code: def to_ts(self, data: DataEntry):
      return pd.Series(
          data["target"],
          index=pd.date_range(
              start=data["start"],
              periods=len(data["target"]),
              freq=data["start"].freq,
          ),
      )
  
file_path: gluonts/src/gluonts/nursery/robust-mts-attack/multivariate/datasets/grouper.py
imports: import logging
  import numpy
  import pandas
  from gluonts.dataset.common import ListDataset, DataEntry, Dataset
label_desc: Use image node_id 4 for calling the Grouper obj's underlying member method code with example usage: obj.to_ts(data) and returns: pd