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<div class="title">IVFUtils.cu</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment"></span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/**</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * All rights reserved.</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * This source code is licensed under the CC-by-NC license found in the</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// Copyright 2004-present Facebook. All Rights Reserved.</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "IVFUtils.cuh"</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "../utils/DeviceUtils.h"</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "../utils/StaticUtils.h"</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include "../utils/Tensor.cuh"</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "../utils/ThrustAllocator.cuh"</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <thrust/scan.h></span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <thrust/execution_policy.h></span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">namespace </span>faiss { <span class="keyword">namespace </span>gpu {</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// Calculates the total number of intermediate distances to consider</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// for all queries</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> __global__ <span class="keywordtype">void</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> getResultLengths(Tensor<int, 2, true> topQueryToCentroid,</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordtype">int</span>* listLengths,</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordtype">int</span> totalSize,</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  Tensor<int, 2, true> length) {</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordtype">int</span> linearThreadId = blockIdx.x * blockDim.x + threadIdx.x;</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">if</span> (linearThreadId >= totalSize) {</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  }</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordtype">int</span> nprobe = topQueryToCentroid.getSize(1);</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordtype">int</span> queryId = linearThreadId / nprobe;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordtype">int</span> listId = linearThreadId % nprobe;</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordtype">int</span> centroidId = topQueryToCentroid[queryId][listId];</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="comment">// Safety guard in case NaNs in input cause no list ID to be generated</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  length[queryId][listId] = (centroidId != -1) ? listLengths[centroidId] : 0;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> }</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="keywordtype">void</span> runCalcListOffsets(Tensor<int, 2, true>& topQueryToCentroid,</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  thrust::device_vector<int>& listLengths,</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  Tensor<int, 2, true>& prefixSumOffsets,</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  Tensor<char, 1, true>& thrustMem,</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  cudaStream_t stream) {</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  FAISS_ASSERT(topQueryToCentroid.getSize(0) == prefixSumOffsets.getSize(0));</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  FAISS_ASSERT(topQueryToCentroid.getSize(1) == prefixSumOffsets.getSize(1));</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordtype">int</span> totalSize = topQueryToCentroid.numElements();</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordtype">int</span> numThreads = std::min(totalSize, getMaxThreadsCurrentDevice());</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">int</span> numBlocks = utils::divUp(totalSize, numThreads);</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keyword">auto</span> grid = dim3(numBlocks);</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">auto</span> block = dim3(numThreads);</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  getResultLengths<<<grid, block, 0, stream>>>(</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  topQueryToCentroid,</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  listLengths.data().get(),</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  totalSize,</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  prefixSumOffsets);</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="comment">// Prefix sum of the indices, so we know where the intermediate</span></div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// results should be maintained</span></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="comment">// Thrust wants a place for its temporary allocations, so provide</span></div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="comment">// one, so it won't call cudaMalloc/Free</span></div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  GpuResourcesThrustAllocator alloc(thrustMem.data(),</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  thrustMem.getSizeInBytes());</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  thrust::inclusive_scan(thrust::cuda::par(alloc).on(stream),</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  prefixSumOffsets.data(),</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  prefixSumOffsets.data() + totalSize,</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  prefixSumOffsets.data());</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> }</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> } } <span class="comment">// namespace</span></div>
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