Fixed output of time_remaining for multi-GPU

src/detector.c

@@ -348,7 +348,7 @@ void train_detector(char *datacfg, char *cfgfile, char *weightfile, int *gpus, i
 
             draw_precision = 1;
         }
-        time_remaining = (net.max_batches - iteration)*(what_time_is_it_now() - time + load_time) / 60 / 60;
+        time_remaining = ((net.max_batches - iteration) / ngpus)*(what_time_is_it_now() - time + load_time) / 60 / 60;
         // set initial value, even if resume training from 10000 iteration
         if (avg_time < 0) avg_time = time_remaining;
         else avg_time = alpha_time * time_remaining + (1 -  alpha_time) * avg_time;