# ❌ No
class OfflineTrainer(Trainer):
    def some_common_method(self): ...

class DPOTrainer(OfflineTrainer): ...

class KTOTrainer(OfflineTrainer): ...

# ✅ Better
class DPOTrainer(Trainer):
    def some_common_method(self): ...

class KTOTrainer(Trainer):
    def some_common_method(self): ...