code: def initialize_root(self, x):
      self.varname_generator = make_varname_generator()
      self.varname = next(self.varname_generator)
      print("{} = {}".format(self.varname, x))
  
file_path: autograd/examples/print_trace.py
imports: from __future__ import print_function
  import autograd.numpy
  from autograd.tracer import trace, Node
  from autograd import grad
label_desc: Use image node_id 2 for calling the PrintNode obj's underlying member method code with example usage: obj.initialize_root(x) without return types