How to calculate the KPI(RMSE) for a Hackathon when label is missing in the test data. I have created the model but i am not sure how to test it as it is a prediction problem and test doesnt have label

How to calculate the KPI(RMSE) for a Hackathon when label is missing in the test data. I have created the model but i am not sure how to test it as it is a prediction problem and test data doesnt have label.

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