concern for most data scientists is the labeled data as we ourselves face the same problem while building a model for wound tissue classification it is very difficult to get an expert to label the whole set of data thus the scarcity of label data is the major con constraint for supervised machine learning now here is where the semi-supervised machine learning plays a major role which takes the advantages of both supervised machine learning and unsupervised machine learning to give us label data and according to the authors of the paper