Fix two bugs for blank voice (empty speech): (#1403)

jianganghan

2024-02-29 f272eb4ef78e12a1ef4ae451b114f980a2682d51

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import random
 
import numpy as np
import torch
 
 
def set_all_random_seed(seed: int):
    random.seed(seed)
    np.random.seed(seed)
    torch.random.manual_seed(seed)