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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_FAKE_CONSTRAINT_H_
#define THIRD_PARTY_ODML_LITERT_LM_RUNTIME_COMPONENTS_CONSTRAINED_DECODING_FAKE_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"
namespace litert::lm {
// Constrains the model to produce a fixed sequence of token ids.
class FakeConstraint : public Constraint {
public:
// Represents an index into the `token_ids_` vector.
class FakeState : public Constraint::State {
public:
explicit FakeState(int index) : index_(index) {}
int index() const { return index_; }
private:
const int index_;
};
// `token_ids` is the sequence of tokens IDs the model will be constrained to
// produce.
//
// Note these are token IDs, not the string values of the tokens themselves.
//
// The caller is responsible for ensuring that this sequence is valid -
// specifically, that the IDs are part of the vocabulary of the model this
// constraint is used for, and that the last token is a stop token.
explicit FakeConstraint(std::vector<int> token_ids, int vocabulary_size)
: token_ids_(std::move(token_ids)), vocabulary_size_(vocabulary_size) {}
virtual ~FakeConstraint() = default;
std::unique_ptr<State> Start() const override;
bool IsEnded(const State& state) const override;
int GetVocabularySize() const override { return vocabulary_size_; }
absl::StatusOr<std::unique_ptr<State>> ComputeNext(const State& state,
int token) const override;
absl::StatusOr<std::unique_ptr<Bitmap>> ComputeBitmap(
const State& state) const override;
private:
std::vector<int> token_ids_;
const int vocabulary_size_;
};
} // namespace litert::lm
#endif // THIRD_PARTY_ODML_LITERT_LM_RUNTIME_COMPONENTS_CONSTRAINED_DECODING_FAKE_CONSTRAINT_H_
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