junrushao1994 commented on a change in pull request #8817:
URL: https://github.com/apache/tvm/pull/8817#discussion_r694385534
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File path: src/tir/schedule/primitive.h
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@@ -19,12 +19,26 @@
#ifndef TVM_TIR_SCHEDULE_PRIMITIVE_H_
#define TVM_TIR_SCHEDULE_PRIMITIVE_H_
+#include <tvm/support/random_engine.h>
#include <tvm/tir/schedule/state.h>
namespace tvm {
namespace tir {
/******** Schedule: Sampling ********/
+/*!
+ * \brief Sample once category from candidates according to the probability
weights.
+ * \param self The schedule to update
+ * \param rand_state The pointer to schedule's random state
+ * \param candidates The candidates
+ * \param probs The probability distribution of the candidates
+ * \param decision The sampling decision, if any
+ * \return The random variable sampled from candidates
+ */
+TVM_DLL int64_t
SampleCategorical(support::LinearCongruentialEngine::TRandState* rand_state,
+ const Array<Integer>& candidates, const
Array<FloatImm>& probs,
+ Optional<Integer>* decision);
Review comment:
All the sampling primitives in meta schedule modifies the `decision`
passed in to reflect which decision is being made inside the method. This
includes:
- SamplePerfectTile
- SampleCategorical
- SampleComputeLocation
Without knowing what the decisions are, we are unable to exactly reproduce a
trace which comes with randomness.
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