我使用DataGenerator：（https://www.tensorflow.org/api_docs/python/tf/keras/utils/Sequence）创建了一个自定义tf.keras.utils.Sequence。 这是自定义的DataGenerator：

# Here,`x_set` is list of path to the images
# and `y_set` are the associated classes.

class DataGenerator(Sequence):

    def __init__(self,x_set,y_set,batch_size):
        self.x,self.y = x_set,y_set
        self.batch_size = batch_size

    def __len__(self):
        return math.ceil(len(self.x) / self.batch_size)

    def __getitem__(self,idx):
        batch_x = self.x[idx * self.batch_size:(idx + 1) *
        self.batch_size]
        batch_x = np.array(batch_x)
        batch_x = batch_x*1/255
        batch_y = self.y[idx * self.batch_size:(idx + 1) *
        self.batch_size]

        return np.array([
            resize(imread(file_name),(64,128))
               for file_name in batch_x]),np.array(batch_y)

x_set是我的图像的路径列表，而y_set是相关的类。 我现在想添加一个函数来重新缩放图像的每个像素，方法是将其与rescale = 1./255类中的ImageDataGenerator相乘：https://keras.io/api/preprocessing/image/#ImageDataGenerator%20class

当我在model.fit_generator上应用此代码时：

model.fit_generator(generator=training_generator,validation_data=validation_generator,steps_per_epoch = num_train_samples // 128,validation_steps = num_val_samples // 128,epochs = 10)

我收到此错误：

---------------------------------------------------------------------------
UFuncTypeError                            Traceback (most recent call last)
<ipython-input-62-571a868b2d2a> in <module>()
      3                     steps_per_epoch = num_train_samples // 128,4                     validation_steps = num_val_samples // 128,----> 5                     epochs = 10)

8 frames
<ipython-input-54-d98c3b0c7c56> in __getitem__(self,idx)
     15         self.batch_size]
     16         batch_x = np.array(batch_x)
---> 17         batch_x = batch_x*1/255
     18         batch_y = self.y[idx * self.batch_size:(idx + 1) *
     19         self.batch_size]

UFuncTypeError: ufunc 'multiply' did not contain a loop with signature matching types (dtype('<U77'),dtype('<U77')) -> dtype('<U77')

如何修改我的代码？