Throw error if given pretrained word embeddings file don't exist

torch_modules/src/Submodule.cpp

@@ -7,9 +7,12 @@ void Submodule::setFirstInputIndex(std::size_t firstInputIndex)
 
 void Submodule::loadPretrainedW2vEmbeddings(torch::nn::Embedding & embeddings, std::filesystem::path path)
 {
-  if (!std::filesystem::exists(path))
+  if (path.empty())
     return;
 
+  if (!std::filesystem::exists(path))
+    util::myThrow(fmt::format("pretrained word2vec file '{}' do not exist", path.string()));
+
   torch::NoGradGuard no_grad;
 
   auto originalState = getDict().getState();