fix loss normalization for ddp training

haoneng.lhn

2023-12-08 ace42e5043be992c3a324fc637ba0594f10ad3b6

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#Fri Oct 13 14:55:29 CST 2023
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-8.0-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists