Enum TreeMethod

pub enum TreeMethod {
    Auto,
    Exact,
    Approx,
    Hist,
    GpuExact,
    GpuHist,
}

The tree construction algorithm used in XGBoost (see description in the reference paper).

Distributed and external memory version only support approximate algorithm.

Variants

Auto

Use heuristic to choose faster one.

• For small to medium dataset, exact greedy will be used.
• For very large-dataset, approximate algorithm will be chosen.
• Because old behavior is always use exact greedy in single machine, user will get a message when approximate algorithm is chosen to notify this choice.

Exact

Exact greedy algorithm.

Approx

Approximate greedy algorithm using sketching and histogram.

Hist

Fast histogram optimized approximate greedy algorithm. It uses some performance improvements such as bins caching.

GpuExact

GPU implementation of exact algorithm.

GpuHist

GPU implementation of hist algorithm.

Trait Implementations

impl Clone for TreeMethod

fn clone(&self) -> TreeMethod

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for TreeMethod

fn default() -> Self

Returns the “default value” for a type.

impl ToString for TreeMethod

fn to_string(&self) -> String

Converts the given value to a String.