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<html lang="en"><head><meta charset="UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><title>GPU Support · Flux</title><script>(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
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W = cu(rand(2, 5)) # a 2×5 CuArray
b = cu(rand(2))
predict(x) = W*x .+ b
loss(x, y) = sum((predict(x) .- y).^2)
x, y = cu(rand(5)), cu(rand(2)) # Dummy data
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loss(x, y) # ~ 3</code></pre><p>Note that we convert both the parameters (<code>W</code>, <code>b</code>) and the data set (<code>x</code>, <code>y</code>) to cuda arrays. Taking derivatives and training works exactly as before.</p><p>If you define a structured model, like a <code>Dense</code> layer or <code>Chain</code>, you just need to convert the internal parameters. Flux provides <code>fmap</code>, which allows you to alter all parameters of a model at once.</p><pre><code class="language-julia">d = Dense(10, 5, σ)
d = fmap(cu, d)
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d.W # CuArray
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d(cu(rand(10))) # CuArray output
m = Chain(Dense(10, 5, σ), Dense(5, 2), softmax)
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m = fmap(cu, m)
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d(cu(rand(10)))</code></pre><p>As a convenience, Flux provides the <code>gpu</code> function to convert models and data to the GPU if one is available. By default, it&#39;ll do nothing, but loading <code>CuArrays</code> will cause it to move data to the GPU instead.</p><pre><code class="language-julia">julia&gt; using Flux, CuArrays
julia&gt; m = Dense(10,5) |&gt; gpu
Dense(10, 5)
julia&gt; x = rand(10) |&gt; gpu
10-element CuArray{Float32,1}:
0.800225
⋮
0.511655
julia&gt; m(x)
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5-element CuArray{Float32,1}:
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-0.30535
⋮
-0.618002</code></pre><p>The analogue <code>cpu</code> is also available for moving models and data back off of the GPU.</p><pre><code class="language-julia">julia&gt; x = rand(10) |&gt; gpu
10-element CuArray{Float32,1}:
0.235164
⋮
0.192538
julia&gt; x |&gt; cpu
10-element Array{Float32,1}:
0.235164
⋮
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0.192538</code></pre></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../training/training/">« Training</a><a class="docs-footer-nextpage" href="../saving/">Saving &amp; Loading »</a></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> on <span class="colophon-date" title="Thursday 16 April 2020 14:27">Thursday 16 April 2020</span>. Using Julia version 1.4.1.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
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