[AutoScheduler] Fix deserization of workload registry entry (apache#8662)

Author: vinx13

python/tvm/auto_scheduler/workload_registry.py

@@ -245,7 +245,9 @@ def deserialize_workload_registry_entry(data):
     name, value = data
     if name not in WORKLOAD_FUNC_REGISTRY:
         # pylint: disable=assignment-from-no-return
-        WORKLOAD_FUNC_REGISTRY[name] = LoadJSON(value)
+        if not callable(value):
+            value = LoadJSON(value)
+        WORKLOAD_FUNC_REGISTRY[name] = value
 
 
 def save_workload_func_registry(filename):

tests/python/unittest/test_auto_scheduler_measure.py

@@ -293,6 +293,15 @@ def test_dag_measure_local_builder_runner():
         assert mress[0].error_no == 0
 
 
+def test_workload_serialization():
+    key = tvm.auto_scheduler.utils.get_func_name(matmul_auto_scheduler_test)
+    transfer_data = workload_registry.serialize_workload_registry_entry(key)
+    f_data = pickle.dumps(transfer_data)
+    f_new = pickle.loads(f_data)
+    del workload_registry.WORKLOAD_FUNC_REGISTRY[key]
+    workload_registry.deserialize_workload_registry_entry(f_new)
+
+
 def test_measure_local_builder_rpc_runner():
     if not tvm.testing.device_enabled("llvm"):
         return
@@ -423,6 +432,7 @@ def foo():
     test_workload_dis_factor()
     test_measure_local_builder_runner()
     test_dag_measure_local_builder_runner()
+    test_workload_serialization()
     test_measure_local_builder_rpc_runner()
     test_measure_target_host()
     test_measure_special_inputs_map_by_name_local_runner()