code: def _flattern(effects):
      if not effects:
          return effects
      if isinstance(effects[0], str):
          return effects
      return [item for sublist in effects for item in sublist]
  
file_path: audio/test/torchaudio_unittest/common_utils/sox_utils.py
imports: import subprocess
  import sys
  import warnings
label_desc: Use image node_id 5 for calling a global function with example usage: _flattern(effects) and returns: unknown, effects, effects