The Visualizer class in the hana_ml.visualizers.visualizer_base module is a base class for all visualizations, storing axes, size, title, and other drawing parameters, with options to use matplotlib or plotly for plotting.
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Here is a Python code template based on the provided documentation:

```python
import matplotlib.pyplot as plt
from hana_ml.visualizers.visualizer_base import Visualizer

# Create a Visualizer instance
visualizer = Visualizer(ax=None, size=None, cmap=None, enable_plotly=True, fig=None, no_fig=False)

# Set the Axes
ax = plt.gca()  # get current axes
visualizer.set_ax(ax)

# Set the colormap
cmap = plt.cm.Blues
visualizer.set_cmap(cmap)

# Set the size
size = (800, 600)  # width, height in pixels
visualizer.set_size(size)

# Access readonly properties
print(visualizer.ax)
print(visualizer.cmap)
print(visualizer.size)

# Reset the visualizer
visualizer.reset()
```

Please replace the placeholders with actual values as per your requirements.