wehub-resource-sync
75 lines
3.1 KiB
Plaintext
75 lines
3.1 KiB
Plaintext
// Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
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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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#pragma once
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namespace phi {
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template <typename MT>
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__device__ __forceinline__ void ComputeWeightsSpan(const int i,
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const int input_size,
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const MT scale,
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const MT support,
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int* xmin,
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int* xsize,
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MT* center) {
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*center = scale * (i + static_cast<MT>(0.5));
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*xmin = max(static_cast<int>(*center - support + static_cast<MT>(0.5)), 0);
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*xsize = min(static_cast<int>(*center + support + static_cast<MT>(0.5)),
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input_size) -
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*xmin;
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}
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// Compute single weight on-the-fly without storing all weights
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// This is used when shared memory is insufficient for large ratio values
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template <typename MT, typename InterpFilter>
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__device__ __forceinline__ MT ComputeSingleWeight(const MT scale,
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const InterpFilter& filter,
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const MT xmin_m_center,
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int idx) {
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MT invscale = (scale >= 1.0) ? 1.0 / scale : 1.0;
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return filter((idx + xmin_m_center + static_cast<MT>(0.5)) * invscale);
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}
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// Compute weight normalization factor (sum of all weights)
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template <typename MT, typename InterpFilter>
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__device__ __forceinline__ MT ComputeWeightSum(const MT scale,
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const InterpFilter& filter,
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const MT xmin_m_center,
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int xsize) {
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MT invscale = (scale >= 1.0) ? 1.0 / scale : 1.0;
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MT total_w = 0.0;
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for (int j = 0; j < xsize; j++) {
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total_w += filter((j + xmin_m_center + static_cast<MT>(0.5)) * invscale);
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}
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return total_w;
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}
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// Compute single normalized weight for backward pass on-the-fly
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template <typename MT, typename InterpFilter>
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__device__ __forceinline__ MT
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ComputeSingleWeightBwNormalized(const MT scale,
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const InterpFilter& filter,
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const MT xmin_m_center,
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int idx,
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const MT total_w) {
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MT invscale = (scale >= 1.0) ? 1.0 / scale : 1.0;
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MT w = filter((idx + xmin_m_center + static_cast<MT>(0.5)) * invscale);
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if (total_w != 0.0) {
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w /= total_w;
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}
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return w;
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}
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} // namespace phi
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