Does Eigenface method use unsupervised trainning
Eigenfaces require supervised learning.  You generally supply several of each subject, classifying them by identifying the subject.  The eigenface model then classifies later images (often real-time snapshots) as to identity.
Eigenface method is a powerful method in face recognition. It uses the training images to find the eigenfaces and then use these eigenfaces to represent a new test image. Do the images in training dataset need to be labeled, or it is unsupervised training?