Nutcracker - Large Model Evaluation

Nutcracker is currently highly experimental

Nutcracker is like LM-Eval-Harness but without PyTorch madness. use this to evaluate LLMs served through APIs

demo.mp4

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Installation

Route 1. PyPI

Install Nutcracker

pip install nutcracker-py

Download Nutcracker DB

git clone https://github.com/evaluation-tools/nutcracker-db

Route 2. GitHub

Install Nutcracker

git clone https://github.com/evaluation-tools/nutcracker
pip install -e nutcracker

Download Nutcracker DB

git clone https://github.com/evaluation-tools/nutcracker-db

Check all tasks implemented in Nutcracker DB's readme page.

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QuickStart

Case Study: Evaluate (Any) LLM API on TruthfulQA (Script)

STEP 1: Define Model

• Define a simple model class with a "respond(self, user_prompt)" function.
• We will use OpenAI here. But really, any api can be evaluated if the "respond(self, user_prompt)" function that returns LLM response in string exists. Get creative (Hugginface API, Anthropic API, Replicate API, OLLaMA, and etc.)

from openai import OpenAI
import os, logging, sys
logging.basicConfig(level=logging.INFO)
logging.getLogger('httpx').setLevel(logging.CRITICAL)
os.environ["OPENAI_API_KEY"] = ""
client = OpenAI()

class ChatGPT:
    def __init__(self):
        self.model = "gpt-3.5-turbo"

    def respond(self, user_prompt):
        response_data = None
        while response_data is None:
            try:
                completion = client.chat.completions.create(
                    model=self.model,
                    messages=[
                        {"role": "user", "content": f"{user_prompt}"}
                    ],
                    timeout=15,
                )
                response_data = completion.choices[0].message.content
                break
            except KeyboardInterrupt:
                sys.exit()
            except:
                print("Request timed out, retrying...")
        return response_data

STEP 2: Run Evaluation

from nutcracker.data import Task, Pile
from nutcracker.runs import Schema
from nutcracker.evaluator import MCQEvaluator, generate_report

# this db_directory value should work off-the-shelf if you cloned both repositories in the same directory
truthfulqa = Task.load_from_db(task_name='truthfulqa-mc1', db_directory='nutcracker-db/db')

# sample 20 for demo
truthfulqa.sample(20, in_place=True)

# running this experiment updates each instance's model_response property in truthfulqa data object with ChatGPT responses
experiment = Schema(model=ChatGPT(), data=truthfulqa)
experiment.run()

# running this evaluation updates each instance's response_correct property in truthfulqa data object with evaluations
evaluation = MCQEvaluator(data=truthfulqa)
evaluation.run()

for i in range (0, len(truthfulqa)):
    print(truthfulqa[i].user_prompt)
    print(truthfulqa[i].model_response)
    print(truthfulqa[i].correct_options)
    print(truthfulqa[i].response_correct)
    print()

print(generate_report(truthfulqa, save_path='accuracy_report.txt'))

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Case Study: Task vs. Pile? Evaluating LLaMA on MMLU (Script)

STEP 1: Understand the basis of Nutcracker

• Despite our lengthy history of model evaluation, my understanding of the field is that we have not reached a clear consensus on what a "benchmark" is (Is MMLU a "benchmark"? Is Huggingface Open LLM leaderboard a "benchmark"?).
• Instead of using the word benchmark, Nutcracker divides the data structure into Instance, Task, and Pile (See blog post: HERE)
• Nutcracker DB is constructed on the Task-level but you can call multiple Tasks together on the Pile-level.

STEP 2: Define Model

• Since we've tried OpenAI API above, let's now try Hugginface Inference Endpoint. Most open-source models are accessible through this option. (See blog post: HERE)

class LLaMA:
    def __init__(self):
        self.API_URL = "https://xxxx.us-east-1.aws.endpoints.huggingface.cloud"

    def query(self, payload):
        headers = {
            "Accept" : "application/json",
            "Authorization": "Bearer hf_XXXXX",
            "Content-Type": "application/json" 
        }
        response = requests.post(self.API_URL, headers=headers, json=payload)
        return response.json()

    def respond(self, user_prompt):
        output = self.query({
            "inputs": f"<s>[INST] <<SYS>> You are a helpful assistant. You keep your answers short. <</SYS>> {user_prompt}",
        })
        return output[0]['generated_text']

STEP 3: Load Data

from nutcracker.data import Pile
import logging
logging.basicConfig(level=logging.INFO)

mmlu = Pile.load_from_db('mmlu','nutcracker-db/db')

STEP 4: Run Experiment (Retrieve Model Responses)

• Running evaluation updates each instance's model_response attribute within the data object, which is mmlu Pile in this case.
• You can save data object at any step of the evaluation. Let's try saving this time to prevent API requesting again in case anything happens.

from nutcracker.runs import Schema
mmlu.sample(n=1000, in_place = True)

experiment = Schema(model=LLaMA(), data=mmlu)
experiment.run()
mmlu.save_to_file('mmlu-llama.pkl')

• You can load and check how the model responded.

loaded_mmlu = Pile.load_from_file('mmlu-llama.pkl')
for i in range (0,len(loaded_mmlu)):
    print("\n\n\n---\n")
    print("Prompt:")
    print(loaded_mmlu[i].user_prompt)
    print("\nResponses:")
    print(loaded_mmlu[i].model_response)

STEP 5: Run Evaluation

• LLMs often don’t respond in immediately recognizable letters like A, B, C, or D.
• Therefore, Nutcracker supports an intent-matching feature (requires OpenAI API Key) that parses model response to match discrete labels, but let’s disable that for now and proceed with our evaluation.
• We recommend using intent-matching for almost all use cases. We will publish a detailed research later.

from nutcracker.evaluator import MCQEvaluator, generate_report
evaluation = MCQEvaluator(data=loaded_mmlu, disable_intent_matching=True)
evaluation.run()
print(generate_report(loaded_mmlu, save_path='accuracy_report.txt'))

results.mov

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Tutorials

• Evaluating on HuggingFace Inference Endpoints -> HERE / Medium
• Understanding Instance-Task-Pile -> HERE / Medium