This project forked from wzzzd/lstm_captcha
基于tensorflow的LSTM网络识别验证码
关于验证码识别，试过使用传统的machine learning方式识别，在相同样本下效果还算可以，但当迁移到别的数据集时，效果不理想。
对于使用深度学习识别验证码，尝试过使用LeNet-5、AlexNet两种卷积网络，可能是网络结构简单的原因，结果不收敛。故尝试用了RNN中的LSTM单元网络来识别，效果较理想。
使用Adam算法替代梯度下降，迭代到3000次，accuracy达0.65，loss小于0.03。继续进行迭代、或优化能到达更高的准确率。
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