In one example, a bulk dispute challenge system may select disputes to challenge from a bulk set of dispute events based on a probability of success and a return on investment. The bulk dispute challenge system may receive a dispute success model that calculates a predicted probability of success for disputes generated by applying a machine learning model to a training data set featuring multiple attributes describing data characteristics of disputed events. The bulk dispute challenge system may apply the dispute success model to a dispute of a dispute set. The bulk dispute challenge system may calculate a predicted probability of success for a dispute challenge. The bulk dispute challenge system may perform a dispute decision for the dispute based in part on the predicted probability of success and a dispute return on investment. The bulk dispute challenge system may execute the dispute challenge to the dispute based on the dispute decision.
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