Fix state dict api en doc (PaddlePaddle#59793)

* exclude xpu

* fix save and load doc and not expose api in checkpoint dir

* skip example

* fix doc

python/paddle/distributed/checkpoint/__init__.py

@@ -11,11 +11,3 @@
 # 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 .save_state_dict import save_state_dict
-from .load_state_dict import load_state_dict
-
-__all__ = [
-    "save_state_dict",
-    "load_state_dict",
-]

python/paddle/distributed/checkpoint/load_state_dict.py

@@ -360,14 +360,17 @@ def load_state_dict(
 ) -> None:
     """
     Load the state_dict inplace from a checkpoint path.
+
     Args:
         state_dict(Dict[str, paddle.Tensor]): The state_dict to load. It will be modified inplace after loading.
         path(str): The directory to load checkpoint files.
         process_group(paddle.distributed.collective.Group): ProcessGroup to be used for cross-rank synchronization. Use the default process group which contains all cards.
         coordinator_rank(int): The rank used to coordinate the checkpoint. Rank0 is used by default.
+
     Example:
         .. code-block:: python
-            >>> # doctest: +SKIP('Load state dict.')
+
+            >>> # doctest: +SKIP('run in distributed mode.')
             >>> import paddle
             >>> import paddle.distributed as dist
             >>> ckpt_path = "./checkpoint"

python/paddle/distributed/checkpoint/save_state_dict.py

@@ -88,7 +88,8 @@ def save_state_dict(
 
     Examples:
         .. code-block:: python
-            >>> # doctest: +SKIP('Save state dict.')
+
+            >>> # doctest: +SKIP('run in distributed mode')
             >>> import paddle
             >>> import paddle.distributed as dist
             >>> w1 = paddle.arange(32).reshape([4, 8])