| # TODO: refactor nested_dict into common library with ATen | |
| class nested_dict(object): | |
| def __init__(self, base, parent): | |
| self.base, self.parent = base, parent | |
| def __contains__(self, item): | |
| return item in self.base or item in self.parent | |
| def __getitem__(self, x): | |
| r = self.base.get(x) | |
| if r is not None: | |
| return r | |
| return self.parent[x] |