code: def build_vocab_k_words(self, K):
      assert hasattr(self, "w2v_path"), "w2v path not set"
      self.word_vec = self.get_w2v_k(K)
  
imports: import time
  import numpy
  import torch
  from torch import nn
  import textattack
label_desc: Use image node_id 9 for calling the InferSentModel obj's underlying member method code with example usage: obj.build_vocab_k_words(K) without return types