node-nlp/test/math/mathops.test.js

Library for NLU (Natural Language Understanding) done in Node.js

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const { Mathops } = require('../../lib');

describe('Mathops', () => {
  describe('Sigmoid', () => {
    test('Should return the sigmoid of a number', () => {
      const result = Mathops.sigmoid(0);
      expect(result).toEqual(0.5);
    });
    test('If the sigmoid is too high, never reach 1', () => {
      const result = Mathops.sigmoid(100);
      expect(result).toEqual(0.99999999999999);
    });
    test('If the sigmoid is too low, never reach 0', () => {
      const result = Mathops.sigmoid(-1000);
      expect(result).toEqual(1e-14);
    });
  });
});