docs: def to_latex(self):
          """ Returns a LaTeX representation of an attribute-value matrix """
          latex = r"[{} " 
          for attribute, value in self:
              if attribute in ['speaker_model', 'is_in_commonground']: continue
              value_l = value.to_latex()
              if value_l == "": continue
              latex += "{attribute:<15} &  {value:<20} \\\\ \n".format(attribute=attribute, value=value_l)
          latex += "]\n"
          return latex