docstr: From https://docs.aleph-alpha.com/api/complete, "the summed number of tokens of prompt
  and maximum_tokens..may not exceed 2048 tokens." Confirmed it's 2048 for the Luminous
  models currently available.
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code: def max_sequence_length(self) -> int:
      """
      From https://docs.aleph-alpha.com/api/complete, "the summed number of tokens of prompt
      and maximum_tokens..may not exceed 2048 tokens." Confirmed it's 2048 for the Luminous
      models currently available.
      """
      return 2048
  
imports: from abc import abstractmethod
  from .local_window_service import LocalWindowService
  from .tokenizer_service import TokenizerService
label_desc: Use image node_id 3 for calling the LuminousWindowService obj's underlying member method code with example usage: obj.max_sequence_length() and returns: int