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Tracing Text Provenance via Context-Aware Lexical Substitution

AAAI 2022 · Large language models › Language, safety and interpretability · approach: Text watermarking · 51 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
rank BERT-generated lexical substitutes using inference-based semantic relatednessBERT lexical substitution · SWORDSF^10: 31.6 -> 36.7 (Lenient); 16.8 -> 18.3 (Strict)Helped
rank BERT-generated lexical substitutes using inference-based semantic relatednessBERT lexical substitution · SWORDSF_c^10: 53.3 -> 56.1 (Lenient); 26.1 -> 28.7 (Strict)Helped
use context-aware lexical substitution with synchronicity and substitutability testsText watermarking · Watermarking datasetsSR: Proposed SR: 0.9844, 0.9852, 0.9854, 0.9864, 0.9850, 0.9763; baseline results vary by datasetHelped
use context-aware lexical substitution with synchronicity and substitutability testsText watermarking · Human evaluationmeaning-preservation rating: 2.8\pm1.3, 2.4\pm1.0, 2.0\pm1.2 -> 4.5 \pm0.6Helped
remove the synchronicity test (ablation)Sequence incremental watermarking · Watermark extractionsuccessful watermark extractionHurt
remove the substitutability test (ablation)Sequence incremental watermarking · Watermark extractioncorrect word locationHurt
increase minimum substitution distance f from 1 to 2 (ablation)Sequence incremental watermarking · Watermarkingpayload (bpw): 0.091 -> 0.044Hurt
increase minimum substitution distance f from 1 to 3 (ablation)Sequence incremental watermarking · Watermarkingpayload (bpw): 0.091 -> 0.031Hurt
increase minimum substitution distance f from 1 to 3 (ablation)Sequence incremental watermarking · WatermarkingSR: 0.983 -> 0.985No clear effect
increase minimum substitution distance f from 1 to 3 (ablation)Sequence incremental watermarking · WatermarkingSS: 0.988 -> 0.995No clear effect

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