icemelon9 commented on issue #4324: [Relay] Use opaque for where op URL: https://github.com/apache/incubator-tvm/pull/4324#issuecomment-557727463 @tqchen After some benchmark, I do see there's slightly improvement on the CPU instances. On C5.9xl, with where being opaque, the latency of BERT is 34.51ms (std: 0.59ms), while with where being broadcast, the latency is 36.06ms (std: 0.50ms). The difference is about 1.5ms or 4%. But the difference on C5.4xl is smaller, opaque 46.99ms (std: 0.13ms) vs broadcast 47.87ms (std: 0.24ms), 1.8% improvement. I also evaluate this on GPU instance P3.2xl, which I didn't see much difference in performance. Given the improvement is not very signficant on CPU, I think let's don't make this change for now. In the future, we can potentially have a performance based op fusion pass which it can determin what kind of fusion gives the best performance.
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