You should be able to instantiate the registration method and metric as below:
registration_metric = itk.PointSetToPointSetMetric.PSF3.New()
registration_method = itk.PointSetToPointSetRegistrationMethod.REGF3F3.New()
You should be able to instantiate the registration method and metric as below:
registration_metric = itk.PointSetToPointSetMetric.PSF3.New()
registration_method = itk.PointSetToPointSetRegistrationMethod.REGF3F3.New()