new pandas index uses to_numpy(), not get_values()

quantopian#379 (comment)

Author: shlomiku

alphalens/tears.py

@@ -429,7 +429,7 @@ def create_turnover_tear_sheet(factor_data, turnover_periods=None):
     if turnover_periods is None:
         input_periods = utils.get_forward_returns_columns(
             factor_data.columns, require_exact_day_multiple=True,
-        ).get_values()
+        ).to_numpy()
         turnover_periods = utils.timedelta_strings_to_integers(input_periods)
     else:
         turnover_periods = utils.timedelta_strings_to_integers(