def __init__(self, ea):
        self._ea = ea

        results = self._calc_cases()

        self._map = self._build_map(results)

        self._reverse_map = self._build_reverse(self._map)
compute the l2 distance
dataset/ETHPy150Open tmr232/Sark/sark/code/switch.py/Switch.__init__--crossover with--dataset/ETHPy150Open bolme/pyvision/src/pyvision/other/distance.py/l2