You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: tabular_decision_node.m
    path of file: ./repos/bnt/BNT/CPDs/@tabular_decision_node
    
    the code of the file until where you have to start completion: function CPD = tabular_decision_node(bnet, self, CPT)
% TABULAR_DECISION_NODE Represent a stochastic policy over a discrete decision/action node as a table
% CPD = tabular_decision_node(bnet, self, CPT)

    
function CPD = tabular_decision_node(bnet, self, CPT)
% TABULAR_DECISION_NODE Represent a stochastic policy over a discrete decision/action node as a table
% CPD = tabular_decision_node(bnet, self, CPT)
%
% node is the number of a node in this equivalence class.
% CPT is an optional argument (see tabular_CPD for details); by default, it is the uniform policy.

if nargin==0
  % This occurs if we are trying to load an object from a file.
  CPD = init_fields;
  CPD = class(CPD, 'tabular_decision_node', discrete_CPD(1, []));
  return;
elseif isa(bnet, 'tabular_decision_node')
  % This might occur if we are copying an object.
  CPD = bnet;
  return;
end