code: def daily_df():
      df = DataLoader().load_peyton_manning()
      df[TIME_COL] = pd.to_datetime(df[TIME_COL])
      return df
  
file_path: greykite/greykite/tests/algo/common/test_holiday_grouper.py
imports: import pandas
  import pytest
  from greykite.algo.common.holiday_grouper import HolidayGrouper
  from greykite.algo.common.holiday_utils import HOLIDAY_NAME_COL
  from greykite.algo.common.holiday_utils import get_weekday_weekend_suffix
  from greykite.common.constants import EVENT_DF_DATE_COL
  from greykite.common.constants import EVENT_DF_LABEL_COL
  from greykite.common.constants import TIME_COL
  from greykite.common.constants import VALUE_COL
  from greykite.common.data_loader import DataLoader
  from greykite.common.features.timeseries_features import get_holidays
  from greykite.common.python_utils import assert_equal
label_desc: Use image node_id 1 for calling a global function with example usage: daily_df() and returns: df