fix name of tensor from StringToTensor

mindspore/lite/src/cxx_api/model/model.cc

@@ -23,6 +23,10 @@
 namespace mindspore {
 
 Status Model::Build(GraphCell graph, const std::shared_ptr<Context> &model_context) {
+  if (impl_ != nullptr) {
+    MS_LOG(DEBUG) << "Model has been already built.";
+    return kSuccess;
+  }
   impl_ = std::shared_ptr<ModelImpl>(new (std::nothrow) ModelImpl());
   if (impl_ == nullptr) {
     MS_LOG(ERROR) << "Model implement is null.";

mindspore/lite/src/cxx_api/model/model_impl.cc

@@ -37,10 +37,6 @@ using mindspore::lite::RET_OK;
 
 Status ModelImpl::Build() {
   MS_LOG(DEBUG) << "Start build model.";
-  if (session_ != nullptr) {
-    MS_LOG(DEBUG) << "Model has been already built.";
-    return kSuccess;
-  }
   auto model = graph_->graph_data_->lite_model();
   if (graph_ == nullptr || graph_->graph_data_ == nullptr || model == nullptr) {
     MS_LOG(ERROR) << "Invalid graph.";

mindspore/lite/src/cxx_api/tensor/tensor_impl.cc

@@ -67,14 +67,14 @@ MSTensor::Impl *MSTensor::Impl::StringsToTensorImpl(const std::string &name, con
     delete lite_tensor;
     return nullptr;
   }
-  auto impl = new (std::nothrow) Impl();
+  auto impl = new (std::nothrow) Impl(lite_tensor);
   if (impl == nullptr) {
     delete lite_tensor;
     MS_LOG(ERROR) << "Failed to allocate tensor impl.";
     return nullptr;
   }
-  impl->set_lite_tensor(lite_tensor);
   impl->set_own_data(true);
+  impl->set_from_session(false);
   return impl;
 }