add fake init test in test_dist_transpiler

paddle/fluid/operators/fake_init_op.cc

@@ -68,9 +68,10 @@ class FakeInitOpMaker : public framework::OpProtoAndCheckerMaker {
               "(Tensor) Tensor of specified shape will be filled "
               "with the specified value");
     AddComment(R"DOC(
-FakeInitBatchSizeLike Operator.
+FakeInit Operator.
 
-Init an op but not alloc tensor for it, it is used for distributed lookup table.
+Init an variable but not alloc memory for it, it is used for init the
+table parameter at trainer side in distributed lookup table.
 
 )DOC");
   }

python/paddle/fluid/tests/unittests/test_dist_transpiler.py

@@ -497,7 +497,7 @@ class TestDistLookupTable(TestDistLookupTableBase):
         # 5 save table
         self.assertEqual([op.type for op in pserver1.blocks[5].ops], ["save"])
 
-        trainer, _ = self.get_trainer()
+        trainer, trainer_startup = self.get_trainer()
         self.assertEqual(len(trainer.blocks), 1)
         ops = [
             'split_ids', 'prefetch', 'merge_ids', 'sequence_pool', 'split_ids',
@@ -511,6 +511,16 @@ class TestDistLookupTable(TestDistLookupTableBase):
         ]
         self.assertEqual([op.type for op in trainer.blocks[0].ops], ops)
 
+        startup_ops = [
+            'fill_constant', 'fill_constant', 'fill_constant', 'fill_constant',
+            'fill_constant', 'fill_constant', 'fill_constant', 'fill_constant',
+            'fill_constant', 'fill_constant', 'fill_constant', 'fill_constant',
+            'fill_constant', 'fill_constant', 'uniform_random', 'recv', 'recv',
+            'fetch_barrier', 'fake_init'
+        ]
+        self.assertEqual([op.type for op in trainer_startup.blocks[0].ops],
+                         startup_ops)
+
 
 class TestAsyncLocalLookupTable(TestDistLookupTableBase):
     def net_conf(self):