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00011 #include <shogun/machine/LinearMachine.h>
00012 #include <shogun/labels/RegressionLabels.h>
00013 #include <shogun/base/Parameter.h>
00014
00015 using namespace shogun;
00016
00017 CLinearMachine::CLinearMachine()
00018 : CMachine(), bias(0), features(NULL)
00019 {
00020 init();
00021 }
00022
00023 CLinearMachine::CLinearMachine(CLinearMachine* machine) : CMachine(),
00024 bias(0), features(NULL)
00025 {
00026 set_w(machine->get_w().clone());
00027 set_bias(machine->get_bias());
00028
00029 init();
00030 }
00031
00032 void CLinearMachine::init()
00033 {
00034 SG_ADD(&w, "w", "Parameter vector w.", MS_NOT_AVAILABLE);
00035 SG_ADD(&bias, "bias", "Bias b.", MS_NOT_AVAILABLE);
00036 SG_ADD((CSGObject**) &features, "features", "Feature object.",
00037 MS_NOT_AVAILABLE);
00038 }
00039
00040
00041 CLinearMachine::~CLinearMachine()
00042 {
00043 SG_UNREF(features);
00044 }
00045
00046 float64_t CLinearMachine::apply_one(int32_t vec_idx)
00047 {
00048 return features->dense_dot(vec_idx, w.vector, w.vlen) + bias;
00049 }
00050
00051 CRegressionLabels* CLinearMachine::apply_regression(CFeatures* data)
00052 {
00053 SGVector<float64_t> outputs = apply_get_outputs(data);
00054 return new CRegressionLabels(outputs);
00055 }
00056
00057 CBinaryLabels* CLinearMachine::apply_binary(CFeatures* data)
00058 {
00059 SGVector<float64_t> outputs = apply_get_outputs(data);
00060 return new CBinaryLabels(outputs);
00061 }
00062
00063 SGVector<float64_t> CLinearMachine::apply_get_outputs(CFeatures* data)
00064 {
00065 if (data)
00066 {
00067 if (!data->has_property(FP_DOT))
00068 SG_ERROR("Specified features are not of type CDotFeatures\n");
00069
00070 set_features((CDotFeatures*) data);
00071 }
00072
00073 if (!features)
00074 return SGVector<float64_t>();
00075
00076 int32_t num=features->get_num_vectors();
00077 ASSERT(num>0);
00078 ASSERT(w.vlen==features->get_dim_feature_space());
00079
00080 float64_t* out=SG_MALLOC(float64_t, num);
00081 features->dense_dot_range(out, 0, num, NULL, w.vector, w.vlen, bias);
00082 return SGVector<float64_t>(out,num);
00083 }