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README.md

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+---
+license: cc-by-4.0
+task_categories:
+  - visual-question-answering
+  - object-detection
+tags:
+  - coco
+  - grounding
+  - visual-reasoning
+---
+
+# RefStuff
+
+This release contains two COCO 2014-derived splits for visual grounding with
+reference-style horizontal rows of repeated non-person objects.
+
+## Layout
+
+- `coco2014_candidates_4to8_unfiltered/`: 15,577 candidate images.  Each has
+  one selected non-person COCO category with 4-8 annotated instances.
+- `strict_ready_131/`: 131 visually screened samples with complete grounding
+  annotations.  Every item passed whole-image row screening and individual
+  crop validation.
+
+## Strict grounding format
+
+`strict_ready_131/grounding.jsonl` is the final annotation file.  Each record
+includes the source image, target category, COCO instance IDs, visual row
+assignment, crop checks, and per-instance Chinese reference text.  Reference
+text follows this form:
+
+`从上到下第N行从左数第K个<category>`
+
+or:
+
+`从上到下第N行从右数第K个<category>`
+
+Rows are numbered from top to bottom.  The left/right ordinal is selected for
+each instance according to its side of the assigned horizontal row.
+
+## Provenance
+
+Images and instance metadata originate from COCO 2014.  The unfiltered split
+is a candidate pool, not a final-quality row dataset.  The strict split is the
+screened subset intended for grounding use.

coco2014_candidates_4to8_unfiltered/summary.md

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+# RefCOCO Non-Person Grounding Subset: Stage 1
+
+- Selected metadata records: 15,577
+- Successfully downloaded images: 15,577
+- Image download failures: 0
+- Counting rule: COCO non-person, non-crowd annotations with width and height >= 16 px and area >= max(512 px^2, 0.1% of image area).
+- `instances` includes all non-person COCO annotations; `eligible_for_count` identifies the stricter counted instances.
+- Layout hints are geometric, annotation-derived prelabels only; visual-language verification is intentionally deferred to the Qwen stage.
+
+## Reference Inputs
+
+- refcoco: 142,210 source reference expressions
+- refcoco+: 141,564 source reference expressions
+- refcocog: 95,010 source reference expressions
+
+## Non-Person Instance Count Distribution
+
+| Count | Images |
+|---:|---:|
+| 4 | 1,680 |
+| 5 | 1,958 |
+| 6 | 2,198 |
+| 7 | 1,967 |
+| 8 | 1,842 |
+| 9 | 1,387 |
+| 10 | 984 |
+| 11 | 802 |
+| 12 | 590 |
+| 13 | 446 |
+| 14 | 353 |
+| 15 | 266 |
+| 16 | 226 |
+| 17 | 199 |
+| 18 | 155 |
+| 19 | 136 |
+| 20 | 93 |
+| 21 | 75 |
+| 22 | 52 |
+| 23 | 41 |
+| 24 | 27 |
+| 25 | 23 |
+| 26 | 16 |
+| 27 | 17 |
+| 28 | 12 |
+| 29 | 10 |
+| 30 | 4 |
+| 31 | 5 |
+| 32 | 4 |
+| 33 | 2 |
+| 34 | 2 |
+| 35 | 1 |
+| 36 | 1 |
+| 37 | 1 |
+| 39 | 1 |
+| 41 | 1 |
+
+## Category Distribution
+
+| Category | Counted instances |
+|---|---:|
+| chair | 12,829 |
+| car | 10,486 |
+| cup | 5,853 |
+| bottle | 5,763 |
+| bowl | 5,356 |
+| dining table | 5,120 |
+| book | 3,984 |
+| broccoli | 3,507 |
+| carrot | 3,283 |
+| umbrella | 3,099 |
+| banana | 2,971 |
+| wine glass | 2,773 |
+| motorcycle | 2,683 |
+| cow | 2,569 |
+| potted plant | 2,553 |
+| boat | 2,488 |
+| truck | 2,486 |
+| sheep | 2,418 |
+| orange | 2,154 |
+| apple | 2,058 |
+| donut | 1,976 |
+| cake | 1,901 |
+| suitcase | 1,887 |
+| handbag | 1,869 |
+| horse | 1,844 |
+| elephant | 1,758 |
+| pizza | 1,737 |
+| bicycle | 1,729 |
+| bench | 1,720 |
+| zebra | 1,695 |
+| bird | 1,432 |
+| backpack | 1,431 |
+| vase | 1,405 |
+| bus | 1,356 |
+| traffic light | 1,314 |
+| sandwich | 1,289 |
+| giraffe | 1,281 |
+| teddy bear | 1,225 |
+| laptop | 1,143 |
+| tv | 1,129 |
+| knife | 1,117 |
+| spoon | 1,012 |
+| kite | 1,002 |
+| airplane | 952 |
+| fork | 942 |
+| couch | 892 |
+| hot dog | 747 |
+| surfboard | 686 |
+| dog | 633 |
+| clock | 582 |
+| oven | 541 |
+| sink | 506 |
+| tennis racket | 494 |
+| refrigerator | 487 |
+| cell phone | 478 |
+| skateboard | 467 |
+| toilet | 447 |
+| skis | 433 |
+| keyboard | 415 |
+| tie | 413 |
+| train | 380 |
+| cat | 372 |
+| remote | 330 |
+| bed | 278 |
+| microwave | 227 |
+| snowboard | 209 |
+| fire hydrant | 202 |
+| baseball bat | 201 |
+| parking meter | 195 |
+| toothbrush | 191 |
+| scissors | 191 |
+| mouse | 190 |
+| stop sign | 177 |
+| sports ball | 159 |
+| baseball glove | 157 |
+| frisbee | 146 |
+| toaster | 48 |
+| bear | 40 |
+| hair drier | 9 |
+
+## Source Dataset Coverage
+
+| Source | Images |
+|---|---:|
+| coco2014 | 9,535 |
+| refcoco | 4,545 |
+| refcoco+ | 4,544 |
+| refcocog | 4,021 |
+
+## Layout Hints
+
+| Hint | Images |
+|---|---:|
+| grid | 3,231 |
+| mixed | 5,117 |
+| multi_row | 4,535 |
+| single_row | 2,694 |

strict_ready_131/image_paths.txt

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strict_ready_131/sample_ids.txt

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