Update 2 tutorial files

docs/book/user-guide/starter-guide-2/introduction.md

@@ -73,3 +73,39 @@ if __name__ == "__main__":
 Copy this code into a new file and name it `run.py`. Then run it with your command line:
 
 
+```python
+from zenml import pipeline, step
+
+@step
+def load_data() -> dict:
+    """Simulates loading of training data and labels."""
+
+    training_data = [[1, 2], [3, 4], [5, 6]]
+    labels = [0, 1, 0]
+
+    return {'features': training_data, 'labels': labels}
+
+@step
+def train_model(data: dict) -> None:
+    """
+    A mock 'training' process that also demonstrates using the input data.
+    In a real-world scenario, this would be replaced with actual model fitting logic.
+    """
+    total_features = sum(map(sum, data['features']))
+    total_labels = sum(data['labels'])
+
+    print(f"Trained model using {len(data['features'])} data points. "
+          f"Feature sum is {total_features}, label sum is {total_labels}")
+
+@pipeline
+def simple_ml_pipeline():
+    """Define a pipeline that connects the steps."""
+    dataset = load_data()
+    train_model(dataset)
+
+if __name__ == "__main__":
+    run = simple_ml_pipeline()
+    # You can now use the `run` object to see steps, outputs, etc.
+```
+
+