feat: use DTO for NCNN init parameters

src/apidata.h

@@ -38,6 +38,7 @@
 #include <vector>
 #include <sstream>
 #include <typeinfo>
+#include "oatpp/parser/json/mapping/ObjectMapper.hpp"
 
 namespace dd
 {
@@ -288,6 +289,31 @@ namespace dd
      */
     void toJDoc(JDoc &jd) const;
 
+    /**
+     * \brief converts APIData to oat++ DTO
+     */
+    template <typename T> inline std::shared_ptr<T> createSharedDTO() const
+    {
+      rapidjson::Document d;
+      d.SetObject();
+      toJDoc(reinterpret_cast<JDoc &>(d));
+
+      rapidjson::StringBuffer buffer;
+      rapidjson::Writer<rapidjson::StringBuffer, rapidjson::UTF8<>,
+                        rapidjson::UTF8<>, rapidjson::CrtAllocator,
+                        rapidjson::kWriteNanAndInfFlag>
+          writer(buffer);
+      bool done = d.Accept(writer);
+      if (!done)
+        throw DataConversionException("JSON rendering failed");
+
+      std::shared_ptr<oatpp::data::mapping::ObjectMapper> object_mapper
+          = oatpp::parser::json::mapping::ObjectMapper::createShared();
+      return object_mapper
+          ->readFromString<oatpp::Object<T>>(buffer.GetString())
+          .getPtr();
+    }
+
     /**
      * \brief converts APIData to rapidjson JSON value
      * @param jd JSON Document hosting the destination JSON value

src/backends/ncnn/ncnnlib.cc

@@ -22,7 +22,6 @@
 #include "outputconnectorstrategy.h"
 #include <thread>
 #include <algorithm>
-#include "utils/utils.hpp"
 
 // NCNN
 #include "ncnnlib.h"
@@ -53,10 +52,10 @@ namespace dd
   {
     this->_libname = "ncnn";
     _net = new ncnn::Net();
-    _net->opt.num_threads = _threads;
+    _net->opt.num_threads = 1;
     _net->opt.blob_allocator = &_blob_pool_allocator;
     _net->opt.workspace_allocator = &_workspace_pool_allocator;
-    _net->opt.lightmode = _lightmode;
+    _net->opt.lightmode = true;
   }
 
   template <class TInputConnectorStrategy, class TOutputConnectorStrategy,
@@ -69,12 +68,9 @@ namespace dd
     this->_libname = "ncnn";
     _net = tl._net;
     tl._net = nullptr;
-    _nclasses = tl._nclasses;
-    _threads = tl._threads;
     _timeserie = tl._timeserie;
     _old_height = tl._old_height;
-    _inputBlob = tl._inputBlob;
-    _outputBlob = tl._outputBlob;
+    _init_dto = tl._init_dto;
   }
 
   template <class TInputConnectorStrategy, class TOutputConnectorStrategy,
@@ -94,6 +90,8 @@ namespace dd
   void NCNNLib<TInputConnectorStrategy, TOutputConnectorStrategy,
                TMLModel>::init_mllib(const APIData &ad)
   {
+    _init_dto = ad.createSharedDTO<NcnnInitDto>();
+
     bool use_fp32 = (ad.has("datatype")
                      && ad.get("datatype").get<std::string>()
                             == "fp32"); // default is fp16
@@ -124,35 +122,11 @@ namespace dd
     _old_height = this->_inputc.height();
     _net->set_input_h(_old_height);
 
-    if (ad.has("nclasses"))
-      _nclasses = ad.get("nclasses").get<int>();
-
-    if (ad.has("threads"))
-      _threads = ad.get("threads").get<int>();
-    else
-      _threads = dd_utils::my_hardware_concurrency();
-
     _timeserie = this->_inputc._timeserie;
     if (_timeserie)
       this->_mltype = "timeserie";
 
-    if (ad.has("lightmode"))
-      {
-        _lightmode = ad.get("lightmode").get<bool>();
-        _net->opt.lightmode = _lightmode;
-      }
-
-    // setting the value of Input Layer
-    if (ad.has("inputblob"))
-      {
-        _inputBlob = ad.get("inputblob").get<std::string>();
-      }
-    // setting the final Output Layer
-    if (ad.has("outputblob"))
-      {
-        _outputBlob = ad.get("outputblob").get<std::string>();
-      }
-
+    _net->opt.lightmode = _init_dto->lightmode;
     _blob_pool_allocator.set_size_compare_ratio(0.0f);
     _workspace_pool_allocator.set_size_compare_ratio(0.5f);
     model_type(this->_mlmodel._params, this->_mltype);
@@ -213,8 +187,8 @@ namespace dd
 
     ncnn::Extractor ex = _net->create_extractor();
 
-    ex.set_num_threads(_threads);
-    ex.input(_inputBlob.c_str(), inputc._in);
+    ex.set_num_threads(_init_dto->threads);
+    ex.input(_init_dto->inputBlob->c_str(), inputc._in);
 
     APIData ad_output = ad.getobj("parameters").getobj("output");
 
@@ -237,8 +211,7 @@ namespace dd
       }
 
     // Extract detection or classification
-    int ret = 0;
-    std::string out_blob = _outputBlob;
+    std::string out_blob = _init_dto->outputBlob.std_str();
     if (out_blob.empty())
       {
         if (bbox == true)
@@ -250,7 +223,7 @@ namespace dd
         else
           out_blob = "prob";
       }
-    ret = ex.extract(out_blob.c_str(), inputc._out);
+    int ret = ex.extract(out_blob.c_str(), inputc._out);
     if (ret == -1)
       {
         throw MLLibInternalException("NCNN internal error");
@@ -277,8 +250,8 @@ namespace dd
       {
         best = ad_output.get("best").get<int>();
       }
-    if (best == -1 || best > _nclasses)
-      best = _nclasses;
+    if (best == -1 || best > _init_dto->nclasses)
+      best = _init_dto->nclasses;
 
     if (bbox == true)
       {
@@ -408,7 +381,8 @@ namespace dd
 
     vrad.push_back(rad);
     tout.add_results(vrad);
-    out.add("nclasses", this->_nclasses);
+    int nclasses = this->_init_dto->nclasses;
+    out.add("nclasses", nclasses);
     if (bbox == true)
       out.add("bbox", true);
     out.add("roi", false);

src/backends/ncnn/ncnnlib.h

@@ -22,12 +22,15 @@
 #ifndef NCNNLIB_H
 #define NCNNLIB_H
 
+#include "apidata.h"
+#include "utils/utils.hpp"
+
+#include "http/dto/ncnn.hpp"
+
 // NCNN
 #include "net.h"
 #include "ncnnmodel.h"
 
-#include "apidata.h"
-
 namespace dd
 {
   template <class TInputConnectorStrategy, class TOutputConnectorStrategy,
@@ -53,20 +56,17 @@ namespace dd
 
   public:
     ncnn::Net *_net = nullptr;
-    int _nclasses = 0;
     bool _timeserie = false;
-    bool _lightmode = true;
 
   private:
+    std::shared_ptr<NcnnInitDto> _init_dto;
     static ncnn::UnlockedPoolAllocator _blob_pool_allocator;
     static ncnn::PoolAllocator _workspace_pool_allocator;
 
   protected:
-    int _threads = 1;
     int _old_height = -1;
-    std::string _inputBlob = "data";
-    std::string _outputBlob;
   };
+
 }
 
 #endif

src/http/dto/ncnn.hpp

@@ -0,0 +1,71 @@
+/**
+ * DeepDetect
+ * Copyright (c) 2021 Jolibrain SASU
+ * Author: Mehdi Abaakouk <mehdi.abaakouk@jolibrain.com>
+ *
+ * This file is part of deepdetect.
+ *
+ * deepdetect is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * deepdetect is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with deepdetect.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef HTTP_DTO_NCNN_H
+#define HTTP_DTO_NCNN_H
+
+#include "dd_config.h"
+#include "oatpp/core/Types.hpp"
+#include "oatpp/core/macro/codegen.hpp"
+
+#include OATPP_CODEGEN_BEGIN(DTO) ///< Begin DTO codegen section
+
+class NcnnInitDto : public oatpp::DTO
+{
+  DTO_INIT(NcnnInitDto, DTO /* extends */)
+
+  DTO_FIELD_INFO(nclasses)
+  {
+    info->description = "number of output classes (`supervised` service "
+                        "type), classification only";
+  };
+  DTO_FIELD(Int32, nclasses) = 0;
+
+  DTO_FIELD_INFO(threads)
+  {
+    info->description = "number of threads";
+  };
+  DTO_FIELD(Int32, threads) = dd::dd_utils::my_hardware_concurrency();
+
+  DTO_FIELD_INFO(lightmode)
+  {
+    info->description = "enable light mode";
+  };
+  DTO_FIELD(Boolean, lightmode) = true;
+
+  DTO_FIELD_INFO(inputBlob)
+  {
+    info->description = "network input blob name";
+  };
+  DTO_FIELD(String, inputBlob) = "data";
+
+  DTO_FIELD_INFO(outputBlob)
+  {
+    info->description = "network output blob name (default depends on "
+                        "network type(ie prob or "
+                        "rnn_pred or probs or detection_out)";
+  };
+  DTO_FIELD(String, outputBlob);
+};
+
+#include OATPP_CODEGEN_END(DTO) ///< End DTO codegen section
+
+#endif