Execution attempt

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← Experiment E12 · When Qwen2.5-1.5B answers a translation-paired multiple-choice item correctly in English and incorrectly in Polish, is the knowledge present in its forward pass but not reached from the Polish prompt, or absent from what the Polish prompt can reach?

Execution attempt · A132 · planned

Patches Qwen2.5-1.5B after 500M tokens of continued pretraining with its own tokenizer at the confirmation layer pairs on the base model's forward-discordant pairs, with the irrelevant-source control.

Succeeded · Registered by @stw2 via agent. Reported and received times are kept apart; no computation or result is verified.

Pinned source and configuration

https://github.com/stw2/tokenizer-science-tax @ 633b3ba1ce916e432ae5ba4e0a706ad58b53b2e9

Reference checked 2026-09-14 13:18 UTC. Later commits, branches or plan changes do not retarget this attempt.

Command
python scripts/04_scan.py p3 --tag armA_500M
Working directory
experiments/E12-activation-patching
Configuration paths
None
Parameters
model armA_500M; pairs from p2_pairs.json; anchor A1; direction forward; specific and irrelevant sources
Environment
3.12.13; PyTorch MPS, bf16, decoder-layer forward pre-hooks; Apple silicon, 128 GB unified memory
Output directory
Not recorded

Inputs

Materials the registrant named when registering this attempt, by content identity; obtainability is derived from their location reports. Nothing is fetched or verified.

  • original-tokenizer arm at 500M tokens · model · M140 ckpt_00500M · raw output · Ask the reporter
  • sets.json · patch sets · M518 sets.json · raw output · Download
  • p2_pairs.json · layer pairs · M530 p2_pairs.json · raw output · Download
  • E11 belebele_en.jsonl · evaluation data · M485 belebele_en.jsonl · raw output · Download
  • E11 belebele_pl.jsonl · evaluation data · M486 belebele_pl.jsonl · raw output · Download
  • E11 mmlu_en.jsonl · evaluation data · M487 mmlu_en.jsonl · raw output · Download
  • E11 mmlu_pl.jsonl · evaluation data · M488 mmlu_pl.jsonl · raw output · Download

Delivered events

  1. Registered

    #1

    Patches Qwen2.5-1.5B after 500M tokens of continued pretraining with its own tokenizer at the confirmation layer pairs on the base model's forward-discordant pairs, with the irrelevant-source control.

    reported · received · @stw2 via agent · posted to the Thread

  2. Started

    #2

    Started.

    reported · received · @stw2 via agent · attempt only

  3. Succeeded

    #3

    Completed with exit code 0.

    Exit code 0.

    • scan_p3_armA_500M.jsonl · https://github.com/stw2/tokenizer-science-tax/blob/633b3ba1ce916e432ae5ba4e0a706ad58b53b2e9/experiments/E12-activation-patching/results/scan_p3_armA_500M.jsonl · public · sha256 159eda817d22… · 564449 bytes · M533

    reported · received · @stw2 via agent · posted to the Thread

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