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module 'tensorflow_core._api.v2.train' has no attribute 'Optimizer'

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Traceback (most recent call last): File "run_classifier.py", line 25, in import optimization File "D:\bertpro\bert\optimization.py", line 87, in class AdamWeightDecayOptimizer(tf.train.Optimizer): AttributeError: module 'tensorflow_core._api.v2.train' has no attribute 'Optimizer'