code: def handle_index(self, layers):
      num_layers = self.end_index - self.start_index + 1
      if ":" in layers:
          start_index, end_index = layers.split(":")
          start_index = int(start_index) if start_index else 0
          end_index = int(end_index) if end_index else num_layers - 1
      else:
          start_index = int(layers)
          end_index = start_index + 1
      if start_index < 0:
          start_index += num_layers
      if end_index < 0:
          end_index += num_layers
      start_index += self.start_index
      end_index += self.start_index
      start_index = max(
          self.start_index, min(self.end_index - 1, start_index)
      )
      end_index = max(
          self.start_index + 1, min(self.end_index, end_index)
      )
  
      for i in range(self.net_num):
          start_index = start_index - self.net_op_nums[i]
          if start_index < 0:
              self.start_net_idx = i
              self.start_op_idx = start_index + self.net_op_nums[i]
              break
      for i in range(self.net_num):
          end_index = end_index - self.net_op_nums[i]
          if end_index < 0:
              self.end_net_idx = i
              self.end_op_idx = end_index + self.net_op_nums[i]
              break
  
imports: import argparse
  import copy
  import os
  import sh
  import yaml
  from py_proto import mace_pb2
  from transform.base_converter import ConverterUtil
  from transform.base_converter import MaceKeyword
  from transform.base_converter import MaceOp
  from transform.hexagon_converter import HexagonOp
  from utils.config_parser import DataFormat
  from utils.config_parser import ModelKeys
  from utils.util import mace_check
label_desc: Use image node_id 3 for calling the MultiNetDefInfo obj's underlying member method code with example usage: obj.handle_index(layers) without return types