class_docstr: Base class for distribution.
  
  Parameters
  ----------
  event_dim : int, default None
      Variable indicating the dimension of the distribution's support.
  validate_args : bool, default None
      Whether to validate the distribution parameters
docstr: Returns the variance of the distribution.
docstr_tok: ["Returns","the","variance","of","the","distribution","."]
code: def variance(self):
      r"""
      Returns the variance of the distribution.
      """
      raise NotImplementedError
  
imports: from numbers import Number
  from .utils import cached_property
  from ....None import np
label_desc: Use image node_id 13 for calling the Distribution obj's underlying member method code with example usage: obj.variance() without return types