On 09/24/2010 08:33 PM, Yaroslav Halchenko wrote:
please share how it is possible in LibSVM and we will make it possible
in pymvpa... I guess we have missed that since I thought it is possible
only with CustomKernel from shogun (i.e. now you can use shogun's
interface to achieve that, in the development branch, series 0.5, of
PyMVPA)
Thanks, that would be greate.
Also I will look into the development branch for the shogun interface.
About Libsvm:
You are probably interested in how it is possible over the C API.
I only use the command line interface and how to use precomputed kernels
with that is documented in the README.
By the way, I am using libsvm version 2.91.
As far as I can see the kernel_type defined in svm.h lists a PRECOMPUTED
type.
This makes the k_function behave appropriately.
The function read_problem in svm-train.c shows how to build a a "problem"
from a given kernel matrix.
Hope that helps.
Cheers Andy
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