update retriever

wiki_mpnet_index.py

@@ -8,24 +8,24 @@ from sentence_transformers import SentenceTransformer
 
 class Retriever:
     def __init__(self):
+        self.archive = zipfile.ZipFile('data/en/paragraphs.zip', 'r')
         self.index = faiss.read_index("data/en/embs_IVF16384_HNSW32_2lvl_full.idx")
         self.index.nprobe = 128
         self.model = SentenceTransformer('sentence-transformers/all-mpnet-base-v2', device='cuda')
         self.model.max_seq_length = 512
-        
-        
+
+
     def get_paragraph_by_vec_idx(self, vec_idx):
-        archive = zipfile.ZipFile('data/en/paragraphs.zip', 'r')
         chunk_id = vec_idx // 100000
         line_id = vec_idx % 100000
-        with archive.open('enwiki_paragraphs_clean/enwiki_paragraphs_%03d.jsonl' % chunk_id) as f:
+        with self.archive.open('enwiki_paragraphs_clean/enwiki_paragraphs_%03d.jsonl' % chunk_id) as f:
             for i,l in enumerate(f):
                 if i == line_id:
                     data = json.loads(l)
                     break
         return data
-        
-        
+
+
     def search(self, query, k=5):
         emb = self.model.encode(query)
         _, neighbors = self.index.search(emb[np.newaxis, ...], k)
@@ -33,4 +33,4 @@ class Retriever:
         for n in neighbors[0]:
             data = get_paragraph_by_vec_idx(n)
             results.append(data)
-        return results
+        return results