fixed some IO bugs

include/LightGBM/utils/text_reader.h

@@ -34,6 +34,9 @@ public:
 #else
       file = fopen(filename, "r");
 #endif
+      if (file == NULL) {
+        Log::Fatal("failed to open file %s", filename);
+      }
       std::stringstream str_buf;
       int read_c = -1;
       read_c = fgetc(file);

src/io/metadata.cpp

@@ -310,7 +310,7 @@ void Metadata::LoadFromMemory(const void* memory) {
   if (label_ != nullptr) { delete[] label_; }
   label_ = new float[num_data_];
   std::memcpy(label_, mem_ptr, sizeof(float)*num_data_);
-  mem_ptr += sizeof(float)*num_weights_;
+  mem_ptr += sizeof(float)*num_data_;
 
   if (num_weights_ > 0) {
     if (weights_ != nullptr) { delete[] weights_; }