code: def get_model_spec(idx: int | str) -> dict | Any:
      """get model specification by `idx`. `idx` could be index of the constant tuple of dict or the actual model ID."""
      if isinstance(idx, int):
          return MODEL_DESC[idx]
      if isinstance(idx, str):
          key = idx.strip().lower()
          for cand in MODEL_DESC:
              if str(cand.get(Keys.ID)).strip().lower() == key:
                  return cand
      return idx
  
imports: from __future__ import annotations
  import json
  import os
  import warnings
  from collections.abc import Mapping
  from pathlib import Path
  from typing import Any
  import torch
  import monai.networks.nets
  from monai.apps.utils import download_and_extract, logger
  from monai.config.type_definitions import PathLike
  from monai.networks.utils import copy_model_state
  from monai.utils.module import optional_import
  from .model_desc import MODEL_DESC
  from .model_desc import RemoteMMARKeys
label_desc: Use image node_id 1 for calling a global function with example usage: get_model_spec(idx) and returns: idx, MODEL_DESC, cand