precision

Description

Given an Observable of ground-truth labels and predictions, the precision operator returns the precision.

API

precision([initialState={truePositives: 0, falsePositives: 0}])

Since

0.5

Parameters

None

Options

• initialState: Object {truePositives: Number, falsePositives: Number}: Sets a warm start value so that the calculation can continue from a non-zero starting point (instead of a blank state). The initialState should have these keys:

  • truePositives: Number is a count of the true positives

  • falsePositives: Number is a count of the false positives

Returns

Number. (The current precision of the Observable.)

Examples

import { from } from 'rxjs';
import { precision } from '@buccaneer/rxjs-stats';

const items = [
  [0, 1], // [trueLabel, prediction]
  [0, 1],
  [0, 1],
  [0, 0],
  [0, 0],
  [1, 1],
  [1, 1],
  [1, 1],
  [1, 1],
  [1, 0],
];

const precision$ = from(items).pipe(
  precision()
);

precision$.subscribe(console.log);
// Output
// 0
// 0
// 0
// 0
// 0
// 0.25
// 0.40
// 0.50
// 0.5714285714
// 0.5714285714