下面是使用 ImageDataGenerator 将输出保存到指定目录的示例,从而绕过使用 model.fit_generator 的要求。
from keras.preprocessing.image import ImageDataGenerator, array_to_img, img_to_array, load_img
datagen = ImageDataGenerator(
rotation_range=40,
width_shift_range=0.2,
height_shift_range=0.2,
shear_range=0.2,
zoom_range=0.2,
horizontal_flip=True,
fill_mode='nearest')
img = load_img('data/train/cats/cat.0.jpg') # this is a PIL image
x = img_to_array(img) # this is a Numpy array with shape (3, 150, 150)
x = x.reshape((1,) + x.shape) # this is a Numpy array with shape (1, 3, 150, 150)
# the .flow() command below generates batches of randomly transformed images
# and saves the results to the `preview/` directory
i = 0
for batch in datagen.flow(x, batch_size=1,
save_to_dir='preview', save_prefix='cat', save_format='jpeg'):
i += 1
if i > 20:
break # otherwise the generator would loop indefinitely
摘自这里:https://blog.keras.io/building-powerful-image-classification-models-using-very-little-data.html https://blog.keras.io/building-powerful-image-classification-models-using-very-little-data.html
您可以更改参数以适合您的用例,然后生成 X_train 和 X_valid 或任何数据集,然后加载到内存中并使用普通的旧 model.fit。