## Classes [`class LossScaleOptimizer`](https://www.tensorflow.org/versions/r2.15/api_docs/python/tf/keras/mixed_precision/LossScaleOptimizer): An optimizer that applies loss scaling to prevent numeric underflow. [`class Policy`](https://www.tensorflow.org/versions/r2.15/api_docs/python/tf/keras/mixed_precision/Policy): A dtype policy for a Keras layer. ## Functions [`global_policy(...)`](https://www.tensorflow.org/versions/r2.15/api_docs/python/tf/keras/mixed_precision/global_policy): Returns the global dtype policy. [`set_global_policy(...)`](https://www.tensorflow.org/versions/r2.15/api_docs/python/tf/keras/mixed_precision/set_global_policy): Sets the global dtype policy.