pgvector support for Lua
Supports pgmoon
Run:
luarocks install pgvectorAnd follow the instructions for your database library:
Require the library
local pgvector = require("pgvector")Enable the extension
pg:query("CREATE EXTENSION IF NOT EXISTS vector")Create a table
pg:query("CREATE TABLE items (id bigserial PRIMARY KEY, embedding vector(3))")Insert a vector
embedding = pgvector.new({1, 1, 1})
pg:query("INSERT INTO items (embedding) VALUES ($1)", embedding)Get the nearest neighbors
embedding = pgvector.new({1, 1, 1})
local res = pg:query("SELECT * FROM items ORDER BY embedding <-> $1 LIMIT 5", embedding)
for i, row in ipairs(res) do
for k, v in pairs(row) do
print(k, v)
end
endAdd an approximate index
pg:query("CREATE INDEX ON items USING hnsw (embedding vector_l2_ops)")
-- or
pg:query("CREATE INDEX ON items USING ivfflat (embedding vector_l2_ops) WITH (lists = 100)")Use vector_ip_ops for inner product and vector_cosine_ops for cosine distance
See a full example
View the changelog
Everyone is encouraged to help improve this project. Here are a few ways you can help:
- Report bugs
- Fix bugs and submit pull requests
- Write, clarify, or fix documentation
- Suggest or add new features
To get started with development:
git clone https://github.com/pgvector/pgvector-lua.git
cd pgvector-lua
createdb pgvector_lua_test
luarocks install pgmoon
luarocks install luasocket
lua test/example.lua