[GCMC]Fixing warnings that appear during in `gcmc` training. (#7152)

examples/pytorch/gcmc/train.py

@@ -194,14 +194,14 @@ def train(args):
                 loss=count_loss / (iter_idx + 1),
                 rmse=count_rmse / count_num,
             )
-            logging_str = (
-                "Iter={}, loss={:.4f}, rmse={:.4f}, time={:.4f}".format(
-                    iter_idx,
-                    count_loss / iter_idx,
-                    count_rmse / count_num,
-                    np.average(dur),
-                )
+            logging_str = "Iter={:4d}, loss={:.4f}, rmse={:.4f}".format(
+                iter_idx,
+                count_loss / iter_idx,
+                count_rmse / count_num,
             )
+            if iter_idx > 3:
+                logging_str += ", time={:.4f}".format(np.average(dur))
+
             count_rmse = 0
             count_num = 0