kaivalnp commented on code in PR #14178: URL: https://github.com/apache/lucene/pull/14178#discussion_r1955595482
########## lucene/sandbox/src/java22/org/apache/lucene/sandbox/codecs/faiss/LibFaissC.java: ########## @@ -0,0 +1,457 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.lucene.sandbox.codecs.faiss; + +import static java.lang.foreign.ValueLayout.ADDRESS; +import static java.lang.foreign.ValueLayout.JAVA_FLOAT; +import static java.lang.foreign.ValueLayout.JAVA_INT; +import static java.lang.foreign.ValueLayout.JAVA_LONG; + +import java.io.IOException; +import java.lang.foreign.Arena; +import java.lang.foreign.FunctionDescriptor; +import java.lang.foreign.Linker; +import java.lang.foreign.MemoryLayout; +import java.lang.foreign.MemorySegment; +import java.lang.foreign.SymbolLookup; +import java.lang.invoke.MethodHandle; +import java.lang.invoke.MethodHandles; +import java.lang.invoke.MethodType; +import java.nio.ByteOrder; +import java.nio.FloatBuffer; +import java.nio.LongBuffer; +import java.util.Locale; +import org.apache.lucene.index.FloatVectorValues; +import org.apache.lucene.index.KnnVectorValues; +import org.apache.lucene.index.VectorSimilarityFunction; +import org.apache.lucene.search.KnnCollector; +import org.apache.lucene.store.IndexInput; +import org.apache.lucene.store.IndexOutput; +import org.apache.lucene.util.Bits; +import org.apache.lucene.util.FixedBitSet; +import org.apache.lucene.util.hnsw.IntToIntFunction; + +public final class LibFaissC { + /* + * TODO: Requires some changes to Faiss + * - https://github.com/facebookresearch/faiss/pull/4158 (merged in main, to be released in v1.11.0) + * - https://github.com/facebookresearch/faiss/pull/4167 (merged in main, to be released in v1.11.0) + * - https://github.com/facebookresearch/faiss/pull/4180 (in progress) + */ + + public static final String LIBRARY_NAME = "faiss_c"; + public static final String LIBRARY_VERSION = "1.10.0"; + + static { + try { + System.loadLibrary(LIBRARY_NAME); + } catch (UnsatisfiedLinkError e) { + throw new RuntimeException( + "Shared library not found, build the Faiss C_API from https://github.com/facebookresearch/faiss/blob/main/c_api/INSTALL.md " + + "and link it (along with all dependencies) to the library path " + + "(-Djava.library.path JVM argument or $LD_LIBRARY_PATH environment variable)", + e); + } + checkLibraryVersion(); + } + + private LibFaissC() {} + + @SuppressWarnings("SameParameterValue") + private static MemorySegment getUpcallStub( + Arena arena, MethodHandle target, MemoryLayout resLayout, MemoryLayout... argLayouts) { + return Linker.nativeLinker() + .upcallStub(target, FunctionDescriptor.of(resLayout, argLayouts), arena); + } + + private static MethodHandle getDowncallHandle( + String functionName, MemoryLayout resLayout, MemoryLayout... argLayouts) { + return Linker.nativeLinker() + .downcallHandle( + SymbolLookup.loaderLookup().find(functionName).orElseThrow(), + FunctionDescriptor.of(resLayout, argLayouts)); + } + + private static void checkLibraryVersion() { + MethodHandle getVersion = getDowncallHandle("faiss_get_version", ADDRESS); + String actualVersion = callAndGetString(getVersion); + if (LIBRARY_VERSION.equals(actualVersion) == false) { + throw new UnsupportedOperationException( + String.format( + Locale.ROOT, + "Expected Faiss library version %s, found %s", + LIBRARY_VERSION, + actualVersion)); + } + } + + private static final MethodHandle FREE_INDEX = + getDowncallHandle("faiss_Index_free", JAVA_INT, ADDRESS); + + public static void freeIndex(MemorySegment indexPointer) { + callAndHandleError(FREE_INDEX, indexPointer); + } + + private static final MethodHandle FREE_CUSTOM_IO_WRITER = + getDowncallHandle("faiss_CustomIOWriter_free", JAVA_INT, ADDRESS); + + public static void freeCustomIOWriter(MemorySegment customIOWriterPointer) { + callAndHandleError(FREE_CUSTOM_IO_WRITER, customIOWriterPointer); + } + + private static final MethodHandle FREE_CUSTOM_IO_READER = + getDowncallHandle("faiss_CustomIOReader_free", JAVA_INT, ADDRESS); + + public static void freeCustomIOReader(MemorySegment customIOReaderPointer) { + callAndHandleError(FREE_CUSTOM_IO_READER, customIOReaderPointer); + } + + private static final MethodHandle FREE_PARAMETER_SPACE = + getDowncallHandle("faiss_ParameterSpace_free", JAVA_INT, ADDRESS); + + private static void freeParameterSpace(MemorySegment parameterSpacePointer) { + callAndHandleError(FREE_PARAMETER_SPACE, parameterSpacePointer); + } + + private static final MethodHandle FREE_ID_SELECTOR_BITMAP = + getDowncallHandle("faiss_IDSelectorBitmap_free", JAVA_INT, ADDRESS); + + private static void freeIDSelectorBitmap(MemorySegment idSelectorBitmapPointer) { + callAndHandleError(FREE_ID_SELECTOR_BITMAP, idSelectorBitmapPointer); + } + + private static final MethodHandle FREE_SEARCH_PARAMETERS = + getDowncallHandle("faiss_SearchParameters_free", JAVA_INT, ADDRESS); + + private static void freeSearchParameters(MemorySegment searchParametersPointer) { + callAndHandleError(FREE_SEARCH_PARAMETERS, searchParametersPointer); + } + + private static final MethodHandle INDEX_FACTORY = + getDowncallHandle("faiss_index_factory", JAVA_INT, ADDRESS, JAVA_INT, ADDRESS, JAVA_INT); + + private static final MethodHandle PARAMETER_SPACE_NEW = + getDowncallHandle("faiss_ParameterSpace_new", JAVA_INT, ADDRESS); + + private static final MethodHandle SET_INDEX_PARAMETERS = + getDowncallHandle( + "faiss_ParameterSpace_set_index_parameters", JAVA_INT, ADDRESS, ADDRESS, ADDRESS); + + private static final MethodHandle ID_SELECTOR_BITMAP_NEW = + getDowncallHandle("faiss_IDSelectorBitmap_new", JAVA_INT, ADDRESS, JAVA_LONG, ADDRESS); + + private static final MethodHandle SEARCH_PARAMETERS_NEW = + getDowncallHandle("faiss_SearchParameters_new", JAVA_INT, ADDRESS, ADDRESS); + + private static final MethodHandle INDEX_IS_TRAINED = + getDowncallHandle("faiss_Index_is_trained", JAVA_INT, ADDRESS); + + private static final MethodHandle INDEX_TRAIN = + getDowncallHandle("faiss_Index_train", JAVA_INT, ADDRESS, JAVA_LONG, ADDRESS); + + private static final MethodHandle INDEX_ADD_WITH_IDS = + getDowncallHandle("faiss_Index_add_with_ids", JAVA_INT, ADDRESS, JAVA_LONG, ADDRESS, ADDRESS); + + public static MemorySegment createIndex( + String description, + String indexParams, + VectorSimilarityFunction function, + FloatVectorValues floatVectorValues, + IntToIntFunction oldToNewDocId) + throws IOException { + + try (Arena temp = Arena.ofConfined()) { + int size = floatVectorValues.size(); + int dimension = floatVectorValues.dimension(); + + // Mapped from faiss/MetricType.h + int metric = + switch (function) { + case DOT_PRODUCT -> 0; Review Comment: Makes sense, because the relative ordering will still remain the same as the [original function](https://github.com/apache/lucene/blob/de8e3785832b8d1aafe7e231bda30c6d23219473/lucene/core/src/java/org/apache/lucene/index/VectorSimilarityFunction.java#L87-L90) -- I'll add this in the next commit One question I have with this PR is whether we should scale the scores as Lucene does (e.g. `1 / (1 + squareDistance` for [euclidean](https://github.com/apache/lucene/blob/de8e3785832b8d1aafe7e231bda30c6d23219473/lucene/core/src/java/org/apache/lucene/index/VectorSimilarityFunction.java#L33-L36)) for parity with other KNN formats (which we aren't doing right now) -- This is an automated message from the Apache Git Service. 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