Use reduce_sum to reduce errors in reduce_mean

test/verify/test_block_reduce_small.cpp

@@ -24,6 +24,7 @@
 
 #include "verify_program.hpp"
 #include <migraphx/program.hpp>
+#include <migraphx/common.hpp>
 #include <migraphx/make_op.hpp>
 
 template <int N, migraphx::shape::type_t T>
@@ -36,7 +37,9 @@ struct test_block_reduce_small : verify_program<test_block_reduce_small<N, T>>
         migraphx::shape s{T, {2, N}};
         auto x = mm->add_parameter("x", s);
         auto y = mm->add_parameter("x", s);
-        auto r = mm->add_instruction(migraphx::make_op("reduce_mean", {{"axes", {1}}}), x);
+        auto two = mm->add_literal(migraphx::literal{migraphx::shape{s.type(), {1}}, {2}});
+        auto mul = migraphx::add_common_op(*mm, migraphx::make_op("mul"), {x, two});
+        auto r = mm->add_instruction(migraphx::make_op("reduce_sum", {{"axes", {1}}}), mul);
         auto rb =
             mm->add_instruction(migraphx::make_op("multibroadcast", {{"out_lens", s.lens()}}), r);
         auto add = mm->add_instruction(migraphx::make_op("add"), rb, y);