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docs: cross-link to the chat sister model

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  1. README.md +20 -1
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@@ -110,6 +110,25 @@ Baseline, the untouched base model (measured 2026-11-09, 100k held-out tokens pe
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  Fine-tuned numbers: *(pending)*. The acceptance gate is a clear drop in Russian bits/char with at most a
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  ~10% regression on English and Chinese bits/char.
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  ## Intended use
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  - On-device next-word and short-phrase suggestion in a keyboard or IME, Russian first, English and Chinese
@@ -131,7 +150,7 @@ This checkpoint is the first of several variants, ordered by cost:
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  | Variant | What | Status |
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  |---|---|---|
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  | **v1** | Russian continuation model — this run | training |
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- | **v2** | Russian assistant: instruction tuning (SFT on ChatML) on top of v1, not a separate pretraining run | planned |
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  | **v3** | Tokenizer extension: ~4–8k extra Cyrillic BPE merges plus an embedding resize, warm-started from v1, cutting Russian tokens per word by roughly half | optional, after v1 |
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  | **v4** | Quantised builds for devices: GGUF Q8_0 / Q4_K_M and MNN INT4, with device-side tok/s measurements | after v1 |
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  Fine-tuned numbers: *(pending)*. The acceptance gate is a clear drop in Russian bits/char with at most a
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  ~10% regression on English and Chinese bits/char.
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+ ## Two models, two jobs
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+
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+ This repository is the **continuation** model. Its sister,
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+ [`Rahspide/MNN-Pocket-0.3B-RU-Chat`](https://huggingface.co/Rahspide/MNN-Pocket-0.3B-RU-Chat), is the
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+ **assistant** — same base, same Russian, different job.
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+
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+ | | This model — `MNN-Pocket-0.3B-RU` | Sister — `MNN-Pocket-0.3B-RU-Chat` |
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+ |---|---|---|
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+ | Job | continue text | follow instructions |
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+ | Input | a prefix, often mid-sentence | a system + user message |
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+ | Output | the plausible continuation | an answer |
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+ | Trained with | continued pretraining on 1.2B tokens of raw text | instruction tuning on top of this model |
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+ | Choose it for | keyboard suggestions, autocomplete, prefix completion | chat, Q&A, short rewrites |
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+ | Do not choose it for | assistant behaviour: it will continue your question instead of answering it | autocomplete: it will answer instead of continuing |
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+
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+ The split exists because the two tasks reward opposite behaviour. Training a single checkpoint on both makes
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+ it mediocre at each: a continuation model that starts answering, and an assistant that leaks into
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+ completion mode.
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+
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  ## Intended use
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  - On-device next-word and short-phrase suggestion in a keyboard or IME, Russian first, English and Chinese
 
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  | Variant | What | Status |
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  |---|---|---|
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  | **v1** | Russian continuation model — this run | training |
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+ | **v2** | Russian assistant: instruction tuning (SFT on ChatML) on top of v1, not a separate pretraining run — see [`MNN-Pocket-0.3B-RU-Chat`](https://huggingface.co/Rahspide/MNN-Pocket-0.3B-RU-Chat) | planned |
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  | **v3** | Tokenizer extension: ~4–8k extra Cyrillic BPE merges plus an embedding resize, warm-started from v1, cutting Russian tokens per word by roughly half | optional, after v1 |
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  | **v4** | Quantised builds for devices: GGUF Q8_0 / Q4_K_M and MNN INT4, with device-side tok/s measurements | after v1 |
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