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Building a Vertical Corpus Builder: Clean JSONL Datasets for LLM Fine-Tuning

Raw web pages are terrible training data. Nav bars, cookie banners, "related articles" and ads drown the signal, and near-identical syndicated text pollutes the corpus.

  • Pipeline transforms seed URLs into token-aware JSONL dataset
  • Boilerplate removal and near-duplicate deduplication included
  • Legal domain dataset contains 443 chunks with 173,000 tokens

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