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  <!-- Mathematics (9 chapters; v1.17.0 created the track, v1.20.0 renumbered these to their final 15-chapter slots, v1.21.0/v1.22.0 filled the 03 and 04 seats, v1.23.0 filled the 06 seat) -->
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  <url><loc>https://dw-learn.pages.dev/math/ch01-vectors.html</loc><lastmod>2026-09-16</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/math/ch02-matrices.html</loc><lastmod>2026-09-16</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/math/ch03-eigen.html</loc><lastmod>2026-09-16</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/math/ch04-svd.html</loc><lastmod>2026-09-16</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/math/ch05-derivatives.html</loc><lastmod>2026-09-16</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/math/ch06-chain-rule.html</loc><lastmod>2026-09-17</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/math/ch07-gradient.html</loc><lastmod>2026-09-16</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/math/ch14-divergence.html</loc><lastmod>2026-09-16</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/math/ch15-laplacian.html</loc><lastmod>2026-09-16</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <!-- Machine Learning (14 chapters) -->
  <url><loc>https://dw-learn.pages.dev/ml/ch01-linear-regression.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/ml/ch02-polynomial.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/ml/ch03-activation.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/ml/ch04-logistic.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/ml/ch05-mlp.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
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  <url><loc>https://dw-learn.pages.dev/ml/ch08-model-eval.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/ml/ch09-kmeans.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/ml/ch10-decision-tree.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/ml/ch11-pca.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/ml/ch12-cnn.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/ml/ch13-svm.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/ml/ch14-random-forest.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <!-- Deep Learning (10 chapters) -->
  <url><loc>https://dw-learn.pages.dev/dl/ch01-vanishing-gradient.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/dl/ch02-optimizers.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/dl/ch03-regularization-dl.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/dl/ch04-mnist.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/dl/ch05-autoencoder.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/dl/ch06-attention.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/dl/ch07-transformer.html</loc></url>
  <url><loc>https://dw-learn.pages.dev/dl/ch08-rnn.html</loc><lastmod>2026-08-06</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/dl/ch09-resnet.html</loc><lastmod>2026-08-06</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/dl/ch10-vit.html</loc><lastmod>2026-08-07</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <!-- Reinforcement Learning (13 chapters) -->
  <url><loc>https://dw-learn.pages.dev/rl/ch00-intro.html</loc><lastmod>2026-08-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
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  <url><loc>https://dw-learn.pages.dev/rl/ch03-mdp.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/rl/ch04-monte-carlo.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>https://dw-learn.pages.dev/rl/ch05-td-learning.html</loc><lastmod>2026-07-28</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
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  <url><loc>https://dw-learn.pages.dev/rl/ch11-rlhf.html</loc><lastmod>2026-08-05</lastmod><changefreq>monthly</changefreq><priority>0.8</priority></url>
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