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Copy pathexample.cpp
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74 lines (63 loc) · 2.28 KB
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#include <iostream>
#include <string>
#include <vector>
#include <cpr/cpr.h>
#include <nlohmann/json.hpp>
#include <pgvector/pqxx.hpp>
#include <pqxx/pqxx>
using json = nlohmann::json;
// https://platform.openai.com/docs/guides/embeddings/how-to-get-embeddings
// input can be an array with 2048 elements
std::vector<std::vector<float>> embed(const std::vector<std::string>& input, char* api_key) {
std::string url{"https://api.openai.com/v1/embeddings"};
json data{{"input", input}, {"model", "text-embedding-3-small"}};
cpr::Response r = cpr::Post(
cpr::Url{url},
cpr::Body{data.dump()},
cpr::Bearer{api_key},
cpr::Header{{"Content-Type", "application/json"}}
);
if (r.status_code != 200) {
throw std::runtime_error{"Bad status: " + std::to_string(r.status_code)};
}
json response = json::parse(r.text);
std::vector<std::vector<float>> embeddings;
for (const auto& v : response["data"]) {
embeddings.emplace_back(v["embedding"]);
}
return embeddings;
}
int main() {
char* api_key = std::getenv("OPENAI_API_KEY");
if (!api_key) {
std::cout << "Set OPENAI_API_KEY" << std::endl;
return 1;
}
pqxx::connection conn{"dbname=pgvector_example"};
pqxx::nontransaction tx{conn};
tx.exec("CREATE EXTENSION IF NOT EXISTS vector");
tx.exec("DROP TABLE IF EXISTS documents");
tx.exec(
"CREATE TABLE documents (id bigserial PRIMARY KEY, content text, embedding vector(1536))"
);
std::vector<std::string> input{
"The dog is barking", "The cat is purring", "The bear is growling"
};
std::vector<std::vector<float>> embeddings = embed(input, api_key);
for (size_t i = 0; i < input.size(); i++) {
tx.exec(
"INSERT INTO documents (content, embedding) VALUES ($1, $2)",
pqxx::params{input[i], pgvector::Vector{embeddings[i]}}
);
}
std::string query{"forest"};
std::vector<float> query_embedding = embed({query}, api_key)[0];
pqxx::result result = tx.exec(
"SELECT content FROM documents ORDER BY embedding <=> $1 LIMIT 5",
pqxx::params{pgvector::Vector{query_embedding}}
);
for (const auto& row : result) {
std::cout << row[0].as<std::string>() << std::endl;
}
return 0;
}