[ONNX] Extend ONNX FE with SoftSign-9 operation (#11766)

src/core/tests/models/onnx/softsign.prototxt

@@ -0,0 +1,42 @@
+ir_version: 11
+producer_name: "OV ONNX Importer"
+graph {
+  node {
+    input: "X"
+    output: "Y"
+    name: "node1"
+    op_type: "Softsign"
+    doc_string: "Softsign"
+    domain: ""
+  }
+  name: "test"
+  input {
+    name: "X"
+    type {
+      tensor_type {
+        elem_type: 1
+        shape {
+          dim {
+            dim_value: 10
+          }
+        }
+      }
+    }
+  }
+  output {
+    name: "Y"
+    type {
+      tensor_type {
+        elem_type: 1
+        shape {
+          dim {
+            dim_value: 10
+          }
+        }
+      }
+    }
+  }
+}
+opset_import {
+  version: 1
+}

src/frontends/onnx/frontend/src/op/softsign.cpp

@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "default_opset.hpp"
+#include "ngraph/opsets/opset9.hpp"
 #include "ngraph/shape.hpp"
 
 namespace ngraph {
@@ -15,19 +16,9 @@ namespace onnx_import {
 namespace op {
 namespace set_1 {
 OutputVector softsign(const Node& node) {
-    auto data = node.get_ng_inputs().at(0);
-
-    std::shared_ptr<ngraph::Node> one_node = default_opset::Constant::create(data.get_element_type(), Shape{}, {1});
-    auto abs_data = std::make_shared<default_opset::Abs>(data);
-    auto data_plus_one_node = std::make_shared<default_opset::Add>(abs_data, one_node);
-
-    return {std::make_shared<default_opset::Divide>(data, data_plus_one_node)};
+    return {std::make_shared<ngraph::opset9::SoftSign>(node.get_ng_inputs().at(0))};
 }
-
 }  // namespace set_1
-
 }  // namespace op
-
 }  // namespace onnx_import
-
 }  // namespace ngraph

src/frontends/onnx/frontend/src/op/softsign.hpp

@@ -14,9 +14,6 @@ namespace set_1 {
 OutputVector softsign(const Node& node);
 
 }  // namespace set_1
-
 }  // namespace op
-
 }  // namespace onnx_import
-
 }  // namespace ngraph

src/frontends/tests/onnx/onnx_import.in.cpp

@@ -5140,3 +5140,17 @@ NGRAPH_TEST(${BACKEND_NAME}, onnx_scan8_ND_b4_seq_lens) {
         FAIL() << "Expected exception was not thrown.";
     }
 }
+
+NGRAPH_TEST(${BACKEND_NAME}, onnx_model_softsign) {
+    auto model = onnx_import::import_onnx_model(file_util::path_join(SERIALIZED_ZOO, "onnx/softsign.onnx"));
+
+    Inputs inputs{std::vector<float>{1.0, 0.1, 20.0, 12.0, -12.0, -0.2, 0.5, 100.0, 0.0, -1.0}};
+
+    std::vector<float>
+        output{0.5, 0.09090909, 0.95238096, 0.9230769, -0.9230769, -0.16666666, 0.33333334, 0.990099, 0., -0.5};
+
+    auto test_case = test::TestCase(model, s_device);
+    test_case.add_multiple_inputs(inputs);
+    test_case.add_expected_output(output);
+    test_case.run();
+}