張量升維技巧np.expand_dims(), np.reshape(),np.concatenate()

from keras.preprocessing import image   
import matplotlib.pyplot as plt
import cv2
import numpy as np

img_path = '/Parthenon.jpg'
im2 = image.load_img(img_path, target_size=(224, 224))
img = image.img_to_array(im2)

x = np.expand_dims(img, axis=0)
x1 = np.array(img).reshape((1, 224, 224, 3))
img2=np.copy(x1)
x2 = np.concatenate((img2,img2),axis=-1)
x2 = np.concatenate((img2,img2),axis=-1)