[Typing][B-63] Add type annotations for `python/paddle/text/datasets/…

…movielens.py` (#66054)

python/paddle/text/datasets/movielens.py

@@ -11,15 +11,21 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+from __future__ import annotations
 
 import re
 import zipfile
+from typing import TYPE_CHECKING, Any, Literal
 
 import numpy as np
 
 from paddle.dataset.common import _check_exists_and_download
 from paddle.io import Dataset
 
+if TYPE_CHECKING:
+    import numpy.typing as npt
+
+    _MovieLensDataSetMode = Literal["train", "test"]
 __all__ = []
 
 age_table = [1, 18, 25, 35, 45, 50, 56]
@@ -33,7 +39,11 @@ class MovieInfo:
     Movie id, title and categories information are stored in MovieInfo.
     """
 
-    def __init__(self, index, categories, title):
+    index: int
+    categories: list[str]
+    title: str
+
+    def __init__(self, index: str, categories: list[str], title: str) -> None:
         self.index = int(index)
         self.categories = categories
         self.title = title
@@ -48,14 +58,14 @@ def value(self, categories_dict, movie_title_dict):
             [movie_title_dict[w.lower()] for w in self.title.split()],
         ]
 
-    def __str__(self):
+    def __str__(self) -> str:
         return "<MovieInfo id(%d), title(%s), categories(%s)>" % (
             self.index,
             self.title,
             self.categories,
         )
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return self.__str__()
 
 
@@ -64,7 +74,12 @@ class UserInfo:
     User id, gender, age, and job information are stored in UserInfo.
     """
 
-    def __init__(self, index, gender, age, job_id):
+    index: int
+    is_male: bool
+    age: int
+    job_id: int
+
+    def __init__(self, index: str, gender: str, age: str, job_id: str) -> None:
         self.index = int(index)
         self.is_male = gender == 'M'
         self.age = age_table.index(int(age))
@@ -81,15 +96,15 @@ def value(self):
             [self.job_id],
         ]
 
-    def __str__(self):
+    def __str__(self) -> str:
         return "<UserInfo id(%d), gender(%s), age(%d), job(%d)>" % (
             self.index,
             "M" if self.is_male else "F",
             age_table[self.age],
             self.job_id,
         )
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return str(self)
 
 
@@ -98,16 +113,16 @@ class Movielens(Dataset):
     Implementation of `Movielens 1-M <https://grouplens.org/datasets/movielens/1m/>`_ dataset.
 
     Args:
-        data_file(str): path to data tar file, can be set None if
-            :attr:`download` is True. Default None
+        data_file(str|None): path to data tar file, can be set None if
+            :attr:`download` is True. Default None.
         mode(str): 'train' or 'test' mode. Default 'train'.
         test_ratio(float): split ratio for test sample. Default 0.1.
         rand_seed(int): random seed. Default 0.
         download(bool): whether to download dataset automatically if
-            :attr:`data_file` is not set. Default True
+            :attr:`data_file` is not set. Default True.
 
     Returns:
-        Dataset: instance of Movielens 1-M dataset
+        Dataset: instance of Movielens 1-M dataset.
 
     Examples:
 
@@ -149,14 +164,24 @@ class Movielens(Dataset):
 
     """
 
+    mode: _MovieLensDataSetMode
+    data_file: str | None
+    test_ratio: float
+    rand_seed: int
+    movie_info: dict[int, MovieInfo]
+    movie_title_dict: dict[str, int]
+    categories_dict: dict[str, int]
+    user_info: dict[int, UserInfo]
+    data: list[list[float]]
+
     def __init__(
         self,
-        data_file=None,
-        mode='train',
-        test_ratio=0.1,
-        rand_seed=0,
-        download=True,
-    ):
+        data_file: str | None = None,
+        mode: _MovieLensDataSetMode = 'train',
+        test_ratio: float = 0.1,
+        rand_seed: int = 0,
+        download: bool = True,
+    ) -> None:
         assert mode.lower() in [
             'train',
             'test',
@@ -179,7 +204,7 @@ def __init__(
         self._load_meta_info()
         self._load_data()
 
-    def _load_meta_info(self):
+    def _load_meta_info(self) -> None:
         pattern = re.compile(r'^(.*)\((\d+)\)$')
         self.movie_info = {}
         self.movie_title_dict = {}
@@ -218,7 +243,7 @@ def _load_meta_info(self):
                             index=uid, gender=gender, age=age, job_id=job
                         )
 
-    def _load_data(self):
+    def _load_data(self) -> None:
         self.data = []
         is_test = self.mode == 'test'
         with zipfile.ZipFile(self.data_file) as package:
@@ -241,9 +266,9 @@ def _load_data(self):
                             + [[rating]]
                         )
 
-    def __getitem__(self, idx):
+    def __getitem__(self, idx: int) -> tuple[npt.NDArray[Any], ...]:
         data = self.data[idx]
         return tuple([np.array(d) for d in data])
 
-    def __len__(self):
+    def __len__(self) -> int:
         return len(self.data)