code: def forward(self, inputs, mask=None):
      raise NotImplementedError
  
file_path: ludwig/ludwig/decoders/base.py
imports: from abc import ABC, abstractmethod
  from ludwig.api_annotations import DeveloperAPI
  from ludwig.utils.torch_utils import LudwigModule
label_desc: Use image node_id 1 for calling the Decoder obj's underlying member method code with example usage: obj.forward(inputs, mask) without return types