              precision    recall  f1-score   support

           0       0.85      0.71      0.77       100
           1       0.75      0.87      0.81       100

    accuracy                           0.79       200
   macro avg       0.80      0.79      0.79       200
weighted avg       0.80      0.79      0.79       200

Model Usage

For best results, we recommend starting with the following prompting strategy (and encourage tweaks as you see fit):

python

def format_input(reference, query, response):
    prompt = f"""Your job is to evaluate whether a machine learning model has hallucinated or not.
    A hallucination occurs when the response is coherent but factually incorrect or nonsensical
    outputs that are not grounded in the provided context.
    You are given the following information:
    ####INFO####
    [Knowledge]: {reference}
    [User Input]: {query}
    [Model Response]: {response}
    ####END INFO####
    Based on the information provided is the model output a hallucination? Respond with only "yes" or "no"
    """
    return input

text = format_input(query='Based on the follwoing
          <context>Walrus are the largest mammal</context>
          answer the question
          <query> What is the best PC?</query>',
          response='The best PC is the mac')

messages = [
    {"role": "user", "content": text}
]

pipe = pipeline(
    "text-generation",
    model=base_model,
    model_kwargs={"attn_implementation": attn_implementation, "torch_dtype": torch.float16},
    tokenizer=tokenizer,
)
generation_args = {
      "max_new_tokens": 2,
      "return_full_text": False,
      "temperature": 0.01,
      "do_sample": True,
  }

output = pipe(messages, **generation_args)
print(f'Hallucination: {output[0]['generated_text'].strip().lower()}')
# Hallucination: yes

Comparison with Other Models

We compared our merged model's performance on the hallucination detection benchmark against several other state-of-the-art language models:

Model	Precision	Recall	F1
Our Merged Model	0.75	0.87	0.81
GPT-4	0.93	0.72	0.82
GPT-4 Turbo	0.97	0.70	0.81
Gemini Pro	0.89	0.53	0.67
GPT-3.5	0.89	0.65	0.75
GPT-3.5-turbo-instruct	0.89	0.80	0.84
Palm 2 (Text Bison)	1.00	0.44	0.61
Claude V2	0.80	0.95	0.87

As shown in the table, our merged model achieves one of the highest F1 scores of 0.81, outperforming several other state-of-the-art language models on this hallucination detection task.

We will continue to improve and fine-tune our merged model to achieve even better performance across various benchmarks and tasks.

Citations: Scores from arize/phoenix

Training Data

@misc{HaluEval, author = {Junyi Li and Xiaoxue Cheng and Wayne Xin Zhao and Jian-Yun Nie and Ji-Rong Wen }, title = {HaluEval: A Large-Scale Hallucination Evaluation Benchmark for Large Language Models}, year = {2023}, journal={arXiv preprint arXiv:2305.11747}, url={https://arxiv.org/abs/2305.11747} }

Framework versions

PEFT 0.11.1
Transformers 4.41.2
Pytorch 2.3.0+cu121
Datasets 2.19.2
Tokenizers 0.19.1

Training hyperparameters

The following hyperparameters were used during training:

learning_rate: 0.0001
train_batch_size: 2
eval_batch_size: 8
seed: 42
gradient_accumulation_steps: 4
total_train_batch_size: 8
optimizer: Adam with betas=(0.9,0.999) and epsilon=1e-08
lr_scheduler_type: linear
lr_scheduler_warmup_steps: 10
training_steps: 150

Framework versions

PEFT 0.11.1
Transformers 4.41.2
Pytorch 2.3.0+cu121
Datasets 2.19.2
Tokenizers 0.19.1

grounded-ai/phi3-hallucination-judge-merge

Merged Model Performance

Hallucination Detection Metrics

Model Usage

Comparison with Other Models

Training Data

Framework versions

Training hyperparameters

Framework versions

grounded-ai/
phi3-hallucination-judge-merge