allow features flags on bnb

bitsandbytes/__init__.py

@@ -20,12 +20,7 @@
 from .cextension import lib
 from .nn import modules
 
-# NOTE: this is a temporary flag to allow outside libraries to employ conditional logic while the refactor is still in
-# alpha/beta: sth like `if getattr(bitsandbytes, "is_multi_backend_refactor_preview", False): do sth`
-# the getattr() call above would default to False and any string evaluates to True. This way we have temporary thing
-# that we can remove in Transformers with the next release after the official BNB multi-platform release; then
-# eventually making it the new default (e.g. just remove if statement and dedent in Transformers)
-is_multi_backend_refactor_preview = "TO BE REMOVED ONCE MERGED TO `main`"  # bool evals to True for str
+features = {"multi_backend"}
 
 # Always register the CPU backend.
 register_backend("cpu", CPUBackend())