class_docstr: Calculate the Munkres solution to the classical assignment problem.
  See the module documentation for usage.
docstr: Return an exact copy of the supplied matrix
docstr_tok: ["Return","an","exact","copy","of","the","supplied","matrix"]
code: def __copy_matrix(self, matrix):
      """Return an exact copy of the supplied matrix"""
      return copy.deepcopy(matrix)
  
imports: import sys
label_desc: Use image node_id 5 for calling the Munkres obj's underlying member method code with example usage: obj.__copy_matrix(matrix) and returns: copy