turns out you need using::isnan too

diff --git a/include/caffe/common.hpp b/include/caffe/common.hpp
index 58f500d..789b3db 100644 (file)
--- a/include/caffe/common.hpp
+++ b/include/caffe/common.hpp
@@ -81,6 +81,7 @@ using std::pair;
 using std::set;
 using std::string;
 using std::vector;
+using std::isnan;
 
 // A global initialization function that you should call in your main function.
 // Currently it initializes google flags and google logging.