code: def x():
      return np.zeros((10, 3, 28, 28), dtype=np.float32)
  
file_path: chainer/tests/onnx_chainer_tests/test_export_testcase.py
imports: import os
  import chainer
  import chainer.functions
  import chainer.links
  import numpy
  import onnx
  import pytest
  from onnx_chainer import export_testcase
  from onnx_chainer import export
label_desc: Use image node_id 2 for calling a global function with example usage: x() and returns: np