follow some comments

Author: sneaxiy

paddle/fluid/framework/ir/pass.cc

@@ -29,9 +29,6 @@ class Graph;
 #include "paddle/fluid/platform/mkldnn_helper.h"
 #endif
 
-DEFINE_bool(apply_pass_to_program, false,
-            "Whether to apply IR pass to program");
-
 namespace paddle {
 namespace framework {
 namespace ir {

paddle/fluid/platform/flags.cc

@@ -620,3 +620,15 @@ DEFINE_bool(conv2d_disable_cudnn, false, "Disable cudnn in conv2d");
 DEFINE_int32(get_host_by_name_time, 120,
              "The maximum time for get host by name time");
 #endif
+
+/**
+ * Distributed related FLAG
+ * Name: FLAGS_apply_pass_to_program
+ * Since Version: 2.2.0
+ * Value Range: bool, default=false
+ * Example: FLAGS_apply_pass_to_program=true, apply IR Pass to When using
+ *          Fleet APIs.
+ * Note: Apply IR pass to program. Be only useful when using Fleet APIs.
+ */
+DEFINE_bool(apply_pass_to_program, false,
+            "Whether to apply IR pass to program when using Fleet APIs");

python/paddle/distributed/fleet/base/fleet_base.py

@@ -18,7 +18,7 @@
 import paddle
 import os
 import numpy as np
-from paddle.fluid.framework import dygraph_only
+from paddle.fluid.framework import dygraph_only, _global_flags
 from paddle.fluid import compiler
 from .role_maker import UserDefinedRoleMaker, PaddleCloudRoleMaker, RoleMakerBase
 from .strategy_compiler import StrategyCompiler
@@ -40,7 +40,7 @@
 
 def apply_ir_passes(main_program, startup_program, config):
     build_strategy = config._user_defined_strategy.build_strategy._copy()
-    if not paddle.fluid.core.globals()['FLAGS_apply_pass_to_program']:
+    if not _global_flags()['FLAGS_apply_pass_to_program']:
         return build_strategy
 
     pipeline_opt = getattr(main_program, "_pipeline_opt", {})