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多分类损失函数 梯度那里没看懂 #7

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@2hip3ng

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@2hip3ng

https://github.com/yizt/numpy_neural_network/blob/master/nn/losses.py
dy = y_probability - y_true 这个地方的推导不是很理解。大佬这个多分类的损失函数求梯度咋来的啊。

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