mirror of https://github.com/google/gemma.cpp.git
52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
// Copyright 2024 Google LLC
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// SPDX-License-Identifier: Apache-2.0
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_GEMMA_CPP_OPS_OPS_H_
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#define THIRD_PARTY_GEMMA_CPP_OPS_OPS_H_
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#include <stddef.h>
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#include <cmath>
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#include "util/mat.h"
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#include "hwy/base.h"
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namespace gcpp {
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static inline HWY_MAYBE_UNUSED MatStorageT<float> CreateInvTimescale(
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const Allocator& allocator, size_t qkv_dim, bool half_rope,
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double base_frequency = 10000.0) {
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const size_t rope_dim = half_rope ? qkv_dim / 2 : qkv_dim;
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MatStorageT<float> inv_timescale("inv_timescale", rope_dim / 2, allocator);
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for (size_t dim = 0; dim < rope_dim / 2; ++dim) {
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const double freq_exponents =
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static_cast<double>(2 * dim) / static_cast<double>(rope_dim);
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// Replacing with expf(ln(1E4) * freq_exponents) changes results
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// noticeably.
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inv_timescale.Row(0)[dim] =
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static_cast<float>(1.0 / std::pow(base_frequency, freq_exponents));
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}
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return inv_timescale;
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}
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struct SMOptions {
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float* HWY_RESTRICT max_out = nullptr;
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float* HWY_RESTRICT d_out = nullptr;
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};
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} // namespace gcpp
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#endif // THIRD_PARTY_GEMMA_CPP_OPS_OPS_H_
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