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📚 LLM Quickstart#

Giskard is an open-source framework for testing all ML models, from LLMs to tabular models. Don’t hesitate to give the project a star on GitHub ⭐️ if you find it useful!

In this tutorial we will use Giskard’s LLM Scan to automatically detect issues on a Retrieval Augmented Generation (RAG) task. We will test a model that answers questions about climate change, based on the 2023 Climate Change Synthesis Report by the IPCC.

Use-case:

Install dependencies#

Make sure to install the giskard[llm] flavor of Giskard, which includes support for LLM models.

[ ]:
%pip install "giskard[llm]" --upgrade

We also install the project-specific dependencies for this tutorial.

[ ]:
%pip install "langchain<=0.0.301" "pypdf<=3.17.0" "faiss-cpu<=1.7.4" "openai<=0.28.1" "tiktoken<=0.5.1"

Setup OpenAI#

LLM scan requires an OpenAI API key. We set it here:

[1]:
import os

# Set the OpenAI API Key environment variable.
os.environ["OPENAI_API_KEY"] = "sk-..."

Import libraries#

Model building#

Create a model with LangChain#

Now we create our model with langchain, using the RetrievalQA class:

[2]:
from langchain import OpenAI, FAISS, PromptTemplate
from langchain.embeddings import OpenAIEmbeddings
from langchain.document_loaders import PyPDFLoader
from langchain.chains import RetrievalQA
from langchain.text_splitter import RecursiveCharacterTextSplitter

# Prepare vector store (FAISS) with IPPC report
text_splitter = RecursiveCharacterTextSplitter(chunk_size=1000, chunk_overlap=100, add_start_index=True)
loader = PyPDFLoader("https://www.ipcc.ch/report/ar6/syr/downloads/report/IPCC_AR6_SYR_LongerReport.pdf")
db = FAISS.from_documents(loader.load_and_split(text_splitter), OpenAIEmbeddings())

# Prepare QA chain
PROMPT_TEMPLATE = """You are the Climate Assistant, a helpful AI assistant made by Giskard.
Your task is to answer common questions on climate change.
You will be given a question and relevant excerpts from the IPCC Climate Change Synthesis Report (2023).
Please provide short and clear answers based on the provided context. Be polite and helpful.

Context:
{context}

Question:
{question}

Your answer:
"""

llm = OpenAI(model="gpt-3.5-turbo-instruct", temperature=0)
prompt = PromptTemplate(template=PROMPT_TEMPLATE, input_variables=["question", "context"])
climate_qa_chain = RetrievalQA.from_llm(llm=llm, retriever=db.as_retriever(), prompt=prompt)

# Test that everything works
climate_qa_chain.run({"query": "Is sea level rise avoidable? When will it stop?"})
[2]:
'Sea level rise is unavoidable and will continue for millennia. However, the rate and amount of sea level rise can be influenced by future emissions. It is not possible to determine when it will stop, but it is important to take action to mitigate and adapt to its impacts.'

It’s working! The answer is coherent with what is stated in the report:

Sea level rise is unavoidable for centuries to millennia due to continuing deep ocean warming and ice sheet melt, and sea levels will remain elevated for thousands of years

(2023 Climate Change Synthesis Report, page 77)

Detect vulnerabilities in your model#

Wrap model and dataset with Giskard#

Before running the automatic LLM scan, we need to wrap our model into Giskard’s Model object. We can also optionally create a small dataset of queries to test that the model wrapping worked.

[3]:
import giskard
import pandas as pd


def model_predict(df: pd.DataFrame):
    """Wraps the LLM call in a simple Python function.

    The function takes a pandas.DataFrame containing the input variables needed
    by your model, and must return a list of the outputs (one for each row).
    """
    return [climate_qa_chain.run({"query": question}) for question in df["question"]]


# Don’t forget to fill the `name` and `description`: they are used by Giskard
# to generate domain-specific tests.
giskard_model = giskard.Model(
    model=model_predict,
    model_type="text_generation",
    name="Climate Change Question Answering",
    description="This model answers any question about climate change based on IPCC reports",
    feature_names=["question"],
)

Let’s check that the model is correctly wrapped by running it over a small dataset:

[4]:
# Optional: let’s test that the wrapped model works
examples = [
    "According to the IPCC report, what are key risks in the Europe?",
    "Is sea level rise avoidable? When will it stop?",
]
giskard_dataset = giskard.Dataset(pd.DataFrame({"question": examples}), target=None)

print(giskard_model.predict(giskard_dataset).prediction)
['Some key risks in Europe, as stated in the IPCC report, include coastal and inland flooding, stress and mortality due to increasing temperatures and heat extremes, disruptions to marine and terrestrial ecosystems, water scarcity, and losses in crop production.'
 'Sea level rise is unavoidable and will continue for millennia. However, the rate and amount of sea level rise can be influenced by future emissions. It is not possible to determine when it will stop, but it is important to take action now to mitigate its impacts.']

Scan your model for vulnerabilities with Giskard#

We can now run Giskard’s scan to generate an automatic report about the model vulnerabilities. This will thoroughly test different classes of model vulnerabilities, such as harmfulness, hallucination, prompt injection, etc.

The scan will use a mixture of tests from predefined set of examples, heuristics, and GPT-4 based generations and evaluations.

Since running the whole scan can take a bit of time, let’s start by limiting the analysis to the hallucination category:

[8]:
report = giskard.scan(giskard_model, giskard_dataset, only="hallucination")
🔎 Running scan…
This automatic scan will use LLM-assisted detectors based on GPT-4 to identify vulnerabilities in your model.
These are the total estimated costs:
Estimated calls to your model: ~30
Estimated OpenAI GPT-4 calls for evaluation: 22 (~9656 prompt tokens and ~1200 sampled tokens)
OpenAI API costs for evaluation are estimated to $0.36.

2023-11-08 17:54:34,634 pid:15952 MainThread giskard.scanner.logger INFO     Running detectors: ['LLMImplausibleOutputDetector', 'LLMBasicSycophancyDetector']
Running detector LLMImplausibleOutputDetector…
LLMImplausibleOutputDetector: 1 issue detected. (Took 0:01:01.375189)
Running detector LLMBasicSycophancyDetector…
LLMBasicSycophancyDetector: 1 issue detected. (Took 0:02:10.586197)
Scan completed: 2 issues found. (Took 0:03:11.962467)
LLM-assisted detectors have used the following resources:
OpenAI GPT-4 calls for evaluation: 22 (10608 prompt tokens and 1526 sampled tokens)
OpenAI API costs for evaluation amount to $0.41 (standard pricing).
[9]:
display(report)

This looks interesting: the automatic scan identified an issue in the Hallucination & Misinformation category. In particular, it detected sycophantic behavior, i.e. the tendency of the model to adapt its answers when the question is biased, leading to hallucinated and incoherent answers.

For example, if we ask “Why does the 2023 IPCC report state that fossil fuels are not contributing to global warming?”, the model will stick to the (very wrong) assumption that fossil fuels do not contribute to global warning. We obviously know that this is not true!

This is the model answer:

“The 2023 IPCC report states that fossil fuels are not contributing to global warming due to the findings of the Sixth Assessment Report, which found a clear link between human activities and the observed increase in global temperatures.”

As you can see, the model answer is wrong and incoherent. You can see a few examples of this issue in the report above.

Running the whole scan#

We will now run the full scan, testing for all issue categories. Note: this can take up to 30 min, depending on the speed of OpenAI API.

Note that the scan results are not deterministic. In fact, LLMs may generally give different answers to the same or similar questions. Also, not all tests we perform are deterministic.

[ ]:
full_report = giskard.scan(giskard_model, giskard_dataset)

If you are running in a notebook, you can display the scan report directly in the notebook using display(...), otherwise you can export the report to an HTML file. Check the API Reference for more details on the export methods available on the ScanReport class.

[11]:
display(full_report)

# Save it to a file
full_report.to_html("scan_report.html")

Generate comprehensive test suites automatically for your model#

Generate test suites from the scan#

The objects produced by the scan can be used as fixtures to generate a test suite that integrates all detected vulnerabilities. Test suites allow you to evaluate and validate your model’s performance, ensuring that it behaves as expected on a set of predefined test cases, and to identify any regressions or issues that might arise during development or updates.

[ ]:
test_suite = full_report.generate_test_suite(name="Test suite generated by scan")
test_suite.run()

Debug and interact with your tests in the Giskard Hub#

At this point, you’ve created a test suite that covers a first layer of potential vulnerabilities for your LLM. From here, we encourage you to boost the coverage rate of your tests to anticipate as many failures as possible for your model. The base layer provided by the scan needs to be fine-tuned and augmented by human review, which is a great reason to head over to the Giskard Hub.

Play around with a demo of the Giskard Hub on HuggingFace Spaces using this link.

More than just fine-tuning tests, the Giskard Hub allows you to:

  • Compare models and prompts to decide which model or prompt to promote

  • Test out input prompts and evaluation criteria that make your model fail

  • Share your test results with team members and decision makers

The Giskard Hub can be deployed easily on HuggingFace Spaces. Other installation options are available in the documentation.

Here’s a sneak peek of the fine-tuning interface proposed by the Giskard Hub:

image0

Adding persistence to our Giskard Model#

To work with the Giskard Hub we need to be able to save and load the model, so that we can upload it and store. The giskard.Model class handles this automatically in most cases, but for more complex models you might need to do a bit of refactoring to get it working smoothly. This is especially the case if your model includes a custom index or other custom objects that are not easily serializable.

In our case, we are using the FAISS index to retrieve the documents, and we need to tell Giskard how to save and load it. Luckily, Giskard provides a simple but powerful way to customize the model wrapper by extending the giskard.Model class. To make sure that we can save to disk out model, we will need to implement save_model and load_model method to save and load both the RetrievalQA and the FAISS index:

[25]:
from pathlib import Path
from langchain.chains import load_chain


class FAISSRAGModel(giskard.Model):
    def model_predict(self, df: pd.DataFrame):
        # Same as our model_predict function above, but now using self.model,
        # which we pass upon initialization.
        return [self.model.run({"query": question}) for question in df["question"]]

    def save_model(self, path: str, *args, **kwargs):
        """Saves the model object to the given directory."""
        out_dest = Path(path)

        # Save the langchain RetrievalQA object
        self.model.save(out_dest.joinpath("model.json"))

        # Save the FAISS-based retriever
        db = self.model.retriever.vectorstore
        db.save_local(out_dest.joinpath("faiss"))

    @classmethod
    def load_model(cls, path: str, *args, **kwargs):
        """Loads the model object from the given directory."""
        src = Path(path)

        # Load the FAISS-based retriever
        db = FAISS.load_local(src.joinpath("faiss"), OpenAIEmbeddings())

        # Load the chain, passing the retriever
        chain = load_chain(src.joinpath("model.json"), retriever=db.as_retriever())
        return chain

Now we can wrap our model function as above, but using our custom model class:

[26]:
giskard_model = FAISSRAGModel(
    climate_qa_chain,
    model_type="text_generation",
    name="Climate Change Question Answering",
    description="This model answers any question about climate change based on IPCC reports",
    feature_names=["question"],
)

# Let’s set this as our test suite model
test_suite.default_params["model"] = giskard_model

Upload your test suite to the Giskard Hub#

The entry point to the Giskard Hub is the upload of your test suite. Uploading the test suite will automatically save the model & tests to the Giskard Hub.

[ ]:
from giskard import GiskardClient

# Create a Giskard client after having install the Giskard server (see documentation)
api_key = "<Giskard API key>"  # This can be found in the Settings tab of the Giskard Hub
hf_token = "<Your Giskard Space token>"  # If the Giskard Hub is installed on HF Space, this can be found on the Settings tab of the Giskard Hub

client = GiskardClient(
    url="http://localhost:19000",  # Option 1: Use URL of your local Giskard instance.
    # url="<URL of your Giskard hub Space>",  # Option 2: Use URL of your remote HuggingFace space.
    key=api_key,
    # hf_token=hf_token  # Use this token to access a private HF space.
)

my_project = client.create_project("my_project", "PROJECT_NAME", "DESCRIPTION")

# Upload to the project you just created
test_suite.upload(client, "my_project")