ViperEkura e6be33aa53 doc: add SFT length-filter rationale — high PPL + high variance from A.3 IFD figure
- Add 15-token length floor to SFT samples, with explicit reference
  to Appendix A.3 / Figure 5 (ifd_length_grid)
- Short replies (<10 tokens) show both high per-token perplexity
  (L_uncond ~6-8, PPL ~400-3000 vs long replies ~2-3, PPL ~7-20)
  and wide variance in L_cond (span 0-17.5), which distorts
  downstream IFD-based difficulty estimates.
2026-07-24 06:37:35 +08:00
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