def __find_prime_in_row(self, row):
        """
        Find the first prime element in the specified row. Returns
        the column index, or -1 if no starred element was found.
        """
        col = -1
        for j in range(self.n):
            if self.marked[row][j] == 2:
                col = j
                break

        return col

        Find the first prime element in the specified row. Returns
        the column index, or -1 if no starred element was found.
        
ppdet/metrics/munkres.py