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RootMeanSquaredError metric is missing from keras core.metrics

RootMeanSquaredError metric is missing from keras core.metrics: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm porting a regression model from tf.keras to keras core and one of the metrics I use during training is RMSE. With tf.keras this is just:

The task

I'm porting a regression model from `tf.keras` to `keras_core` and one of the metrics I use during training is RMSE. With `tf.keras` this is just:

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.