我想用监督模型，但是参数label_idx，label_dim为什么是跟稠密特征绑定在一起
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Description
难道是预测稠密特征的label吗？
感谢解答！
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Research direction
The issue names the supervised model parameters label_idx and label_dim but no files, tests, or entry points. Start by locating their definitions and existing supervised-model documentation, then clarify how they relate to dense features. Done means documenting the intended relationship and parameter usage.
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Assessment
- Tech stack
- cpp
- Domain
- machine-learning
- Issue type
- Documentation
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 15/100