code: def rvs(self, size=1):
      return np.random.multivariate_normal(
          self.mean, self.cov, size=size
      )
  
imports: import numpy
  from scipy import special
  from statsmodels.sandbox.distributions.multivariate import mvstdtprob
  from .extras import mvnormcdf
label_desc: Use image node_id 2 for calling the BivariateNormal obj's underlying member method code with example usage: obj.rvs(size) and returns: np