post_process method
Method to be implemented in subclass to apply post-processing on the given tokens.
@param {Array} tokens The input tokens to be post-processed. @param {...*} args Additional arguments required by the post-processing logic. @returns {PostProcessedOutput} The post-processed tokens. @throws {Error} If the method is not implemented in subclass.
Implementation
PostProcessedOutput post_process(List<String>? tokens, [List<String>? tokens2, bool? add_special_tokens]) {
throw UnimplementedError('post_process should be implemented in subclass.');
}