# Pool(w) cannot deal 5 dims data

**URL:** https://discourse.julialang.org/t/pool-w-cannot-deal-5-dims-data/18199
**Category:** General Usage
**Tags:** question, package
**Created:** [December 1, 2018, 1:38am UTC](https://discourse.julialang.org/t/pool-w-cannot-deal-5-dims-data/18199 "2018-12-01T01:38:11Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![lannisite110](https://avatars.discourse-cdn.com/v4/letter/l/df705f/32.png) [@lannisite110](https://discourse.julialang.org/u/lannisite110)
#### Post date: [December 1, 2018, 1:38am UTC](https://discourse.julialang.org/t/pool-w-cannot-deal-5-dims-data/18199/1 "2018-12-01T01:38:12Z")

</div>

julia\>using Knet  
julia\> dims=(3, 3, 3, 1, 64)  
(3, 3, 3, 1, 64)

julia\> w=gaussian(dims)  
3×3×3×1×64 Array{Float64,5}:

julia\> pool(w)  
ERROR: MethodError: no method matching pool(::Array{Float64,5})  
Closest candidates are:  
pool(::Array{Float64,4}; window, padding, stride, mode, maxpoolingNanOpt, alpha, handle) at /home/users/xdlan/.julia/packages/Knet/rKugL/src/conv.jl:526  
pool(::Array{Float32,4}; window, padding, stride, mode, maxpoolingNanOpt, alpha, handle) at /home/users/xdlan/.julia/packages/Knet/rKugL/src/conv.jl:526  
pool(::KnetArray{T,N} where N; handle, alpha, o…) where T at /home/users/xdlan/.julia/packages/Knet/rKugL/src/conv.jl:127  
…  
Stacktrace:  
[1] top-level scope at none:0

---

<div class="post-metadata">

### Author: ![y4lu](https://avatars.discourse-cdn.com/v4/letter/y/47e85d/32.png) [@y4lu](https://discourse.julialang.org/u/y4lu)
#### Post date: [December 1, 2018, 1:49am UTC](https://discourse.julialang.org/t/pool-w-cannot-deal-5-dims-data/18199/2 "2018-12-01T01:49:12Z")

</div>

`>?pool ` does say it supports up to dims=5 for float64, float32

dropping the fourth dimension and running `pool(w)` gives a different but possibly related error, lib not defined

Ah, KnetArrays with dims = 4 or 5 are supported, try

```julia
w2 = KnetArrays(w);
pool(w2);

```

Doesn’t work locally for lack of a discrete gpu

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<div class="post-metadata">

### Author: ![lannisite110](https://avatars.discourse-cdn.com/v4/letter/l/df705f/32.png) [@lannisite110](https://discourse.julialang.org/u/lannisite110)
#### Post date: [December 8, 2018, 7:46am UTC](https://discourse.julialang.org/t/pool-w-cannot-deal-5-dims-data/18199/3 "2018-12-08T07:46:11Z")

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thank you, i have solved it. The tutor helps a lot.