Missed printing 'D' (#3433)

Summary:
'I' was printed twice and 'D' (distance vector) was not printed. Fixed.

Pull Request resolved: https://github.com/facebookresearch/faiss/pull/3433

Reviewed By: fxdawnn

Differential Revision: D57451544

Pulled By: junjieqi

fbshipit-source-id: fc17b3b467f8b2c4ad7d80b44866456d9146e530

tutorial/cpp/1-Flat.cpp

@@ -83,10 +83,10 @@ int main() {
             printf("\n");
         }
 
-        printf("I (5 last results)=\n");
+        printf("D (5 last results)=\n");
         for (int i = nq - 5; i < nq; i++) {
             for (int j = 0; j < k; j++)
-                printf("%5zd ", I[i * k + j]);
+                printf("%5f ", D[i * k + j]);
             printf("\n");
         }
 

tutorial/cpp/2-IVFFlat.cpp

@@ -61,13 +61,10 @@ int main() {
             printf("\n");
         }
 
-        index.nprobe = 10;
-        index.search(nq, xq, k, D, I);
-
-        printf("I=\n");
+        printf("D=\n");
         for (int i = nq - 5; i < nq; i++) {
             for (int j = 0; j < k; j++)
-                printf("%5zd ", I[i * k + j]);
+                printf("%5f ", D[i * k + j]);
             printf("\n");
         }
 

tutorial/cpp/6-HNSW.cpp

@@ -55,12 +55,10 @@ int main() {
             printf("\n");
         }
 
-        index.search(nq, xq, k, D, I);
-
-        printf("I=\n");
+        printf("D=\n");
         for (int i = nq - 5; i < nq; i++) {
             for (int j = 0; j < k; j++)
-                printf("%5zd ", I[i * k + j]);
+                printf("%5f ", D[i * k + j]);
             printf("\n");
         }