code: def echo(delay=0):
      def inner_echo(x, **kwargs):
          import time
  
          if delay:
              time.sleep(delay)
          return x
  
      return inner_echo
  
imports: import sys
  import numpy
  import ipyparallel
label_desc: Use image node_id 1 for calling a global function with example usage: echo(delay) and returns: inner_echo, x