fix GPU search (#2455)

Signed-off-by: Nshengjun.li <shengjun.li@zilliz.com>

CHANGELOG.md

@@ -9,6 +9,7 @@ Please mark all change in change log and use the issue from GitHub
 -   \#2395 Fix large nq cudaMalloc error
 -   \#2399 The nlist set by the user may not take effect
 -   \#2403 MySQL max_idle_time is 10 by default
+-   \#2450 The deleted vectors may be found on GPU
 
 ## Feature
 

core/src/index/thirdparty/faiss/gpu/impl/IVFUtilsSelect1.cu

@@ -75,10 +75,9 @@ pass1SelectLists(void** listIndices,
                          topQueryToCentroid,
                          opt);
     if (bitsetEmpty || (!(bitset[index >> 3] & (0x1 << (index & 0x7))))) {
-      heap.add(distanceStart[i], start + i);
-    } else {
-      heap.add((1.0 / 0.0), start + i);
+      heap.addThreadQ(distanceStart[i], start + i);
     }
+    heap.checkThreadQ();
   }
 
   // Handle warp divergence separately
@@ -91,8 +90,6 @@ pass1SelectLists(void** listIndices,
                          opt);
     if (bitsetEmpty || (!(bitset[index >> 3] & (0x1 << (index & 0x7))))) {
       heap.addThreadQ(distanceStart[i], start + i);
-    } else {
-      heap.addThreadQ((1.0 / 0.0), start + i);
     }
   }
 

core/src/index/thirdparty/faiss/gpu/impl/L2Select.cu

@@ -156,22 +156,17 @@ __global__ void l2SelectMinK(Tensor<T, 2, true> productDistances,
     if (bitsetEmpty || (!(bitset[i >> 3] & (0x1 << (i & 0x7))))) {
       v = Math<T>::add(centroidDistances[i],
                         productDistances[row][i]);
-    } else {
-      v = (T)(1.0 / 0.0);
+      heap.addThreadQ(v, i);
     }
-      
-    heap.add(v, i);
+    heap.checkThreadQ();
   }
 
   if (i < productDistances.getSize(1)) {
     if (bitsetEmpty || (!(bitset[i >> 3] & (0x1 << (i & 0x7))))) {
       v = Math<T>::add(centroidDistances[i],
                         productDistances[row][i]);
-    } else {
-      v = (T)(1.0 / 0.0);
+      heap.addThreadQ(v, i);
     }
-
-    heap.addThreadQ(v, i);
   }
 
   heap.reduce();

core/src/index/thirdparty/faiss/gpu/utils/BlockSelectKernel.cuh

@@ -146,11 +146,10 @@ __global__ void blockSelect(Tensor<K, 2, true> in,
 
   for (; i < limit; i += ThreadsPerBlock) {
     if (bitsetEmpty || (!(bitset[i >> 3] & (0x1 << (i & 0x7))))) {
-      heap.add(*inStart, (IndexType) i);
-    } else {
-      heap.add(-1.0, (IndexType) i);
+      heap.addThreadQ(*inStart, (IndexType) i);
     }
-      
+    heap.checkThreadQ();
+
     inStart += ThreadsPerBlock;
   }
 
@@ -158,8 +157,6 @@ __global__ void blockSelect(Tensor<K, 2, true> in,
   if (i < in.getSize(1)) {
     if (bitsetEmpty || (!(bitset[i >> 3] & (0x1 << (i & 0x7))))) {
       heap.addThreadQ(*inStart, (IndexType) i);
-    } else {
-      heap.addThreadQ(-1.0, (IndexType) i);
     }
   }
 
@@ -208,10 +205,9 @@ __global__ void blockSelectPair(Tensor<K, 2, true> inK,
 
   for (; i < limit; i += ThreadsPerBlock) {
     if (bitsetEmpty || (!(bitset[i >> 3] & (0x1 << (i & 0x7))))) {
-      heap.add(*inKStart, *inVStart);
-    } else {
-      heap.add(-1.0, *inVStart);
+      heap.addThreadQ(*inKStart, *inVStart);
     }
+    heap.checkThreadQ();
 
     inKStart += ThreadsPerBlock;
     inVStart += ThreadsPerBlock;
@@ -221,8 +217,6 @@ __global__ void blockSelectPair(Tensor<K, 2, true> inK,
   if (i < inK.getSize(1)) {
     if (bitsetEmpty || (!(bitset[i >> 3] & (0x1 << (i & 0x7))))) {
       heap.addThreadQ(*inKStart, *inVStart);
-    } else {
-      heap.addThreadQ(-1.0, *inVStart);
     }
   }
 

core/src/scheduler/task/SearchTask.cpp

@@ -283,15 +283,6 @@ XSearchTask::Execute() {
 
                 {
                     std::unique_lock<std::mutex> lock(search_job->mutex());
-
-                    if (search_job->GetResultIds().size() > spec_k) {
-                        if (search_job->GetResultIds().front() == -1) {
-                            // initialized results set
-                            search_job->GetResultIds().resize(spec_k * nq);
-                            search_job->GetResultDistances().resize(spec_k * nq);
-                        }
-                    }
-
                     search_job->vector_count() = nq;
                     XSearchTask::MergeTopkToResultSet(output_ids, output_distance, spec_k, nq, topk, ascending_reduce,
                                                       search_job->GetResultIds(), search_job->GetResultDistances());