Hotfix: Remove duplicate node_types in NeighborLoader with FeatureStore (#4856)

* fix

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: ZenoTan

torch_geometric/data/feature_store.py

@@ -329,7 +329,8 @@ def get_tensor(self, *args, **kwargs) -> FeatureTensorType:
         return self._to_type(attr, tensor)
 
     def _multi_get_tensor(
-            self, attrs: List[TensorAttr]) -> Optional[FeatureTensorType]:
+            self,
+            attrs: List[TensorAttr]) -> List[Optional[FeatureTensorType]]:
         r"""To be implemented by :class:`FeatureStore` subclasses.
 
         .. note::

torch_geometric/loader/neighbor_loader.py

@@ -108,9 +108,8 @@ def __init__(
             node_attrs = feature_store.get_all_tensor_attrs()
             edge_attrs = graph_store.get_all_edge_attrs()
 
-            self.node_types = [
-                node_attr.group_name for node_attr in node_attrs
-            ]
+            self.node_types = list(
+                set(node_attr.group_name for node_attr in node_attrs))
             self.edge_types = [edge_attr.edge_type for edge_attr in edge_attrs]
 
             # Set other required parameters: