code: def feat_name(i: int) -> str:
      """
      The canonical name of a feature with index `i`.
      """
      return f"feat_dynamic_real_{i:03d}"
  
imports: from typing import Callable, Dict, Iterator, List, NamedTuple, Optional
  import numpy
  import pandas
  import toolz
  from gluonts.core.component import validated
  from gluonts.dataset.common import DataEntry, Dataset
  from gluonts.model.forecast import SampleForecast
  from gluonts.model.predictor import RepresentablePredictor
label_desc: Use image node_id 1 for calling a global function with example usage: feat_name(i) and returns: str, i