class_docstr: Transformations that yield zero or more results per input, but do not
  combine elements from the input stream.
class_docstr_tok: ["Transformations","that","yield","zero","or","more","results","per","input",",","but","do","not","combine","elements","from","the","input","stream","."]
code: def flatmap_transform(
      self, data: DataEntry, is_train: bool
  ) -> Iterator[DataEntry]:
      pass
  
imports: import abc
  from dataclasses import dataclass
  from typing import Callable, Iterable, Iterator, List
  from gluonts.core.component import equals, validated
  from gluonts.dataset.common import DataEntry, Dataset
  from gluonts.env import env
label_desc: Use image node_id 3 for calling the FlatMapTransformation obj's underlying member method code with example usage: obj.flatmap_transform(data, is_train) without return types