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docs: update LoD documentation in new_cpp_op_cn.md
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docs/dev_guides/api_contributing_guides/new_cpp_op_cn.md

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@@ -1159,7 +1159,7 @@ The following device operations are asynchronous with respect to the host:
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- 改变:适用于部分 LoD-Based 算子。在实现 OpKernel 时需考虑输出 LoD 的正确计算,真实的 LoD 在前向计算结束后才能确定,此时仍需要在`InferMeta` 中调用 `ShareLoD()`,以确保 CompileTime 时对 LoD Level 做了正确的传导,可参考 [sequence_expand_op](https://github.com/PaddlePaddle/Paddle/blob/565d30950138b9f831caa33904d9016cf53c6c2e/paddle/fluid/operators/sequence_ops/sequence_expand_op.cc);
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- 消失:适用于输出不再是序列数据的 LoD-Based 算子。此时不用再考虑前向的 LoD 传导问题,可参考 [sequence_pool_op](https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/fluid/operators/sequence_ops/sequence_mask_op.cc);
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- 消失:适用于输出不再是序列数据的 LoD-Based 算子。此时不用再考虑前向的 LoD 传导问题,可参考 [sequence_pool_op](https://github.com/PaddlePaddle/Paddle/blob/565d30950138b9f831caa33904d9016cf53c6c2e/paddle/fluid/operators/sequence_ops/sequence_pool_op.cc);
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其它重要的注意事项:
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