# Best flux for Tracker: 0.9 or 0.8.3?

**URL:** <https://discourse.julialang.org/t/best-flux-for-tracker-0-9-or-0-8-3/37143>\
**Category:** Machine Learning\
**Created:** [April 7, 2020, 5:09am UTC](https://discourse.julialang.org/t/best-flux-for-tracker-0-9-or-0-8-3/37143 "2020-04-07T05:09:23Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jaynick](https://avatars.discourse-cdn.com/v4/letter/j/71c47a/32.png) [@jaynick](https://discourse.julialang.org/u/jaynick)\
**Post date:** [April 7, 2020, 5:09am UTC](https://discourse.julialang.org/t/best-flux-for-tracker-0-9-or-0-8-3/37143/1 "2020-04-07T05:09:23Z")

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A post in [this recent discussion](https://discourse.julialang.org/t/reddit-discussion-limitations-of-zygote/36982/15) recommends using Tracker rather than Zygote if one is less adventurous.

I am undecided, but, if one is to use Tracker, which version of Flux is best?

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**Author:** ![mkschleg](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mkschleg/32/8035_2.png) [@mkschleg](https://discourse.julialang.org/u/mkschleg)\
**Post date:** [April 10, 2020, 4:20am UTC](https://discourse.julialang.org/t/best-flux-for-tracker-0-9-or-0-8-3/37143/2 "2020-04-10T04:20:23Z")

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I use 0.9 for a few research projects that aren’t ready to move to Zygote (the way we are doing BPTT wasn’t easily portable). I have no issues w/ it, but I only do pretty simple models (i.e. only a few layers max and some recurrent layers). I have used Zygote for a few projects and toy examples and it seems pretty stable for a lot of neural network stuff (i.e. what is implemented in Flux/NNLib). While I agree there are some limitations currently (and some annoying corner cases) which have been listed in the discussion you linked, it really is much nicer to use than Tracker (dealing w/ tracked arrays was quite annoying when I was trying to take advantage of multiple dispatch).

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**Author:** ![jaynick](https://avatars.discourse-cdn.com/v4/letter/j/71c47a/32.png) [@jaynick](https://discourse.julialang.org/u/jaynick)\
**Post date:** [April 11, 2020, 3:08am UTC](https://discourse.julialang.org/t/best-flux-for-tracker-0-9-or-0-8-3/37143/3 "2020-04-11T03:08:31Z")

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Thank you ,  
this is helpful