Updated mlperf_logging to be compliant with new H2 logger format

Author: graham63

include/lbann/callbacks/mlperf_logging.hpp

@@ -131,11 +131,10 @@ class mlperf_logging : public callback_base {
   std::string m_sub_division;
   std::string m_sub_status;
   std::string m_sub_platform;
-  //FIXME: Include option to create separate file with just logging data?
   /* @brief name of output file. Default = results.txt */
   //std::string m_output_filename;
   /* @brief DiHydrogen logger */
-  h2::Logger m_logger{":::MLLOG"};
+  h2::Logger m_logger{"mlperf_logger", "stdout", ":::MLLOG"};
 
 
 }; // class mlperf_logging

src/callbacks/mlperf_logging.cpp

@@ -44,6 +44,7 @@ namespace lbann {
 namespace callback {
 
 namespace {
+
 void print_value(std::ostringstream& os, int value)
 {
   os << value;
@@ -116,7 +117,7 @@ void mlperf_logging::print(std::ostringstream& os,
   else
     os << ", " << "\"epoch_num\": " << epoch << "}}";
 
-  H2_INFO(os.str());
+  m_logger.get()->info(os.str());
   os.flush();
 }