81ceabffc6
Explain that optimizing partially used tuples within a single computation falls out of the existing optimizations. There is still the option to optimize partially used tuples across computations. Will look into that in a separate CL. PiperOrigin-RevId: 315319714 Change-Id: Ifcc41929cb8213cab661ccefea00138e099d551e
64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
/* Copyright 2017 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_TUPLE_SIMPLIFIER_H_
|
|
#define TENSORFLOW_COMPILER_XLA_SERVICE_TUPLE_SIMPLIFIER_H_
|
|
|
|
#include <utility>
|
|
|
|
#include "tensorflow/compiler/xla/service/hlo_instruction.h"
|
|
#include "tensorflow/compiler/xla/service/hlo_module.h"
|
|
#include "tensorflow/compiler/xla/service/hlo_pass_interface.h"
|
|
|
|
namespace xla {
|
|
|
|
// A pass which simplifies patterns of Tuple and GetTupleElement instructions in
|
|
// the module.
|
|
class TupleSimplifier : public HloModulePass {
|
|
public:
|
|
TupleSimplifier() : TupleSimplifier(/*exclude_entry_computation=*/false) {}
|
|
explicit TupleSimplifier(bool exclude_entry_computation);
|
|
~TupleSimplifier() override {}
|
|
absl::string_view name() const override { return "tuple-simplifier"; }
|
|
|
|
// Run tuple simplification on the given computation. Returns whether the
|
|
// computation was changed.
|
|
StatusOr<bool> Run(HloModule* module) override;
|
|
|
|
private:
|
|
// When set, this pipeline stage will perform optimization of all computations
|
|
// apart from the module's entry computation. This is used by Graphcore's
|
|
// backend.
|
|
bool exclude_entry_computation_;
|
|
|
|
// Collapse the following structure into just 'Tuple-shaped Op':
|
|
//
|
|
// Tuple-shaped Op
|
|
// |
|
|
// +-----+-----+
|
|
// | | |
|
|
// GTE GTE GTE
|
|
// | | |
|
|
// +-----+-----+
|
|
// |
|
|
// Tuple
|
|
//
|
|
StatusOr<bool> RemoveWholeTuple(HloInstruction* tuple);
|
|
};
|
|
|
|
} // namespace xla
|
|
|
|
#endif // TENSORFLOW_COMPILER_XLA_SERVICE_TUPLE_SIMPLIFIER_H_
|