fix test_nsg failed bug

core/src/db/engine/ExecutionEngineImpl.cpp

@@ -611,6 +611,9 @@ ExecutionEngineImpl::Init() {
     server::Config& config = server::Config::GetInstance();
     std::vector<int64_t> gpu_ids;
     Status s = config.GetGpuResourceConfigBuildIndexResources(gpu_ids);
+    if (!s.ok()) {
+        gpu_num_ = knowhere::INVALID_VALUE;
+    }
     for (auto id : gpu_ids) {
         if (gpu_num_ == id) {
             return Status::OK();

core/src/index/knowhere/knowhere/index/vector_index/IndexNSG.cpp

@@ -118,8 +118,7 @@ NSG::Train(const DatasetPtr& dataset, const Config& config) {
     // TODO(linxj): dev IndexFactory, support more IndexType
     Graph knng;
 #ifdef MILVUS_GPU_VERSION
-    auto temp_resource = FaissGpuResourceMgr::GetInstance().GetRes(build_cfg->gpu_id);
-    if (temp_resource == nullptr) {
+    if (build_cfg->gpu_id == knowhere::INVALID_VALUE) {
         auto preprocess_index = std::make_shared<IVF>();
         auto model = preprocess_index->Train(dataset, config);
         preprocess_index->set_index_model(model);

core/src/wrapper/ConfAdapter.cpp

@@ -39,8 +39,6 @@ void
 ConfAdapter::MatchBase(knowhere::Config conf) {
     if (conf->metric_type == knowhere::DEFAULT_TYPE)
         conf->metric_type = knowhere::METRICTYPE::L2;
-    if (conf->gpu_id == knowhere::INVALID_VALUE)
-        conf->gpu_id = 0;
 }
 
 knowhere::Config