Tensorflow 中的默认变量初始值设定项是什么？

Question

当调用 tf.get_variable() 时没有任何初始化程序指定，默认使用的变量初始化方法是什么？文档只是说 'None'.

Answer 1

From the documentation:

If initializer is None (the default), the default initializer passed in the variable scope will be used. If that one is None too, a glorot_uniform_initializer will be used.

glorot_uniform_initializer 函数初始化均匀分布的值。

此函数documented为：

The Glorot uniform initializer, also called Xavier uniform initializer.

It draws samples from a uniform distribution within [-limit, limit],
where limit is sqrt(6 / (fan_in + fan_out))
where fan_in is the number of input units in the weight tensor
and fan_out is the number of output units in the weight tensor.

Reference: http://jmlr.org/proceedings/papers/v9/glorot10a/glorot10a.pdf