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//
// 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 THIRD_PARTY_ODML_LITERT_LM_RUNTIME_COMPONENTS_CONSTRAINED_DECODING_LLG_CONSTRAINT_H_
#define THIRD_PARTY_ODML_LITERT_LM_RUNTIME_COMPONENTS_CONSTRAINED_DECODING_LLG_CONSTRAINT_H_
#include <memory>
#include <utility>
#include <vector>
#include "absl/status/statusor.h" // from @com_google_absl
#include "runtime/components/constrained_decoding/bitmap.h"
#include "runtime/components/constrained_decoding/constraint.h"
#include "llguidance.h"
namespace litert::lm {
class LlgBitmap : public Bitmap {
public:
explicit LlgBitmap(std::vector<bool>&& mask) : mask_(std::move(mask)) {}
bool Get(int index) const override { return mask_[index]; }
private:
const std::vector<bool> mask_;
};
// A wrapper class to own the ::LlgConstraint* pointer from llguidance.h.
class LlgConstraintOwner {
public:
explicit LlgConstraintOwner(::LlgConstraint* llg_constraint)
: llg_constraint_(llg_constraint) {}
~LlgConstraintOwner() { llg_free_constraint(llg_constraint_); }
::LlgConstraint* llg_constraint() const { return llg_constraint_; }
private:
::LlgConstraint* llg_constraint_; // Owned.
};
// Represents a decoding constraint based on the LLGuidance library.
class LlgConstraint : public Constraint {
public:
class LlgState : public State {
public:
// LlgState takes ownership of llg_constraint.
explicit LlgState(::LlgConstraint* llg_constraint) {
llg_constraint_owner_ =
std::make_shared<LlgConstraintOwner>(llg_constraint);
}
::LlgConstraint* llg_constraint() const {
return llg_constraint_owner_->llg_constraint();
}
private:
// The shared_ptr is needed because Constraint::State must be copyable.
std::shared_ptr<LlgConstraintOwner> llg_constraint_owner_;
};
// LlgConstraint takes ownership of llg_constraint.
explicit LlgConstraint(::LlgConstraint* llg_constraint, int vocab_size,
int eos_token_id)
: llg_constraint_owner_(llg_constraint),
vocab_size_(vocab_size),
eos_token_id_(eos_token_id) {}
// Gets the start state of the constraint.
std::unique_ptr<State> Start() const override;
// Returns true if the constraint is at the end state.
bool IsEnded(const State& state) const override;
// Gets the vocabulary size of the constraint.
int GetVocabularySize() const override;
// Computes the next state given the current state and the latest decoded
// token.
absl::StatusOr<std::unique_ptr<State>> ComputeNext(const State& state,
int token) const override;
// Computes the allowed tokens bitmap given the current state.
absl::StatusOr<std::unique_ptr<Bitmap>> ComputeBitmap(
const State& state) const override;
private:
LlgConstraintOwner llg_constraint_owner_;
int vocab_size_;
int eos_token_id_;
};
} // namespace litert::lm
#endif // THIRD_PARTY_ODML_LITERT_LM_RUNTIME_COMPONENTS_CONSTRAINED_DECODING_LLG_CONSTRAINT_H_
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