perplexity 微调之后变大了？需要继续微调？

[cqray1990]

微调之前估计效果：
***** eval metrics *****
eval_loss = 2.5866
eval_runtime = 0:02:10.44
eval_samples = 1000
eval_samples_per_second = 7.666
eval_steps_per_second = 0.958
perplexity = 13.2845

sft 微调之后的估计效果，perplexity 怎么还变大了

***** eval metrics *****
epoch = 2.0
eval_loss = 2.8984
eval_runtime = 0:00:00.33
eval_samples = 10
eval_samples_per_second = 29.506
eval_steps_per_second = 2.951
perplexity = 18.1445

[shibing624]

建议：
1.训练集质量不高，提升数据质量；
2.lr 调低
3.batch size调大