fix loss normalization for ddp training

haoneng.lhn

2023-12-08 ace42e5043be992c3a324fc637ba0594f10ad3b6

 egs_modelscope/speaker_verification/speech_xvector_sv-en-us-callhome-8k-spk6135-pytorch/infer_sv.py

@@ -4,7 +4,7 @@
if __name__ == '__main__':
    inference_sv_pipline = pipeline(
        task=Tasks.speaker_verification,
        model='speech_xvector_sv-en-us-callhome-8k-spk6135-pytorch'
        model='damo/speech_xvector_sv-en-us-callhome-8k-spk6135-pytorch'
    )

    # the same speaker