OpenAI Fine tuned engine not working in Node - "Engine not found" - node.js

Question

I have fine-tuned an engine on OpenAI using my own data. I can access the engine in the Playground with no issues, however, when I try to access it programmatically using Node & the openai Node library, I get an "Engine not found" error. The weird thing is, I could have sworn it worked before.
Anyway, here is my code:
const { Configuration, OpenAIApi } = require("openai");
const configuration = new Configuration({
apiKey: process.env.OPENAI_API_KEY,
});
const openai = new OpenAIApi(configuration);
async function getDream() {
const completion = await openai.createCompletion("davinci:ft-personal-2022-04-09-19-12-54", {
prompt: "I dreamed",
});
console.log(completion.data.choices[0].text);
}
getDream();
Here's the error:
error: {
message: 'Engine not found',
type: 'invalid_request_error',
param: null,
code: null
}
I tried running the same code but with a regular engine (davinci). Works fine that way. I've double-checked that I have the name of my fine-tuned engine right and tried it using the engine ID just in case. Nothing seems to work.
PS - I have run this using the OpenAI CLI as well using openai api completions.create -m davinci:ft-personal-2022-04-09-19-12-54 -p "I dreamed" and that works as well.

Answer 1

I'm back, answering my own question in hopes that it will help others.
It seems that if you are using your own fine-tuned model, you have to use a different method than if you use one of the default models. Instead of createCompletion, you should use createCompletionFromModel. So the function above (getDream) should actually look like this:
async function getDream() {
const response = await openai.createCompletionFromModel({
model: 'davinci:ft-personal-2022-04-09-19-12-54',
prompt: 'I dreamed'
// add other parameters here
});
}
You can add other completion parameters to this below prompt, e.g. temperature, frequency_penalty, etc.