helpers.py

import numpy as np
def load_image(img_file, target_size=(224,224)):
    X = np.zeros((1, *target_size, 3))
    X[0, ] = np.asarray(tf.keras.preprocessing.image.load_img(
        img_file, 
        target_size=target_size)
    )
    X = tf.keras.applications.mobilenet.preprocess_input(X)
    return X

import os
def ensure_folder_exists(folder):
    if not os.path.exists(folder):
        os.makedirs(folder)