def insert(self, doc, synced=False):
        doc.id = self.get_next_id()
        doc.synced = synced
        try:
            self.db.docs.insert(doc)
        except Exception as e:
            raise DatabaseException(e)
        return doc
def sample_fn(x):
    return utils.optimise_and_sample(x, module=model,
                                     data=None, is_training=False)[0]