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<p>is typically constructed manually, which is much more expensive.</p>

<p>There are algorithms designed specifically for unsupervised learning, such as <a href="page.php?w=Cluster_analysis">clustering algorithms</a> like <a href="page.php?w=K-means_clustering">k-means</a>, <a href="page.php?w=dimensionality_reduction">dimensionality reduction</a> techniques like <a href="page.php?w=Principal_component_analysis">principal component analysis (PCA)</a>, <a href="page.php?w=Boltzmann_machine">Boltzmann machine learning</a>, and <a href="page.php?w=autoencoder">autoencoder</a>s.</p><p>
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