// CreateState creates a new state for AROW classifier.
func (c *AROWStateCreator) CreateState(ctx *core.Context, params data.Map) (core.SharedState, error) {
label, err := pluginutil.ExtractParamAsStringWithDefault(params, "label_field", "label")
if err != nil {
return nil, err
}
fv, err := pluginutil.ExtractParamAsStringWithDefault(params, "feature_vector_field", "feature_vector")
if err != nil {
return nil, err
}
rw, err := pluginutil.ExtractParamAndConvertToFloat(params, "regularization_weight")
if err != nil {
return nil, err
}
if rw <= 0 {
return nil, errors.New("regularization_weight parameter must be greater than zero")
}
a, err := NewAROW(float32(rw))
if err != nil {
return nil, fmt.Errorf("failed to initialize AROW: %v", err)
}
return &AROWState{
arow: a,
labelField: label,
featureVectorField: fv,
}, nil
}
func (c *PassiveAggressiveStateCreator) CreateState(ctx *core.Context, params data.Map) (core.SharedState, error) {
value, err := pluginutil.ExtractParamAsStringWithDefault(params, "value_field", "value")
if err != nil {
return nil, err
}
fv, err := pluginutil.ExtractParamAsStringWithDefault(params, "feature_vector_field", "feature_vector")
if err != nil {
return nil, err
}
rw, err := pluginutil.ExtractParamAndConvertToFloat(params, "regularization_weight")
if err != nil {
return nil, err
}
if rw <= 0 {
return nil, errors.New("regularization_weight parameter must be greater than zero")
}
sen, err := pluginutil.ExtractParamAndConvertToFloat(params, "sensitivity")
if err != nil {
return nil, err
}
if sen < 0 {
return nil, errors.New("sensitivity parameter must be not less than zero")
}
pa, err := NewPassiveAggressive(float32(rw), float32(sen))
if err != nil {
return nil, err
}
return &PassiveAggressiveState{
pa: pa,
valueField: value,
featureVectorField: fv,
}, nil
}