git一般有很多分支，我们clone到本地的时候一般都是master分支，那么如何切换到其他分支呢？
1. 查看远程分支
$ git branch -a
我在mxnet根目录下运行以上命令：
~/mxnet$ git branch -a
* master
remotes/origin/HEAD -> origin/master
remotes/origin/master
remotes/origin/nnvm
remotes/origin/piiswrong-patch-1
remotes/origin/v0.9rc1
2. 查看本地分支
~/mxnet$ git branch
* master
3. 切换分支
$ git checkout -b v0.9rc1 origin/v0.9rc1
Branch v0.9rc1 set up to track remote branch v0.9rc1 from origin.
Switched to a new branch 'v0.9rc1'
＃已经切换到v0.9rc1分支了
$ git branch
master
* v0.9rc1
＃切换回master分支
$ git checkout master
Switched to branch 'master'
Your branch is up-to-date with 'origin/master'.