oner_quantize

Function find_intervals

Source 
pub fn find_intervals<A, C>(
    attribute: &[A],
    classes: &[C],
    small: usize,
) -> Vec<Interval<A, C>>
where
    A: OrdSubset + Copy + Debug,
    C: Eq + Hash + Copy + Debug,
Expand description

Quantize the given attribute (aka feature, column) into an ordered list of Intervals.

§Arguments

  • attribute - a single attribute, typically numeric, to be quantized.
  • classes - the corresponsing class for each attribute value.
  • small - the small disjunct threshold, such as 3. There has to be at least one class in an interval with more than small values in the interval.

§Examples

use oner_quantize::find_intervals;
use oner_quantize::Interval;
use oner_quantize::Interval::{Lower, Range, Upper};

// Fake data that has three clear splits:
let attribute = vec![  1, 10,   3,   1,  20,  30,  100];
let classes   = vec!["a", "b", "a", "a", "b", "b", "c"];

let intervals =
   find_intervals(&attribute, &classes, 2);

assert_eq!(intervals, vec![
  Lower { below: 10, class: "a" },
  Range { from: 10, below: 100, class: "b" },
  Upper { from: 100, class: "c" }
]);