tensorflow_lite_support/custom_ops/kernel/sentencepiece/sentencepiece_constants.h

/* Copyright 2020 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_LITE_SUPPORT_CUSTOM_OPS_KERNEL_SENTENCEPIECE_SENTENCEPIECE_CONSTANTS_H_
#define TENSORFLOW_LITE_SUPPORT_CUSTOM_OPS_KERNEL_SENTENCEPIECE_SENTENCEPIECE_CONSTANTS_H_

namespace tflite {
namespace ops {
namespace custom {
namespace sentencepiece {

// The constant is copied from
// https://github.com/google/sentencepiece/blob/master/src/unigram_model.cc
constexpr float kUnkPenalty = 10.0;

// These constants are copied from
// https://github.com/google/sentencepiece/blob/master/src/sentencepiece_processor.cc
//
// Replaces white space with U+2581 (LOWER ONE EIGHT BLOCK).
constexpr char kSpaceSymbol[] = "\xe2\x96\x81";

// Encodes <unk> into U+2047 (DOUBLE QUESTION MARK),
// since this character can be useful both for user and
// developer. We can easily figure out that <unk> is emitted.
constexpr char kDefaultUnknownSymbol[] = " \xE2\x81\x87 ";

}  // namespace sentencepiece
}  // namespace custom
}  // namespace ops
}  // namespace tflite

#endif  // TENSORFLOW_LITE_SUPPORT_CUSTOM_OPS_KERNEL_SENTENCEPIECE_SENTENCEPIECE_CONSTANTS_H_