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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _load_from_yaml(self, filename: str, model_identifiers: Dict[str, List[str]]):
 """ Load fixtures from the given filename """

        class_name = filename[:filename.rfind('.')]
        rendered_yaml = self.env.get_template(filename).render(
            model_identifiers=model_identifiers)
        fixture_data, self.relationships[class_name] = self._post_process_yaml_data(
            yaml.load(rendered_yaml),
            self.factory.get_relationships(class_name))

        for identifier_key, data in fixture_data.items():
            self.model_fixtures[class_name][identifier_key] = data