Did you use the code for a supervised application? i.e., did you pass both an `X...

Did you use the code for a supervised application? i.e., did you pass both an `X` and a `y` to the selector? If so, then getting less than 1 just means you can't get a perfect fit to `y` with your features. Please let me know if that's not it.

If interested, you can find some detailed examples in a tutorial below https://github.com/EFavDB/linselect_demos