code: def listFiles():
      allFiles = []
      for root, dirs, files in os.walk("highlevel/svm"):
          for f in files:
              allFiles.append(os.path.join(root, f))
  
      return [f for f in allFiles if f.endswith(".sig")]
  
file_path: essentia/test/src/unittests/highlevel/test_gaiatransform.py
imports: from essentia_test import *
  import os, os.path
  import yaml
label_desc: Use image node_id 2 for calling a global function with example usage: listFiles() and returns: unknown