Update copy_of_hw1.py

copy_of_hw1.py

@@ -230,7 +230,6 @@ class BM25Index(InvertedIndex):
         )
         return index
 
-
 from nlp4web_codebase.ir.models import BaseRetriever
 from typing import Type
 from abc import abstractmethod
@@ -293,3 +292,13 @@ class BM25Retriever(BaseInvertedIndexRetriever):
     @property
     def index_class(self) -> Type[BM25Index]:
         return BM25Index
+
+best_b, best_k1 = 0.8, 0.5
+bm25_index = BM25Index.build_from_documents(
+    documents=iter(sciq.corpus),
+    ndocs=12160,
+    show_progress_bar=True,
+    k1=best_k1,
+    b=best_b
+)
+bm25_index.save("output/bm25_index")