delete useless code for allreduce

mindspore/ops/operations/comm_ops.py

@@ -100,11 +100,6 @@ class AllReduce(PrimitiveWithInfer):
         self.add_prim_attr('fusion', 0)
         self.add_prim_attr('index', 0)
 
-    def vm_impl(self, x):
-        """Implement by vm mode."""
-        x = x.asnumpy()
-        return Tensor(x)
-
     def infer_shape(self, x_shape):
         return x_shape
 

tests/ut/cpp/parallel/step_parallel_test.cc

@@ -294,9 +294,6 @@ TEST_F(TestStepParallel, CreatOpInstance) {
   ASSERT_TRUE(allreduce_ptr);
   if (nullptr != allreduce_ptr) {
     MS_LOG(INFO) << "Get PrimitivePyPtr: " << allreduce_ptr->name();
-    if (!allreduce_ptr->HasComputeFunction()) {
-      MS_LOG(EXCEPTION) << "" << allreduce_ptr->name() << "'s compute function is not implemented";
-    }
 
     std::vector<py::object> arglist;
     (void)std::transform(attrs.begin(), attrs.end(), std::back_inserter(arglist),