Baseline for the ArgParser series. Full fine-tune of Qwen-0.5B on four argument-mining corpora (AbstRCT, Microtext, CDCP, PERSPECTRUM), 1,494 records total, 3 epochs, fp16, Adafactor. About 1.5 hours on a GTX 1080 Ti.

Held-out component-F1 averaged across the four domains: 0.108. Best on CDCP claim extraction (0.501). Worst on PERSPECTRUM (91% empty rate — the debate-text format defeats extractive parsing here).

This is the smallest useful reference point. Kept up mostly for reproducibility of the ablation series. If you want to actually use one of these, use ArgParser-v4 — same repo family, gets a real Phase 1 integration F1 of 0.217 versus this baseline's near-zero usefulness on that task.

Apache 2.0.