class_docstr: The actual mutator pass to extract the constants from a function and replace them with
  Vars so the function can be lowered to a TE graph. Additionally returns all the values of
  the constants extracted.
code: def __init__(self):
      super().__init__()
      self.constants = []
      self.const_vars = []
  
imports: import tvm
  from tvm import relay
  from tvm.driver.build_module import schedule_to_module
  from tvm.relay.backend.contrib.ethosu import vela_api
  from tvm.relay.expr_functor import ExprMutator
  from ..None import util
  from .None import passes
  from .scheduler import schedule
label_desc: Use image node_id 1 to create a new ExtractConstants object from inherited base classes: ExprMutator with example: obj = ExtractConstants()