Added include

Signed-off-by: Shintaro Sakoda <sakoda@keio.jp>

Author: SakodaShintaro

localization/nerf_based_localizer/src/nerf/dataset.cpp

@@ -27,6 +27,7 @@
 #include <fmt/core.h>
 #include <glob.h>
 
+#include <fstream>
 #include <iostream>
 
 using Tensor = torch::Tensor;