Fixed Selu op decomposition (#3976)

* Fixed Selu op decomposition

* Updated Selu op

src/ngraph/op/fused/selu.cpp

@@ -39,12 +39,18 @@ NodeVector op::v0::Selu::decompose_op() const
     const auto data = input_value(0);
     const auto alpha = input_value(1);
     const auto lambda = input_value(2);
-    const auto zero_node = std::make_shared<ngraph::op::Constant>(
-        data.get_element_type(), data.get_shape(), std::vector<double>{0});
-    return {lambda *
-            (std::make_shared<op::Maximum>(data, zero_node) +
-             alpha * std::make_shared<op::Exp>(std::make_shared<op::Minimum>(data, zero_node)) -
-             alpha)};
+    const auto zero_node = op::Constant::create(data.get_element_type(), Shape{1}, {0});
+
+    // lambda * ((max(data, 0) + (alpha * exp(min(data, 0)) - alpha))
+    return {std::make_shared<op::v1::Multiply>(
+        lambda,
+        std::make_shared<op::v1::Add>(
+            std::make_shared<op::v1::Maximum>(data, zero_node),
+            std::make_shared<op::v1::Subtract>(
+                std::make_shared<op::v1::Multiply>(
+                    alpha,
+                    std::make_shared<op::Exp>(std::make_shared<op::v1::Minimum>(data, zero_node))),
+                alpha)))};
 }
 
 shared_ptr<Node> op::v0::Selu::copy_with_new_args(const NodeVector& new_args) const