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[FEA] Speed up nvForest for shallow trees using Hummingbird algorithm #69

@hcho3

Description

@hcho3

nvForest has many advantages over the legacy FIL (cuML older than 25.08) but it is not as fast for models with shallow trees.

TODOs

  • Perform "speed of light" analysis
  • Verify the feasibility of the Hummingbird algorithm in Python (cuPy + nvmath-python)
  • Implement Hummingbird in FIL C++

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