refine model error

[Bin-ze]

I tried fine-tuning from a known colmap model:

  echo "hloc extract_features"
  echo "+++++++++++++++++++++++++++++++++++++++++"
  python -m hloc.extract_features --image_dir $image_dir --feature_path $feature_path --export_dir $export_dir
  
  # echo "colmap model_converter"
  # echo "+++++++++++++++++++++++++++++++++++++++++"
  # colmap model_converter --input_path $colmap_ref_model --output_path $colmap_convert_model --output_type BIN
  
  echo "hloc pairs_from_poses"
  echo "+++++++++++++++++++++++++++++++++++++++++"
  python -m hloc.pairs_from_poses --output $hloc_pairs_path --model  $colmap_convert_model --num_matched 10
  
  echo "hloc match_features"
  echo "+++++++++++++++++++++++++++++++++++++++++"
  python -m hloc.match_features --pairs $hloc_pairs_path --export_dir $export_dir
  
  echo "pixsfm refine_hloc triangulator"
  echo "+++++++++++++++++++++++++++++++++++++++++"
  python -m pixsfm.refine_hloc triangulator --sfm_dir $triangulator_dir --image_dir $image_dir --pairs_path $hloc_pairs_path --features_path $export_dir/feats-superpoint-n4096-r1024.h5 --matches_path $export_dir/feats-superpoint-n4096-r1024_matches-superglue_pairs.h5 --reference_sfm_model $colmap_convert_model --config default
  
   # BA
  echo "pixsfm.refine_colmap bundle_adjuster"
  python -m pixsfm.refine_colmap ba --input_path $triangulator_model_dir --output_path $refine_model_dir --image_dir $image_dir --config default

But ba has a cost of -nan and exits quickly：

This phenomenon happens occasionally, how can I prevent such problems?