# What is the uknown rate, how to resolve it?

**URL:** <https://discourse.julialang.org/t/what-is-the-uknown-rate-how-to-resolve-it/68839>\
**Category:** Optimization (Mathematical)\
**Tags:** package, optimization\
**Created:** [September 27, 2021, 9:59pm UTC](https://discourse.julialang.org/t/what-is-the-uknown-rate-how-to-resolve-it/68839 "2021-09-27T21:59:39Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Lessvn](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/lessvn/32/29511_2.png) [@Lessvn](https://discourse.julialang.org/u/Lessvn)\
**Post date:** [September 27, 2021, 9:59pm UTC](https://discourse.julialang.org/t/what-is-the-uknown-rate-how-to-resolve-it/68839/1 "2021-09-27T21:59:39Z")

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Hello,  
I am trying to solve an optimzation problem using SCIP, it looks like every thing is fine, unless I get this warning at the onset where the solution starts.

```julia
WARNING: ignore partial solution (0) because unknown rate is too large (0.898204 > 0.85)

```

I am new to SCIP, and don’t know what this warninng is and if there is a work around to this?

Thanks!

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**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [September 27, 2021, 10:28pm UTC](https://discourse.julialang.org/t/what-is-the-uknown-rate-how-to-resolve-it/68839/2 "2021-09-27T22:28:25Z")

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Hi there!

This has been recently asked on stack exchange:  
[https://or.stackexchange.com/questions/6240/or-tools-partial-solution-ignored-due-to-unknown-rate-is-too-large](https://or.stackexchange.com/questions/6240/or-tools-partial-solution-ignored-due-to-unknown-rate-is-too-large)

Did you try passing an incomplete solution as a warm-start?

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<div class="post-metadata">

**Author:** ![Lessvn](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/lessvn/32/29511_2.png) [@Lessvn](https://discourse.julialang.org/u/Lessvn)\
**Post date:** [September 27, 2021, 11:09pm UTC](https://discourse.julialang.org/t/what-is-the-uknown-rate-how-to-resolve-it/68839/3 "2021-09-27T23:09:39Z")

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Thanks @odow! No I am not trying to pass an incomplete solution.

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**Author:** ![leethargo](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/leethargo/32/6004_2.png) [@leethargo](https://discourse.julialang.org/u/leethargo)\
**Post date:** [September 28, 2021, 7:35am UTC](https://discourse.julialang.org/t/what-is-the-uknown-rate-how-to-resolve-it/68839/4 "2021-09-28T07:35:46Z")

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Could share a full working example?  
Maybe the issue is that some auxiliary variables don’t have starting values, or that integer variables are handled differently from continuous variables.

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<div class="post-metadata">

**Author:** ![Lessvn](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/lessvn/32/29511_2.png) [@Lessvn](https://discourse.julialang.org/u/Lessvn)\
**Post date:** [October 8, 2021, 1:28pm UTC](https://discourse.julialang.org/t/what-is-the-uknown-rate-how-to-resolve-it/68839/5 "2021-10-08T13:28:17Z")

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@leethargo Thanks for the reply. I was able to solve it by setting a tighter optimality gap. Not sure if what I did was the way to handle this though. 🙂