# Package recommendations for the task of modeling a multivariate nonlinear stiff system with a black box modeling method

**URL:** <https://discourse.julialang.org/t/package-recommendations-for-the-task-of-modeling-a-multivariate-nonlinear-stiff-system-with-a-black-box-modeling-method/40978>\
**Category:** General Usage\
**Tags:** question, package\
**Created:** [June 8, 2020, 8:43am UTC](https://discourse.julialang.org/t/package-recommendations-for-the-task-of-modeling-a-multivariate-nonlinear-stiff-system-with-a-black-box-modeling-method/40978 "2020-06-08T08:43:11Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Volker](https://avatars.discourse-cdn.com/v4/letter/v/77aa72/32.png) [@Volker](https://discourse.julialang.org/u/Volker)\
**Post date:** [June 8, 2020, 8:43am UTC](https://discourse.julialang.org/t/package-recommendations-for-the-task-of-modeling-a-multivariate-nonlinear-stiff-system-with-a-black-box-modeling-method/40978/1 "2020-06-08T08:43:11Z")

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Hi, I´m looking for a black box method, which can deal with nonlinear multivariate stiff systems. With stiff I mean a system, which has quite fast but also quite slow time constants. Are there any recommendations which Julia package I should choose for this task?

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**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [February 6, 2021, 6:50pm UTC](https://discourse.julialang.org/t/package-recommendations-for-the-task-of-modeling-a-multivariate-nonlinear-stiff-system-with-a-black-box-modeling-method/40978/2 "2021-02-06T18:50:00Z")

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[https://diffeq.sciml.ai/stable/tutorials/advanced\_ode\_example/](https://diffeq.sciml.ai/stable/tutorials/advanced_ode_example/)

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**Author:** ![Volker](https://avatars.discourse-cdn.com/v4/letter/v/77aa72/32.png) [@Volker](https://discourse.julialang.org/u/Volker)\
**Post date:** [February 8, 2021, 8:38am UTC](https://discourse.julialang.org/t/package-recommendations-for-the-task-of-modeling-a-multivariate-nonlinear-stiff-system-with-a-black-box-modeling-method/40978/3 "2021-02-08T08:38:06Z")

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Thanks. I will have a look. I think the statements of your link will also apply for DiffEqFlux. Therefore my attempts will focus on UODEs. Besides I will investigate attention based approaches.

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**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [February 8, 2021, 1:06pm UTC](https://discourse.julialang.org/t/package-recommendations-for-the-task-of-modeling-a-multivariate-nonlinear-stiff-system-with-a-black-box-modeling-method/40978/4 "2021-02-08T13:06:39Z")

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Message me and we can share a manuscript about handling the difficulties of neural network fitting to stiff systems.

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**Author:** ![Volker](https://avatars.discourse-cdn.com/v4/letter/v/77aa72/32.png) [@Volker](https://discourse.julialang.org/u/Volker)\
**Post date:** [February 8, 2021, 2:25pm UTC](https://discourse.julialang.org/t/package-recommendations-for-the-task-of-modeling-a-multivariate-nonlinear-stiff-system-with-a-black-box-modeling-method/40978/5 "2021-02-08T14:25:37Z")

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That sounds like a great idea 🙂 I will message you when I got my first results