How to use the smriprep.interfaces.reports.SummaryInterface function in smriprep

class _SubjectSummaryInputSpec(BaseInterfaceInputSpec):
    t1w = InputMultiObject(File(exists=True), desc='T1w structural images')
    t2w = InputMultiObject(File(exists=True), desc='T2w structural images')
    subjects_dir = Directory(desc='FreeSurfer subjects directory')
    subject_id = Str(desc='Subject ID')
    output_spaces = InputMultiObject(Str, desc='list of standard spaces')


class _SubjectSummaryOutputSpec(_SummaryOutputSpec):
    # This exists to ensure that the summary is run prior to the first ReconAll
    # call, allowing a determination whether there is a pre-existing directory
    subject_id = Str(desc='FreeSurfer subject ID')


class SubjectSummary(SummaryInterface):
    """Subject html summary reportlet."""

    input_spec = _SubjectSummaryInputSpec
    output_spec = _SubjectSummaryOutputSpec

    def _run_interface(self, runtime):
        if isdefined(self.inputs.subject_id):
            self._results['subject_id'] = self.inputs.subject_id
        return super(SubjectSummary, self)._run_interface(runtime)

    def _generate_segment(self):
        if not isdefined(self.inputs.subjects_dir):
            freesurfer_status = 'Not run'
        else:
            recon = fs.ReconAll(subjects_dir=self.inputs.subjects_dir,
                                subject_id=self.inputs.subject_id,

output_spaces = ', '.join(output_spaces)

        return SUBJECT_TEMPLATE.format(subject_id=self.inputs.subject_id,
                                       n_t1s=len(self.inputs.t1w),
                                       t2w=t2w_seg,
                                       output_spaces=output_spaces,
                                       freesurfer_status=freesurfer_status)


class _AboutSummaryInputSpec(BaseInterfaceInputSpec):
    version = Str(desc='sMRIPrep version')
    command = Str(desc='sMRIPrep command')
    # Date not included - update timestamp only if version or command changes


class AboutSummary(SummaryInterface):
    """About section reportlet."""

    input_spec = _AboutSummaryInputSpec

    def _generate_segment(self):
        return ABOUT_TEMPLATE.format(version=self.inputs.version,
                                     command=self.inputs.command,
                                     date=time.strftime("%Y-%m-%d %H:%M:%S %z"))


class _FSSurfaceReportInputSpec(_SVGReportCapableInputSpec, _FSSourceInputSpec):
    pass


class _FSSurfaceReportOutputSpec(reporting.ReportCapableOutputSpec):
    pass