wehub-resource-sync
101 lines
2.8 KiB
Markdown
101 lines
2.8 KiB
Markdown
# Run your first experiment
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This tutorial walks you through running your first experiment with Ragas using the `@experiment` decorator and a local CSV backend.
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## Prerequisites
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- Python 3.9+
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- Ragas installed (see [Installation](./install.md))
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## Hello World 👋
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### 1. Install (if you haven’t already)
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```bash
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pip install ragas
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```
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### 2. Create `hello_world.py`
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Copy this into a new file and save as `hello_world.py`:
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```python
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import numpy as np
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from ragas import Dataset, experiment
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from ragas.metrics import MetricResult, discrete_metric
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# Define a custom metric for accuracy
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@discrete_metric(name="accuracy_score", allowed_values=["pass", "fail"])
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def accuracy_score(response: str, expected: str):
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result = "pass" if expected.lower().strip() == response.lower().strip() else "fail"
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return MetricResult(value=result, reason=f"Match: {result == 'pass'}")
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# Mock application endpoint that simulates an AI application response
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def mock_app_endpoint(**kwargs) -> str:
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return np.random.choice(["Paris", "4", "Blue Whale", "Einstein", "Python"])
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# Create an experiment that uses the mock application endpoint and the accuracy metric
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@experiment()
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async def run_experiment(row):
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response = mock_app_endpoint(query=row.get("query"))
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accuracy = accuracy_score.score(response=response, expected=row.get("expected_output"))
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return {**row, "response": response, "accuracy": accuracy.value}
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if __name__ == "__main__":
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import asyncio
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# Create dataset inline
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dataset = Dataset(name="test_dataset", backend="local/csv", root_dir=".")
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test_data = [
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{"query": "What is the capital of France?", "expected_output": "Paris"},
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{"query": "What is 2 + 2?", "expected_output": "4"},
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{"query": "What is the largest animal?", "expected_output": "Blue Whale"},
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{"query": "Who developed the theory of relativity?", "expected_output": "Einstein"},
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{"query": "What programming language is named after a snake?", "expected_output": "Python"},
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]
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for sample in test_data:
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dataset.append(sample)
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dataset.save()
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# Run experiment
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_ = asyncio.run(run_experiment.arun(dataset, name="first_experiment"))
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```
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### 3. Inspect the generated files
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```bash
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tree .
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```
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You should see:
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```
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├── datasets
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│ └── test_dataset.csv
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└── experiments
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└── first_experiment.csv
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```
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### 4. View the results of your first experiment
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```bash
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open experiments/first_experiment.csv
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```
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Output preview:
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## Next steps
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- Learn the concepts behind experiments in [Experiments (Concepts)](../concepts/experimentation.md)
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- Explore evaluation metrics in [Metrics](../concepts/metrics/index.md)
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