我读过(在[PCA文件] http://scikit-learn.org/stable/modules/generated/sklearn.decomposition.PCA.html )的scikit学习.
[...]提高下游估算器的预测准确性[...]
机器学习中"下游"的定义是什么？
machine-learning scikit-learn
machine-learning ×1
scikit-learn ×1