How to use the fitlins.interfaces.bids.BIDSLayout function in fitlins

def _run_interface(self, runtime):
        import bids
        from bids.analysis import auto_model
        models = self.inputs.model
        if not isinstance(models, list):
            database_path = self.inputs.database_path
            layout = bids.BIDSLayout.load(database_path=database_path)

            if not isdefined(models):
                # model is not yet standardized, so validate=False
                # Ignore all subject directories and .git/ and .datalad/ directories
                small_layout = bids.BIDSLayout(
                    layout.root, derivatives=[d.root for d in layout.derivatives.values()],
                    validate=False,
                    ignore=[re.compile(r'sub-'),
                            re.compile(r'\.(git|datalad)')])
                # PyBIDS can double up, so find unique models
                models = list(set(small_layout.get(suffix='smdl', return_type='file')))
                if not models:
                    raise ValueError("No models found")
            elif models == 'default':
                models = auto_model(layout)

        models = [_ensure_model(m) for m in models]

        if self.inputs.selectors:
            # This is almost certainly incorrect
            models = [model for model in models