Datasets:
| (A) | |
| - Stack with purple block | |
| - Stack with blue block | |
| - Stack with orange block, yellow block, green block, from bottom to top | |
| (B) | |
| - Stack with orange block | |
| - Stack with green block | |
| - Stack with red block | |
| - Stack with purple block | |
| (C) | |
| - Stack with red block | |
| - Stack with orange block, green block, purple block, from bottom to top | |
| (D) | |
| - Stack with yellow block | |
| - Stack with orange block | |
| - Stack with green block | |