add non-binarized casual matrix

[YUYING07]

#121
CORL, DAG-GNN, and other methods only return and thresh comparison of 0-1 matrix, which CORL thresh is the algorithm comes with 0.3 can not be changed, but a lot of datasets with 0.3 is not accurate, can be in the original method are added to return the original value of the casual_matrix function?

[shaido987]

Hello,

that CORL has a fixed 0.3 threshold is something that must have been overlooked. It should be quick and easy to add an additional input parameter with the desired value. We will correct this in the coming days.

For adding the non-binary matrix, we would be happy to merge a PR that adds it to the BaseLearner and all the algorithms. As this changes the possible outputs of an algorithm it would be confusing if it's only supported by a subset of the algorithms (hence adding it to all algorithms would be better).

[YUYING07]

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