class_docstr: Base class for all other splitter.
code: def split(
      self, dataset: Dataset
  ) -> Tuple["TrainingDataset", "TestTemplate"]:
      return (
          TrainingDataset(dataset=dataset, splitter=self),
          TestTemplate(dataset=dataset, splitter=self),
      )
  
imports: from abc import ABC, abstractmethod
  from dataclasses import dataclass
  from typing import Generator, Optional, Tuple
  import pandas
  from gluonts.dataset import Dataset, DataEntry
  from gluonts.dataset.field_names import FieldName
label_desc: Use image node_id 3 for calling the AbstractBaseSplitter obj's underlying member method code with example usage: obj.split(dataset) and returns: TrainingDataset,  TestTemplate