docstr: Return the max sequence length.
code: def max_sequence_length(self) -> int:
      """Return the max sequence length."""
      # We subtract 1 to account for <extra_id_0> that gets appended to prompts.
      return 512 - 1
  
file_path: H2O/h2o_hf/helm/src/helm/benchmark/window_services/flan_t5_window_service.py
imports: from .encoder_decoder_window_service import EncoderDecoderWindowService
  from .tokenizer_service import TokenizerService
label_desc: Use image node_id 2 for calling the FlanT5WindowService obj's underlying member method code with example usage: obj.max_sequence_length() and returns: unknown