code: def deepvariant_testdata(filename):
      """Gets the path to filename in genomics/deepvariant/testdata.
  
      These paths are only known at runtime, after flag parsing
      has occurred.
  
      Args:
        filename: The name of a testdata file in the core genomics testdata
          directory. For example, if you have a test file in
          "learning/genomics/deepvariant/testdata/foo.txt", filename should be
          "foo.txt" to get a path to it.
  
      Returns:
        The absolute path to a testdata file.
      """
      return nucleus_test_utils.genomics_testdata(
          os.path.join("deepvariant/testdata", filename),
          DEEPVARIANT_DATADIR,
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: deepvariant_testdata(filename) and returns: nucleus_test_utils