code: def get_ranks(self, label_append=" freq"):
      mat = self._corpus.get_term_count_mat(
          non_text=self._use_non_text_features
      )
      return self.get_ranks_from_mat(mat, label_append)
  
imports: import pandas
  from scattertext.termranking.TermRanker import TermRanker
label_desc: Use image node_id 1 for calling the OncePerDocFrequencyRanker obj's underlying member method code with example usage: obj.get_ranks(label_append) and returns: self