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ValueError: Could not interpret optimizer identifier: <keras.optimizers.optimizer_v2.adam.Adam object at 0x7fbe77391a00>

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**Describe the bug(问题描述)** get a valueError when running deepfm demo **To Reproduce(复现步骤)** ```python # fail and get ValueError: Could not interpret optimizer identifier: model.compile(optimizer=tf.keras.optimizers.Adam(learning_rate=learning_rate), loss="binary_crossentropy", metrics=['accuracy','binary_crossentropy', tf.keras.metrics.AUC(curve='ROC')]) # success model.compile("adam",...