Fix bug

3b04f009 · yuyang18 · 39a44e38 · 3b04f009
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paddle/fluid/framework/details/multi_devices_graph_builder.cc ...le/fluid/framework/details/multi_devices_graph_builder.cc +1 -1

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--- a/paddle/fluid/framework/details/multi_devices_graph_builder.cc
+++ b/paddle/fluid/framework/details/multi_devices_graph_builder.cc
@@ -170,7 +170,7 @@ std::unique_ptr<SSAGraph> MultiDevSSAGraphBuilder::Build(

            PADDLE_ENFORCE_EQ(backward_vars.size() % 2, 0);

-            for (size_t i = 0; i < backward_vars.size(); ++i) {
+            for (size_t i = 0; i < backward_vars.size(); i += 2) {
              auto &p_name = backward_vars[i];
              auto &g_name = backward_vars[i + 1];
              VLOG(10) << "Bcast " << g_name << " for parameter " << p_name;