database-vector
Mix.install(
[
{:postgrex, ">= 0.0.0"},
{:ecto_sql, "~> 3.11"},
{:pgvector, "~> 0.2.1"},
{:kino, "~> 0.12.3"}
],
config: [
demo: [
{:ecto_repos, [Demo.Repo]},
{Demo.Repo, [types: Demo.PostgrexTypes]}
]
]
)
Section
Running Postgres with pgvector
docker run -d --name pgvector-local -e POSTGRES_PASSWORD=postgres -p 5433:5432 pgvector/pgvector:pg16
Postgrex.Types.define(
Demo.PostgrexTypes,
[Pgvector.Extensions.Vector] ++ Ecto.Adapters.Postgres.extensions(),
[]
)
defmodule Demo.Repo do
use Ecto.Repo, adapter: Ecto.Adapters.Postgres, otp_app: :demo, types: Demo.PostgrexTypes
end
url = "postgres://postgres:postgres@localhost:5433/demo?sslmode=disable"
Kino.start_child!({Demo.Repo, url: url})
defmodule Demo.Migrations.CreateVectorExtension do
use Ecto.Migration
def up do
execute("CREATE EXTENSION IF NOT EXISTS vector")
end
def down do
execute("DROP EXTENSION vector")
end
end
defmodule Demo.Migrations.CreateTabel do
use Ecto.Migration
def change do
create table(:data) do
add(:embedding, :vector, size: 384)
end
end
end
migrations = [{0, Demo.Migrations.CreateVectorExtension}, {1, Demo.Migrations.CreateTabel}]
Ecto.Migrator.run(Demo.Repo, migrations, :down, all: true)
Ecto.Migrator.run(Demo.Repo, migrations, :up, all: true)
defmodule Demo.Data do
use Ecto.Schema
schema "data" do
field(:embedding, Pgvector.Ecto.Vector)
end
end
Demo.Repo.all(Demo.Data)
cat =
Demo.Repo.insert!(%Demo.Data{
embedding: [
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]
})
dog =
Demo.Repo.insert!(%Demo.Data{
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0.0797145664691925,
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0.027344979345798492,
0.09059284627437592,
3.432162855124821e-33,
0.06254414469003677,
0.02896781452000141,
5.441743996925652e-5,
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0.007902400568127632,
0.10791868716478348,
0.009035124443471432,
0.007591940928250551,
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0.00373834534548223,
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0.02170719765126705,
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0.011570456437766552,
0.018367605283856392,
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0.03941745311021805,
0.037535831332206726,
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0.11144452542066574,
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0.02390546351671219,
0.11009308695793152
]
})
# Get the nearest neighbors by L2 distance
my_query = [
0.03556492179632187,
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0.03832069784402847,
0.11054609715938568,
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0.0686739981174469,
1.3931990542914718e-4,
0.036622751504182816,
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6.628553965128958e-4,
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2.1897283254560272e-33,
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0.030799798667430878,
0.10340016335248947,
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0.030696656554937363,
0.018902964890003204,
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0.01928149349987507,
0.05614324286580086,
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0.04421387240290642,
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0.06123488023877144,
0.05231519788503647,
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0.0452398918569088,
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0.020179372280836105,
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0.01865093782544136,
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0.13888435065746307,
0.08317466825246811,
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0.035194966942071915
]
import Ecto.Query
import Pgvector.Ecto.Query
Demo.Repo.all(from(i in Demo.Data, order_by: l2_distance(i.embedding, ^my_query), limit: 1))
