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A regression task that the y value’s range is around a * 10^-5 to b * 10^-4 and trying to use XGBoost to handle this question.

And the weird thing is, when finished model training, the model predictions on test data are always the same value.

I suspected that the y range is too small, so I do a data preprocessing to multiply 1000 to every y value and after that, the model’s prediction back to normal. It can predict different output for test data, what’s going on here?

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