class_docstr: A pass that lowers NPU Relay functions to TIR. This pass wraps
  the _lower_to_tir pass that operates function->function, while this
  is IRModule->IRModule.
  
  Attributes
  ----------
  scheduler : callable
      A function to schedule NPU operations. For example,
      scheduler.py/copy_constants.
code: def __init__(self, scheduler):
      self.scheduler = scheduler
  
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 LowerToTIR object  with example: obj = LowerToTIR(scheduler)