class_docstr: BytePairEncoder trains byte pair encoding and
  encodes words using trained encoding
class_docstr_tok: ["BytePairEncoder","trains","byte","pair","encoding","and","encodes","words","using","trained","encoding"]
docstr: Returns the id of the <UNK> token
  :rtype: bool.
docstr_tok: ["Returns","the","id","of","the","<","UNK",">","token",":","rtype",":","bool","."]
code: def unknown_token_id(self) -> int:
      """Returns the id of the <UNK> token
      :rtype: bool.
      """
      return self._internal.unknown_token_id()
  
file_path: neoml/NeoML/Python/neoml/BytePairEncoder.py
imports: import neoml.PythonWrapper
  import typing
label_desc: Use image node_id 12 for calling the BytePairEncoder obj's underlying member method code with example usage: obj.unknown_token_id() and returns: self