Wrong LaTeX syntax in the linear_chain_crf operator comment
Created by: lcy-seso
https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/operators/linear_chain_crf_op.cc#L38-L48
Extra \f$ \f$ for all the formula.
Created by: lcy-seso
https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/operators/linear_chain_crf_op.cc#L38-L48
Extra \f$ \f$ for all the formula.