Merge branch 'ms-372' into 'branch-0.4.0'

MS372 dev clone index and get index deviceId

See merge request megasearch/milvus!381

Former-commit-id: 82df26e98dbc3e09e90b38fb3cc27dfc70a0f62e

cpp/src/wrapper/knowhere/vec_impl.cpp

@@ -8,6 +8,7 @@
 #include "knowhere/index/vector_index/idmap.h"
 #include "knowhere/index/vector_index/gpu_ivf.h"
 #include "knowhere/common/exception.h"
+#include "knowhere/index/vector_index/cloner.h"
 
 #include "vec_impl.h"
 #include "data_transfer.h"
@@ -152,6 +153,22 @@ VecIndexPtr VecIndexImpl::CopyToCpu(const Config &cfg) {
     return std::make_shared<VecIndexImpl>(cpu_index, type);
 }
 
+VecIndexPtr VecIndexImpl::Clone() {
+    auto clone_index = std::make_shared<VecIndexImpl>(index_->Clone(), type);
+    clone_index->dim = dim;
+    return clone_index;
+}
+
+int64_t VecIndexImpl::GetDeviceId() {
+    if (auto device_idx = std::dynamic_pointer_cast<GPUIndex>(index_)){
+        return device_idx->GetGpuDevice();
+    }
+    else {
+        return -1; // -1 == cpu
+    }
+    return 0;
+}
+
 float *BFIndex::GetRawVectors() {
     auto raw_index = std::dynamic_pointer_cast<IDMAP>(index_);
     if (raw_index) { return raw_index->GetRawVectors(); }

cpp/src/wrapper/knowhere/vec_impl.h

@@ -33,6 +33,8 @@ class VecIndexImpl : public VecIndex {
     server::KnowhereError Add(const long &nb, const float *xb, const long *ids, const Config &cfg) override;
     zilliz::knowhere::BinarySet Serialize() override;
     server::KnowhereError Load(const zilliz::knowhere::BinarySet &index_binary) override;
+    VecIndexPtr Clone() override;
+    int64_t GetDeviceId() override;
     server::KnowhereError Search(const long &nq, const float *xq, float *dist, long *ids, const Config &cfg) override;
 
  protected:

cpp/src/wrapper/knowhere/vec_index.h

@@ -63,6 +63,10 @@ class VecIndex {
 
     virtual VecIndexPtr CopyToCpu(const Config &cfg = Config()) = 0;
 
+    virtual VecIndexPtr Clone() = 0;
+
+    virtual int64_t GetDeviceId() = 0;
+
     virtual IndexType GetType() = 0;
 
     virtual int64_t Dimension() = 0;