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_response=requests.get('https://codingai-lec03.pages.dev/course/materials/lecture03-clip-retrieval.zip',timeout=60)\n    _response.raise_for_status()\n    _data=_response.content\n    print('下载材料 ZIP:',len(_data),'bytes; SHA256',hashlib.sha256(_data).hexdigest())\n    with zipfile.ZipFile(io.BytesIO(_data)) as z:\n        for info in z.infolist():\n            target=(Path.cwd()/info.filename).resolve()\n            assert target.is_relative_to(Path.cwd().resolve()), '拒绝越界路径'\n            if info.is_dir():target.mkdir(parents=True,exist_ok=True)\n            elif not target.exists():\n                target.parent.mkdir(parents=True,exist_ok=True);target.write_bytes(z.read(info))\n    RETRIEVAL_ROOT=Path.cwd()/'lecture03-clip-retrieval'\nassert (RETRIEVAL_ROOT/'cache/provenance.json').is_file()\nsys.path.insert(0,str(RETRIEVAL_ROOT))\nimport run_clip_retrieval as cr\nimport numpy as np\np=json.loads((RETRIEVAL_ROOT/'cache/provenance.json').read_text())\nassert cr.sha(RETRIEVAL_ROOT/'cache/clip-features.npz')==p['cache_sha256']\nassert cr.sha(RETRIEVAL_ROOT/'assets/manifest.json')==p['manifest_sha256']\nmanifest=json.loads((RETRIEVAL_ROOT/'assets/manifest.json').read_text())\nfor r in manifest['gallery']+manifest['relation']+manifest['holder']:\n    assert cr.sha(RETRIEVAL_ROOT/r['path'])==r['sha256']\na=np.load(RETRIEVAL_ROOT/'cache/clip-features.npz')\nprint('已核验真实 CLIP 缓存；生成时间',p['generated_at_utc'])\nprint('本格只载入缓存，没有在当前 notebook 运行 CLIP 编码器。')\nprint('gallery, queries:',a['gallery'].shape,a['queries'].shape)\n\n```","sha256":"3d32c29794a1b985da1ce28a5c69a139c3d4040422600609c15a1f81f9536114","chapter":{"id":"course","title":"1 · 输入、来源、编码和缓存身份 · 实现代码"},"unit":{"id":"notebook-blocks/0befde2587964e63937189481b9abcce","title":"1 · 输入、来源、编码和缓存身份 · 实现代码"},"page":{"id":"reading-opening","title":"1 · 输入、来源、编码和缓存身份 · 实现代码","number":1},"sectionTitle":"1 · 输入、来源、编码和缓存身份 · 实现代码","currentQuestion":"1 · 输入、来源、编码和缓存身份 · 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