ValueError: Weights for model sequential have not yet been created. Weights are created when the Mod

hi 各位巨大佬，之前用tf2，直接用继承model的方法创建的model很容易出现这个bug，不知道哪里有鬼，而参数我已经在init进行了初始化，按道理说不应该啊。卧槽，这是啥原因呢？

 gradients = tape.gradient(loss, model.trainable_variables)/data/prod/anaconda3/envs/xulm1/lib/python3.8/site-packages/tensorflow/python/keras/engine/base_layer.py:1972 trainable_variablesreturn self.trainable_weights/data/prod/anaconda3/envs/xulm1/lib/python3.8/site-packages/tensorflow/python/keras/engine/network.py:569 trainable_weightstrackable_layer_utils.gather_trainable_weights(/data/prod/anaconda3/envs/xulm1/lib/python3.8/site-packages/tensorflow/python/training/tracking/layer_utils.py:271 gather_trainable_weightsweights += layer.trainable_weights/data/prod/anaconda3/envs/xulm1/lib/python3.8/site-packages/tensorflow/python/keras/engine/network.py:569 trainable_weightstrackable_layer_utils.gather_trainable_weights(/data/prod/

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