code: def _clean_and_filter_nulls_and_empties_from_dataframe(self):
      return self.data_frame.loc[
          lambda df: df[[self._category_col, self._text_col]]
          .dropna()
          .index
      ][lambda df: df[self._text_col] != ""].reset_index()
  
imports: import numpy
  import pandas
  from scattertext.AsianNLP import chinese_nlp
  from scattertext.CSRMatrixTools import CSRMatrixFactory
  from scattertext.TermDocMatrix import TermDocMatrix
  from scattertext.TermDocMatrixFactory import TermDocMatrixFactory
  from scattertext.TermDocMatrixWithoutCategories import TermDocMatrixWithoutCategories
  from scattertext.indexstore.IndexStore import IndexStore
label_desc: Use image node_id 6 for calling the TermDocMatrixFromPandas obj's underlying member method code with example usage: obj._clean_and_filter_nulls_and_empties_from_dataframe() and returns: self