Philip Taffet
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Philip Taffetさんがコメントを作成しました:
Here's an idea for a workaround: I'm assuming your problem is `min(obj)` where `obj` is a variable. You can use a combination of big-M constraints and no-good cuts to form a user cutting plane. Sup...
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Philip Taffetさんがコメントを作成しました:
Something actually seems very wrong. If I turn heuristics to 1, it hangs in the state shown in the second log for over 48 hours. It seems it has picked a variable to branch on but hasn't finished e...
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Philip Taffetさんがコメントを作成しました:
That's what Gurobi names variables that you don't name yourself. You can provide a more meaningful name when you create the variables.
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Philip Taffetさんがコメントを作成しました:
The mathematical description seems to encode \( |V|*\sum_u C_u \) constraints, but it looks like you are only creating \( |V| \) constraints. Could that be the problem?
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Philip Taffetさんが投稿を作成しました:
Astronomically low node throughput; major degeneracy?
回答済みHi, I'm trying to diagnose a large MIP model that appears to hang. Unlike previous models that have seemed to hang because they get stuck trying cuts at the root node, this model seems to select a ...
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Philip Taffetさんがコメントを作成しました:
Hi Tobias, Thanks, that makes sense. I'm looking forward to the fix. Thanks, Philip
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Philip Taffetさんがコメントを作成しました:
Your callback can definitely handle multiple `where` values with if statements.
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Philip Taffetさんがコメントを作成しました:
Setting Cuts=0, it solves in about an hour, but it still does not seem to be using my heuristic solution, in spite of returning the correct objective from cbUseSolution() Nodes | Current ...
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Philip Taffetさんがコメントを作成しました:
Hi Jaromił, Thanks for the response. I tried the two parameter settings you suggested, and it they did not help. The first MIPNODE callback happened 1300s after the root relaxation finished, and >1...
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Philip Taffetさんが投稿を作成しました:
Injecting Heuristic Solution with Callback is Very Slow
進行中Hi, I have a heuristic for a difficult MIP I am solving. I'm using two processes, similar to How do I inject a solution calculated in a separate process? – Gurobi Support Portal . Although my heuri...