Fix unitttest in sequence_pad_op

Author: Yibing Liu

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

@@ -62,7 +62,7 @@ def compute(self):
             start_idx = end_idx
 
         out_data = np.array(padded_sequences)
-        length = np.array(self.x_len_lod[0])
+        length = np.array(self.x_len_lod[0]).reshape((-1, 1))
         self.outputs = {'Out': out_data, 'Length': length}
 
     def setUp(self):
@@ -130,3 +130,7 @@ def set_attr(self):
         self.pad_value = [1.0]
         self.padded_length = 7
         self.dtype = 'float32'
+
+
+if __name__ == '__main__':
+    unittest.main()