wifi-location/dsc.py

#!/usr/bin/env python3

# Sorensen-Dice coefficient: $\frac{2|X \cap Y|}{|X| + |Y|}

match_wifi_num_crit = 1

def dsc(known_pt, new_pt):
    a = known_pt.wifi_snr
    b = new_pt.wifi_snr
    up = 0
    for mac in a:
        if mac in b:
            up += 1
    if up < match_wifi_num_crit:
        return None
    return 2 * up / (len(a) + len(b))

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