The key problem of training support vector machines is how to solve quadratic programming problem, but for large training examples, the problem is too difficult.
训练支持向量机的本质问题就是求解二次规划问题，但对大规模的训练样本来说，求解二次规划问题困难很大。
The problem is too difficult for me to work out.
这道题太难了，我做不出。
The problem is too difficult for me to work out.
这道题太难了，我做不出。
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