MVP For Semantic Search using Sentence Transformers + FAISS

semantic_search.py

# install packages
# pip install faiss-cpu sentence-transformers

import numpy as np
import torch
import faiss
import time
from sentence_transformers import SentenceTransformer

# https://www.sbert.net/docs/pretrained_models.html#multi-qa-models
embedder = SentenceTransformer('multi-qa-MiniLM-L6-cos-v1')

# Corpus with example sentences
corpus = ['A man is eating food.',
          'A man is eating a piece of bread.',
          'The girl is carrying a baby.',
          'A man is riding a horse.',
          'A woman is playing violin.',
          'Two men pushed carts through the woods.',
          'A man is riding a white horse on an enclosed ground.',
          'A monkey is playing drums.',
          'A cheetah is running behind its prey.'
          ]
corpus_embeddings = embedder.encode(corpus, convert_to_tensor=True)

# get embedding dimension
embed_dim = embedder.get_sentence_embedding_dimension()

# index on faiss
index = faiss.IndexIDMap(faiss.IndexFlatIP(embed_dim))
index.add_with_ids(corpus_embeddings, np.array(range(0, len(corpus))))

# save index and read it for future!
faiss.write_index(index, 'my_index')
index = faiss.read_index('my_index')

def search(query):
   t=time.time()
   query_vector = embedder.encode([query])
   k = 5
   top_k = index.search(query_vector, k)
   print('totaltime: {}'.format(time.time()-t))
   return [corpus[_id] for _id in top_k[1].tolist()[0]]

# example query
query='music instrument'
results=search(query)
print('results :')
for result in results:
   print('\t',result)

I’m pretty new on ML, I tried this gist on colab and get this error on line 31

ValueError: input not a numpy array

any hints?

Works for me. 🤷‍♂️

I tried on Google Colab and shows that error. I installed faiss-gpu, maybe is another package?

Ok I saw you mention faiss-cpu on your gist and with that package works. Is there anyway to make it work using gpu?

I'm sure there are. You can google around for faiss-gpu examples.