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Model: visproj/proofkit-distilled-qwen0.5b
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---
license: apache-2.0
base_model: Qwen/Qwen2.5-0.5B-Instruct
library_name: transformers
pipeline_tag: text-generation
language:
- en
tags:
- proofkit
- distilled
- sft
- build-small-hackathon
- work-sample
datasets:
- visproj/proofkit-distill-qwen0.5b
---
# ProofKit Qwen 0.5B — distilled (merged)
`Qwen/Qwen2.5-0.5B-Instruct` **distilled** from the ProofKit gpt-oss-20b teacher
([`visproj/proofkit-gpt-oss-20b-lora`](https://huggingface.co/visproj/proofkit-gpt-oss-20b-lora)).
Sequence-level (data) distillation: the teacher's completions over ProofKit's prompts
([`visproj/proofkit-distill-qwen0.5b`](https://huggingface.co/datasets/visproj/proofkit-distill-qwen0.5b))
are used to SFT the student (LoRA, 3 epochs), then merged to standalone weights.
The **GGUF build of this model**
([`visproj/proofkit-distilled-qwen0.5b-gguf`](https://huggingface.co/visproj/proofkit-distilled-qwen0.5b-gguf))
is what the ProofKit Space serves through llama.cpp — free on CPU. This merged
Transformers copy is the source for that conversion and for evaluation.
## Evaluation (post-fix, 3-judge panel)
Mean score (0100) on 15 held-out prompts, graded by Claude Opus 4.7, GPT-5.5, and a
local Qwen-3B (`gpt-oss experts` is a deliberately *un-retrained* stale control):
| model | Claude | GPT-5.5 | Qwen-3B | **Avg** |
|---|---:|---:|---:|---:|
| gpt-5.5 (frontier ceiling) | 94.6 | 95.6 | 90.8 | **93.7** |
| gpt-oss attn (retrained teacher) | 82.0 | 66.8 | 81.4 | **76.7** |
| **qwen-0.5b distilled (served)** | 79.0 | 68.6 | 82.2 | **76.6** |
| **qwen-0.5b direct 7k (served)** | 78.6 | 64.4 | 82.0 | **75.0** |
| gpt-oss experts *(stale control)* | 67.6 | 68.6 | 81.8 | **72.7** |
| qwen-3b base | 62.1 | 67.1 | 80.5 | **69.9** |
| gpt-oss base | 55.4 | 53.8 | 68.2 | **59.1** |
| qwen-0.5b base | 36.5 | 44.5 | 67.9 | **49.7** |
Both served retrained 0.5Bs beat the stale control and every untuned base across all
three judges, and the distilled 0.5B ≈ ties its own 20B teacher.
## Limitations
- 0.5B capacity; prompt-format-frozen (see below). A purpose-built ProofKit component.
## About ProofKit
[ProofKit](https://huggingface.co/spaces/visproj/proofkit) is a work-sample generator for job seekers — it turns a target
role, background, and skills-to-prove into a realistic, **clearly-fictional**
practice work sample (a role-specific challenge, a guided builder, a readiness
review, and a recruiter-ready portfolio packet). Built for the Hugging Face **Build
Small Hackathon** (Backyard AI track). Integrity rules are load-bearing: outputs
never claim real employment, metrics are labeled hypothetical, and exports carry an
ethical disclosure.
### The ProofKit model family
| Repo | What it is |
|---|---|
| [`visproj/proofkit-qwen0.5b-7k`](https://huggingface.co/visproj/proofkit-qwen0.5b-7k) | Qwen2.5-0.5B fine-tuned directly on the 7k set (Transformers) |
| [`visproj/proofkit-gpt-oss-20b-lora`](https://huggingface.co/visproj/proofkit-gpt-oss-20b-lora) | gpt-oss-20b LoRA — the distillation **teacher** |
| [`visproj/proofkit-distilled-qwen0.5b`](https://huggingface.co/visproj/proofkit-distilled-qwen0.5b) | Qwen2.5-0.5B distilled from the teacher (merged) |
| [`visproj/proofkit-distilled-qwen0.5b-gguf`](https://huggingface.co/visproj/proofkit-distilled-qwen0.5b-gguf) | GGUF of the distilled student (llama.cpp — **served**) |
| [`visproj/proofkit-sft`](https://huggingface.co/datasets/visproj/proofkit-sft) | SFT dataset (synthetic, license-safe) |
| [`visproj/proofkit-distill-qwen0.5b`](https://huggingface.co/datasets/visproj/proofkit-distill-qwen0.5b) | Distillation dataset (teacher completions) |
### A note on training data (the "static responses" fix)
An earlier version of these models produced repetitive, input-ignoring drafts. The
root cause was **synthetic-data leakage**: the dataset rendered the example *user
answers* and the *target* from the same template slots, so the model learned
`target = template` instead of `target = f(input)`. The fix — **faithfulness anchors**
(a distinctive token shared by the answer and the target) + **seeded per-example
variation** across every task, then a full-chain retrain — is what these current
weights reflect.
### Prompt format is a frozen contract
These 0.5B models were trained on the **exact** prompt shapes from ProofKit's
`prompt_formats.py`. They only behave well when prompted in that format; reworded or
free-form prompts push them off-distribution. They are purpose-built components of the
ProofKit app, not general chat models.

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{%- if tools %}
{{- '<|im_start|>system\n' }}
{%- if messages[0]['role'] == 'system' %}
{{- messages[0]['content'] }}
{%- else %}
{{- 'You are Qwen, created by Alibaba Cloud. You are a helpful assistant.' }}
{%- endif %}
{{- "\n\n# Tools\n\nYou may call one or more functions to assist with the user query.\n\nYou are provided with function signatures within <tools></tools> XML tags:\n<tools>" }}
{%- for tool in tools %}
{{- "\n" }}
{{- tool | tojson }}
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{%- elif message.role == "assistant" %}
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{{- tool_call.name }}
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{{- message.content }}
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{%- if add_generation_prompt %}
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{%- endif %}

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"chat_template": "{%- if tools %}\n {{- '<|im_start|>system\\n' }}\n {%- if messages[0]['role'] == 'system' %}\n {{- messages[0]['content'] }}\n {%- else %}\n {{- 'You are Qwen, created by Alibaba Cloud. You are a helpful assistant.' }}\n {%- endif %}\n {{- \"\\n\\n# Tools\\n\\nYou may call one or more functions to assist with the user query.\\n\\nYou are provided with function signatures within <tools></tools> XML tags:\\n<tools>\" }}\n {%- for tool in tools %}\n {{- \"\\n\" }}\n {{- tool | tojson }}\n {%- endfor %}\n {{- \"\\n</tools>\\n\\nFor each function call, return a json object with function name and arguments within <tool_call></tool_call> XML tags:\\n<tool_call>\\n{\\\"name\\\": <function-name>, \\\"arguments\\\": <args-json-object>}\\n</tool_call><|im_end|>\\n\" }}\n{%- else %}\n {%- if messages[0]['role'] == 'system' %}\n {{- '<|im_start|>system\\n' + messages[0]['content'] + '<|im_end|>\\n' }}\n {%- else %}\n {{- '<|im_start|>system\\nYou are Qwen, created by Alibaba Cloud. You are a helpful assistant.<|im_end|>\\n' }}\n {%- endif %}\n{%- endif %}\n{%- for message in messages %}\n {%- if (message.role == \"user\") or (message.role == \"system\" and not loop.first) or (message.role == \"assistant\" and not message.tool_calls) %}\n {{- '<|im_start|>' + message.role + '\\n' + message.content + '<|im_end|>' + '\\n' }}\n {%- elif message.role == \"assistant\" %}\n {{- '<|im_start|>' + message.role }}\n {%- if message.content %}\n {{- '\\n' + message.content }}\n {%- endif %}\n {%- for tool_call in message.tool_calls %}\n {%- if tool_call.function is defined %}\n {%- set tool_call = tool_call.function %}\n {%- endif %}\n {{- '\\n<tool_call>\\n{\"name\": \"' }}\n {{- tool_call.name }}\n {{- '\", \"arguments\": ' }}\n {{- tool_call.arguments | tojson }}\n {{- '}\\n</tool_call>' }}\n {%- endfor %}\n {{- '<|im_end|>\\n' }}\n {%- elif message.role == \"tool\" %}\n {%- if (loop.index0 == 0) or (messages[loop.index0 - 1].role != \"tool\") %}\n {{- '<|im_start|>user' }}\n {%- endif %}\n {{- '\\n<tool_response>\\n' }}\n {{- message.content }}\n {{- '\\n</tool_response>' }}\n {%- if loop.last or (messages[loop.index0 + 1].role != \"tool\") %}\n {{- '<|im_end|>\\n' }}\n {%- endif %}\n {%- endif %}\n{%- endfor %}\n{%- if add_generation_prompt %}\n {{- '<|im_start|>assistant\\n' }}\n{%- endif %}\n"
}

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