In unsupervised learning, _______ is a method where the objective is to group similar items into sets.

  • Principal Component Analysis
  • Regression Analysis
  • Hierarchical Clustering
  • Decision Trees
The correct term is "Hierarchical Clustering." In unsupervised learning, clustering is a method used to group similar items or data points into sets or clusters based on their similarities. Hierarchical clustering is one of the techniques for this purpose. It creates a tree-like structure (dendrogram) to represent the relationships between data points, making it easier to identify groups of similar items.
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