StrategyAtlas is a visual analytics system to enable understanding of complex models by identifying and interpreting different model strategies.

What is a model strategy?

model⋅strategy [ˈmɒdl ˈstratɪʤi]

noun

1. different treatments by a machine learning model of distinct groups in the input data.

As an example, consider a fraud detection model.

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How do we find data clusters?

Traditionally, we can find clusters in the data by applying a 2D projection technique (e.g., UMAP).

UMAP

DataMap

How do we find strategy clusters?

We propose using the same approach on feature importance values to find model strategies.

UMAP

StrategyMap

What does a cluster mean?

Clusters in the StrategyMap indicate model strategies. However, what does each of these clusters mean? Our proposed visual analytics system StrategyAtlas offers three methods to identify and interpret model strategies:

Gradient heat map

A gradient heat map enables seeing how the feature contribution values of a single feature are distributed in the projection space.

Density plot list

Interactive density plots enable the analysis of clusters in terms of multiple features at a glance.

Cluster view

The cluster view helps to understand strategy clusters by representing them as a decision tree (separating the cluster from the other data).