camera.position.z = 40;
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，这一点在PDF资料中也有详细论述
Look, robot beaver Avatar is already a bizarro concept. But Chong and Andrews take it to wild new heights in the film's third act, which is chaos incarnate. No spoilers, but a sweet-spoken shark named Diane (voiced by Vanessa Bayer) and the Insect Queen's tyrannical spawn Titus (voiced by Dave Franco) get involved, each in ways that are equal parts hilarious and unsettling. I could not stop thinking, "I'm obsessed that I'm seeing this in a Pixar movie."，更多细节参见快连官网
查看模型结构发现，模型中耗时的 Mul 和 ReduceSum 都处于这样的子结构中，所以我们主要是对这个结构进行性能优化。