ConvergenceWarning: Liblinear failed to converge, increase the number of iterations

问题

Running the code of linear binary pattern for Adrian. This program runs but gives the following warning:

C:\Python27\lib\site-packages\sklearn\svm\base.py:922: ConvergenceWarning: Liblinear failed to converge, increase the number of iterations.
 "the number of iterations.", ConvergenceWarning

I am running python2.7 with opencv3.7, what should I do?

回答1:

Normally when an optimization algorithm does not converge, it is usually because the problem is not well-conditioned, perhaps due to a poor scaling of the decision variables. There are a few things you can try.

1. Normalize your training data so that the problem hopefully becomes more well conditioned, which in turn can speed up convergence. One possibility is to scale your data to 0 mean, unit standard deviation using Scikit-Learn's StandardScaler for an example. Note that you have to apply the StandardScaler fitted on the training data to the test data.
2. Related to 1), make sure the other arguments such as regularization weight, C, is set appropriately.
3. Set max_iter to a larger value. The default is 1000.

来源：https://stackoverflow.com/questions/52670012/convergencewarning-liblinear-failed-to-converge-increase-the-number-of-iterati