code: def mean(x):
      return x.sum() / x.size
  
file_path: imageio/tests/test_swf.py
imports: import numpy
  import pytest
  import imageio.v2
  import imageio.plugins
  from imageio import core
  from imageio.core import IS_PYPY
  from conftest import deprecated_test
label_desc: Use image node_id 1 for calling a global function with example usage: mean(x) and returns: unknown