docstr: The number of tokens for this sequence that have completed a forward pass.
docstr_tok: ["The","number","of","tokens","for","this","sequence","that","have","completed","a","forward","pass","."]
code: def seen_tokens(self) -> int:
      """
      The number of tokens for this sequence that have completed a forward pass.
      """
      raise NotImplementedError()
  
imports: from typing import List, Tuple, Union
  import torch
label_desc: Use image node_id 1 for calling the BaseSequenceDescriptor obj's underlying member method code with example usage: obj.seen_tokens() without return types