ValueError: `steps_per_epoch=None` is only valid for a generator based on the `keras.utils.Sequence`

keras 自己写了个generator，然后继承的keras.utils.Sequence，但是在fit_generator()的时候，会报如下错误：

ValueError: `steps_per_epoch=None` is only valid for a generator based on the `keras.utils.Sequence`

就会很懵逼，明明继承了sequence类，然后

isinstance(your_generator,keras.utils.Sequence)

也显示true。

结果查了下，是因为代码块有的地方是直接import keras，而有的地方是import tensorflow.keras。这里的import需要保证统一。

感谢：https://github.com/keras-team/keras/issues/10855

For me it turned out that I used tensorflow import (import tensorflow.keras.utils.Sequence as sequence) for the sequence generator, but for the model I was training I used the keras import (from keras.layers import..... and from keras.models import....etc.)
changing to tensorflow.keras.layers, tensorflow.keras.models....etc worked for me.

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