code: def get_special_model_spec(
      region: str = None,
      model_id: str = None,
      version: str = None,
      s3_client: boto3.client = None,
  ) -> JumpStartModelSpecs:
      """This function mocks cache accessor functions. For this mock,
      we only retrieve model specs based on the model ID. This is reserved
      for special specs.
      """
  
      specs = JumpStartModelSpecs(SPECIAL_MODEL_SPECS_DICT[model_id])
      return specs
  
file_path: sagemaker-python-sdk/tests/unit/sagemaker/jumpstart/utils.py
imports: from __future__ import absolute_import
  import copy
  from typing import List
  import boto3
  from sagemaker.jumpstart.cache import JumpStartModelsCache
  from sagemaker.jumpstart.constants import JUMPSTART_DEFAULT_REGION_NAME, JUMPSTART_LOGGER, JUMPSTART_REGION_NAME_SET
  from sagemaker.jumpstart.types import JumpStartCachedS3ContentKey, JumpStartCachedS3ContentValue, JumpStartModelSpecs, JumpStartS3FileType, JumpStartModelHeader
  from sagemaker.jumpstart.utils import get_formatted_manifest
  from tests.unit.sagemaker.jumpstart.constants import PROTOTYPICAL_MODEL_SPECS_DICT, BASE_MANIFEST, BASE_SPEC, BASE_HEADER, SPECIAL_MODEL_SPECS_DICT
label_desc: Use image node_id 4 for calling a global function with example usage: get_special_model_spec(region, model_id, version, s3_client) and returns: specs