class_docstr: univariate mixture distribution
  
  for simple case for now (unbound support)
  does not yet inherit from scipy.stats.distributions
  
  adding pdf to mixture_rvs, some restrictions on broadcasting
  Currently it does not hold any state, all arguments included in each method.
code: def rvs(self, prob, size, dist, kwargs=None):
      return mixture_rvs(prob, size, dist, kwargs=kwargs)
  
file_path: statsmodels/statsmodels/distributions/mixture_rvs.py
imports: import numpy
label_desc: Use image node_id 1 for calling the MixtureDistribution obj's underlying member method code with example usage: obj.rvs(prob, size, dist, kwargs) and returns: mixture_rvs