math.exp can lead to overflow

[tshmak]

Here,

FunASR/funasr/train_utils/trainer.py

Line 690 in bb6018e

f"(ppl_avg_slice: {math.exp(loss_avg_epoch):.3e}), "

math.exp can easily lead to overflow causing unnecessary termination of training. Same with

FunASR/funasr/train_utils/trainer_ds.py

Line 858 in bb6018e

f"(ppl_avg_slice: {math.exp(loss_avg_epoch):.3e}), "