simple artificial neural network
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具体数学原理参见博客，推导很详尽。
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根目录下的py文件为原始实现，advanced_version使用numpy实现。
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Iris数据集上效果：
- sigmoid:
- 1000轮: 0.984375
- 2000轮: 0.992188
- tanh:
- 1000轮: 0.992188
- 2000轮: 0.992188
- sigmoid:
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Iris数据集上，tanh收敛更快
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