Checkpoint check for dimensionality reduction

[oguzhanbsolak]

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Adds a checkpoint check for dimensionality reduction. If the checkpoint already exists, there is no need to run the dimensionality reduction command.

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This PR has been marked stale because it has been open for for over 30 days with no activity. It will be closed automatically in 10 days unless a comment is added or the "Stale" label is removed.

[oguzhanbsolak]

With the replacement of the face detection library, the need for the imutils package has ended. Since it's a small change, I added it here instead of creating a new PR.