ghostplant edited a comment on issue #4547: CUDA source emited from hybrid script contains undefined `vthread` URL: https://github.com/apache/incubator-tvm/issues/4547#issuecomment-568362640 I think there is an undetermined way to decide whether we need to bind an axis to `vthread`. Sometimes we cannot bind it because it is possible to result in `// attr [iter_var(vthread, , vthread)] thread_extent = 2` in lower code. Sometimes we have to bind it because lacking it might result in `invalid argument number like: float *input0, float *output, int outer_i` for a kernel in its lower code, which is not transformed into a loop.
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