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CatBoost solves the problem of bias in pointwise gradient estimates

If I understood correctly the pointwise gradient estimate is the empirical gradient given a point. And the bias come from the estimate is being heavily data dependent. I didn't read the full paper, ...
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How does XGBoost perform in Parallel

Xgboost does not run multiple trees in parallel like you noted. You need predictions after each tree to update gradients. Rather, it does the parallelization WITHIN a single tree my using openMP to ...
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