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5f923cd | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | // Copyright 2025 The ODML Authors.
//
// 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.
#include "runtime/components/constrained_decoding/fake_constraint.h"
#include <memory>
#include "absl/status/status.h" // from @com_google_absl
#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 {
namespace {
// A bitmap implementation that allows only the one specified token.
class SingleAllowedTokenBitmap : public Bitmap {
public:
explicit SingleAllowedTokenBitmap(int allowed_token_id)
: allowed_token_id_(allowed_token_id) {}
bool Get(int index) const override { return index == allowed_token_id_; }
private:
const int allowed_token_id_;
};
} // namespace
std::unique_ptr<Constraint::State> FakeConstraint::Start() const {
return std::make_unique<FakeState>(0);
}
bool FakeConstraint::IsEnded(const State& state) const {
const auto& fake_state = static_cast<const FakeState&>(state);
return fake_state.index() == token_ids_.size();
}
absl::StatusOr<std::unique_ptr<Constraint::State>> FakeConstraint::ComputeNext(
const State& state, int token) const {
const auto& fake_state = static_cast<const FakeState&>(state);
if (fake_state.index() >= token_ids_.size()) {
return absl::InvalidArgumentError("Invalid state");
}
return std::make_unique<FakeState>(fake_state.index() + 1);
}
absl::StatusOr<std::unique_ptr<Bitmap>> FakeConstraint::ComputeBitmap(
const State& state) const {
const auto& fake_state = static_cast<const FakeState&>(state);
return std::make_unique<SingleAllowedTokenBitmap>(
token_ids_[fake_state.index()]);
}
} // namespace litert::lm
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