class_docstr: Base class for all Transformations.
  
  A Transformation processes works on a stream (iterator) of dictionaries.
class_docstr_tok: ["Base","class","for","all","Transformations",".","A","Transformation","processes","works","on","a","stream","(","iterator",")","of","dictionaries","."]
code: def chain(self, other: "Transformation") -> "Chain":
      return Chain([self, other])
  
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 2 for calling the Transformation obj's underlying member method code with example usage: obj.chain(other) and returns: Chain