问题如下：
which of the following statements about Random forests is incorrect?
选项：
A. Random forests is a technique that uses multiple trees
B. One defect of random forests is that they
are a bit of a black box—they don’t offer simple summaries of
relationships in the data.
C. random forests can determine which
variables are “important” in predictions in the sense of contributing the biggest
improvements in prediction accuracy.
D. The most common solution to this problem is to “prune” the tree by imposing a cost for complexity.
解释：
D is correct.
选项D与Random foreset无关，选项D描述的是Pruning Trees
选项c对吗？Random trees可以用于variable selectuon吗？
