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Align KTO with DPO: Remove duplicate import of PreTrainedModel

Align KTO with DPO: Remove duplicate import of PreTrainedModel: a task in trl-r2e-v0-1 (Harbor dataset). Title: Align KTO with DPO: Remove duplicate import of PreTrainedModel

The task

**Title:** Align KTO with DPO: Remove duplicate import of PreTrainedModel

Part of AdithyaSK/trl-r2e-v0-1.