fix style bug

ding/utils/import_helper.py

@@ -121,7 +121,7 @@ def try_import_pyarrow():
 def try_import_pickle():
     try:
         import pickle5 as pickle
-        assert sys.version_info > (3, 8)
+        assert sys.version_info >= (3, 8)
     except ModuleNotFoundError as e:
         import pickle
         assert sys.version_info < (3, 8)

ding/utils/serialize_zoo.py

@@ -63,4 +63,4 @@ class SerializedZoo:
         if self.type == 'mp_pyarrow':
             return MultiprocessingPyarrow(
                 self.var, self.shape, self.cpu_count, mode='load', byte_length=self.byte_length
-            ).unpack()
+            ).unpack()
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