How to construct a causallearn.graph.Graph object from an numpy array?

[Zehao Jin]

I have a numpy array of adjacency matrix, such as

array=np.array([[0, 0, 0, 0, 0, 0, 0],
                [1, 0, 0, 0, 1, 0, 0],
                [0, 0, 0, 0, 0, 0, 0],
                [0, 0, 1, 0, 0, 0, 0],
                [1, 0, 1, 0, 0, 0, 0],
                [1, 0, 0, 0, 0, 0, 0],
                [0, 0, 0, 0, 0, 1, 0]])

and I would like to convert it to a causallearn graph object, such as
DAG=array2DAG(array)
such that is can be applicable to most of causallearn ultility functions, such as

CPDAG=dag2cpdag(DAG)
shd= SHD(ground_truth, CPDAG).get_shd()

What is the easiest way to make that array2DAG function?
I was trying this: (simply assign the array to G.graph)

cg = CausalGraph(array.shape[0])
cg.G.graph=array
DAG=cg.G

but this didn't work.

[Zehao Jin]

Uhmm I hard coded it out by start with a fully connected graph, and then removing all edges, and then adding edges. Not the most elegant way, but seems to work.

def array2dag(array):
    num_nodes = array.shape[0]
    cg = CausalGraph(num_nodes)
    for i in range(num_nodes):
        for j in range(num_nodes):
            edge1 = cg.G.get_edge(cg.G.nodes[i], cg.G.nodes[j])
            if edge1 is not None:
                cg.G.remove_edge(edge1)

    for i in range(num_nodes):
        for j in range(num_nodes):
            if adjacency_matrix[i,j] == 1:
                cg.G.add_edge(Edge(cg.G.nodes[i], cg.G.nodes[j], Endpoint.TAIL, Endpoint.ARROW))

    DAG = cg.G
    return DAG

[Yujia Zheng]

Yeah, that seems to do the job. We don't have an existing function to do this since the definition of the endpoints might vary in different cases, but it doesn't seem to be a very complicated procedure to transfer.