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Which of the following statements is correct regarding running costs (inference costs) when training a model from scratch versus adopting an existing model?
①From-scratch models always make inference inexpensive.
②Existing models always have high inference costs.
③Inference cost depends on model size and deployment method, so you can't say in general which is higher.
④Because inference cost is determined by the same factors as training cost, it will always rise as training cost increases.
⑤Inference is free and does not need to be included in the cost calculation.