fix build error

Former-commit-id: e26f7020231d6a2b3870ef427378df833cedbfa4

core/src/index/knowhere/knowhere/index/vector_index/IndexIVF.cpp

@@ -31,11 +31,14 @@
 
 #include "knowhere/adapter/VectorAdapter.h"
 #include "knowhere/common/Exception.h"
+#include "knowhere/common/Log.h"
 #include "knowhere/index/vector_index/IndexGPUIVF.h"
 #include "knowhere/index/vector_index/IndexIVF.h"
 
 namespace knowhere {
 
+using stdclock = std::chrono::high_resolution_clock;
+
 IndexModelPtr
 IVF::Train(const DatasetPtr& dataset, const Config& config) {
     auto build_cfg = std::dynamic_pointer_cast<IVFCfg>(config);