fix one bug in 4bits_bin .

src/io/dataset_loader.cpp

@@ -747,6 +747,9 @@ void DatasetLoader::ConstructBinMappersFromTextData(int rank, int num_machines,
     // find local feature bins and copy to buffer
 #pragma omp parallel for schedule(guided)
     for (int i = 0; i < len[rank]; ++i) {
+      if (ignore_features_.count(start[rank] + i) > 0) {
+        continue;
+      }
       BinType bin_type = BinType::NumericalBin;
       if (categorical_features_.count(start[rank] + i)) {
         bin_type = BinType::CategoricalBin;

src/io/dense_nbits_bin.hpp

@@ -214,6 +214,7 @@ public:
   OrderedBin* CreateOrderedBin() const override { return nullptr; }
 
   void FinishLoad() override {
+    if (buf_.empty()) { return; }
     int len = (num_data_ + 1) / 2;
     for (int i = 0; i < len; ++i) {
       data_[i] |= buf_[i];