Okay, I see the data imbalance is a key factor here. I'm not sure if RMSE is the right choice, since that's more for regression tasks. I'm leaning towards F1 score or a weighted F-score to handle the imbalance.
I believe Key, Value, and TimeStamp are included because they are essential for identifying and storing data in HBase. Key Type is not necessary for the KeyValue format.
Tom
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