33 lines
991 B
C++
33 lines
991 B
C++
// Copyright (c) 2021 Mobvoi Inc (Zhendong Peng)
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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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// http://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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#include "utils/utils.h"
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#include <algorithm>
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#include <cmath>
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#include "utils/log.h"
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namespace wenet {
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float LogAdd(float x, float y) {
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static float num_min = -std::numeric_limits<float>::max();
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if (x <= num_min) return y;
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if (y <= num_min) return x;
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float xmax = std::max(x, y);
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return std::log(std::exp(x - xmax) + std::exp(y - xmax)) + xmax;
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}
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} // namespace wenet
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