Comments (1)
你好,感谢提问。
首先,MESA的训练集不是train+valid,你可以仔细阅读论文中的算法2和算法3,其中D_t是train set,D_v是valid set。
- train set: 算法2(ensemble training)的第7、8行描述了选取基学习器训练集的过程,你可以看到采样的是D_t,用于训练数据的是D_t的子集D'_t,i.e., D_v的数据并没用用于训练任何预测模型。
- valid set: D_v在算法2(ensemble training)中只出现在4、5行,用于计算误差分布E_Dv和meta-state S_t,D_v在算法3(meta training)中只出现在line#6,用于计算reward(泛化性能的变化)。
你混淆了两个做法:“训练时使用train和valid” 和 “将train+valid作为训练集“
- “训练时使用train和valid”:验证集本来的作用就是用来在训练的时候选取模型的最优设置,所以正常情况下的模型训练也会用到valid set。
- 而你说的“将train+valid作为训练集“意味着不区分train+valid,直接把两者取并集作为train set扔给模型训练,这肯定是不对的。将valid set的内容放入训练集意味着用了训练集的一个子集选取超参数,这么做没有意义,并且如上所诉,也不是MESA的做法。
另:
- 在meta-sampler的训练中使用了valid set的信息(比如用于计算meta-state和reward)用于指导teacher model什么是”good action“,但并没有直接从valid set数据特征直接学习信息(meta-sampler的输入空间是固定的状态空间,不是原始特征空间)。
- 你可以将meta/teacher model的角色理解为调参的机器学习工程师,所以它们需要valid set的信息。在MESA论文的相关工作中有关meta learning的部分,你能找到更多元学习的工作,它们的teacher model也使用了valid set上的gradient,如[1][2]
[1] Mengye Ren, Wenyuan Zeng, Bin Yang, and Raquel Urtasun. Learning to reweight examples for robust deep learning. In International Conference on Machine Learning, pages 4334–4343, 2018.
[2] Jun Shu, Qi Xie, Lixuan Yi, Qian Zhao, Sanping Zhou, Zongben Xu, and Deyu Meng. Meta-weight-net: Learning an explicit mapping for sample weighting. In NeurIPS, 2019.
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Related Issues (9)
- Could you please release the paper? HOT 1
- 请求修改代码以适配torch新的版本
- error : mesa.predict_proba
- Not able to run the model HOT 5
- 在多分类任务下报错 HOT 2
- Issue running model HOT 3
- Add Contributor HOT 4
- 数据贴标签以及train_ir设置问题 HOT 3
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