def __init__(self, p = 0.1, r = 10):
nbin_mpmath = lambda k, p, r: mpmath.gamma(k + r)/(mpmath.gamma(k+1)\
*mpmath.gamma(r))*np.power(1-p, r)*np.power(p, k)
self.nbin = np.frompyfunc(nbin_mpmath, 3, 1)
self.p = p
self.r = r
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