我正在尝试keras以下keras文档页面中的示例代码,
https://keras.io/applications/
什么preprocess_input(x)功能keras在下面的代码所做的模块？为什么expand_dims(x, axis=0)在传递给preprocess_input()方法之前我们必须做什么？
from keras.applications.resnet50 import ResNet50
from keras.preprocessing import image
from keras.applications.resnet50 import preprocess_input
import numpy as np
model = ResNet50(weights='imagenet')
img_path = 'elephant.jpg'
img = image.load_img(img_path, target_size=(224, 224))
x = image.img_to_array(img)
x = np.expand_dims(x, axis=0)
x = preprocess_input(x)
有没有对这些功能有很好解释的文档？
谢谢!