[Typing][B-64] Add type annotations for `python/paddle/text/datasets/…

…uci_housing.py` (PaddlePaddle#66057)


---------

Co-authored-by: SigureMo <sigure.qaq@gmail.com>

python/paddle/text/datasets/uci_housing.py

@@ -11,13 +11,22 @@
 # 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
+
+from typing import TYPE_CHECKING, Any, Literal
 
 import numpy as np
 
 import paddle
 from paddle.dataset.common import _check_exists_and_download
 from paddle.io import Dataset
 
+if TYPE_CHECKING:
+    import numpy.typing as npt
+
+    from paddle._typing.dtype_like import _DTypeLiteral
+
+    _UciHousingDataSetMode = Literal["train", "test"]
 __all__ = []
 
 URL = 'http://paddlemodels.bj.bcebos.com/uci_housing/housing.data'
@@ -45,11 +54,11 @@ class UCIHousing(Dataset):
     dataset
 
     Args:
-        data_file(str): path to data file, can be set None if
-            :attr:`download` is True. Default None
+        data_file(str|None): path to data file, can be set None if
+            :attr:`download` is True. Default None.
         mode(str): 'train' or 'test' mode. Default 'train'.
         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 UCI housing dataset.
@@ -93,7 +102,16 @@ class UCIHousing(Dataset):
 
     """
 
-    def __init__(self, data_file=None, mode='train', download=True):
+    mode: _UciHousingDataSetMode
+    data_file: str | None
+    dtype: _DTypeLiteral
+
+    def __init__(
+        self,
+        data_file: str | None = None,
+        mode: _UciHousingDataSetMode = 'train',
+        download: bool = True,
+    ) -> None:
         assert mode.lower() in [
             'train',
             'test',
@@ -114,7 +132,7 @@ def __init__(self, data_file=None, mode='train', download=True):
 
         self.dtype = paddle.get_default_dtype()
 
-    def _load_data(self, feature_num=14, ratio=0.8):
+    def _load_data(self, feature_num: int = 14, ratio: float = 0.8) -> None:
         data = np.fromfile(self.data_file, sep=' ')
         data = data.reshape(data.shape[0] // feature_num, feature_num)
         maximums, minimums, avgs = (
@@ -130,11 +148,13 @@ def _load_data(self, feature_num=14, ratio=0.8):
         elif self.mode == 'test':
             self.data = data[offset:]
 
-    def __getitem__(self, idx):
+    def __getitem__(
+        self, idx: int
+    ) -> tuple[npt.NDArray[Any], npt.NDArray[Any]]:
         data = self.data[idx]
         return np.array(data[:-1]).astype(self.dtype), np.array(
             data[-1:]
         ).astype(self.dtype)
 
-    def __len__(self):
+    def __len__(self) -> int:
         return len(self.data)