I am working on a project to detect cancer and I am using deep learning (Convolutional neural network). In the user interface, the user has only to input an image number then click test

when the user input the image number " the number of the image in the dataset " it will tell if this is a scan image of a person who has cancer or not.. also the dataset is used to train the model

I want to draw a use case diagram.. the primary actor will be the user but what about the secondary? is it going to be the dataset?