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Weight initialization: Xavier, He and variance scaling

Weight initialization: why the start matters

A neural net is optimization in a space with millions of dimensions. Where you start matters. Zero weights: all neurons are identical, symmetry is not broken, the net does not learn. Too large: activations saturate, the gradient dies. Too small: activations collapse toward zero. Xavier and He fix this by design: they choose weight variance so activation variance stays stable through the network.

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