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The seq_concat_op should correctly process LoD since the meaning of LoD has been changed.
Created by: qingqing01
The issue#4945 change LoD's absolute offsets to relative offsets, especially for the more than 1 level sequence. So the seq_concat_op should correctly process LoD and update the unit testing: https://github.com/PaddlePaddle/Paddle/blob/develop/python/paddle/v2/framework/tests/test_seq_concat_op.py#L11