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<html lang="en"><head><meta charset="UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><title>Performance Tips · Flux</title><script>(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
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sum(zip(xs, ys)) do (x, y_target)
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y_pred = model(x) # evaluate the model
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return loss(y_pred, y_target)
end
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end</code></pre><p>It is much faster to concatenate them into a matrix, as this will hit BLAS matrix-matrix multiplication, which is much faster than the equivalent sequence of matrix-vector multiplications. The improvement is enough that it is worthwhile allocating new memory to store them contiguously.</p><pre><code class="language-julia">x_batch = reduce(hcat, xs)
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y_batch = reduce(hcat, ys)
...
function loss_total(x_batch::Matrix, y_batch::Matrix)
y_preds = model(x_batch)
sum(loss.(y_preds, y_batch))
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end</code></pre><p>When doing this kind of concatenation use <code>reduce(hcat, xs)</code> rather than <code>hcat(xs...)</code>. This will avoid the splatting penalty, and will hit the optimised <code>reduce</code> method.</p></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../utilities/">« Utility Functions</a><a class="docs-footer-nextpage" href="../datasets/">Datasets »</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="Tuesday 12 May 2020 15:31">Tuesday 12 May 2020</span>. Using Julia version 1.3.1.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
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