Fix broken anomaly visualizer

[lorenzomammana]

Summary

The latest changes to the normalization of anomaly score are causing a bug in the visualization of the heatmap made by the visualizer callback, to solve the issue the anomaly maps are properly rescaled in [0-1] range to properly impose them over the image.

Type of Change

• Bug fix (non-breaking change that solves an issue)

Checklist

Please confirm that the following tasks have been completed:

• I have tested my changes locally and they work as expected. (Please describe the tests you performed.)
• I have added unit tests for my changes, or updated existing tests if necessary.
• I have updated the documentation, if applicable.
• I have installed pre-commit and run locally for my code changes.

Screenshots or Visuals

Before the fix

After the fix