code: def size_bytes(self) -> int:
      raise NotImplementedError()
  
imports: from abc import ABC, abstractmethod
  from typing import List, Tuple
  import dask.dataframe
  import pandas
  from ludwig.api_annotations import DeveloperAPI
  from ludwig.utils.audio_utils import is_audio_score
  from ludwig.utils.automl.utils import avg_num_tokens
  from ludwig.utils.image_utils import is_image_score
  from ludwig.utils.misc_utils import memoized_method
  from ludwig.utils.types import DataFrame
label_desc: Use image node_id 7 for calling the DataSource obj's underlying member method code with example usage: obj.size_bytes() without return types