[Bug] CLUEWSC的测试结果全是 50%

Prerequisite

• I have searched Issues and Discussions but cannot get the expected help.
• The bug has not been fixed in the latest version.

Type

I'm evaluating with the officially supported tasks/models/datasets.

Environment

使用的版本是 0.2.3

Reproduces the problem - code/configuration sample

python3 ${OPENCOMPASS_PATH}/run.py --work-dir ${OPENCOMPASS_PATH} \
    --datasets FewCLUE_cluewsc_ppl \
    --hf-path ${model_path} \
    --config-dir ${OPENCOMPASS_PATH}/configs \
    --model-kwargs device_map='auto' trust_remote_code=True \
    --tokenizer-kwargs padding_side='right' truncation='left' trust_remote_code=True add_special_tokens=False \
    --max-seq-len 4096 \
    --max-out-len 100 \
    --batch-size 1  \
    --reuse results/${model_name} \
    --num-gpus 8

Reproduces the problem - command or script

python3 ${OPENCOMPASS_PATH}/run.py --work-dir ${OPENCOMPASS_PATH} \
    --datasets FewCLUE_cluewsc_ppl \
    --hf-path ${model_path} \
    --config-dir ${OPENCOMPASS_PATH}/configs \
    --model-kwargs device_map='auto' trust_remote_code=True \
    --tokenizer-kwargs padding_side='right' truncation='left' trust_remote_code=True add_special_tokens=False \
    --max-seq-len 4096 \
    --max-out-len 100 \
    --batch-size 1  \
    --reuse results/${model_name} \
    --num-gpus 8

Reproduces the problem - error message

我测试了 Qwen1.5-1.8B, Gemma-2b, rwkv-5-world-1b5 和 MiniCPM-2B-sft-fp32。结果是：
50.31/50.31/50.31/52.20
这个结果和瞎猜没区别。而且这个任务不能选择 few-shot，我理解应该任意任务都可以设置 few-shot 而不是像现在这种每个任务是写死的？

Other information

No response