povl-opd-scale05

What this checkpoint is

On-policy distillation. The weight delta learned by the teacher was merged into the SFT base with an extra scale of 0.5, the best point of an alpha sweep (0.25 -> +0.32, 0.5 -> +0.44, 0.75 -> -0.29, 1.5 -> -3.01 with t = -12.42).

Lineage

Fine-tuned from CheneyWong/povl-sft-2d-merge, which is NOT the RL checkpoint -- the teacher delta was merged into the SFT base, which is why it neither clearly beats nor clearly follows round 2.

PaddleOCR-VL-1.6 (base)
  โ””โ”€ povl-opd-scale05   <-- this checkpoint

Results on public datasets

Base = the unmodified base model. Public datasets only; the project's self-built benchmarks are excluded.

Dataset n Base TEDS Ours TEDS d TEDS Base TEDS-S Ours TEDS-S d TEDS-S
PubTables-1M 2000 0.9015 0.9276 +0.0261 0.9243 0.9377 +0.0133
PubTables-v2 2000 0.9026 0.9499 +0.0473 0.9239 0.9592 +0.0353
FinTabNet (OTSL) 2000 0.9442 0.9660 +0.0217 0.9524 0.9734 +0.0209
PubTabNet / ICDAR 2000 0.9297 0.9296 -0.0001 0.9464 0.9426 -0.0038
SynthTabNet 2000 0.8093 0.9144 +0.1051 0.8474 0.9283 +0.0809
TableVerse-5K 4951 0.8608 0.8509 -0.0099 0.9101 0.9026 -0.0074
OmniDocBench v1.5 512 0.9580 0.9449 -0.0131 0.9797 0.9722 -0.0075
OmniDocBench v1.6 665 0.9492 0.9344 -0.0148 0.9753 0.9666 -0.0086
CC-OCR 300 0.8304 0.8048 -0.0256 0.8762 0.8552 -0.0210
OCRBench-v2 681 0.8120 0.8069 -0.0051 0.8526 0.8456 -0.0070
Real5 (re-shot OmniDoc) 1320 0.8930 0.8738 -0.0192 0.9307 0.9118 -0.0189
SPRINT-MUSTARD 1429 0.2184 0.2203 +0.0019 0.8754 0.8689 -0.0065
TABLET 909 0.9048 0.8924 -0.0123 0.9277 0.9136 -0.0141
Overall (equal weight) - 0.8395 0.8474 +0.0078 0.9171 0.9214 +0.0043

Note on SPRINT-MUSTARD: its ground truth carries no cell text, so its TEDS (~0.22 here) measures how well the model reproduces empty cells and should be ignored -- a perturbation test shows a structurally perfect prediction that correctly reads the visible text scores 0.33 TEDS / 1.00 TEDS-S. Only the TEDS-S column is meaningful for that dataset.

Known limitations

The +0.05 pt over the RL checkpoint is inside sampling noise (+/- 0.5 pt) and is not a real gain. It was also bought by giving up 4.4 pt in-domain: the distillation delta behaves as a slider trading in-domain accuracy against real-scene accuracy, not as a free improvement.

Separately, an audit found that all eight on-policy distillation students from the previous round were no-ops (mean_r pinned at exactly -1.0000) because a reward-bridge fix never reached the plugin that actually ran. On-policy distillation has therefore never actually been validated in this project.


Task format: a single table image plus the prompt Table Recognition:, one pass, emitting OTSL markup (<fcel> <ecel> <ucel> <lcel> <xcel> <nl>). Evaluation numbers are tracked separately and are not part of this card.

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