### Install LatticeDB via CLI, Python, or Node.js

Source: https://latticedb.org

Installation commands for different environments.

```shell
curl -fsSL https://raw.githubusercontent.com/jeffhajewski/latticedb/main/dist/install.sh | bash
```

```python
pip install latticedb
```

```javascript
npm install @hajewski/latticedb
```

--------------------------------

### Initialize and Query LatticeDB in Python

Source: https://latticedb.org

Setup a database instance, perform transactional writes, and execute a vector-similarity query.

```python
from latticedb import Database
from latticedb.embedding import hash_embed

with Database("knowledge.db", create=True, enable_vectors=True, vector_dimensions=128) as db:
    with db.write() as txn:
        alice = txn.create_node(labels=["Person"], properties={"name": "Alice"})
        doc = txn.create_node(labels=["Document"], properties={"title": "Attention Is All You Need"})
        chunk = txn.create_node(labels=["Chunk"], properties={"text": "Self-attention..."})

        txn.set_vector(chunk.id, "embedding", hash_embed("transformer", dimensions=128))
        txn.create_edge(chunk.id, doc.id, "PART_OF")
        txn.create_edge(doc.id, alice.id, "AUTHORED_BY")
        txn.commit()

    results = db.query("""
        MATCH (chunk:Chunk)-[:PART_OF]->(doc:Document)-[:AUTHORED_BY]->(author:Person)
        WHERE chunk.embedding <=> $query < 0.5
        RETURN doc.title, chunk.text, author.name
        ORDER BY chunk.embedding <=> $query
        LIMIT 5
    """, parameters={"query": hash_embed("attention mechanism", dimensions=128)})

    for row in results:
        print(f"{row['doc.title']} by {row['author.name']}")
```

--------------------------------

### Initialize and Query LatticeDB in TypeScript

Source: https://latticedb.org

Asynchronous database operations including node creation, edge linking, and vector-based querying.

```typescript
import { Database } from "@hajewski/latticedb";
import { hashEmbed } from "@hajewski/latticedb/embedding";

const db = new Database("knowledge.db", {
  create: true, enableVectors: true, vectorDimensions: 128,
});
await db.open();

await db.write(async (txn) => {
  const alice = await txn.createNode({ labels: ["Person"], properties: { name: "Alice" } });
  const doc = await txn.createNode({ labels: ["Document"], properties: { title: "Attention Is All You Need" } });
  const chunk = await txn.createNode({ labels: ["Chunk"], properties: { text: "Self-attention..." } });

  await txn.setVector(chunk.id, "embedding", hashEmbed("transformer", 128));
  await txn.createEdge(chunk.id, doc.id, "PART_OF");
  await txn.createEdge(doc.id, alice.id, "AUTHORED_BY");
});

const results = await db.query(
  `MATCH (chunk:Chunk)-[:PART_OF]->(doc:Document)-[:AUTHORED_BY]->(author:Person)
   WHERE chunk.embedding <=> $query < 0.5
   RETURN doc.title, chunk.text, author.name
   ORDER BY chunk.embedding <=> $query
   LIMIT 5`,
  { query: hashEmbed("attention mechanism", 128) }
);

for (const row of results.rows) {
  console.log(`${row["doc.title"]} by ${row["author.name"]}`);
}

await db.close();
```

--------------------------------

### Construct and Query Graph with Cypher

Source: https://latticedb.org

Basic Cypher statements to create nodes and relationships, followed by a retrieval query.

```cypher
CREATE (alice:Person {name: "Alice"})
CREATE (doc:Document {title: "Attention Is All You Need"})
CREATE (c1:Chunk {text: "Self-attention..."})
CREATE (c2:Chunk {text: "Transformer blocks..."})

CREATE (c1)-[:PART_OF]->(doc)
CREATE (c2)-[:PART_OF]->(doc)
CREATE (doc)-[:AUTHORED_BY]->(alice)

MATCH (chunk:Chunk)-[:PART_OF]->(doc:Document)-[:AUTHORED_BY]->(author:Person)
RETURN doc.title, chunk.text, author.name;
```

--------------------------------

### Execute a multi-modal Cypher query

Source: https://latticedb.org

Perform vector similarity, full-text search, and graph traversal in a single query.

```cypher
-- Find chunks similar to a query, traverse to their document, then to the author
MATCH (chunk:Chunk)-[:PART_OF]->(doc:Document)-[:AUTHORED_BY]->(author:Person)
WHERE chunk.embedding <=> $query_vector < 0.3
  AND doc.content @@ "neural networks"
RETURN doc.title, chunk.text, author.name
ORDER BY chunk.embedding <=> $query_vector
LIMIT 10
```

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