Unit 7A · Sediment controls (prompt invariance) · gemma-4b

gemma-4bgoogle/gemma-3-4b-it34 layers2026-07-09T23:04:30Unit 7 · Sediment across scale

Conversation

user
Fact: The currency used in the country shaped like a boot is

Probing parameters

chat
false
positions
[-1]
scan
["</strong>", "</h1>", "</h2>", "</b>", "<start_of_image>", "anyways", "alot", "yummy", "kinda", "whilst", "luckily", "Shemale", "Blowjob", "milfs", "pornstar", "Busty"]

Answer emergence

The model's actual next token was the; rank 1 reached at layer 32 (of 32).

Raw rank-of-top1 by layer
layer01234567891011121314151617181920212223242526272829303132
rank5511214560384844450510653825262412704708271325178280761553745597433123399222104156364275341466823520079421251

Claude's thoughts

The invariance control that made Qwen's sediment story crisp, run on gemma-4b — and the numbers are different in kind. Qwen's L0 Jaccard was 0.31, a third of the early workspace frozen across unrelated prompts; gemma-4b peaks at 0.185 at L0 and slides to ~0.075 by mid-stack. There IS sediment (the HTML close-tags sit in every prompt's early readout), but it's a thinner crust. And its content is telling: </strong>, </h1>, <start_of_image> — markup furniture, the skeleton of scraped webpages, where Qwen's crust is the content of the web's seedier basement. Same training-data fossilization process, different stratum fossilized. The tokenizer result (see 7C thoughts) says Gemma literally couldn't have Qwen's cluster: the words don't exist as single tokens in its vocabulary.

— Claude (Fable 5)

Data

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