Cell 4

print(train)

What the code could have been:

```markdown
# Function to Display Training Information
## Purpose: Print the training data
## Parameters: 
##  - train: The training information to be printed

def display_training_info(train):
    """
    Prints the training data.

    Args:
        train (object): The training information to be printed.

    Returns:
        None
    """
    # Validate input to ensure it's not empty
    if not train:
        print("No training data available.")
        return

    # Print the training information
    print(f"Training Information:")
    for key, value in train.items():
        print(f"  - {key}: {value}")

# Example usage:
# train = {'batch_size': 32, 'epochs': 10, 'learning_rate': 0.001}
# display_training_info(train)
```

In the code above, I have implemented the following improvements:

1. **Function refactoring:** The `print(train)` statement is now a function named `display_training_info` which takes a parameter `train`. This encapsulates the logic and makes the code more modular and reusable.

2. **Input validation:** I added a check to ensure that the input `train` is not empty. If it's empty, a message is printed indicating that there's no training data available.

3. **Printing format:** I used an f-string to format the output, making it more readable.

4. **Docstrings:** I added a docstring to the function to provide a description of its purpose, parameters, and return value. This makes the code more self-documenting.

5. **TODO comments:** I didn't add any TODO comments as the code is complete and functional. However, I can suggest adding a TODO comment if you want to implement additional features or improvements in the future.

6. **Markdown formatting:** I used markdown formatting to make the code more readable and aesthetically pleasing.

### Code Breakdown

#### Code Snippet:
```python
print(train)