func cNodes(nodes []FeatureValue) *C.svm_node_t {
n := C.gosvm_nodes_new(C.size_t(len(nodes)))
for idx, val := range nodes {
C.gosvm_nodes_put(n, C.size_t(idx), C.int(val.Index), C.double(val.Value))
}
return n
}
func (problem *Problem) Add(trainInst TrainingInstance) {
features := sortedFeatureVector(trainInst.Features)
nodes := C.gosvm_nodes_new(C.size_t(len(features)))
for idx, val := range features {
C.gosvm_nodes_put(nodes, C.size_t(idx), C.int(val.Index), C.double(val.Value))
}
C.gosvm_problem_add_train_inst(problem.problem, nodes, C.double(trainInst.Label))
}