class_docstr: Abstract class for building a vocabulary from a dataset.
class_docstr_tok: ["Abstract","class","for","building","a","vocabulary","from","a","dataset","."]
docstr: Extends vocabulary from a dataset
  
  Parameters
  ----------
  dataset: Dataset
      dataset used for extending vocabulary
docstr_tok: ["Extends","vocabulary","from","a","dataset","Parameters","--","--","--","--","--","dataset",":","Dataset","dataset","used","for","extending","vocabulary"]
code: def extend(self, dataset: Dataset):
      """Extends vocabulary from a dataset
  
      Parameters
      ----------
      dataset: Dataset
          dataset used for extending vocabulary
      """
      raise NotImplementedError()
  
imports: from deepchem.data import Dataset
label_desc: Use image node_id 4 for calling the VocabularyBuilder obj's underlying member method code with example usage: obj.extend(dataset) without return types