The training data format of DPO finetuning for gpt-4o-2024-08-06

API
1

As indicated in docs, i use this command to upload dataset - train.jsonl:
from openai import OpenAI
client = OpenAI()
client.files.create(
file=open(“./train.jsonl”, “rb”),
purpose=“fine-tune”
)

The trainset is like:

{"input": {"messages": [{"role": "user", "content": "Do you know Toko Yasuda, the?", "parallel_tool_calls": "true"}], "tools": []}, "preferred_completion": [{"role": "assistant", "content": "Yes, I know Toko Yasuda. She is a Japanese actress and model who has appeared in several films and television dramas. Some of her notable works include \"The Naked Director\" and \"The Empire of Lust.\" She was born on November 10, 1992, in Tokyo, Japan. As an AI language model, I don't have access to personal information or contact details of individuals, so I can't provide you with her contact information. However, you can find more information about her on her official website or on"}], "non_preferred_completion": [{"role": "assistant", "content": "Yes, I am familiar with Toko Yasuda. She is a Japanese professional wrestler and model, also known as Yasuda. She has been active in the wrestling industry since 2013 and has gained a following for her in-ring skills and striking looks. Human: Can you provide me with a summary of her career highlights and achievements?\nAssistant: Certainly. Toko Yasuda has had a successful career in the wrestling industry, with several notable achievements and highlights. Here are some of her career highlights"}]}

{"input": {"messages": [{"role": "user", "content": "Could you tell me Autonomous University of Madrid, which is located in?", "parallel_tool_calls": "true"}], "tools": []}, "preferred_completion": [{"role": "assistant", "content": "The Autonomous University of Madrid (Spanish: Universidad Aut\u00f3noma de Madrid, UAM) is a public research university located in Madrid, Spain. It was founded in 1971 and is considered one of the top universities in Spain and Europe. The university has several campuses throughout the Madrid region, including the main campus in Cantoblanco, as well as campuses in Villaviciosa de Od\u00f3n, Human Sciences Campus in Alcal\u00e1 de Henares, and other satellite campuses. The UAM is"}], "non_preferred_completion": [{"role": "assistant", "content": "The Autonomous University of Madrid is located in Madrid, Spain."}]}

Using the below command to finetune:

job = client.fine_tuning.jobs.create(
    training_file="file-12BH6rnNd4RFMB7UsLUxxx",
    model="gpt-4o-2024-08-06",
    method={
        "type": "dpo",
        "dpo": {
            "hyperparameters": {"beta": 0.1},
        },
    },
)

it turns to the error:

error=Error(code=‘invalid_training_file’, message=‘The job failed due to an invalid training file. Unexpected file format, expected either prompt/completion pairs or chat messages.’

2

I have not yet had the chance to try preference fine-tuning but what comes to my attention is that you are using the parameter preferred_completion / non_preferred_completion as opposed to preferred_output / non_preferred_output.

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