https://hackmd.io/@joshhu/SJ2UG4UdS
靠近輸入層Gradient值非常小,靠近輸出層的Gradient很大,相同學習率靠近輸入層參數updata會很慢,靠近輸出層的參數updata會很快。當前幾層都還沒有更動參數的時候(隨機),之後幾層的參數就已經收斂了。
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