diff --git a/analytical_engine/apps/pregel/louvain/louvain_app_base.h b/analytical_engine/apps/pregel/louvain/louvain_app_base.h
index 92e51333c917..13386bf7790b 100644
--- a/analytical_engine/apps/pregel/louvain/louvain_app_base.h
+++ b/analytical_engine/apps/pregel/louvain/louvain_app_base.h
@@ -226,7 +226,7 @@ class LouvainAppBase
       // after one pass if already decided halt, that means the pass yield no
       // changes, so we halt computation.
       if (current_super_step <= 14 ||
-          std::fabs(actual_quality - ctx.prev_quality()) < 
+          std::fabs(actual_quality - ctx.prev_quality()) <
               min_quality_improvement) {
         // turn to sync community result
         ctx.compute_context().set_superstep(sync_result_step);