cherry-picked changes. test=release/1.3

Author: dzhwinter

python/paddle/fluid/compiler.py

@@ -178,9 +178,9 @@ def _compile_data_parallel(self):
         # FIXME(dzhwinter): enable_inplace should be after memory_optimize
         # if turn on python memory optimize, turn off the inplace_pass.
         if self._build_strategy.memory_optimize is True:
-            self._build_strategy.memory_optimize = False if main._is_mem_optimized else True
+            self._build_strategy.memory_optimize = False if self._program._is_mem_optimized else True
         if self._build_strategy.enable_inplace is True:
-            self._build_strategy.enable_inplace = False if main._is_mem_optimized else True
+            self._build_strategy.enable_inplace = False if self._program._is_mem_optimized else True
 
         if self._build_strategy.num_trainers > 1 and trainers_endpoints:
             assert self._build_strategy.num_trainers == len(