Is operator fusing supported when using AutoTVM with GPU?

1. From the [paper](https://arxiv.org/pdf/1802.04799.pdf) it seems that 
operator fusion is happening before AutoTVM (operator fusion is described in 
section 3, while AutoTVM in section 5).

2. There is [answer](https://discuss.tvm.ai/t/questions-on-auto-tuning/1726/8) 
from @eqy on a question regarding auto-tuning, from which I understand that for 
CUDA and OpenCL it is very difficult task. Hence I assume such fusing is not 
supported.

3. In AutoTVM source (e.g. 
https://github.com/dmlc/tvm/blob/master/topi/python/topi/cuda/conv2d.py#L119) 
decorators appear to be only for non-fused operations.

So how this actually is with this operator fusing?





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Tianqi Chen, UW, Seattle, WA, 98105, United States
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