resolve_max_depth

Description:

public abstract int resolve_max_depth (int64 elements, int threads)

Calculates the proper max depth.

elements	an estimate of the number of elements. it is negative if infinite or unknown.
threads	the number of threads (always >= 1)

max depth. 0: no split, 1: one split, 2: two split, ... (a split may generate one or more child nodes). unlimited if negative