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In the given text, the author mentions the use of nuclear principal component analysis (PCa) for image recognition. However, the author does not provide any additional details regarding the application of PCa in the image recognition process. In order to enhance the clarity of the text, it would be beneficial to include an explanation of how PCa is used to identify the images.
Furthermore, the author mentions the presence of 200 test and 200 training images, which are included in a compressed file. However, the author does not provide any information on the source of the images or the criteria used for selecting them. In order to provide more context to the reader, it would be helpful to include details on how the images were obtained and what factors were considered during the selection process.
Expanding on these points will not only make the text longer, but also provide the reader with a more comprehensive understanding of the image recognition process being discussed.