▲ Interactive · the tracing half of the task
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Trace it yourself
Grounding asks a model to find the referent and then trace it. Here the referent is already given to you — this is only the second half, and it is still hard. Place exactly N vertices around the shaded region. Your contour is rasterised and scored against the canonical exact-N target by the same policy the benchmark uses.
uid 0417 · “the zebra behind the fence”
8 vertices remainingclick to place
Referent
Budget
Referent region
Canonical target GN
Your polygon
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IoU × 100 vs GN
Place all N vertices to score. Start point and direction are free — filled-mask IoU is invariant to cyclic shift and reversal.
exact length
simple polygon
positive area
distinct vertices
You vs the hosted configurations at this budget
▸ Model scores are the paper's fixed-denominator IoU² over 1,500 real RefCOCO-family questions. Yours is one synthetic contour with the referent already revealed — a generous comparison, and the point of the exercise.
response · 2N integers
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