Add a float16 restriction in the solution of reduction op's precision problem in graph splitter.

mindspore/_extends/graph_kernel/model/graph_split.py

@@ -283,8 +283,9 @@ class GraphSplitByPattern:
             if _check_reduce_exclude(dom):
                 return None
             a, r = list(dom.in_relations.items())[0]
-            if a.is_output and len(a.ops) >= 10 and _is_atomic_add_available(dom):
-                # to evade the precision problem in akg
+            if dom.ops[0].inputs[0].dtype == "float16" and a.is_output and len(a.ops) >= 10 and \
+                    _is_atomic_add_available(dom):
+                # to evade the precision problem.
                 return None
             if _reduce_pat_exclude(dom, a, r) or len(a.out_relations) != 1:
                 return None
@@ -295,10 +296,12 @@ class GraphSplitByPattern:
                 return None
             if _check_reduce_exclude(dom):
                 return None
-            if len(dom.ops) == 1:
-                return None
             fused = []
             for a, r in dom.in_relations.items():
+                if dom.ops[0].inputs[0].dtype == "float16" and a.is_output and len(a.ops) >= 10 and \
+                        _is_atomic_add_available(dom):
+                    # to evade the precision problem.
+                    continue
                 if not _reduce_pat_exclude(dom, a, r) and a.check_circle(dom):
                     fused.append(a)
             return fused, True