Method test_distance

test/test_vector.py:733–744

(self)

        print "pattern.vector.centroid()"
        
    def test_distance(self):
        # Assert distance metrics.
        v1 = vector.Vector({"cat":1})
        v2 = vector.Vector({"cat":0.5, "dog":1})
        for d, method in (
          (0.55, vector.COSINE),    # 1 - ((1*0.5 + 0*1) / (sqrt(1**2 + 0**2) * sqrt(0.5**2 + 1**2)))
          (1.25, vector.EUCLIDEAN), # (1-0.5)**2 + (0-1)**2
          (1.50, vector.MANHATTAN), # abs(1-0.5) + abs(0-1)
          (1.00, vector.HAMMING),   # (True + True) / 2
          (1.11, lambda v1, v2: 1.11)):
            self.assertAlmostEqual(vector.distance(v1, v2, method), d, places=2)
        print "pattern.vector.distance()"
        
    def test_distancemap(self):
        # Assert distance caching mechanism.