WIP start rationalizing positive and negative value indexing
ENH greatly simplify index machinery to indicate positive and negative
ENH better variable name
ENH faster binary search
ENH more descriptive variable nmae
ENH remove duplicated variable (current_col => Xf)
ENH get rid of tmp_indices
ENH make a function for nnz value extraction
ENH clean variables: unused/names
ENH more robust binary search to overflow
ENH simpler code path
ENH split faster data when the best split is found
ENH small improvements in testing
Cythonize _tree.pyx
ENH avoid recursive initilization of index_to_samples
Re-cythonize gbrt
ENH improve input checking
FIX api issues during tree fitting
ENH improve testing (assertions)
ENH simplify interface for prediction