http://programmer.ie/tags/view/ Recent content in View on Programmer.ie: Modern AI programming Hugo en-us Sat, 08 Aug 2026 12:45:00 +0100 http://programmer.ie/post/pytorch-zero-to-hero-01/ Sat, 08 Aug 2026 12:45:00 +0100 http://programmer.ie/post/pytorch-zero-to-hero-01/ <h2 id="pytorch-zero-to-hero--step-01">PyTorch: Zero to Hero — Step 01</h2> <p>Most PyTorch bugs are not really &ldquo;AI bugs&rdquo;.</p> <p>They are shape bugs.</p> <p>You expected:</p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-text" data-lang="text"><span style="display:flex;"><span>[batch, features] </span></span></code></pre></div><p>but actually had:</p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-text" data-lang="text"><span style="display:flex;"><span>[batch, sequence, features] </span></span></code></pre></div><p>You expected two tensors to line up.</p> <p>They broadcast instead.</p> <p>You called <code>view()</code> after <code>permute()</code> and got a contiguity error.</p> <p>You removed a dimension with <code>squeeze()</code> and accidentally removed the batch dimension too.</p> <p>Or you reached the familiar message:</p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-text" data-lang="text"><span style="display:flex;"><span>RuntimeError: The size of tensor a (...) must match the size of tensor b (...) </span></span></code></pre></div><p>This article is about becoming dangerous enough with tensors that these errors stop being mysterious.</p>