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#pragma once
#include <c10/macros/Export.h>
#include <torch/csrc/jit/codegen/cuda/dispatch.h>
#include <torch/csrc/jit/codegen/cuda/ir_all_nodes.h>
#include <torch/csrc/jit/codegen/cuda/kernel_ir.h>
#include <unordered_set>
namespace torch {
namespace jit {
namespace fuser {
namespace cuda {
//! Detect almost all IterDomains that are derived from trivial
//! reductons.
class TORCH_CUDA_CU_API TrivialReductionInfo {
public:
void build(Fusion* fusion);
bool isDerived(IterDomain* id) const;
private:
//! IterDomains that are derived only from trivial
//! reductons. Included domains are not limited to reduction axes as
//! rfactor can make reductions to normal axes.
//!
//! Note that the set should cover almost all cases but there can be
//! undetected trivial domains. For example, split by one creates a
//! trivial reduction domain, which is detected. However, if it is
//! further split, both of the two resulting axes are also trivial,
//! however, only the inner axis is recognized as trivial. While this
//! is a limitation, it would have very little practical
//! implication.
std::unordered_set<IterDomain*> domains_;
//! Subset of domains_, whose input root axes are all derived from
//! trivial reductions. These domains do not need to manifest as
//! for-loops.
std::unordered_set<IterDomain*> domains_derived_from_root_;
};
} // namespace cuda
} // namespace fuser
} // namespace jit
} // namespace torch
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