text: from pathlib import Path
  
  import pandas as pd
  
  from .base import BaseMovieLenstDataLoader
  
  
  class MovieLens20MDataManager(BaseMovieLenstDataLoader):
      DOWNLOAD_URL = "http://files.grouplens.org/datasets/movielens/ml-20m.zip"
      DEFAULT_PATH = Path("~/.ml-20m.zip").expanduser()
      INTERACTION_PATH = "ml-20m/ratings.csv"
  
      def read_interaction(self) -> pd.DataFrame:
          with self._read_as_istream(self.INTERACTION_PATH) as ifs:
              df = pd.read_csv(ifs)
              df["timestamp"] = pd.to_datetime(df["timestamp"], unit="s")
              return df
  