Thanks for trying! I was actually hoping for a way to completely avoid
creating this sage DiGraph. But either to get the matrix directly into the
algorithm (which currently seems impossible), or at least to directly
construct some internal graph data structure.
Looking at the code of sage.graphs.bliss.canonical_form, you see that the
input digraph is turned into a bliss_digraph (whatever that is). So I
believe that there is, in principle, a way to bypass the DiGraph creation...
Thanks again, Christian
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