class_docstr: Vose's Alias Method.
      
code: def size(self):
      return self.__prob.shape[0]
  
file_path: PaddleHub/modules/text/language_model/lda_news/vose_alias.py
imports: import numpy
  from lda_news.util import rand, rand_k
label_desc: Use image node_id 4 for calling the VoseAlias obj's underlying member method code with example usage: obj.size() and returns: self