Enable to output LoD in fetch_op and check output LoD in the op unit test.

paddle/operators/fetch_op.cc

@@ -52,6 +52,7 @@ class FetchOp : public framework::OperatorBase {
     // FIXME(yuyang18): Should we assume the fetch operator always generate
     // CPU outputs?
     dst_item.CopyFrom(src_item, platform::CPUPlace(), dev_ctx);
+    dst_item.set_lod(src_item.lod());
 
     VLOG(3) << "Fetch variable " << fetch_var_name << " to " << out_name;
   }

python/paddle/v2/framework/tests/op_test.py

@@ -333,20 +333,31 @@ class OpTest(unittest.TestCase):
                                          type(sub_out))
                 for sub_out_name, expect in sub_out:
                     idx = find_actual(sub_out_name, fetch_list)
-                    actual = outs[idx]
+                    actual_t = np.array(outs[idx])
+                    expect_t = expect[0] \
+                        if isinstance(expect, tuple) else expect
                     self.assertTrue(
                         np.allclose(
-                            actual, expect, atol=atol),
+                            actual_t, expect_t, atol=atol),
                         "Output (" + sub_out_name + ") has diff at " +
                         str(place))
+                    if isinstance(expect, tuple):
+                        self.assertListEqual(
+                            actual_t.lod(), expect[1], "Output (" + sub_out_name
+                            + ") has different lod at " + str(place))
             else:
                 idx = find_actual(out_name, fetch_list)
-                actual = outs[idx]
+                actual_t = outs[idx]
                 expect = self.outputs[out_name]
+                expect_t = expect[0] if isinstance(expect, tuple) else expect
                 self.assertTrue(
                     np.allclose(
-                        actual, expect, atol=atol),
+                        actual_t, expect_t, atol=atol),
                     "Output (" + out_name + ") has diff at " + str(place))
+                if isinstance(expect, tuple):
+                    self.assertListEqual(actual_t.lod(), expect[1],
+                                         "Output (" + out_name +
+                                         ") has different lod at " + str(place))
 
     def check_output(self, atol=1e-5):
         places = [core.CPUPlace()]

python/paddle/v2/framework/tests/test_lstm_op.py

@@ -155,7 +155,11 @@ class TestLstmOp(OpTest):
             'Weight': w,
             'Bias': b
         }
-        self.outputs = {'Hidden': h, 'Cell': c, 'BatchGate': g_sort}
+        self.outputs = {
+            'Hidden': (h, self.lod),
+            'Cell': (c, self.lod),
+            'BatchGate': g_sort
+        }
         self.attrs = {
             'usePeepholes': True,
             'isReverse': self.is_reverse,