wifi-location/otsuka.py

# $K = \frac{|A \cap B|}{\sqrt{|A| \times |B|}}$
def otsuka_sim(known_point, new_point):
    from math import sqrt
    up, d1, d2 = 0.0, 0.0, 0.0
    a, b = known_point, new_point
    for key in a.wifi_snr:
        d1 += 1
        if key in b.wifi_snr:
            up += 1
    for key in b.wifi_snr:
        d2 += 1
    if up == 0:
        return None
    else:
        return up / sqrt(d1) / sqrt(d2)

if __name__ == '__main__':
    from wifiloc import toplev
    toplev(infile = "basicdata.csv", sim = otsuka_sim, bad_wifi_crit = 5000,
            sim_crit = 0.0)