code: def img_decoder_pipe(device, out_type, files):
      encoded, _ = fn.readers.file(files=files)
      decoded = fn.decoders.image(
          encoded, device=device, output_type=out_type
      )
      return decoded
  
imports: import glob
  import math
  import numpy
  import nvidia.dali.backend
  import nvidia.dali.fn
  import nvidia.dali.types
  import os
  import random
  from nvidia.dali import pipeline_def
  from nose2.tools import params
  from nose_utils import assert_raises
  from test_utils import check_output_pattern
  from test_utils import compare_pipelines
  from test_utils import get_dali_extra_path
  from test_utils import to_array
label_desc: Use image node_id 15 for calling a global function with example usage: img_decoder_pipe(device, out_type, files) and returns: decoded