TalkMatrix: Generating Character Dialogue that is Both Consistent and Diverse

TalkMatrix is a method for generating character dialogue that balances consistency and diversity across multiple prompts. It produces several candidate lines for each character-situation pair and then jointly selects a complete matrix of lines by optimizing embedding-based consistency and diversity objectives. The approach uses a two‑level minimax formulation and multi‑start coordinate ascent to approximate the discrete optimization, outperforming random, independent, and other baseline selection strategies in experiments on synthetic and board‑game role‑playing scenarios.

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