# MMoRWaD Official Splits — Properties

Brand-disjoint object-level split (MILP, HiGHS).
Validation size bounds: 65-79 objects, test size bounds: 65-79 objects.

## Per-split object and sample counts

| Split | Objects | Samples |
|-------|---------|---------|
| train | 570 | 2583 |
| val | 75 | 357 |
| test | 76 | 360 |
| **Total** | **721** | **3300** |

## Object distribution by broad material category

| Category | Train | Val | Test | Total |
|----------|-------|-----|------|-------|
| Composite | 29 | 4 | 5 | 38 |
| Glass | 24 | 4 | 5 | 33 |
| Metal | 75 | 10 | 8 | 93 |
| Paper | 108 | 15 | 15 | 138 |
| Plastic | 334 | 42 | 43 | 419 |

## Object distribution by fine-grained material

| Material | Train | Val | Test | Total |
|----------|-------|-----|------|-------|
| Aluminium (ALU) | 56 | 7 | 6 | 69 |
| Brown Glass (GL) | 8 | 1 | 1 | 10 |
| Cardboard (PAP) | 10 | 2 | 2 | 14 |
| Clear Glass (GL) | 16 | 2 | 3 | 21 |
| Green Glass (GL) | 0 | 1 | 1 | 2 |
| High Density Polyethylene (HDPE) | 84 | 10 | 11 | 105 |
| Low Density Polyethylene (LDPE) | 11 | 1 | 2 | 14 |
| Other Plastic (Other) | 20 | 3 | 3 | 26 |
| Paper (PAP) | 10 | 2 | 2 | 14 |
| Paper/Cardboard + Plastic (C/PAP) | 11 | 1 | 2 | 14 |
| Paper/Cardboard + Plastic + Aluminum (C/PAP) | 13 | 2 | 2 | 17 |
| Paperboard (PAP) | 88 | 11 | 11 | 110 |
| Plastic + Aluminium (C/PE) | 5 | 1 | 1 | 7 |
| Polyethylene Terephthalate (PET) | 91 | 12 | 11 | 114 |
| Polypropylene (PP) | 121 | 15 | 15 | 151 |
| Polystyrene (PS) | 5 | 1 | 1 | 7 |
| Polyvinyl Chloride (PVC) | 2 | 0 | 0 | 2 |
| Steel (FE) | 19 | 3 | 2 | 24 |

## Verification

- Objects: 721 (item-count log: 721)
- Samples: 3300 (dataset.csv: 3300)
- No object spans more than one split (enforced by construction).
- No brand spans more than one split (enforced by construction).