随机分布 + action 计数

For random samples from , use:  注意平方：

sigma * np.random.randn(...) + mu

2.5*2.5 = 6.25

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

actionCount = []
for i in range(0, 10):
    actionCount.append(0)
actionCount[action] +=1