Break ties in each row of a tensor according to the specified policy

        Args:
            Y_s: An [n, k] np.ndarray of probabilities
            break_ties: A tie-breaking policy:
                "abstain": return an abstain vote (0)
                "random": randomly choose among the tied options
                    NOTE: if break_ties="random", repeated runs may have
                    slightly different results due to difference in broken ties
                [int]: ties will be broken by using this label

def _break_ties(self, Y_s, break_ties="random"):
        """Break ties in each row of a tensor according to the specified policy

        Args:
            Y_s: An [n, k] np.ndarray of probabilities
            break_ties: A tie-breaking policy:
                "abstain": return an abstain vote (0)
                "random": randomly choose among the tied options
                    NOTE: if break_ties="random", repeated runs may have
                    slightly different results due to difference in broken ties
                [int]: ties will be broken by using this label
        """
        n, k = Y_s.shape
        Y_h = np.zeros(n)
        diffs = np.abs(Y_s - Y_s.max(axis=1).reshape(-1, 1))

        TOL = 1e-5
        for i in range(n):
            max_idxs = np.where(diffs[i, :] < TOL)[0]
            if len(max_idxs) == 1:
                Y_h[i] = max_idxs[0] + 1
            # Deal with "tie votes" according to the specified policy
            elif break_ties == "random":
                Y_h[i] = np.random.choice(max_idxs) + 1
            elif break_ties == "abstain":
                Y_h[i] = 0
            elif isinstance(break_ties, int):
                Y_h[i] = break_ties
            else:
                ValueError(f"break_ties={break_ties} policy not recognized.")
        return Y_h