Data Science and Machine Learning (Theory and Projects) A to Z - Dimensionality Reduction: The Principal Component Analy

The video tutorial discusses dimensionality reduction, focusing on Principal Component Analysis (PCA) as an unsupervised learning technique. It explains the challenges of high-dimensional data and the benefits of reducing dimensions, such as increased stability and reduced computational complexity. The tutorial contrasts unsupervised and supervised dimensionality reduction, using PCA and Fisher's Linear Discriminant (FLD) as examples. An illustrative example with image data demonstrates how PCA identifies subspaces to compress data without losing information. The video concludes with an overview of dimensionality reduction's role in machine learning and hints at future topics like deep learning.

How does PCA ensure that no information is lost during the dimensionality reduction process?

What distinguishes supervised dimensionality reduction techniques from unsupervised ones like PCA?

Discuss the importance of dimensionality reduction in the context of machine learning.