classify-sklearn Pre-fitted sklearn-based taxonomy classifier
extract-reads Extract reads from reference sequences.
fit-classifier-naive-bayes Train the naive_bayes classifier
fit-classifier-sklearn Train an almost arbitrary scikit-learn classifier

这些功能主要分为三类：
1.基于机器学习的machine-learning
2.基于对齐的alignment-based
从代码看qiime的对齐方案用了blast+lca 和我们的病原的方案一样
blast后面看看怎么优化
3.构建相关的数据库