There is a small bug in `ConfigSpace` where if `__repr__` is invoked before the
config has finished collecting knobs / spaces, subsequently collected items
will not count towards the size of the whole config space which will result in
an incomplete run of autotuning.
This is due to the caching
@comaniac in my case it happened when I was logging the config at the top of a
compute / schedule function, before all knobs were defined, which is sometimes
useful given the dual collect / apply behavior of config.
Good solution btw, a lot better than my suggestion.
> `ConfigSpace._collect`
