class_docstr: Base class for decoder neural module to be used in NLP models. 
code: def embedding(self) -> Optional[Any]:
      raise NotImplementedError
  
file_path: NeMo/nemo/collections/nlp/modules/common/decoder_module.py
imports: from abc import ABC
  from typing import Any, Dict, Optional
  from nemo.core.classes import NeuralModule
  from nemo.core.neural_types import ChannelType, EncodedRepresentation, MaskType, NeuralType
label_desc: Use image node_id 5 for calling the DecoderModule obj's underlying member method code with example usage: obj.embedding() without return types