ЁЯФН What is PCA in ML? #shorts #coding

4 Jul 2025 ┬╖ 1 min
1:28

In this Hindi YouTube short, Akansha Yadav illustrates why a model built on a dataset with thirty features performed poorly and how applying Principal Component Analysis (PCA) can improve accuracy. She explains that PCA transforms the original thirty features into a smaller set of orthogonal components, compressing the data and removing strong multicollinearity. When she reduced the feature set to five principal components, the modelтАЩs accuracy increased. Akansha clarifies that the improvement signals that the original features were duplicate or highly related, not that PCA adds new information. She emphasizes that PCA does not create new features; it merely decorrelates and compresses existing ones, yielding stronger signals for the model. The video concludes with a recommendation to use PCA whenever data is confusing due to many correlated features, positioning PCA as an essential technique to learn.

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