def symlink_file_relative(self, source_filename, link_filename):
        if not os.path.exists(self.paths.root_dir):
            os.makedirs(self.paths.root_dir)
        os.symlink(
            source_filename,
            self.paths.to_file(link_filename),
        )
Create a symlink in our service root from source_filename to
dataset/ETHPy150Open Yelp/paasta/paasta_tools/cli/fsm/service.py/SrvReaderWriter.symlink_file_relative