code: def eval(self, input_filepath, args=None):
      raise NotImplementedError("eval() is currently not available")
  
file_path: happy-transformer/happytransformer/happy_next_sentence.py
imports: from typing import Union
  import torch
  from transformers import AutoModelForNextSentencePrediction
  from happytransformer.adaptors import get_adaptor
  from happytransformer.happy_transformer import HappyTransformer
label_desc: Use image node_id 4 for calling the HappyNextSentence obj's underlying member method code with example usage: obj.eval(input_filepath, args) without return types