Use a chessboard to test VLM spatial accuracy
Getting exact structure from a VLM is harder than it may seem when the output needs coordinates, layout, or object positions. A chessboard is a useful quick test because each board position has one exact FEN answer.
Many models can identify the chess pieces but still place them on the wrong squares when writing the FEN. That means visual recognition and precise are separate skills.
Comparing only s can be misleading because the prompt, sampling settings, and scoring method can change the result more than the model choice. VideoDB Labs released an for this kind of test.
Key points
- A VLM may recognize objects but fail to output their exact positions.
- Chessboards are useful because the correct answer can be checked exactly with FEN.
- Prompt, sampling, and scoring choices can change results a lot.
- Testing the full setup may be more useful than comparing s alone.
- VideoDB Labs made an for this problem.