code: def _get_block_metadata(
      self,
      paths: List[str],
      schema: Optional[Union[type, "pyarrow.lib.Schema"]],
      *,
      rows_per_file: Optional[int],
      file_sizes: List[Optional[int]],
  ) -> BlockMetadata:
      metadata = super()._get_block_metadata(
          paths,
          schema,
          rows_per_file=rows_per_file,
          file_sizes=file_sizes,
      )
      if metadata.size_bytes is not None:
          metadata.size_bytes = int(
              metadata.size_bytes * self._encoding_ratio
          )
      return metadata
  
imports: import io
  import logging
  import time
  from typing import TYPE_CHECKING, Iterator, List, Optional, Tuple, Union
  import numpy
  from ray.data._internal.delegating_block_builder import DelegatingBlockBuilder
  from ray.data._internal.util import _check_import
  from ray.data.block import Block, BlockMetadata
  from ray.data.datasource.file_based_datasource import FileBasedDatasource
  from ray.data.datasource.file_meta_provider import DefaultFileMetadataProvider
  from ray.util.annotations import DeveloperAPI
label_desc: Use image node_id 2 for calling the _ImageFileMetadataProvider obj's underlying member method code with example usage: obj._get_block_metadata(paths, schema) and returns: metadata