use strameline vocab by default if nmers > 1

multimolecule/tokenisers/rna/tokenization_rna.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import os
 from typing import List, Optional
 
@@ -28,11 +30,12 @@ def __init__(
         convert_to_uppercase: bool = True,
         convert_T_to_U: bool = True,
         nmers: int = 1,
-        strameline: bool = False,
+        strameline: bool | None = None,
         **kwargs,
     ):
         self.nmers = nmers
-        self.all_tokens = get_vocab_list(nmers, strameline)
+        self.strameline = strameline if strameline is not None else nmers > 1
+        self.all_tokens = get_vocab_list(nmers, self.strameline)
         self._id_to_token = dict(enumerate(self.all_tokens))
         self._token_to_id = {tok: ind for ind, tok in enumerate(self.all_tokens)}
         self.convert_to_uppercase = convert_to_uppercase