fix loss normalization for ddp training

haoneng.lhn

2023-12-08 acb9a0fec8d8a4dabeedcbb8e08c26f66d7083f0

 egs/alimeeting/sa_asr/local/alimeeting_process_textgrid.py

@@ -6,7 +6,10 @@
import codecs
from distutils.util import strtobool
from pathlib import Path
import textgrid
try:
    import textgrid
except:
    raise "Please install textgrid firstly: pip install textgrid"
import pdb

class Segment(object):