我已经在jupyter笔记本终端上安装了ipyparallel，但是当我无法运行ipcluster时
我可以尝试更新pip ipyparallel等，但是我仍然无法运行：
[s6107840@labcom ~]$ pip install --upgrade ipyparallel
Requirement already up-to-date: ipyparallel in ./.local/lib/python3.6/site-packages (6.2.4)
Requirement already satisfied, skipping upgrade: traitlets>=4.3 in /opt/anaconda3/lib/python3.6/site-packages (from ipyparallel) (4.3.2)
Requirement already satisfied, skipping upgrade: jupyter-client in /opt/anaconda3/lib/python3.6/site-packages (from ipyparallel) (5.1.0)
Requirement already satisfied, skipping upgrade: pyzmq>=13 in /opt/anaconda3/lib/python3.6/site-packages (from ipyparallel) (16.0.2)
Requirement already satisfied, skipping upgrade: decorator in /opt/anaconda3/lib/python3.6/site-packages (from ipyparallel) (4.1.2)
Requirement already satisfied, skipping upgrade: ipython-genutils in /opt/anaconda3/lib/python3.6/site-packages (from ipyparallel) (0.2.0)
Requirement already satisfied, skipping upgrade: python-dateutil>=2.1 in /opt/anaconda3/lib/python3.6/site-packages (from ipyparallel) (2.
6.1)
Requirement already satisfied, skipping upgrade: ipykernel>=4.4 in /opt/anaconda3/lib/python3.6/site-packages (from ipyparallel) (4.6.1)
Requirement already satisfied, skipping upgrade: ipython>=4 in /opt/anaconda3/lib/python3.6/site-packages (from ipyparallel) (6.1.0)
Requirement already satisfied, skipping upgrade: tornado>=4 in /opt/anaconda3/lib/python3.6/site-packages (from ipyparallel) (4.5.2)
Requirement already satisfied, skipping upgrade: six in /opt/anaconda3/lib/python3.6/site-packages (from traitlets>=4.3->ipyparallel) (1.1
1.0)
Requirement already satisfied, skipping upgrade: jupyter_core in /opt/anaconda3/lib/python3.6/site-packages (from jupyter-client->ipyparal
lel) (4.3.0)
Requirement already satisfied, skipping upgrade: setuptools>=18.5 in /opt/anaconda3/lib/python3.6/site-packages (from ipython>=4->ipyparal
lel) (39.2.0)
Requirement already satisfied, skipping upgrade: jedi>=0.10 in /opt/anaconda3/lib/python3.6/site-packages (from ipython>=4->ipyparallel) (
0.10.2)
Requirement already satisfied, skipping upgrade: pickleshare in /opt/anaconda3/lib/python3.6/site-packages (from ipython>=4->ipyparallel)
(0.7.4)
Requirement already satisfied, skipping upgrade: simplegeneric>0.8 in /opt/anaconda3/lib/python3.6/site-packages (from ipython>=4->ipypara
llel) (0.8.1)
Requirement already satisfied, skipping upgrade: prompt_toolkit<2.0.0,>=1.0.4 in /opt/anaconda3/lib/python3.6/site-packages (from ipython>
=4->ipyparallel) (1.0.15)
Requirement already satisfied, skipping upgrade: pygments in /opt/anaconda3/lib/python3.6/site-packages (from ipython>=4->ipyparallel) (2.
2.0)
Requirement already satisfied, skipping upgrade: pexpect in /opt/anaconda3/lib/python3.6/site-packages (from ipython>=4->ipyparallel) (4.2
.1)
Requirement already satisfied, skipping upgrade: wcwidth in /opt/anaconda3/lib/python3.6/site-packages (from prompt_toolkit<2.0.0,>=1.0.4-
>ipython>=4->ipyparallel) (0.1.7)
[s6107840@labcom ~]$ ipcluster
bash: ipcluster: command not found
bash: ipcluster: command not found