class_docstr: AI21 Labs provides Jurassic models.
  https://studio.ai21.com/docs/api/
code: def decode(self, request: DecodeRequest) -> DecodeRequestResult:
      raise NotImplementedError("Not supported")
  
file_path: H2O/h2o_hf/helm/src/helm/proxy/clients/ai21_client.py
imports: from typing import Dict, List
  import requests
  from dacite import from_dict
  from helm.common.cache import Cache, CacheConfig
  from helm.common.request import EMBEDDING_UNAVAILABLE_REQUEST_RESULT, Request, RequestResult, Sequence, Token
  from helm.common.tokenization_request import TokenizationRequest, TokenizationRequestResult, TokenizationToken, TextRange, DecodeRequest, DecodeRequestResult
  from .client import Client, wrap_request_time, truncate_sequence
label_desc: Use image node_id 5 for calling the AI21Client obj's underlying member method code with example usage: obj.decode(request) without return types