From ef01d6997a84f32d1f46c9cb134d4799368b659f Mon Sep 17 00:00:00 2001
From: Andy Lee <andylizf@outlook.com>
Date: Mon, 14 Jul 2025 13:15:55 -0700
Subject: [PATCH] fix: faiss only

---
 examples/faiss_only.py | 78 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 examples/faiss_only.py

diff --git a/examples/faiss_only.py b/examples/faiss_only.py
new file mode 100644
index 0000000..3c4c24a
--- /dev/null
+++ b/examples/faiss_only.py
@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+"""Test only Faiss HNSW"""
+import sys
+import time
+import psutil
+import gc
+
+def get_memory_usage():
+    process = psutil.Process()
+    return process.memory_info().rss / 1024 / 1024
+
+class MemoryTracker:
+    def __init__(self, name: str):
+        self.name = name
+        self.start_mem = get_memory_usage()
+        self.stages = []
+
+    def checkpoint(self, stage: str):
+        current_mem = get_memory_usage()
+        diff = current_mem - self.start_mem
+        print(f"[{self.name} - {stage}] Memory: {current_mem:.1f} MB (+{diff:.1f} MB)")
+        self.stages.append((stage, current_mem))
+        return current_mem
+
+    def summary(self):
+        peak_mem = max(mem for _, mem in self.stages)
+        print(f"Peak Memory: {peak_mem:.1f} MB")
+        return peak_mem
+
+def main():
+    import faiss
+    from llama_index.core import SimpleDirectoryReader, VectorStoreIndex, StorageContext, Settings
+    from llama_index.vector_stores.faiss import FaissVectorStore
+    from llama_index.embeddings.huggingface import HuggingFaceEmbedding
+
+    tracker = MemoryTracker("Faiss HNSW")
+    tracker.checkpoint("Initial")
+
+    embed_model = HuggingFaceEmbedding(model_name="facebook/contriever")
+    Settings.embed_model = embed_model
+    tracker.checkpoint("After embedding model setup")
+
+    d = 768
+    faiss_index = faiss.IndexHNSWFlat(d, 32)
+    faiss_index.hnsw.efConstruction = 64
+    tracker.checkpoint("After Faiss index creation")
+
+    documents = SimpleDirectoryReader("examples/data", recursive=True, encoding="utf-8", required_exts=[".pdf", ".txt", ".md"]).load_data()
+    tracker.checkpoint("After document loading")
+
+    print("Building Faiss HNSW index...")
+    vector_store = FaissVectorStore(faiss_index=faiss_index)
+    storage_context = StorageContext.from_defaults(vector_store=vector_store)
+    index = VectorStoreIndex.from_documents(documents, storage_context=storage_context)
+    tracker.checkpoint("After index building")
+
+    index.storage_context.persist("./storage_faiss")
+    tracker.checkpoint("After index saving")
+
+    query_engine = index.as_query_engine(similarity_top_k=20)
+    queries = [
+        "什么是盘古大模型以及盘古开发过程中遇到了什么阴暗面，任务令一般在什么城市颁发",
+        "What is LEANN and how does it work?",
+        "华为诺亚方舟实验室的主要研究内容",
+    ]
+
+    for i, query in enumerate(queries):
+        start_time = time.time()
+        _ = query_engine.query(query)
+        query_time = time.time() - start_time
+        print(f"Query {i + 1} time: {query_time:.3f}s")
+        tracker.checkpoint(f"After query {i + 1}")
+
+    peak_memory = tracker.summary()
+    print(f"Peak Memory: {peak_memory:.1f} MB")
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file