c9b76de37e
Add a special case for the degenerate n=1 case of Cholesky decomposition. PiperOrigin-RevId: 329317576 Change-Id: Ia6a2567576286fbf04fff2b050f1870946f907e2
49 lines
1.7 KiB
C++
49 lines
1.7 KiB
C++
/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
==============================================================================*/
|
|
|
|
#ifndef TENSORFLOW_COMPILER_XLA_SERVICE_CHOLESKY_EXPANDER_H_
|
|
#define TENSORFLOW_COMPILER_XLA_SERVICE_CHOLESKY_EXPANDER_H_
|
|
|
|
#include "absl/container/flat_hash_map.h"
|
|
#include "tensorflow/compiler/xla/client/xla_builder.h"
|
|
#include "tensorflow/compiler/xla/service/op_expander_pass.h"
|
|
|
|
namespace xla {
|
|
|
|
class CholeskyExpander : public OpExpanderPass {
|
|
public:
|
|
absl::string_view name() const override { return "cholesky_expander"; }
|
|
|
|
protected:
|
|
bool InstructionMatchesPattern(HloInstruction* instruction) override;
|
|
|
|
StatusOr<HloInstruction*> ExpandInstruction(
|
|
HloInstruction* instruction) override;
|
|
|
|
virtual StatusOr<std::pair<XlaOp, XlaOp>> CholeskyUnblocked(
|
|
XlaOp a, PrecisionConfig::Precision precision);
|
|
|
|
private:
|
|
XlaOp BuildCholesky(XlaOp a, int64 block_size,
|
|
PrecisionConfig::Precision precision);
|
|
|
|
// Mapping from op signatures to existing computations.
|
|
absl::flat_hash_map<string, HloComputation*> computation_cache_;
|
|
};
|
|
|
|
} // namespace xla
|
|
|
|
#endif // TENSORFLOW_COMPILER_XLA_SERVICE_CHOLESKY_EXPANDER_H_
|