对于eval 的疑问

[yangliuIOC]

def preprocess_function_eval(examples):
    inputs, targets = [], []
    for i in range(len(examples[prompt_column])):
        if examples[prompt_column][i] and examples[response_column][i]:
            query = examples[prompt_column][i]
            history = examples[history_column][i] if history_column is not None else None
            prompt = tokenizer.build_prompt(query, history)
            inputs.append(prompt)
            targets.append(examples[response_column][i])

    inputs = [prefix + inp for inp in inputs]
    model_inputs = tokenizer(
        inputs, max_length=data_args.max_source_length, truncation=True, padding=True)
    labels = tokenizer(text_target=targets,
                       max_length=max_target_length, truncation=True)

    if data_args.ignore_pad_token_for_loss:
        labels["input_ids"] = [
            [(l if l != tokenizer.pad_token_id else -100) for l in label] for label in labels["input_ids"]
        ]
    model_inputs["labels"] = labels["input_ids"]

    return model_inputs

我按照您的写法（上述代码）的逻辑写了一个自己的，但是我发现，会报错，显示target和input的batch size的维度必须一样，简单来说就是必须一样长，我的eval的input是instruction +input ，label是 output，这样是否能eval，还是说 input和output都得是instruction+input+output