class_docstr: Transforms an input by adding summaries of person and movies provided
  by csv.
  
  Example::
  
      ori: Titanic is my favorite movie.
      trans: Titanic(A seventeen-year-old aristocrat falls in love with a
      kind but poor artist aboard the
             luxurious,ill-fated R.M.S. Titanic.) is my favorite movie.
code: def __repr__(self):
      return "AddSum" + "-" + self.entity_type
  
file_path: textflint/textflint/generation/transformation/SA/add_sum.py
imports: from ..transformation import Transformation
  from ....common.settings import SA_PERSON_PATH, SA_MOVIE_PATH
  from ....common.utils.install import download_if_needed
  from ....common.utils.load import sa_dict_loader
label_desc: Use image node_id 2 for calling the AddSum obj's underlying member method code with example usage: obj.__repr__() and returns: unknown