Python Chi2Kernel Examples

Example #1

def preprocessor_randomfouriergausspreproc_modular(fm_train_real=traindat,
                                                   fm_test_real=testdat,
                                                   width=1.4,
                                                   size_cache=10):
    from shogun.Kernel import Chi2Kernel
    from shogun.Features import RealFeatures
    from shogun.Preprocessor import RandomFourierGaussPreproc

    feats_train = RealFeatures(fm_train_real)
    feats_test = RealFeatures(fm_test_real)

    preproc = RandomFourierGaussPreproc()
    preproc.init(feats_train)
    feats_train.add_preprocessor(preproc)
    feats_train.apply_preprocessor()
    feats_test.add_preprocessor(preproc)
    feats_test.apply_preprocessor()

    kernel = Chi2Kernel(feats_train, feats_train, width, size_cache)

    km_train = kernel.get_kernel_matrix()
    kernel.init(feats_train, feats_test)
    km_test = kernel.get_kernel_matrix()

    return km_train, km_test, kernel

Example #2

def preprocessor_logplusone_modular(fm_train_real=traindat,
                                    fm_test_real=testdat,
                                    width=1.4,
                                    size_cache=10):

    from shogun.Kernel import Chi2Kernel
    from shogun.Features import RealFeatures
    from shogun.Preprocessor import LogPlusOne

    feats_train = RealFeatures(fm_train_real)
    feats_test = RealFeatures(fm_test_real)

    preproc = LogPlusOne()
    preproc.init(feats_train)
    feats_train.add_preprocessor(preproc)
    feats_train.apply_preprocessor()
    feats_test.add_preprocessor(preproc)
    feats_test.apply_preprocessor()

    kernel = Chi2Kernel(feats_train, feats_train, width, size_cache)

    km_train = kernel.get_kernel_matrix()
    kernel.init(feats_train, feats_test)
    km_test = kernel.get_kernel_matrix()

    return km_train, km_test, kernel

Example #3

def preprocessor_prunevarsubmean_modular(fm_train_real=traindat,
                                         fm_test_real=testdat,
                                         width=1.4,
                                         size_cache=10):
    from shogun.Kernel import Chi2Kernel
    from shogun.Features import RealFeatures
    from shogun.Preprocessor import PruneVarSubMean

    feats_train = RealFeatures(fm_train_real)
    feats_test = RealFeatures(fm_test_real)

    preproc = PruneVarSubMean()
    preproc.init(feats_train)
    feats_train.add_preprocessor(preproc)
    feats_train.apply_preprocessor()
    feats_test.add_preprocessor(preproc)
    feats_test.apply_preprocessor()

    kernel = Chi2Kernel(feats_train, feats_train, width, size_cache)

    km_train = kernel.get_kernel_matrix()
    kernel.init(feats_train, feats_test)
    km_test = kernel.get_kernel_matrix()

    return km_train, km_test, kernel

Example #4

File: kernel_chi2_modular.py Project: pombredanne/rqpersonalsvn

def kernel_chi2_modular (fm_train_real=traindat,fm_test_real=testdat,width=1.4, size_cache=10):
	from shogun.Kernel import Chi2Kernel
	from shogun.Features import RealFeatures
	
	feats_train=RealFeatures(fm_train_real)
	feats_test=RealFeatures(fm_test_real)
	
	
	kernel=Chi2Kernel(feats_train, feats_train, width, size_cache)

	km_train=kernel.get_kernel_matrix()
	kernel.init(feats_train, feats_test)
	km_test=kernel.get_kernel_matrix()
	return km_train,km_test,kernel