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When you have too much data and you are going to use intensive algorithm such as training of classifier or clustering on the data. You will require too much time to process the data. If you use the pca or reshaping, It will get rid of redundancy as well as not useful data.

When you have too much data and you are going to use intensive algorithm such as training of classifier or clustering on the data. You will require too much time to process the data. If you use the pca or reshaping, It will get rid of redundancy as well as not useful data. data.