---
# System prepended metadata

title: Cross-entropy VS Square-error
tags: [課程共筆]

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###### tags: `課程共筆`

# Cross-entropy VS Square-error

> Fig.1 黑色與紅色哪一個是Cross-entropy?
> ![](https://i.imgur.com/wsmBVA0.png =360x)

### Cross-entropy VS Square-error在梯度下降時的特性差異
> Hint:
>> cross entropy距離目標越遠, 微分值越大
> Square error, 離目標遠的時候微分很小, 移動速度非常慢, 會永遠卡在那裡
> Why?

