import numpy as np

a = np.random.randn(5)
print(a)         #[-0.55459233 -0.75563203  1.51804116  0.50456651  0.99163455]
print(a.shape)   #(5,)

b = np.random.randn(1,5)
print(b)        # [[-2.89767054 -1.3113141  -0.06264208 -1.06174974  0.74401589]]
print(b.shape)  (1, 5)
