code: def str_to_range(range_str: str):
      defaults = [None, None]
      slice_values = chain(range_str.strip().split(":"), defaults)
  
      start, stop, step, *_ = map(
          lambda x: int(x) if x else None, slice_values
      )
      return IndexRange(start, stop)
  
imports: import asyncio
  import numpy
  import random
  import struct
  import time
  from collections import namedtuple
  from itertools import chain
  from typing import Iterator, Tuple, Optional, List
  from typing import TYPE_CHECKING
  from fastapi import HTTPException
  from aim.storage.context import Context
  from aim.sdk import Run
  from aim.sdk.sequences.metric import Metric
  from aim.sdk.sequence_collection import SequenceCollection
  from aim.storage.query import syntax_error_check
  from aim.web.configs import AIM_PROGRESS_REPORT_INTERVAL
  from aim.web.api.projects.project import Project
  from aim.web.api.runs.pydantic_models import AlignedRunIn, TraceBase
  from aim.storage.treeutils import encode_tree
label_desc: Use image node_id 2 for calling a global function with example usage: str_to_range(range_str) and returns: IndexRange