#1320 remove debug logging from faiss (#1321)

Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>

CHANGELOG.md

@@ -54,6 +54,7 @@ Please mark all change in change log and use the issue from GitHub
 - \#1078 - Move 'insert_buffer_size' to Cache Config section
 - \#1105 - Error message is not clear when creating IVFSQ8H index without gpu resources
 - \#741, #856, #879, #973, #1100, #1163, #1175, #1206, #1219, #1225, #1233, #1258, #1265, #1274, #1292, #1305 - Various fixes and improvements for Milvus documentation.
+- \#1320 - Remove debug logging from faiss
 
 ## Task
 

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

@@ -24,7 +24,6 @@
 #include <thrust/host_vector.h>
 #include <unordered_map>
 #include <numeric>
-#include <chrono>
 
 namespace faiss { namespace gpu {
 
@@ -71,14 +70,11 @@ IVFFlat::copyCodeVectorsFromCpu(const float* vecs,
     // list; the length is in sizeof(char)
     FAISS_ASSERT(deviceData_->size() + lengthInBytes <= std::numeric_limits<int64_t>::max());
 
-    std::chrono::high_resolution_clock::time_point time1 = std::chrono::high_resolution_clock::now();
     deviceData_->append((unsigned char*) vecs,
                             lengthInBytes,
                             stream,
                             true /* exact reserved size */);
-    std::chrono::high_resolution_clock::time_point time2 = std::chrono::high_resolution_clock::now();
     copyIndicesFromCpu_(indices, list_length);
-    std::chrono::high_resolution_clock::time_point time3 = std::chrono::high_resolution_clock::now();
     maxListLength_ = 0;
 
     size_t listId = 0;
@@ -97,7 +93,6 @@ IVFFlat::copyCodeVectorsFromCpu(const float* vecs,
         pos += size;
         ++ listId;
     }
-    std::chrono::high_resolution_clock::time_point time4 = std::chrono::high_resolution_clock::now();
 
     deviceListDataPointers_ = hostPointers;
 
@@ -106,16 +101,6 @@ IVFFlat::copyCodeVectorsFromCpu(const float* vecs,
     if (stream != 0) {
         streamWait({stream}, {0});
     }
-    std::chrono::high_resolution_clock::time_point time5 = std::chrono::high_resolution_clock::now();
-
-    double span1 = (std::chrono::duration<double, std::micro>(time2 - time1)).count();
-    double span2 = (std::chrono::duration<double, std::micro>(time3 - time2)).count();
-    double span3 = (std::chrono::duration<double, std::micro>(time4 - time3)).count();
-    double span4 = (std::chrono::duration<double, std::micro>(time5 - time4)).count();
-    std::cout << "Span1: " << span1 * 0.001 << "ms" << std::endl;
-    std::cout << "Span2: " << span2 * 0.001 << "ms" << std::endl;
-    std::cout << "Span3: " << span3 * 0.001 << "ms" << std::endl;
-    std::cout << "Span4: " << span4 * 0.001 << "ms" << std::endl;
 }
 
 void