I am looking for as gentle of possible of an introduction to Kontsevich-Soibelman's theory of motivic DT-invariants. Specifically I am interested in the algebraic aspects of the theory and the relation with cluster categories. Obviously there is Kontsevich and Soibelman's 150 page paper on the subject, but words like etale and stack tend to make me panic. I am much more comfortable with 3-Calabi-Yau categories than 3 dimensional Calabi-Yau varieties.
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