code: def make_cost_matrix(profit_matrix, inversion_function):
      
      cost_matrix = []
      for row in profit_matrix:
          cost_matrix.append([inversion_function(value) for value in row])
      return cost_matrix
docs: Create a cost matrix from a profit matrix by calling
      'inversion_function' to invert each value. The inversion
      function must take one numeric argument (of any type) and return
      another numeric argument which is presumed to be the cost inverse
      of the original profit.
  
      This is a static method. Call it like this:
  
      .. python::
  
          cost_matrix = Munkres.make_cost_matrix(matrix, inversion_func)
  
      For example:
  
      .. python::
  
          cost_matrix = Munkres.make_cost_matrix(matrix, lambda x : sys.maxsize - x)
  
      :Parameters:
          profit_matrix : list of lists
              The matrix to convert from a profit to a cost matrix
  
          inversion_function : function
              The function to use to invert each entry in the profit matrix
  
      :rtype: list of lists
      :return: The converted matrix