revert minor changes

Author: jgbradley1

graphrag/storage/factory.py

@@ -40,9 +40,6 @@ def register(
             storage_type: The type identifier for the storage.
             creator: A class or callable that creates an instance of PipelineStorage.
 
-        Raises
-        ------
-            TypeError: If creator is a class type instead of a factory function.
         """
         cls._registry[storage_type] = creator
 

graphrag/storage/memory_pipeline_storage.py

@@ -18,11 +18,7 @@ class MemoryPipelineStorage(FilePipelineStorage):
 
     def __init__(self):
         """Init method definition."""
-        # MemoryPipelineStorage doesn't need actual file storage, use temp dir
-        import tempfile
-
-        temp_dir = tempfile.mkdtemp()
-        super().__init__(base_dir=temp_dir)
+        super().__init__()
         self._storage = {}
 
     async def get(