fix loss normalization for ddp training

haoneng.lhn

2023-12-08 ace42e5043be992c3a324fc637ba0594f10ad3b6

 runtime/onnxruntime/src/audio.cpp

@@ -1193,7 +1193,7 @@
                }

            }else if(speech_end_i != -1){ // [-1,100]
                if(speech_start == -1 or speech_offline_start == -1){
                if(speech_start == -1 || speech_offline_start == -1){
                    LOG(ERROR) <<"Vad start is null while vad end is available. Set vad start 0" ;
                    speech_start = 0;
                }