unbalanced data set的用法和樣例：
例句
- Experiment results show that the method can effectively enhance the classification performance on imbalanced data sets.
實驗結果表明，該方法可以有效提高不平衡數據的分類性能。 - It appears to be vital to obtain the data of solvent-polymer systems accurately by establishing thermodynamic models.
預測聚合物溶液體系的氣液平衡數據是熱力學模型的一個重要內容。
