问下这几个参数具体在GraphSage中的作用是啥

--feature_idx，稠密特征的编号，使用稠密特征必须；
--feature_dim，稠密特征维度，使用稠密特征必须；
-—label_idx，label在稠密特征中的编号，监督模型必须；
--label_dim，label在稠密特征中的维度，监督模型必须；

The issue names the GraphSAGE parameters --feature_idx, --feature_dim, --label_idx, and --label_dim. Start by locating where these arguments are defined and consumed in the GraphSAGE implementation, then explain their expected values and when each is required. Done means the parameter roles and supervised or dense-feature requirements are documented clearly.

Written by the indexing model from the issue text.