code: def cos_win(n):
      phase = (np.arange(n) + 0.5) * (math.pi / n)
      return np.sin(phase).astype(np.float32)
  
imports: from nvidia.dali.pipeline import Pipeline
  import nvidia.dali.ops
  import nvidia.dali.types
  import nvidia.dali
  import numpy
  from functools import partial
  from test_utils import get_files
  from test_utils import compare_pipelines
  from test_utils import RandomDataIterator
  from test_utils import ConstantDataIterator
  import librosa
  import math
label_desc: Use image node_id 2 for calling a global function with example usage: cos_win(n) and returns: np