code: def source_file_run_tag_filter(run, index):
      """Create a RunTagFilter for listing source files.
  
      Args:
        run: tfdbg2 run name.
        index: The index for the source file of which the content is to be
          accessed.
  
      Returns:
        `RunTagFilter` for accessing the content of the source file.
      """
      return provider.RunTagFilter(
          runs=[run],
          tags=["%s_%d" % (SOURCE_FILE_BLOB_TAG_PREFIX, index)],
      )
  
imports: import json
  from tensorboard.data import provider
  from tensorboard.plugins.debugger_v2 import debug_data_multiplexer
label_desc: Use image node_id 17 for calling a global function with example usage: source_file_run_tag_filter(run, index) and returns: provider