Add instructor model (#6)

- Add instructor model (9c6f23df2753bb8f9b1441f7eaa9cc1ca565d260)

utils/vector_index.py

@@ -5,7 +5,7 @@ def create_dense_embeddings(query, model, instruction=None):
     if instruction == None:
         dense_emb = model.encode([query]).tolist()
     else:
-        dense_emb = model.encoder([[instruction, query]]).tolist()
+        dense_emb = model.encode([[instruction, query]]).tolist()
     return dense_emb