code: def convert(
      libsvm_model, feature_names, target, input_length, probability
  ):
      """Convert a svm model to the protobuf spec.
  
      This currently supports:
        * C-SVC
        * nu-SVC
        * Epsilon-SVR
        * nu-SVR
  
      Parameters
      ----------
      model_path: libsvm_model
         Libsvm representation of the model.
  
      feature_names : [str] | str
          Names of each of the features.
  
      target: str
          Name of the predicted class column.
  
      probability: str
          Name of the class probability column. Only used for C-SVC and nu-SVC.
  
      Returns
      -------
      model_spec: An object of type Model_pb.
          Protobuf representation of the model
      """
      if not (_HAS_LIBSVM):
          raise RuntimeError(
              "libsvm not found. libsvm conversion API is disabled."
          )
  
      from libsvm import svm as _svm
      from ...proto import SVM_pb2
      from ...proto import Model_pb2
      from ...proto import FeatureTypes_pb2
      from ...models import MLModel
  
      svm_type_enum = libsvm_model.param.svm_type
  
      # Create the spec
      export_spec = Model_pb2.Model()
      export_spec.specificationVersion = SPECIFICATION_VERSION
  
      if (
          svm_type_enum == _svm.EPSILON_SVR
          or svm_type_enum == _svm.NU_SVR
      ):
          svm = export_spec.supportVectorRegressor
      else:
          svm = export_spec.supportVectorClassifier
  
      # Set the features names
      inferred_length = _infer_min_num_features(libsvm_model)
      if isinstance(feature_names, _string_types):
          # input will be a single array
          if input_length == "auto":
              print(
                  "[WARNING] Infering an input length of %d. If this is not correct,"
                  " use the 'input_length' parameter." % inferred_length
              )
              input_length = inferred_length
          elif inferred_length > input_length:
              raise ValueError(
                  "An input length of %d was given, but the model requires an"
                  " input of at least %d."
                  % (input_length, inferred_length)
              )
  
          input = export_spec.description.input.add()
          input.name = feature_names
          input.type.multiArrayType.shape.append(input_length)
          input.type.multiArrayType.dataType = (
              Model_pb2.ArrayFeatureType.DOUBLE
          )
  
      else:
          # input will be a series of doubles
          if inferred_length > len(feature_names):
              raise ValueError(
                  "%d feature names were given, but the model requires at"
                  " least %d features."
                  % (len(feature_names), inferred_length)
              )
          for cur_input_name in feature_names:
              input = export_spec.description.input.add()
              input.name = cur_input_name
              input.type.doubleType.MergeFromString(b"")
  
      # Set target
      output = export_spec.description.output.add()
      output.name = target
  
      # Set the interface types
      if (
          svm_type_enum == _svm.EPSILON_SVR
          or svm_type_enum == _svm.NU_SVR
      ):
          export_spec.description.predictedFeatureName = target
          output.type.doubleType.MergeFromString(b"")
          nr_class = 2
  
      elif svm_type_enum == _svm.C_SVC or svm_type_enum == _svm.NU_SVC:
          export_spec.description.predictedFeatureName = target
          output.type.int64Type.MergeFromString(b"")
  
          nr_class = len(libsvm_model.get_labels())
  
          for i in range(nr_class):
              svm.numberOfSupportVectorsPerClass.append(
                  libsvm_model.nSV[i]
              )
              svm.int64ClassLabels.vector.append(libsvm_model.label[i])
  
          if probability and bool(libsvm_model.probA):
              output = export_spec.description.output.add()
              output.name = probability
              output.type.dictionaryType.MergeFromString(b"")
              output.type.dictionaryType.int64KeyType.MergeFromString(
                  b""
              )
              export_spec.description.predictedProbabilitiesName = (
                  probability
              )
  
      else:
          raise ValueError(
              "Only the following SVM types are supported: C_SVC, NU_SVC, EPSILON_SVR, NU_SVR"
          )
  
      if libsvm_model.param.kernel_type == _svm.LINEAR:
          svm.kernel.linearKernel.MergeFromString(
              b""
          )  # Hack to set kernel to an empty type
      elif libsvm_model.param.kernel_type == _svm.RBF:
          svm.kernel.rbfKernel.gamma = libsvm_model.param.gamma
      elif libsvm_model.param.kernel_type == _svm.POLY:
          svm.kernel.polyKernel.degree = libsvm_model.param.degree
          svm.kernel.polyKernel.c = libsvm_model.param.coef0
          svm.kernel.polyKernel.gamma = libsvm_model.param.gamma
      elif libsvm_model.param.kernel_type == _svm.SIGMOID:
          svm.kernel.sigmoidKernel.c = libsvm_model.param.coef0
          svm.kernel.sigmoidKernel.gamma = libsvm_model.param.gamma
      else:
          raise ValueError(
              "Unsupported kernel. The following kernel are supported: linear, RBF, polynomial and sigmoid."
          )
  
      # set rho
      # also set probA/ProbB only for SVC
      if svm_type_enum == _svm.C_SVC or svm_type_enum == _svm.NU_SVC:
          num_class_pairs = nr_class * (nr_class - 1) // 2
          for i in range(num_class_pairs):
              svm.rho.append(libsvm_model.rho[i])
          if bool(libsvm_model.probA) and bool(libsvm_model.probB):
              for i in range(num_class_pairs):
                  svm.probA.append(libsvm_model.probA[i])
                  svm.probB.append(libsvm_model.probB[i])
      else:
          svm.rho = libsvm_model.rho[0]
  
      # set coefficents
      if svm_type_enum == _svm.C_SVC or svm_type_enum == _svm.NU_SVC:
          for _ in range(nr_class - 1):
              svm.coefficients.add()
          for i in range(libsvm_model.l):
              for j in range(nr_class - 1):
                  svm.coefficients[j].alpha.append(
                      libsvm_model.sv_coef[j][i]
                  )
      else:
          for i in range(libsvm_model.l):
              svm.coefficients.alpha.append(libsvm_model.sv_coef[0][i])
  
      # set support vectors
      for i in range(libsvm_model.l):
          j = 0
          cur_support_vector = svm.sparseSupportVectors.vectors.add()
          while libsvm_model.SV[i][j].index != -1:
              cur_node = cur_support_vector.nodes.add()
              cur_node.index = libsvm_model.SV[i][j].index
              cur_node.value = libsvm_model.SV[i][j].value
              j += 1
  
      model = MLModel(export_spec)
  
      from libsvm import __version__ as libsvm_version
  
      libsvm_version = "libsvm=={0}".format(libsvm_version)
      model.user_defined_metadata[_METADATA_VERSION] = ct_version
      model.user_defined_metadata[_METADATA_SOURCE] = libsvm_version
  
      return model
  
imports: from ...None import SPECIFICATION_VERSION
  from ..._deps import _HAS_LIBSVM
  from coremltools import __version__
  from coremltools.models import _METADATA_VERSION, _METADATA_SOURCE
  from six import string_types
label_desc: Use image node_id 2 for calling a global function with example usage: convert(libsvm_model, feature_names, target, input_length, probability) and returns: model