class_docstr: Initialize an instance of UAI reader class
  
  Parameters
  ----------
  path : file or str
      Path of the file containing UAI information.
  
  string : str
      String containing UAI information.
  
  Examples
  --------
  >>> from pgmpy.readwrite import UAIReader
  >>> reader = UAIReader('TestUai.uai')
  >>> model = reader.get_model()
  
  Reference
  ---------
  [1] https://uaicompetition.github.io/uci-2022/file-formats/model-format/
  [2] https://forgemia.inra.fr/thomas.schiex/toulbar2/-/blob/master/doc/UAI08Format.txt
docstr: Returns a list of variables.
  Each variable is represented by an index of list.
  For example if the no of variables are 4 then the list will be
  [var_0, var_1, var_2, var_3]
  
  Returns
  -------
  list: list of variables
  
  Examples
  --------
  >>> from pgmpy.readwrite import UAIReader
  >>> reader = UAIReader('TestUAI.uai')
  >>> reader.get_variables()
  ['var_0', 'var_1', 'var_2']
docstr_tok: ["Returns","a","list","of","variables",".","Each","variable","is","represented","by","an","index","of","list",".","For","example","if","the","no","of","variables","are","4","then","the","list","will","be","[","var_0",",","var_1",",","var_2",",","var_3","]","Returns","--","--","--","-","list",":","list","of","variables","Examples","--","--","--","--",">",">",">","from","pgmpy.readwrite","import","UAIReader",">",">",">","reader","=","UAIReader","(","'TestUAI.uai","'",")",">",">",">","reader.get_variables","(",")","[","'var_0","'",",","'var_1","'",",","'var_2","'","]"]
code: def get_variables(self):
      """
      Returns a list of variables.
      Each variable is represented by an index of list.
      For example if the no of variables are 4 then the list will be
      [var_0, var_1, var_2, var_3]
  
      Returns
      -------
      list: list of variables
  
      Examples
      --------
      >>> from pgmpy.readwrite import UAIReader
      >>> reader = UAIReader('TestUAI.uai')
      >>> reader.get_variables()
      ['var_0', 'var_1', 'var_2']
      """
      variables = []
      for var in range(0, self.no_variables):
          var_name = "var_" + str(var)
          variables.append(var_name)
      return variables
  
imports: from itertools import combinations
  import numpy
  from pyparsing import Combine, Literal, Optional, Regex, Word, alphas, nums
  from pgmpy.factors.discrete import DiscreteFactor, TabularCPD
  from pgmpy.models import BayesianNetwork, MarkovNetwork
  from pgmpy.utils import compat_fns
label_desc: Use image node_id 4 for calling the UAIReader obj's underlying member method code with example usage: obj.get_variables() and returns: variables