code: def setup_solver(*args, **kwargs):
      """create a WaveSolver in the engine namespace."""
      global solver
      solver = WaveSolver(*args, **kwargs)
  
imports: import argparse
  import time
  from numpy import sqrt
  import ipyparallel
label_desc: Use image node_id 2 for calling a global function with example usage: setup_solver() without return types