keras/src/dtype_policies/dtype_policy_map.py/DTypePolicyMap/__repr__
class DTypePolicyMap:    def __repr__(self):
        default_policy = (
            self._default_policy.name
            if self._default_policy is not None
            else None
        )
        mapping = []
        for k, v in self._policy_map.items():
            mapping.append((k, v.name))
        return (
            f"<DTypePolicyMap at {hex(id(self))} "
            f"default_policy={default_policy}, "
            f"mapping={mapping}>"
        )