优化：如果某轮没有发生交换，说明已有序，提前结束
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Standard forward pass. The model's forward() method must be a standard tensor-in, logits-out computation. No problem-specific control flow (for-loops over digits, explicit carry variables, string manipulation) inside forward(). The autoregressive generation loop lives outside the model, exactly as it would for any language model.
Раскрыты подробности похищения ребенка в Смоленске09:27