code: def _cdf(self, x, c):
      return 1.0 - np.power(1 - c * x, 1.0 / c)
  
imports: import numpy
  from scipy import stats
  from scipy.special import comb
  from scipy.stats.distributions import rv_continuous
  import matplotlib.pyplot
  from numpy import where, inf
  from numpy import abs
label_desc: Use image node_id 4 for calling the genpareto2_gen obj's underlying member method code with example usage: obj._cdf(x, c) and returns: unknown