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This allows user to use relative weights for different examples (adjust C_i)

Usage: svm-train -W 1 heart.wgt.10

Note that the result should be similar to (numerically the same as)

svm-train heart.10

Currently supporting C_SVC (default) and EPSILON_SVR (-s 3)

The python interface is also modified. See svm_w_usage.py for details