[7.7][ML] Feature importance performance optimization #1016
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This PR aims to improve the computation efficiency of the feature importance computation. To this end, it introduces continuous memory array to store elements from the split path, pre-reserved at the beginning. Furthermore, I split scale values away from fractionOnes, fractionZeros, and splitIndex to improve cache efficiency. Altogether, I could reduce the computation time by half. I will look into improving SHAP algorithms by introducing suitable heuristics in a follow-up PR.
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Backport to #1005