bobofamilyNotes and posts by Niu Chun — backend, iOS, Android and web.https://bobofamily.spaceMulti-Path Summation: The Σ a Single-Output Network Hideshttps://bobofamily.space/notes/multi-path-sumhttps://bobofamily.space/notes/multi-path-sumGoing from 1 output neuron to 2 adds one step to backpropagation. That step is not a new rule — the multivariable chain rule had it all along.Sat, 29 Aug 2026 00:00:00 GMTllm3blue1brownbackpropchain-ruleGradients and Backpropagation: Three Rounds with One Cathttps://bobofamily.space/notes/gradient-and-backprophttps://bobofamily.space/notes/gradient-and-backpropA 2→2→1 network, and where every single number in three rounds of training comes from. Plus two things you only see once you actually run it.Fri, 28 Aug 2026 00:00:00 GMTllm3blue1brownbackpropgradient-descentWhat a Neural Network Actually Is: A Function with 13,002 Parametershttps://bobofamily.space/notes/what-is-a-neural-networkhttps://bobofamily.space/notes/what-is-a-neural-networkStarting from handwritten digit recognition: what neurons, layers, weights, biases and activation functions each are, and why the whole network is only a function.Fri, 28 Aug 2026 00:00:00 GMTllm3blue1brownnn-basics红烧刀鱼https://bobofamily.space/posts/braised-knifefishhttps://bobofamily.space/posts/braised-knifefish长江三鲜里最亲切的那一味。以及大人给孩子夹鱼时，总先剃掉的那排菠菜籽刺。Wed, 24 Jun 2026 00:00:00 GMTfoodjingjiangriver-fish