Correct type hint

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: AVHopp

notebooks/Transfer_Learning.py

@@ -324,7 +324,7 @@ def optimize_for_temperature(
         temp: str,
         tl_campaigns: dict[str, Campaign] = tl_campaigns,
         data: pd.DataFrame = data,
-        sample_fractions: list[int] = SAMPLE_FRACTIONS
+        sample_fractions: list[float] = SAMPLE_FRACTIONS
     ):
 
         lookup_T = data.copy(deep=True)