlow中管理变量的共享和命名,确保变量在不同代码块中能够被正确访问和使用。

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