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对于张量运算应尽量避免使用循环,原版的 model_norm 函数 (i.e. 计算两个模型之间的欧式距离) 使用 for 实现,导致效率偏低且可读性差。为此我们优化了原版 model_norm 方法,增强了可读性且运行效率提高了一倍,若在 GPU 环境之中运行代码, 性能提升会更加显著。