Updated Cohere example [skip ci]

Author: ankane

examples/cohere/src/main.rs

@@ -13,7 +13,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     client.execute("CREATE EXTENSION IF NOT EXISTS vector", &[])?;
     client.execute("DROP TABLE IF EXISTS documents", &[])?;
     client.execute(
-        "CREATE TABLE documents (id serial PRIMARY KEY, content text, embedding bit(1024))",
+        "CREATE TABLE documents (id serial PRIMARY KEY, content text, embedding bit(1536))",
         &[],
     )?;
 
@@ -47,11 +47,11 @@ fn main() -> Result<(), Box<dyn Error>> {
 fn embed(texts: &[&str], input_type: &str) -> Result<Vec<Vec<u8>>, Box<dyn Error>> {
     let api_key = std::env::var("CO_API_KEY").or(Err("Set CO_API_KEY"))?;
 
-    let response: Value = ureq::post("https://api.cohere.com/v1/embed")
+    let response: Value = ureq::post("https://api.cohere.com/v2/embed")
         .header("Authorization", &format!("Bearer {}", api_key))
         .send_json(serde_json::json!({
             "texts": texts,
-            "model": "embed-english-v3.0",
+            "model": "embed-v4.0",
             "input_type": input_type,
             "embedding_types": &["ubinary"],
         }))?