fix ut

mindspore/ccsrc/minddata/dataset/api/datasets.cc

@@ -991,16 +991,24 @@ MindDataDataset::MindDataDataset(const std::vector<char> &dataset_file,
                                  const std::shared_ptr<Sampler> &sampler, nlohmann::json *padded_sample,
                                  int64_t num_padded) {
   auto sampler_obj = sampler ? sampler->Parse() : nullptr;
+  nlohmann::json sample = nullptr;
+  if (padded_sample) {
+    sample = *padded_sample;
+  };
   auto ds = std::make_shared<MindDataNode>(CharToString(dataset_file), VectorCharToString(columns_list), sampler_obj,
-                                           *padded_sample, num_padded);
+                                           sample, num_padded);
   ir_node_ = std::static_pointer_cast<DatasetNode>(ds);
 }
 MindDataDataset::MindDataDataset(const std::vector<char> &dataset_file,
                                  const std::vector<std::vector<char>> &columns_list, Sampler *sampler,
                                  nlohmann::json *padded_sample, int64_t num_padded) {
   auto sampler_obj = sampler ? sampler->Parse() : nullptr;
+  nlohmann::json sample = nullptr;
+  if (padded_sample) {
+    sample = *padded_sample;
+  };
   auto ds = std::make_shared<MindDataNode>(CharToString(dataset_file), VectorCharToString(columns_list), sampler_obj,
-                                           *padded_sample, num_padded);
+                                           sample, num_padded);
   ir_node_ = std::static_pointer_cast<DatasetNode>(ds);
 }
 MindDataDataset::MindDataDataset(const std::vector<char> &dataset_file,
@@ -1008,8 +1016,13 @@ MindDataDataset::MindDataDataset(const std::vector<char> &dataset_file,
                                  const std::reference_wrapper<Sampler> sampler, nlohmann::json *padded_sample,
                                  int64_t num_padded) {
   auto sampler_obj = sampler.get().Parse();
+  nlohmann::json sample = nullptr;
+  if (padded_sample) {
+    sample = *padded_sample;
+  };
+
   auto ds = std::make_shared<MindDataNode>(CharToString(dataset_file), VectorCharToString(columns_list), sampler_obj,
-                                           *padded_sample, num_padded);
+                                           sample, num_padded);
   ir_node_ = std::static_pointer_cast<DatasetNode>(ds);
 }
 MindDataDataset::MindDataDataset(const std::vector<std::vector<char>> &dataset_files,
@@ -1017,16 +1030,26 @@ MindDataDataset::MindDataDataset(const std::vector<std::vector<char>> &dataset_f
                                  const std::shared_ptr<Sampler> &sampler, nlohmann::json *padded_sample,
                                  int64_t num_padded) {
   auto sampler_obj = sampler ? sampler->Parse() : nullptr;
+  nlohmann::json sample = nullptr;
+  if (padded_sample) {
+    sample = *padded_sample;
+  };
+
   auto ds = std::make_shared<MindDataNode>(VectorCharToString(dataset_files), VectorCharToString(columns_list),
-                                           sampler_obj, *padded_sample, num_padded);
+                                           sampler_obj, sample, num_padded);
   ir_node_ = std::static_pointer_cast<DatasetNode>(ds);
 }
 MindDataDataset::MindDataDataset(const std::vector<std::vector<char>> &dataset_files,
                                  const std::vector<std::vector<char>> &columns_list, Sampler *sampler,
                                  nlohmann::json *padded_sample, int64_t num_padded) {
   auto sampler_obj = sampler ? sampler->Parse() : nullptr;
+  nlohmann::json sample = nullptr;
+  if (padded_sample) {
+    sample = *padded_sample;
+  };
+
   auto ds = std::make_shared<MindDataNode>(VectorCharToString(dataset_files), VectorCharToString(columns_list),
-                                           sampler_obj, *padded_sample, num_padded);
+                                           sampler_obj, sample, num_padded);
   ir_node_ = std::static_pointer_cast<DatasetNode>(ds);
 }
 MindDataDataset::MindDataDataset(const std::vector<std::vector<char>> &dataset_files,
@@ -1034,8 +1057,12 @@ MindDataDataset::MindDataDataset(const std::vector<std::vector<char>> &dataset_f
                                  const std::reference_wrapper<Sampler> sampler, nlohmann::json *padded_sample,
                                  int64_t num_padded) {
   auto sampler_obj = sampler.get().Parse();
+  nlohmann::json sample = nullptr;
+  if (padded_sample) {
+    sample = *padded_sample;
+  };
   auto ds = std::make_shared<MindDataNode>(VectorCharToString(dataset_files), VectorCharToString(columns_list),
-                                           sampler_obj, *padded_sample, num_padded);
+                                           sampler_obj, sample, num_padded);
   ir_node_ = std::static_pointer_cast<DatasetNode>(ds);
 }
 #endif