It's an interesting finding. Could you elaborate a case that `__repr__` is
invoked before config collection?
On the other hand, your suggested change will make the caching useless, because
`ConfigSpace._collect` is always true. A more safer solution could be like:
```python
def _add_new_transform(self, space_class, name, axes, policy, **kwargs):
self._length = None
# do the rest process.
```
In this way, we "invalid" any existing length when a new knob is added.
Another solution is maintaining the length on the fly:
```python
def __init__(self):
self._length = 1
def _add_new_transform(self, space_class, name, axes, policy, **kwargs):
# do the rest process.
self._length *= len(self._entity_map[name])
def __len__(self):
return self._length
```
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