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[MetaSchedule] MutateTileSize skip single-candidate SampleCategorical #14072

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Merged
merged 1 commit into from
Feb 22, 2023
Merged

[MetaSchedule] MutateTileSize skip single-candidate SampleCategorical #14072

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7 changes: 7 additions & 0 deletions src/meta_schedule/mutator/mutate_tile_size.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -128,6 +128,13 @@ void FindSampleVectorize(const Trace& trace, std::vector<Instruction>* inst,
if (inst->kind.same_as(inst_sample_categorical)) {
ICHECK_EQ(inst->outputs.size(), 1);
if (annotated.count(inst->outputs[0].get())) {
ICHECK_EQ(inst->attrs.size(), 2);
std::vector<double> probs =
support::AsVector<FloatImm, double>(Downcast<Array<FloatImm>>(inst->attrs[1]));
if (probs.size() == 1) {
// Skip mutating the sampling instructions who have only single candidate.
continue;
}
const auto* d = TVM_TYPE_AS(decision, IntImmNode);
instructions.push_back(inst);
decisions.push_back(d->value);
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13 changes: 13 additions & 0 deletions tests/python/unittest/test_meta_schedule_mutator_mutate_tile_size.py
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Expand Up @@ -95,5 +95,18 @@ def test_mutate_tile_size_matmul():
assert len(results) > 15


def test_mutate_sample_categorical_single_candidate():
mutator = _make_mutator(
target=Target("llvm --num-cores=16"),
)
sch = Schedule(matmul, debug_mask="all")
sch.sample_categorical(candidates=[1], probs=[1.0], decision=0)

# The mutator finds the SampleCategorical has only one candidate, and thus skips it.
trace = mutator.apply(sch.trace)
assert trace is None


if __name__ == "__main__":
test_mutate_tile_size_matmul()
test_mutate_sample_categorical_single_candidate()