ResearchResearch paperLarge Language Models1 source · Oct 20, 2026

Corpus Quality Improves, Retrieval Utility Does Not: An Ablation of Preprocessing and Refinement in a Speech-to-QA Pipeline

Practitioners building training corpora with a pipeline of language models keep a preprocessing or refinement (post-process) stage when switching it on raises the corpus quality.

Key points

  • We ablate a production pipeline that turns conference speech into question-answer pairs.
  • We supply each corpus to six models at inference and measure retrieval accuracy.
  • Enabling the transcript rewrite lowers retrieval accuracy by 0.061, the only stage effect that survives correction for multiple comparisons.
  • On our data, the null does not come from weak corpora.

Sources (1)

Extractive summary: sentences quoted from the sources.

Before this

  1. Oct 19, 2026Target-Aware Curation of Hallucination Stress Tests for Large Language Models
  2. Oct 19, 2026Balance-Aware Pivot Selection for Parallel Diffusion LLM Decoding
  3. Oct 19, 2026Keep the Lineages Alive: Diversity-Preserving SMC for Diffusion LLM Decoding
  4. Oct 19, 2026Bayesian Model Discovery with Language Models: Closing the Loop between Hypotheses and Experiments
  5. Oct 18, 2026Explore or Confirm? LLM Agents Misallocate Measurements Under Noise
  6. Oct 17, 2026Bellman Language Models: Solving the Recurring Decisions of LLM Agents

Related