Here are an example of shap values plot from here. How to interpret the 'bubble' or 'spikes' on this shap values plot I highlighted in yellow color?
Topic plotting machine-learning-model feature-selection machine-learning
Category Data Science
That's to help indicate the volume of points in that region, which would be lost due to overlap if all plotted along the horizontal line. This kind of plot is referred to as a "bee-swarm", and is somewhat similar to violin plots, strip plots, or scatter plots with jitter.
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