【PPSCI Doc No.104-105】 (#759)

* update docstring

* remove spaces in args

* update

* remove extra blank line

ppsci/utils/save_load.py

@@ -80,13 +80,22 @@ def _load_pretrain_from_path(
 def load_pretrain(
     model: nn.Layer, path: str, equation: Optional[Dict[str, equation.PDE]] = None
 ):
-    """Load pretrained model from given path or url.
+    """
+    Load pretrained model from given path or url.
 
     Args:
         model (nn.Layer): Model with parameters.
         path (str): File path or url of pretrained model, i.e. `/path/to/model.pdparams`
             or `http://xxx.com/model.pdparams`.
         equation (Optional[Dict[str, equation.PDE]]): Equations. Defaults to None.
+
+    Examples:
+        >>> import ppsci
+        >>> from ppsci.utils import save_load
+        >>> model = ppsci.arch.MLP(("x", "y"), ("u", "v", "p"), 9, 50, "tanh")
+        >>> save_load.load_pretrain(
+        ...     model=model,
+        ...     path="path/to/pretrain_model") # doctest: +SKIP
     """
     if path.startswith("http"):
         path = download.get_weights_path_from_url(path)
@@ -159,7 +168,8 @@ def save_checkpoint(
     equation: Optional[Dict[str, equation.PDE]] = None,
     print_log: bool = True,
 ):
-    """Save checkpoint, including model params, optimizer params, metric information.
+    """
+    Save checkpoint, including model params, optimizer params, metric information.
 
     Args:
         model (nn.Layer): Model with parameters.
@@ -172,6 +182,14 @@ def save_checkpoint(
         print_log (bool, optional): Whether print saving log information, mainly for
             keeping log tidy without duplicate 'Finish saving checkpoint ...' log strings.
             Defaults to True.
+
+    Examples:
+        >>> import ppsci
+        >>> import paddle
+        >>> from ppsci.utils import save_load
+        >>> model = ppsci.arch.MLP(("x", "y", "z"), ("u", "v", "w"), 5, 64, "tanh")
+        >>> optimizer = ppsci.optimizer.Adam(0.001)(model)
+        >>> save_load.save_checkpoint(model, optimizer, {"RMSE": 0.1}, output_dir="path/to/output/dir") # doctest: +SKIP
     """
     if paddle.distributed.get_rank() != 0:
         return