Merge pull request #18943 from mpashchenkov:mp/onnx-padding

G-API: ONNX. Support for networks with three dimensional input.

* Padding without tests

* Removed padding

* Some small fixes

* Added wstring_convert

* Alignment fix, m b

* Small fixes

* Moved include from onnx.hpp

modules/gapi/test/infer/gapi_infer_onnx_test.cpp

@@ -11,6 +11,7 @@
 #include <stdexcept>
 #include <onnxruntime_cxx_api.h>
 #include <ade/util/iota_range.hpp>
+#include <codecvt> // wstring_convert
 
 #include <opencv2/gapi/own/convert.hpp>
 #include <opencv2/gapi/infer/onnx.hpp>
@@ -257,7 +258,13 @@ public:
     template<typename T>
     void infer(const std::vector<cv::Mat>& ins, std::vector<cv::Mat>& outs) {
         // Prepare session
+#ifndef _WIN32
         session = Ort::Session(env, model_path.data(), session_options);
+#else
+        std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> converter;
+        std::wstring w_model_path = converter.from_bytes(model_path.data());
+        session = Ort::Session(env, w_model_path.data(), session_options);
+#endif
         num_in = session.GetInputCount();
         num_out = session.GetOutputCount();
         GAPI_Assert(num_in == ins.size());
@@ -910,7 +917,6 @@ TEST_F(ONNXYoloV3MultiInput, InferBSConstInput)
     // Validate
     validate();
 }
-
 } // namespace opencv_test
 
 #endif //  HAVE_ONNX