保存模型前，主动删除旧的模型文件

	修改：     SigerCalculation/RadomForestSAC/RandomForestClassifier.cpp
	修改：     SigerCalculation/package/E3/SigerCalculation

SigerCalculation/RadomForestSAC/RandomForestClassifier.cpp

@@ -201,8 +201,9 @@ bool RandomForestClassifier::train(const std::vector<std::vector<float>>& X, con
     try
     {
         std::string filename = (!m_target.empty()) ? (m_target + "_rf_model.dat") : "rf_model.dat";
+        unlink(filename.c_str());
         serialize(filename) << scaler_mean << scaler_std << forest;
-        SPDLOG_LOGGER_DEBUG(spdlog::get("logger"), "save {} success", filename.c_str());
+        //SPDLOG_LOGGER_DEBUG(spdlog::get("logger"), "save {} success", filename.c_str());
     }
     catch(std::exception &e) {
         SPDLOG_LOGGER_DEBUG(spdlog::get("logger"), "load model failure: {}", e.what());