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展开查看旧版代码（仅展示，不执行）","sha256":"b5f2d755e2ad018e90a28a20600c873333e0691cce1a7f018f374a7d482cbaf3","chapter":{"id":"course","title":"旧版热身（历史参考）"},"unit":{"id":"notebook-blocks/1658d972c93e45b4a3bb0d957f2e33d2","title":"旧版热身（历史参考）"},"page":{"id":"reading-section-1","title":"展开查看旧版代码（仅展示，不执行）","number":2},"sectionTitle":"展开查看旧版代码（仅展示，不执行）","currentQuestion":"展开查看旧版代码（仅展示，不执行）","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-40dffdb1d42122f1f59f6b38","prerequisites":[],"relatedBlocks":[]},{"id":"b-40dffdb1d42122f1f59f6b38","type":"pre","scope":"document","url":"https://codingai-lec03.pages.dev/course/notebook-blocks/1658d972c93e45b4a3bb0d957f2e33d2.html#b-40dffdb1d42122f1f59f6b38","content":"```\nimport numpy as np\nz=np.ones((8,4)); print('collapsed variance',z.var(0),'pair loss',((z-z[::-1])**2).mean())\nrng=np.random.default_rng(3); student=rng.normal(size=4); teacher=np.zeros(4)\nfor _ in range(3): teacher=.9*teacher+.1*student\nprint('EMA teacher',teacher.round(3),'stop-gradient is one component, not a proof')\n\n```","sha256":"7ec8bd14f07ee73afaacf592a08b2b09425037e648306447bf035cd5ee7ab9f7","chapter":{"id":"course","title":"旧版热身（历史参考）"},"unit":{"id":"notebook-blocks/1658d972c93e45b4a3bb0d957f2e33d2","title":"旧版热身（历史参考）"},"page":{"id":"reading-section-1","title":"展开查看旧版代码（仅展示，不执行）","number":2},"sectionTitle":"展开查看旧版代码（仅展示，不执行）","currentQuestion":"展开查看旧版代码（仅展示，不执行）","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-a7b7868149a8692101924233","nextBlock":null,"prerequisites":[{"id":"b-a7b7868149a8692101924233","url":"#b-a7b7868149a8692101924233","role":"section-title"}],"relatedBlocks":[]}]}