class_docstr: T5 Agent.
  
  Relies on the T5 model implemented in huggingface
class_docstr_tok: ["T5","Agent",".","Relies","on","the","T5","model","implemented","in","huggingface"]
code: def add_cmdline_args(
      cls, parser: ParlaiParser, partial_opt: Optional[Opt] = None
  ) -> ParlaiParser:
      super().add_cmdline_args(parser, partial_opt=partial_opt)
      group = parser.add_argument_group("T5 Args")
      group.add_argument(
          "--t5-model-arch",
          type=str,
          default="t5-base",
          choices=[
              "t5-small",
              "t5-base",
              "t5-large",
              "t5-3b",
              "t5-11b",
              "google/flan-t5-small",
              "google/flan-t5-base",
              "google/flan-t5-large",
              "google/flan-t5-xl",
              "google/flan-t5-xxl",
          ],
      )
      group.add_argument(
          "--t5-model-parallel",
          type="bool",
          default=False,
          help="use HF model parallel",
      )
      group.add_argument(
          "--t5-dropout", type=float, default=0.0, help="Dropout for T5"
      )
      group.add_argument(
          "--t5-generation-config",
          type=str,
          default=None,
          choices=[
              "summarization",
              "translation_en_to_de",
              "translation_en_to_fr",
              "translation_en_to_ro",
          ],
          help="Task specific generation config for T5",
      )
      return parser
  
imports: import torch
  from typing import Optional, Dict, Any, Tuple
  from transformers import T5ForConditionalGeneration
  from parlai.agents.hugging_face.hugging_face import HF_VERSION
  from parlai.agents.hugging_face.dict import T5DictionaryAgent
  from parlai.core.opt import Opt
  from parlai.core.params import ParlaiParser
  from parlai.core.torch_agent import Batch, TorchAgent
  from parlai.core.torch_generator_agent import TorchGeneratorAgent, TorchGeneratorModel
  from parlai.utils.fsdp import is_fsdp, delay_halving
label_desc: Use image node_id 1 for calling the T5Agent obj's underlying member method code with example usage: obj.add_cmdline_args(cls, parser, partial_opt) and returns: parser