code: def func(x):
      return x * x
  
file_path: ipyparallel/ipyparallel/tests/test_dependency.py
imports: import ipyparallel
  from ipyparallel.serialize import can, uncan
  from ipyparallel.util import interactive
  from .clienttest import ClusterTestCase, raises_remote
label_desc: Use image node_id 2 for calling a global function with example usage: func(x) and returns: unknown