Returns the child visit counts as a probability distribution, pi
        If squash is true, exponentiate the probabilities by a temperature
        slightly larger than unity to encourage diversity in early play and
        hopefully to move away from 3-3s

def children_as_pi(self, squash=False):
        """Returns the child visit counts as a probability distribution, pi
        If squash is true, exponentiate the probabilities by a temperature
        slightly larger than unity to encourage diversity in early play and
        hopefully to move away from 3-3s
        """
        probs = self.child_N
        if squash:
            probs = probs ** .98
        sum_probs = np.sum(probs)
        if sum_probs == 0:
            return probs
        return probs / np.sum(probs)