code: def mixture_source(task):
      if task not in _MIXTURE_FILES:
          raise NotImplementedError(f"Unexpected task: {task}")
      path = torchaudio.utils.download_asset(
          f"test-assets/{_MIXTURE_FILES[task]}"
      )
      return path
  
file_path: audio/test/integration_tests/conftest.py
imports: import os
  import shutil
  import pytest
  import torch
  import torchaudio
label_desc: Use image node_id 3 for calling a global function with example usage: mixture_source(task) and returns: path