Another place to speed up:
About 10% time is spent on 'totalDegree' of GDMP,
totalDegree p ==
zero? p => 0
"max"/[reduce("+",(t.k)::(Vector NNI), 0) for t in p]
t.k is of type E which has category DirectProductCategory(#vl,
NonNegativeInteger).
The problem is in the coercion to Vector, it causes a copy.
Of cource it doesn't need a copy to count the degree, but
there's no 'reduce' function exported for DirectProductCategory.
I wonder how to add 'reduce' to DirectProductCategory.
'reduce' comes from Collection, but DirectProductCategory
is unfit to be a collection because it has fixed number of elements.
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