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实现代码","currentQuestion":"索引热身仍然有用，但不能叫学到了语义 · 实现代码","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-ce79dadef13512859ab289f1","nextBlock":"b-29435464580a67cd9391d25a","prerequisites":[{"id":"b-1320b7d0f37c4ed86b11796b","url":"#b-1320b7d0f37c4ed86b11796b","role":"section-title"},{"id":"b-b4ba8ae18884d2ff287bfd5c","url":"#b-b4ba8ae18884d2ff287bfd5c","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-29435464580a67cd9391d25a","type":"pre","scope":"document","url":"https://codingai-lec03.pages.dev/course/notebook-blocks/70b5b57303494570a973d1cf27053299.html#b-29435464580a67cd9391d25a","content":"```\nimport os, tempfile\nLAB_WORKDIR = tempfile.mkdtemp(prefix='lecture03-')\nos.chdir(LAB_WORKDIR)\nprint('Ephemeral experiment workspace ready')\nimport numpy as np\nx=np.arange(16,dtype=float).reshape(4,4)\nfor visible in ([0,3,9,14],[0,5,10,15,3,6,9,12]):\n mask=np.ones(16,bool); mask[list(visible)]=False\n pred=np.full(16,x.ravel()[list(visible)].mean())\n mse=((pred[mask]-x.ravel()[mask])**2).mean()\n print('visible',len(visible),'masked',mask.sum(),'masked MSE',round(float(mse),3))\nrng=np.random.default_rng(7);ids_shuffle=rng.permutation(16)\nids_restore=np.argsort(ids_shuffle);visible=ids_shuffle[:4]\nshuffled=np.concatenate([x.ravel()[visible],np.full(12,-1.)])\nrestored=shuffled[ids_restore]\nassert np.array_equal(restored[visible],x.ravel()[visible])\nprint('shuffle',ids_shuffle,'restore',ids_restore,'restored',restored)\n```","sha256":"a5e8ed9d3fedff981b54ed3173e41c010f861683fde366e467627a295d351e8f","chapter":{"id":"course","title":"索引热身仍然有用，但不能叫学到了语义 · 实现代码"},"unit":{"id":"notebook-blocks/70b5b57303494570a973d1cf27053299","title":"索引热身仍然有用，但不能叫学到了语义 · 实现代码"},"page":{"id":"reading-opening","title":"索引热身仍然有用，但不能叫学到了语义 · 实现代码","number":1},"sectionTitle":"索引热身仍然有用，但不能叫学到了语义 · 实现代码","currentQuestion":"索引热身仍然有用，但不能叫学到了语义 · 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