class_docstr: Base class for factors representing various multivariate
  representations.
code: def variable(self):
      return self.scope()[0]
  
imports: import types
  import numpy
  import scipy.integrate
  from pgmpy.factors.base import BaseFactor
  from pgmpy.factors.distributions import GaussianDistribution, CustomDistribution
label_desc: Use image node_id 3 for calling the ContinuousFactor obj's underlying member method code with example usage: obj.variable() and returns: self