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# 研究图册:Qwen3.5-2B 参数几何与头贡献
这份图册与原始PNG/PDF/SVG一同保存在Git中。头贡献基线图片已随PR #6合并到main;其固定提交链接不依赖聊天附件或本机路径。后续实验分别列于下方,可通过图册所在的Git提交查看对应版本。
原始结果提交:`098ea8650c7d0e06339c66e3a0509e38b85b3d7d`;模型revision:`15852e8c16360a2fea060d615a32b45270f8a8fc`。
| 基线指标(逐观测中位数) | QKV复合变化 | √JS检索距离 |
|---|---:|---:|
| 有效头数÷总头数 | 76.0% | 55.8% |
| 最强25%头的影响份额 | 44.6% | 56.5% |
| 最弱25%头的影响份额 | 10.6% | 6.8% |
**√JS有效头数:8.931822/16;P10=5.784081,P90=11.672658。** 这是消融影响的集中程度,不是注意力概率质量。原基线为4条文本各32 token,普通注意力接收层的query7–31。
## 连续分布与尺度敏感性
![连续分布与尺度敏感性](../results/head-dominance/figures/retrieval_scale_sensitivity.png)
[PNG固定提交副本](https://gitea.entroia.com/Zayden-Jung/exp-model-parameter-similarity/raw/commit/098ea8650c7d0e06339c66e3a0509e38b85b3d7d/results/head-dominance/figures/retrieval_scale_sensitivity.png)
[PDF固定提交副本](https://gitea.entroia.com/Zayden-Jung/exp-model-parameter-similarity/raw/commit/098ea8650c7d0e06339c66e3a0509e38b85b3d7d/results/head-dominance/figures/retrieval_scale_sensitivity.pdf)
[SVG固定提交副本](https://gitea.entroia.com/Zayden-Jung/exp-model-parameter-similarity/raw/commit/098ea8650c7d0e06339c66e3a0509e38b85b3d7d/results/head-dominance/figures/retrieval_scale_sensitivity.svg)
## 联合强弱头消融
![联合强弱头消融](../results/head-dominance/figures/joint_removal_effects.png)
[PNG固定提交副本](https://gitea.entroia.com/Zayden-Jung/exp-model-parameter-similarity/raw/commit/098ea8650c7d0e06339c66e3a0509e38b85b3d7d/results/head-dominance/figures/joint_removal_effects.png)
[PDF固定提交副本](https://gitea.entroia.com/Zayden-Jung/exp-model-parameter-similarity/raw/commit/098ea8650c7d0e06339c66e3a0509e38b85b3d7d/results/head-dominance/figures/joint_removal_effects.pdf)
[SVG固定提交副本](https://gitea.entroia.com/Zayden-Jung/exp-model-parameter-similarity/raw/commit/098ea8650c7d0e06339c66e3a0509e38b85b3d7d/results/head-dominance/figures/joint_removal_effects.svg)
[完整基线报告](../results/head-dominance/REPORT.md) · [全部图表目录](../results/head-dominance/figures) · [图册SHA清单](figure-gallery-manifest.json)
使用√JS距离进行微调前后配对比较;保留JS散度作为尺度敏感性参考,避免混淆平方尺度与距离尺度。
## GSM8K微调前后配对图
[配对报告](../results/finetune-comparison/REPORT.md) · [CDF](../results/finetune-comparison/figures/paired_effective_heads_cdf.png) · [逐层分布](../results/finetune-comparison/figures/paired_effective_heads_by_layer.png) · [配对变化](../results/finetune-comparison/figures/paired_effective_heads_delta.png)
同目录保留PDF/SVG。图表随代码、原始数据和SHA清单一同提交,不依赖聊天附件。
## 高维壳与稀疏性对照
![稀疏球壳对照](../results/sparse-shell/sparse_shell_controls.png)
[条件定理、反例与数据说明](../results/sparse-shell/REPORT.md) · [PDF](../results/sparse-shell/sparse_shell_controls.pdf) · [SVG](../results/sparse-shell/sparse_shell_controls.svg)
## 两个实际2B检查点的参数球壳检验
[结论与解释](MODEL_SHELL_FINDINGS.md) · [实测报告、分组数量与限制](../results/model-shell/REPORT.md) · [固定协议](../model_shell/PROTOCOL.md) · [指标源表](../results/model-shell/metrics.csv) · [校验清单](../results/model-shell/audit.json)
![内侧质量对均匀参照的敏感性](../results/model-shell/figures/interior_reference_sensitivity.png)
![径向分布的内外两尾](../results/model-shell/figures/radial_shape_two_tails.png)
![固定角色的径向CDF示例](../results/model-shell/figures/fixed_role_radial_cdfs.png)
[微调前后配对图](../results/model-shell/figures/finetune_paired_radii.png) · [有限样本参与率](../results/model-shell/figures/participation_reference.png)。每幅图同目录均保存PDF/SVG,完整CDF及参照数据保存在`profiles.json.gz`,实测范数保存在`measured_radii.npz`;均随本次成果进入Git。