class_docstr: Remove field names if present.
  
  Parameters
  ----------
  field_names
      List of names of the fields that will be removed
code: def __init__(self, field_names: List[str]) -> None:
      self.field_names = field_names
  
imports: from collections import Counter
  from typing import Any, Dict, List
  from gluonts.core.component import validated
  from gluonts.dataset.common import DataEntry
  from ._base import MapTransformation, SimpleTransformation
label_desc: Use image node_id 1 to create a new RemoveFields object from inherited base classes: SimpleTransformation with example: obj = RemoveFields(field_names)