This allows users to pass wildcard/multi-expressions for features: e.g. pl.col("^x.*$") to automatically capture any column starting with "x". This will also now work properly in .group_by / .over contexts
handles empty data corner case for multi-target regression
This allows users to pass wildcard/multi-expressions for features: e.g.
pl.col("^x.*$")
to automatically capture any column starting with "x". This will also now work properly in.group_by
/.over
contexts