Unify folders for arithmetic reduction ops; add Max and Min

src/ngraph/pass/constant_folding.hpp

@@ -42,8 +42,7 @@ public:
         CONVERT,
         SHAPE_OF,
         REVERSE,
-        PRODUCT,
-        SUM,
+        ARITHMETIC_REDUCTION,
         CONCAT,
         GATHER,
         SLICE,
@@ -66,8 +65,7 @@ public:
         construct_constant_convert();
         construct_constant_shape_of();
         construct_constant_reverse();
-        construct_constant_product();
-        construct_constant_sum();
+        construct_constant_arithmetic_reduction();
         construct_constant_concat();
         construct_constant_gather();
         construct_constant_slice();
@@ -97,8 +95,9 @@ public:
             case CFTransformations::CONVERT: construct_constant_convert(); break;
             case CFTransformations::SHAPE_OF: construct_constant_shape_of(); break;
             case CFTransformations::REVERSE: construct_constant_reverse(); break;
-            case CFTransformations::PRODUCT: construct_constant_product(); break;
-            case CFTransformations::SUM: construct_constant_sum(); break;
+            case CFTransformations::ARITHMETIC_REDUCTION:
+                construct_constant_arithmetic_reduction();
+                break;
             case CFTransformations::CONCAT: construct_constant_concat(); break;
             case CFTransformations::GATHER: construct_constant_gather(); break;
             case CFTransformations::SLICE: construct_constant_slice(); break;
@@ -120,8 +119,7 @@ private:
     void construct_constant_convert();
     void construct_constant_shape_of();
     void construct_constant_reverse();
-    void construct_constant_product();
-    void construct_constant_sum();
+    void construct_constant_arithmetic_reduction();
     void construct_constant_concat();
     void construct_constant_gather();
     void construct_constant_slice();

src/ngraph/runtime/reference/max.hpp

@@ -36,7 +36,7 @@ namespace ngraph
                      const AxisSet& reduction_axes)
             {
                 T minval = std::numeric_limits<T>::has_infinity
-                               ? -std::numeric_limits<T>::infinity()
+                               ? T(-std::numeric_limits<T>::infinity())
                                : std::numeric_limits<T>::min();
 
                 CoordinateTransform output_transform(out_shape);

test/constant_folding.cpp

@@ -434,6 +434,58 @@ TEST(constant_folding, const_sum)
     ASSERT_EQ(values_expected, values_out);
 }
 
+TEST(constant_folding, const_max)
+{
+    Shape input_shape{3, 3};
+
+    vector<int32_t> values_in{1, 2, 3, 4, 5, 6, 7, 8, 9};
+    auto constant = op::Constant::create(element::i32, input_shape, values_in);
+    auto convert = make_shared<op::Max>(constant, AxisSet{1});
+    auto f = make_shared<Function>(convert, ParameterVector{});
+
+    pass::Manager pass_manager;
+    pass_manager.register_pass<pass::ConstantFolding>();
+    pass_manager.run_passes(f);
+
+    ASSERT_EQ(count_ops_of_type<op::Max>(f), 0);
+    ASSERT_EQ(count_ops_of_type<op::Constant>(f), 1);
+
+    auto new_const =
+        std::dynamic_pointer_cast<op::Constant>(f->get_results().at(0)->get_argument(0));
+    ASSERT_TRUE(new_const);
+    auto values_out = new_const->get_vector<int32_t>();
+
+    vector<int32_t> values_expected{3, 6, 9};
+
+    ASSERT_EQ(values_expected, values_out);
+}
+
+TEST(constant_folding, const_min)
+{
+    Shape input_shape{3, 3};
+
+    vector<int32_t> values_in{1, 2, 3, 4, 5, 6, 7, 8, 9};
+    auto constant = op::Constant::create(element::i32, input_shape, values_in);
+    auto convert = make_shared<op::Min>(constant, AxisSet{1});
+    auto f = make_shared<Function>(convert, ParameterVector{});
+
+    pass::Manager pass_manager;
+    pass_manager.register_pass<pass::ConstantFolding>();
+    pass_manager.run_passes(f);
+
+    ASSERT_EQ(count_ops_of_type<op::Min>(f), 0);
+    ASSERT_EQ(count_ops_of_type<op::Constant>(f), 1);
+
+    auto new_const =
+        std::dynamic_pointer_cast<op::Constant>(f->get_results().at(0)->get_argument(0));
+    ASSERT_TRUE(new_const);
+    auto values_out = new_const->get_vector<int32_t>();
+
+    vector<int32_t> values_expected{1, 4, 7};
+
+    ASSERT_EQ(values_expected, values_out);
+}
+
 TEST(constant_folding, const_concat)
 {
     auto constant0 =