tensorflow中用正太分布随机初始化网络权重参数 ---tf.random_normal
https://www.tensorflow.org/api_docs/python/tf/random_normal
numpy的random库也有normal函数，功能类似，参数排列次序不同：
https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.random.normal.html
https://www.tensorflow.org/api_docs/python/tf/random_normal
numpy的random库也有normal函数，功能类似，参数排列次序不同：
https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.random.normal.html
