Twin LoRA Lane Separation: One Adapter Per Job or Poison the Model
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Twin LoRA Lane Separation: One Adapter Per Job or Poison the Model

DAJAI Stewart

How we keep twin LoRA adapters from contaminating each other—lane map, privacy routing, prove-before-live, and why base-model match is non-negotiable.

Merging every training run into one "personality adapter" feels efficient. It is how you get a model that half-speaks operator voice, half-leaks NSFW caption grammar into a music brief.

The doctrine

  1. One adapter per lane — never melt private directives with brand captions
  2. Base model match — an 8B LoRA on a 3B base is cosplay
  3. Prove before live — temp-0 base vs adapter must differ; else the file is decoration
  4. Privacy routing — private corpora stay on private GPUs; scrubbed lanes may use free tiers
  5. Artifacts come home — if the zip never leaves Colab/Kaggle, it never existed

Example lane map

| Lane | Content | Train surface | |---|---|---| | dj-twin | operator voice, private directives | private only | | codeblack | historian / lineage | private only | | music | mastering doctrine, lyric pairs | free GPU if scrubbed | | hellcat | NSFW captions | private only | | beats / fulltwin | audio models | free GPU if scrubbed |

Serve path

Training logs are not production. Before anything is marked live:

  • adapter file on home disk
  • local serve path answers
  • lane router selects scale per request (default scale 0)
  • no secrets in train jsonl

Related

FAQ

Can I share one adapter across brands for cost?

You can. You will also share voice contamination across brands. Cost savings are not free.

What's the fastest way to fake a live adapter?

Ship a zip you never pulled home and never proved against base. Don't do that.

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