在使用ms-swift3.1的时候，自定义数据集的方式出错

[corkiyao]

Describe the bug
What the bug is, and how to reproduce, better with screenshots(描述bug以及复现过程，最好有截图)
[采用]https://github.com/modelscope/ms-swift/blob/main/examples/notebook/qwen2_5-self-cognition/self-cognition-sft.ipynb这里的微调代码，发现在加载数据集路径出错。

import os
os.environ['CUDA_VISIBLE_DEVICES'] = '0'

from swift.llm import (
    get_model_tokenizer, load_dataset, get_template, EncodePreprocessor, get_model_arch,
    get_multimodal_target_regex, LazyLLMDataset
)
from swift.utils import get_logger, get_model_parameter_info, plot_images, seed_everything
from swift.tuners import Swift, LoraConfig
from swift.trainers import Seq2SeqTrainer, Seq2SeqTrainingArguments
from functools import partial

logger = get_logger()
seed_everything(42)

# model
model_id_or_path = './ms-swift/Internvl25_1B'
model_type = 'internvl2_5'
system = None  # 使用template中定义的默认system
output_dir = 'output/InternVL2_5-1B'

# dataset
dataset = ['./ms-swift/Datasets/Jsonfile/train__swift.jsonl']  # dataset_id或者dataset_path。
data_seed = 42
max_length = 8192
split_dataset_ratio = 0.01  # 切分验证集的比例
num_proc = 4  # 数据处理的进程数
strict = False

# lora
lora_rank = 8
lora_alpha = 8
freeze_llm = False
freeze_vit = True
freeze_aligner = True
.................
.................

Your hardware and system info
Write your system info like CUDA version/system/GPU/torch version here(在这里给出硬件信息和系统信息，如CUDA版本，系统，GPU型号和torch版本等)

ms-swift3.1版本

Additional context
Add any other context about the problem here(在这里补充其他信息)
bug

  File "./ms-swift/internvl_251B.py", line 88, in <module>
    train_dataset, val_dataset = load_dataset(dataset, split_dataset_ratio=split_dataset_ratio, num_proc=num_proc,
  File "./ms-swift/swift/llm/dataset/loader.py", line 468, in load_dataset
    train_dataset = load_function(dataset_syntax, dataset_meta, **load_kwargs)
  File "./ms-swift/swift/llm/dataset/loader.py", line 363, in load
    dataset = DatasetLoader._load_dataset_path(
  File "./ms-swift/swift/llm/dataset/loader.py", line 197, in _load_dataset_path
    dataset = hf_load_dataset(file_type, data_files=dataset_path, **kwargs)
  File "./anaconda3/envs/swift/lib/python3.10/site-packages/datasets/load.py", line 2151, in load_dataset
    builder_instance.download_and_prepare(
  File "./anaconda3/envs/swift/lib/python3.10/site-packages/datasets/builder.py", line 924, in download_and_prepare
    self._download_and_prepare(
  File "./anaconda3/envs/swift/lib/python3.10/site-packages/datasets/builder.py", line 1000, in _download_and_prepare
    self._prepare_split(split_generator, **prepare_split_kwargs)
  File "./anaconda3/envs/swift/lib/python3.10/site-packages/datasets/builder.py", line 1741, in _prepare_split
    for job_id, done, content in self._prepare_split_single(
  File "./anaconda3/envs/swift/lib/python3.10/site-packages/datasets/builder.py", line 1897, in _prepare_split_single
    raise DatasetGenerationError("An error occurred while generating the dataset") from e
datasets.exceptions.DatasetGenerationError: An error occurred while generating the dataset

出现了这个问题，然后我的jsonl文件里面的东西为

{"messages": [{"role": "system", "content": "You are a helpful assistant."}, {"role": "user", "content": "<image>检测出图像中的<ref-object>，并提供每个物体的目标框坐标。"}, {"role": "assistant", "content": "<bbox></bbox>"}], "images": ["./ms-swift/Datasets/Traffic/15/1555.jpg"], "objects": {"ref": ["某物体"], "bbox": [[371, 648, 450, 758]]}}