Run Reshape layer for const input from ONNX models

modules/dnn/src/onnx/onnx_importer.cpp

@@ -140,9 +140,10 @@ Mat getMatFromTensor(opencv_onnx::TensorProto& tensor_proto)
     return blob;
 }
 
-void runLayer(Ptr<Layer> layer, const std::vector<Mat>& inputs,
+void runLayer(LayerParams& params, const std::vector<Mat>& inputs,
               std::vector<Mat>& outputs)
 {
+    Ptr<Layer> layer = LayerFactory::createLayerInstance(params.type, params);
     std::vector<MatShape> inpShapes(inputs.size());
     int ddepth = CV_32F;
     for (size_t i = 0; i < inputs.size(); ++i)
@@ -669,14 +670,15 @@ void ONNXImporter::populateNet(Net dstNet)
                 Mat blob = getBlob(node_proto, constBlobs, 1);
                 CV_Assert(blob.type() == CV_32SC1);
 
+                layerParams.set("dim", DictValue::arrayInt<int*>(
+                            blob.ptr<int>(), blob.total() ));
+
                 if (layer_id.find(node_proto.input(0)) == layer_id.end()) {
-                    Mat input = getBlob(node_proto, constBlobs, 0);
-                    Mat out = input.reshape(0, static_cast<std::vector<int> >(blob));
-                    constBlobs.insert(std::make_pair(layerParams.name, out));
+                    std::vector<Mat> inputs(1, getBlob(node_proto, constBlobs, 0)), outputs;
+                    runLayer(layerParams, inputs, outputs);
+                    constBlobs.insert(std::make_pair(layerParams.name, outputs[0]));
                     continue;
                 }
-                layerParams.set("dim", DictValue::arrayInt<int*>(
-                            blob.ptr<int>(), blob.total() ));
             }
             else {
                 DictValue shape = layerParams.get("shape");
@@ -749,8 +751,7 @@ void ONNXImporter::populateNet(Net dstNet)
                 {
                     inputs[i] = getBlob(node_proto, constBlobs, i);
                 }
-                Ptr<Layer> concat = ConcatLayer::create(layerParams);
-                runLayer(concat, inputs, concatenated);
+                runLayer(layerParams, inputs, concatenated);
 
                 CV_Assert(concatenated.size() == 1);
                 constBlobs.insert(std::make_pair(layerParams.name, concatenated[0]));