Cosine Similarity Score to be implemented.

https://github.com/Aditya7799/SE_Project/blob/bb2b43caaf27ea29019ccef5025dd9ef720167e1/src/utils/PreRetrieval_Metrics.py#L473

The function `simscore(doc1,doc2)` takes in two arguments doc1 and doc2 which are (absolute) paths the two documents. We need to convert the documents to vectors and return the calculated similarity score.