ydb-platform · Gazizonoki · Aug 2, 2024 · Aug 1, 2024
diff --git a/examples/vector_index/CMakeLists.txt b/examples/vector_index/CMakeLists.txt
@@ -0,0 +1,35 @@
+add_executable(vector_index)
+
+target_link_libraries(vector_index PUBLIC
+  yutil
+  library-getopt
+  YDB-CPP-SDK::Table
+)
+
+target_sources(vector_index PRIVATE
+  ${YDB_SDK_SOURCE_DIR}/examples/vector_index/main.cpp
+  ${YDB_SDK_SOURCE_DIR}/examples/vector_index/vector_index.cpp
+)
+
+vcs_info(vector_index)
+
+if (CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "AMD64")
+  target_link_libraries(vector_index PUBLIC
+    library-cpuid_check
+  )
+endif()
+
+if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  target_link_options(vector_index PRIVATE
+    -ldl
+    -lrt
+    -Wl,--no-as-needed
+    -lpthread
+  )
+elseif (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+  target_link_options(vector_index PRIVATE
+    -Wl,-platform_version,macos,11.0,11.0
+    -framework
+    CoreFoundation
+  )
+endif()
diff --git a/examples/vector_index/README.md b/examples/vector_index/README.md
@@ -0,0 +1,74 @@
+# Vector Index
+
+
+Parameters description
+
+```
+./vector_index --help
+Usage: ./vector_index [OPTIONS] [ARG]...
+
+Required parameters:
+  {-e|--endpoint} HOST:PORT YDB endpoint
+  {-d|--database} PATH      YDB database
+  {-c|--command} COMMAND    execute command: [Create|Drop|Build|Recreate]Index
+                            or TopK (used for search, read request)
+  --table TABLE             table name
+  --index_type TYPE         index type: [flat]
+  --index_quantizer QUANTIZER
+                            index quantizer: [none|int8|uint8|bit]
+  --primary_key PK          primary key column
+  --embedding EMBEDDING     embedding (vector) column
+  --distance DISTANCE       distance function:
+                            [Cosine|Euclidean|Manhattan]Distance
+  --rows ROWS               count of rows in table, used only for
+                            [Build|Recreate]Index commands
+  --top_k TOPK              count of rows in top, used only for TopK command
+  --data DATA               list of columns to read, used only for TopK command
+  --target TARGET           file with target vector, used only for TopK command
+```
+
+RecreateIndex -- command which sequentially executes Drop, Create and Build commands
+
+Index table will have name like `<table>_<index_type>_<index_quantizer>`
+
+## Examples
+
+### Flat Index
+
+It uses scalar quantization to speedup ANN search:
+* an approximate search is performed using quantization
+* an approximate list of primary keys is obtained
+* we search this list without using quantization
+
+#### Create Flat Bit Index
+
+It creates index table, with two columns: `primary_key` and `embedding`, `embedding` will be trasformed from `<table>` `<embedding>`
+
+```
+./vector_index --endpoint=<endpoint> --database=<database> --command=RecreateIndex --table=<table> --index_type=flat --index_quantizer=bit --primary_key=<primary_key> --embedding=<embedding> --distance=CosineDistance --rows=490000 --top_k=0 --data="" --target=""
+```
+
+#### Search Flat Bit Index
+
+Execute query like this, to get approximate candidates
+
+```sql
+$candidates = SELECT primary_key 
+FROM index_table 
+ORDER BY CosineDistance(target, embedding)
+LIMIT top_k * 2
+```
+
+And then execute and print
+
+```sql
+SELECT CosineDistance(target, embedding) AS distance -- <list of columns from data parameter>
+FROM table
+WHERE primary_key IN $candidates
+ORDER BY distance
+LIMIT top_k
+```
+
+```
+./vector_index --endpoint=<endpoint> --database=<database> --command=RecreateIndex --table=<table> --index_type=flat --index_quantizer=bit --primary_key=<primary_key> --embedding=<embedding> --distance=CosineDistance --rows=0 --top_k=15 --data=<list of string columns, e.g. "title, text"> --target=<absolute-path-to-target.json>
+```
diff --git a/examples/vector_index/main.cpp b/examples/vector_index/main.cpp
@@ -0,0 +1,69 @@
+#include "vector_index.h"
+
+using namespace NLastGetopt;
+using namespace NYdb;
+
+int main(int argc, char** argv) {
+    std::string endpoint;
+    std::string command;
+    TOptions options;
+
+    TOpts opts = TOpts::Default();
+
+    opts.AddLongOption('e', "endpoint", "YDB endpoint").Required().RequiredArgument("HOST:PORT").StoreResult(&endpoint);
+    opts.AddLongOption('d', "database", "YDB database").Required().RequiredArgument("PATH").StoreResult(&options.Database);
+    opts.AddLongOption('c', "command", "execute command: [Create|Drop|Build|Recreate]Index or TopK (used for search, read request)").Required().RequiredArgument("COMMAND").StoreResult(&command);
+    opts.AddLongOption("table", "table name").Required().RequiredArgument("TABLE").StoreResult(&options.Table);
+    opts.AddLongOption("index_type", "index type: [flat]").Required().RequiredArgument("TYPE").StoreResult(&options.IndexType);
+    opts.AddLongOption("index_quantizer", "index quantizer: [none|int8|uint8|bit]").Required().RequiredArgument("QUANTIZER").StoreResult(&options.IndexQuantizer);
+    opts.AddLongOption("primary_key", "primary key column").Required().RequiredArgument("PK").StoreResult(&options.PrimaryKey);
+    opts.AddLongOption("embedding", "embedding (vector) column").Required().RequiredArgument("EMBEDDING").StoreResult(&options.Embedding);
+    opts.AddLongOption("distance", "distance function: [Cosine|Euclidean|Manhattan]Distance").Required().RequiredArgument("DISTANCE").StoreResult(&options.Distance);
+    opts.AddLongOption("rows", "count of rows in table, used only for [Build|Recreate]Index commands").Required().RequiredArgument("ROWS").StoreResult(&options.Rows);
+    opts.AddLongOption("top_k", "count of rows in top, used only for TopK command").Required().RequiredArgument("TOPK").StoreResult(&options.TopK);
+    opts.AddLongOption("data", "list of columns to read, used only for TopK command").Required().RequiredArgument("DATA").StoreResult(&options.Data);
+    opts.AddLongOption("target", "file with target vector, used only for TopK command").Required().RequiredArgument("TARGET").StoreResult(&options.Target);
+
+    opts.SetFreeArgsMin(0);
+    TOptsParseResult result(&opts, argc, argv);
+
+    ECommand cmd = Parse(command);
+
+    if (cmd == ECommand::None) {
+        std::cerr << "Unsupported command: " << command << std::endl;
+        return 1;
+    }
+
+    auto config = TDriverConfig()
+                      .SetEndpoint(endpoint)
+                      .SetDatabase(options.Database)
+                      .SetAuthToken(std::getenv("YDB_TOKEN") ? std::getenv("YDB_TOKEN") : "");
+
+    TDriver driver(config);
+
+    try {
+        switch (cmd) {
+            case ECommand::DropIndex:
+                return DropIndex(driver, options);
+            case ECommand::CreateIndex:
+                return CreateIndex(driver, options);
+            case ECommand::BuildIndex:
+                return BuildIndex(driver, options);
+            case ECommand::RecreateIndex:
+                if (auto r = DropIndex(driver, options); r != 0) {
+                    return r;
+                }
+                if (auto r = CreateIndex(driver, options); r != 0) {
+                    return r;
+                }
+                return BuildIndex(driver, options);
+            case ECommand::TopK:
+                return TopK(driver, options);
+            default:
+                break;
+        }
+    } catch (const std::exception& e) {
+        std::cerr << "Execution failed: " << e.what() << std::endl;
+    }
+    return 1;
+}
diff --git a/examples/vector_index/target.json b/examples/vector_index/target.json
@@ -0,0 +1 @@
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