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Introduces Speculative Refinement (SpecRef), a training-free hybrid decoding strategy that warm-starts a masked diffusion language model from an autoregressive draft using entropy-guided selective masking. Evaluated across six benchmarks, it reveals that code benchmarks conflate structural discovery with logical correctness, identifies a refinement tension phenomenon, and shows that evaluation protocols can produce different model rankings.
Hybrid-LoRA proposes a framework that selectively applies full fine-tuning to a small subset of modules while using LoRA for the rest, achieving performance near full fine-tuning with significantly lower computational cost. Experiments show improvements of up to 5.65% over existing parameter-efficient baselines.