configs.h

// Copyright 2024 Google LLC
// SPDX-License-Identifier: Apache-2.0
//
// 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
//
//     https://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.

// Model configurations

#ifndef THIRD_PARTY_GEMMA_CPP_CONFIGS_H_
#define THIRD_PARTY_GEMMA_CPP_CONFIGS_H_

// Allow changing pre-allocated kv cache size as a compiler flag
#ifndef GEMMA_MAX_SEQLEN
#define GEMMA_MAX_SEQLEN 4096
#endif  // !GEMMA_MAX_SEQLEN

// Allow changing k parameter of `SampleTopK` as a compiler flag
#ifndef GEMMA_TOPK
#define GEMMA_TOPK 1
#endif  // !GEMMA_TOPK

#include <stddef.h>

namespace gcpp {

static constexpr size_t kSeqLen = GEMMA_MAX_SEQLEN;
static constexpr size_t kTopK = GEMMA_TOPK;

struct ConfigGemma7B {
  static constexpr int kSeqLen = gcpp::kSeqLen;
  static constexpr int kVocabSize = 256128;
  static constexpr int kLayers = 28;
  static constexpr int kModelDim = 3072;
  static constexpr int kFFHiddenDim = 16 * 3072 / 2;  // = 24576
  static constexpr int kHeads = 16;
  static constexpr int kKVHeads = 16;  // standard MHA
  static constexpr int kQKVDim = 256;  // query size == key size == value size
  static constexpr int kTopK = gcpp::kTopK;
};

struct ConfigGemma2B {
  static constexpr int kSeqLen = gcpp::kSeqLen;
  static constexpr int kVocabSize = 256128;
  static constexpr int kLayers = 18;
  static constexpr int kModelDim = 2048;
  static constexpr int kFFHiddenDim = 16 * 2048 / 2;  // = 16384
  static constexpr int kHeads = 8;
  static constexpr int kKVHeads = 8;   // TODO(austinvhuang): add MQA support
  static constexpr int kQKVDim = 256;  // query size == key size == value size
  static constexpr int kTopK = gcpp::kTopK;
};

}  // namespace gcpp

#endif  // THIRD_PARTY_GEMMA_CPP_CONFIGS_H_