np.random.rand均匀分布随机数和np.random.randn正态分布随机数函数使用方法

np.random.rand(3,2)
           array([[ 0.14022471,  0.96360618],  #random
                  [ 0.37601032,  0.25528411],  #random
                  [ 0.49313049,  0.94909878]]) #random

>>> np.random.randn()
2.1923875335537315 #random

Two-by-four array of samples from N(3, 6.25):

>>> 2.5 * np.random.randn(2, 4) + 3
array([[-4.49401501,  4.00950034, -1.81814867,  7.29718677],  #random
       [ 0.39924804,  4.68456316,  4.99394529,  4.84057254]]) #random