# Hidden layers in Flux
**URL:** https://discourse.julialang.org/t/hidden-layers-in-flux/39910
**Category:** Machine Learning
**Tags:** question
**Created:** [May 21, 2020, 8:28pm UTC](https://discourse.julialang.org/t/hidden-layers-in-flux/39910 "2020-05-21T20:28:25Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Mariana](https://discourse.julialang.org/u/Mariana)
#### Post date: [May 21, 2020, 8:28pm UTC](https://discourse.julialang.org/t/hidden-layers-in-flux/39910/1 "2020-05-21T20:28:25Z")
I’m starting to work with Flux and I want to build a neural network with 5 entries and 6 exits. I have already built a network with no hidden layers, but now I want to add hidden layers. How should I do that? I believe I need to use the Dense function, but I’m not sure how to do that.
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### Author:  [@dmolina](https://discourse.julialang.org/u/dmolina)
#### Post date: [May 21, 2020, 8:41pm UTC](https://discourse.julialang.org/t/hidden-layers-in-flux/39910/2 "2020-05-21T20:41:53Z")
An example:
```julia
model = Chain(Dense(5, n), Dense(n, 6))
```
where n is the number of neurons in the hidden layer.
You can see the Documentation of Flux, it is improving a lot lately.
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### Author:  [@Mariana](https://discourse.julialang.org/u/Mariana)
#### Post date: [May 21, 2020, 9:43pm UTC](https://discourse.julialang.org/t/hidden-layers-in-flux/39910/3 "2020-05-21T21:43:48Z")
Thank you for your answer!! But what about the number of hidden layers? How do I define that in the Dense function?
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### Author:  [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)
#### Post date: [May 21, 2020, 10:39pm UTC](https://discourse.julialang.org/t/hidden-layers-in-flux/39910/4 "2020-05-21T22:39:37Z")
You just add an other (e.g. `Dense`) layer to the `Chain` function.
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### Author:  [@Mariana](https://discourse.julialang.org/u/Mariana)
#### Post date: [May 21, 2020, 11:28pm UTC](https://discourse.julialang.org/t/hidden-layers-in-flux/39910/5 "2020-05-21T23:28:24Z")
Thank you!! So, for example, if I want to create a network with 1 hidden layer with 7 neurons, I’d have:
model = Chain(Dense(5,7), Dense(7,6), Dense(6,6))?
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### Author:  [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)
#### Post date: [May 22, 2020, 1:24pm UTC](https://discourse.julialang.org/t/hidden-layers-in-flux/39910/6 "2020-05-22T13:24:13Z")
Have you tried it?