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Add cython code for global gw#145

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antoinedemathelin wants to merge 1 commit intoflatironinstitute:139-global-gromov-wassersteinfrom
antoinedemathelin:cython-global-gromov-wasserstein
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Add cython code for global gw#145
antoinedemathelin wants to merge 1 commit intoflatironinstitute:139-global-gromov-wassersteinfrom
antoinedemathelin:cython-global-gromov-wasserstein

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Add cython code for the update of D matrix in the extreme_points_update function of global gromov wasserstein algorithm.

It accelerates the algorithm on the small example by a factor of two. The bottleneck is now the C_sparse_int.T @ C_sparse_int operation.

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