np.stack 和 np.concatenate两个函数都可用来连接数组
1,np.stack
import numpy as np
a = np.zeros(12).reshape(4,3,)
b = np.arange(12).reshape(4,3)
# for np.stack:all input arrays must have the same shape
print(np.hstack((a, b)).shape) # (4, 6)
print(np.vstack((a, b)).shape) # (8, 3)
print(np.dstack((a, b)).shape) # (4, 3, 2)
print(np.stack((a, b), axis=0).shape) # (2, 4, 3)
print(np.stack((a, b), axis=1).shape) # (4, 2, 3)
print(np.stack((a, b), axis=2).shape) # (4, 3, 2)
2,np.concatenate
a = np.zeros(12).reshape(2,3, 2)
b = np.arange(6).reshape(2,3, 1)
print(np.concatenate((a, b), axis=2).shape) # (2, 3, 3)
# print(np.stack((a, b), axis=2).shape) # error
print(np.dstack((a, b)).shape) # (2, 3, 3)