keep the minimum_num to be consistent with COLMAP

Author: lpanaf

glomap/estimators/bundle_adjustment.h

@@ -19,7 +19,7 @@ struct BundleAdjusterOptions : public OptimizationBaseOptions {
 
   bool use_gpu = true;
   std::string gpu_index = "-1";
-  int min_num_images_gpu_solver = 300;
+  int min_num_images_gpu_solver = 50;
 
   // Constrain the minimum number of views per track
   int min_num_view_per_track = 3;

glomap/estimators/global_positioning.h

@@ -31,7 +31,7 @@ struct GlobalPositionerOptions : public OptimizationBaseOptions {
 
   bool use_gpu = true;
   std::string gpu_index = "-1";
-  int min_num_images_gpu_solver = 1000;
+  int min_num_images_gpu_solver = 50;
 
   // Constrain the minimum number of views per track
   int min_num_view_per_track = 3;