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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Robert Ruidisch — Signal Processing ML Engineer</title>
<meta name="description" content="Portfolio of Robert Ruidisch — Signal Processing ML Engineer. Open-source contributions to NumPy, SciPy, Hugging Face TRL, and more.">
<link rel="preconnect" href="https://fonts.googleapis.com">
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap" rel="stylesheet">
<link rel="stylesheet" href="assets/style.css">
<link rel="icon" type="image/svg+xml" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'><text y='28' font-size='28'>🐙</text></svg>">
</head>
<body>
<nav>
<div class="container">
<a href="/" class="logo"><span>r</span>obrui</a>
<div class="nav-links">
<a href="/" class="active">Home</a>
<a href="projects/">Contributions</a>
<a href="blog/">Blog</a>
</div>
</div>
</nav>
<section class="hero">
<div class="container">
<h1>Signal Processing <span>ML Engineer</span></h1>
<p class="subtitle">
Open-source contributor. Time series & speech processing. Making scientific Python better for everyone.
</p>
<p class="tagline">
TU München MSc · <a href="blog/">6 deep-dives</a> into NumPy, SciPy, Hugging Face TRL, Unit8 darts & more
</p>
<div class="btn-row">
<a href="projects/" class="btn btn-primary">Browse Deep-Dives →</a>
<a href="https://github.com/robrui" class="btn btn-outline">GitHub</a>
<a href="https://www.linkedin.com/in/robert-ruidisch/" class="btn btn-outline">LinkedIn</a>
</div>
</div>
</section>
<section class="section">
<div class="container">
<h2 class="section-title">Featured Contributions</h2>
<div class="card-grid card-grid-2">
<div class="card">
<h3><a href="posts/scipy-25074-find-peaks-cwt/">SNR Bug in <code>scipy.signal.find_peaks_cwt</code></a></h3>
<div class="meta">
<span>🔧 scipy#25074</span>
<span>📅 Apr 2025</span>
</div>
<p>
Found and fixed a bug in SciPy's CWT peak detector where SNR was computed at
the <em>end</em> of each ridge instead of its maximum — causing false negatives
on real-world signals.
</p>
<div class="card-tags">
<span class="tag">DSP</span>
<span class="tag">CWT</span>
<span class="tag">scipy</span>
</div>
</div>
<div class="card">
<h3><a href="posts/trl-5644-gemma-token-type-ids/">Gemma-3 <code>token_type_ids</code> Support in TRL</a></h3>
<div class="meta">
<span>🔧 <a href="https://github.com/huggingface/trl/pull/5644" style="color:var(--accent);text-decoration:none;">trl#5644</a></span>
<span>📅 Mar 2025</span>
</div>
<p>
Added <code>token_type_ids</code> handling for gemma-3 in Hugging Face's TRL library,
fixing crashes during RL training with packed sequences.
</p>
<div class="card-tags">
<span class="tag tag-purple">RLHF</span>
<span class="tag tag-purple">transformers</span>
<span class="tag tag-purple">trl</span>
</div>
</div>
<div class="card">
<h3><a href="posts/coreforecast-131-python-optimize/"><code>PYTHONOPTIMIZE=2</code> Crash in coreforecast</a></h3>
<div class="meta">
<span>🔧 <a href="https://github.com/Nixtla/coreforecast/pull/131" style="color:var(--accent);text-decoration:none;">coreforecast#131</a></span>
<span>📅 Feb 2025</span>
</div>
<p>
Diagnosed a segmentation fault in Nixtla's coreforecast when Python runs with
<code>-OO</code> (optimize level 2): <code>__debug__</code>-guarded <code>assert</code> statements
broke runtime control flow.
</p>
<div class="card-tags">
<span class="tag tag-orange">Python Internals</span>
<span class="tag tag-orange">C Extensions</span>
</div>
</div>
<div class="card">
<h3><a href="posts/darts-3087-float16-tft/">Float16 Training for TFT Model in darts</a></h3>
<div class="meta">
<span>🔧 <a href="https://github.com/unit8co/darts/pull/3087" style="color:var(--accent);text-decoration:none;">darts#3087</a></span>
<span>📅 Mar 2025</span>
</div>
<p>
Enabled mixed-precision (float16) training for the Temporal Fusion Transformer
in Unit8's darts library, delivering 2× throughput on compatible hardware.
</p>
<div class="card-tags">
<span class="tag tag-green">Time Series</span>
<span class="tag tag-green">Deep Learning</span>
<span class="tag tag-green">darts</span>
</div>
</div>
</div>
</div>
</section>
<section class="section">
<div class="container">
<h2 class="section-title">Why Deep-Dives?</h2>
<div style="max-width: 680px;">
<p>
Every open-source contribution tells a story. Behind every PR is a bug that
took hours to find, a subtle API contract that needed fixing, or a performance
optimization that required deep understanding of the underlying math.
</p>
<p style="margin-top: 12px;">
These deep-dives capture <strong>what</strong> changed, <strong>why</strong> it matters,
and <strong>how</strong> you'd find and fix it yourself — with theory, code, and
visualizations. Think of them as the "director's commentary" for my PRs.
</p>
</div>
</div>
</section>
<footer>
<div class="container">
<div class="social-links">
<a href="https://github.com/robrui">GitHub</a>
<a href="https://www.linkedin.com/in/robert-ruidisch/">LinkedIn</a>
<a href="mailto:robert.ruidisch@gmail.com">Email</a>
</div>
<p>© 2025 Robert Ruidisch · Built with ❤️ for open source</p>
</div>
</footer>
</body>
</html>