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camescopetech/GenAI_DeepLesion

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本プロジェクトは、CTデータセット DeepLesion の肺病変(Coarse_lesion_type==5)を抽出して、2種類の変分オートエンコーダ(GVAE:ガウス事前分布、DirVAE:ディリクレ事前分布)を比較する研究実装です。主な目的は再構成品質(SSIM、MSE、MAE)、潜在空間構造(UMAP)、視覚的な disentanglement(潜在変化のトラバース)を評価することです。実装は単一のノートブック(main.ipynb)にまとまり、画像はクロップ・HUウィンドウ(-1000〜400)・64×64 にリサイズして正規化、70/15/15 に分割して学習します。両モデルは同一の畳み込みエンコーダ・デコーダ(潜在次元256)を共有し、損失はL1+SSIMとKLアニーリングを組み合わせます。結果は GVAE が再構成指標で優位(SSIM 0.294 vs 0.248)かつ多くの潜在次元を活用(249/256)する一方、DirVAE は強いスパース化により潜在崩壊(3/256)を起こし再構成性能が低かったと報告しています。Kaggle 上で再現可能で、結果は results/ に図やCSVで保存されます。

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camescopetech
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AI Engineering student @ CY Tech · ML for healthcare · Medical imaging & clinical NLP · Apprentice @ La Forge · Previously @ TALOS Lab

Dates

Created on GitHub 2026-05-09
Last push 2026-05-09
First seen here 2026-05-09
Last fetched 2026-05-09 14:57

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