code: def vocab_size(self):
      return 50269
  
imports: import os
  import finetune
  from finetune.encoding.input_encoder import BaseEncoder, EncodedOutput
  from finetune.base_models.gpt2.encoder import GPT2Encoder, bytes_to_unicode
  from finetune.base_models.gpt2 import encoder
  from transformers import RobertaTokenizerFast
label_desc: Use image node_id 2 for calling the RoBERTaEncoderV2 obj's underlying member method code with example usage: obj.vocab_size() and returns: int