def __sub__(self, other):
        if not isinstance(other, ConditionalFreqDist):
            return NotImplemented
        result = ConditionalFreqDist()
        for cond in self.conditions():
            newfreqdist = self[cond] - other[cond]
            if newfreqdist:
                result[cond] = newfreqdist
        for cond in other.conditions():
            if cond not in self.conditions():
                for elem, count in other[cond].items():
                    if count < 0:
                        result[cond][elem] = 0 - count
        return result
Report the minimum version of CUDA required by CULA.
dataset/ETHPy150Open nltk/nltk/nltk/probability.py/ConditionalFreqDist.__sub__--crossover with--dataset/ETHPy150Open lebedov/scikit-cuda/skcuda/cula.py/culaGetCudaMinimumVersion