Python“TypeError: 'NoneType' object is not iterable"原因
http://blog.sina.com.cn/s/blog_98f9f28f01011dqb.html
theano做dl :http://www.cnblogs.com/Ponys/archive/2013/11/28/3448616.html
theano权重子集更新 : http://blog.csdn.net/wangjian1204/article/details/50414396
theano参数保存:http://blog.csdn.net/sheng_ai/article/details/29650355
其中 x_sum = T.sum(x, axis=1)#0 是按列 1 是按行