Add grad epilogue passes for PyNative mode.

mindspore/ccsrc/pipeline/jit/pass.cc

@@ -151,6 +151,7 @@ OptPassGroupMap GetOptPassesA(const opt::irpass::OptimizeIRPassLib &irpass) {
     opt::OptPassConfig({resolve_irpass.resolver_resolve_, resolve_irpass.resolver_getattr_,
                         irpass.get_make_ref_eliminate_, irpass.replace_old_param_});
 
+  // Before adjusting map_a, check GetA1A2() and GetOptPynativeGradEpiloguePhases().
   OptPassGroupMap map_a({{"a_1", a_1},
                          {"a_2", a_2},
                          {"auto_parallel", opt::OptPassConfig(parallel::StepAutoParallel)},
@@ -272,6 +273,17 @@ OptPassGroupMap GetControlPhases(const opt::irpass::OptimizeIRPassLib &irpass) {
   return map;
 }
 
+OptPassGroupMap GetOptPynativeGradEpiloguePhases(const opt::irpass::OptimizeIRPassLib &irpass) {
+  auto opt_a = GetOptPassesA(irpass);
+  auto a3 = opt_a[opt_a.size() - 1];
+  OptPassGroupMap map({
+    {"renormalize", opt::OptPassConfig::Renormalize()},
+    {"cse", opt::OptPassConfig(opt::CSEPass(false))},
+    {a3},
+  });
+  return map;
+}
+
 OptPassGroupMap GetInferenceOptPreparePhases() {
   opt::irpass::InferenceOptPrepareLib irpass;
   auto grad_var_prepare = opt::OptPassConfig({irpass.grad_var_prepare_});
@@ -303,6 +315,8 @@ void InitOpt(const ResourcePtr &res) {
       Optimizer::MakeOptimizer("opt_graph_kernel_b", res, GetOptPassesGraphKernelB(irpass), false);
     g_pass_opts["renormal"] = Optimizer::MakeOptimizer("renormal", res, GetOptPassesC(irpass));
     g_pass_opts["opt_control"] = Optimizer::MakeOptimizer("opt_control", res, GetControlPhases(irpass), false, true);
+    g_pass_opts["opt_grad_epilogue"] =
+      Optimizer::MakeOptimizer("opt_grad_epilogue", res, GetOptPynativeGradEpiloguePhases(irpass), true, false);
     g_pass_opts["opt_prepare"] = Optimizer::MakeOptimizer("opt_prepare", res, GetPreparePhases(irpass));
     auto context_ptr = MsContext::GetInstance();
     MS_EXCEPTION_IF_NULL(context_ptr);
@@ -351,6 +365,8 @@ bool PrepareGroup(const ResourcePtr &res) { return OptPassGroup(res, "opt_prepar
 
 bool OptPassRNGroup(const ResourcePtr &res) { return OptPassGroup(res, "renormal"); }
 
+bool OptPassGradEpilogueGroup(const ResourcePtr &res) { return OptPassGroup(res, "opt_grad_epilogue"); }
+
 bool AddControlDependPass(const ResourcePtr &res) {
   FuncGraphPtr func_graph = res->func_graph();
   MS_EXCEPTION_IF_NULL(func_graph);
@@ -469,7 +485,8 @@ std::vector<PassItem> kGePasses = {{"simplify_data_structures", SimplifyDataStru
                                    {"opt_prepare", PrepareGroup},
                                    {"cconv", CconvPass}};
 
-std::vector<PassItem> kPynativePasses = {{"opt_a", OptPassAGroup},
+std::vector<PassItem> kPynativePasses = {{"opt_grad_epilogue", OptPassGradEpilogueGroup},
+                                         {"opt_a", OptPassAGroup},
                                          {"opt_b", OptPassBGroup},
                                          {"cconv", CconvPass},
                                          {"transform_top", TransformTopGraphPass},