code: def get_image_values(self, column: str, sample_size: int = 10) -> int:
      return int(
          sum(
              is_image_score(x)
              for x in self.sample[column].head(sample_size)
          )
      )
  
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 5 for calling the DaskDataSource obj's underlying member method code with example usage: obj.get_image_values(column, sample_size) and returns: int