vscode-python: Intellisense tooltip not show

Environment data

VS Code version: 1.20.1 Python Extension version: 2018.1.0 Python Version: 2.7.5 OS and version: CentOS 7.4.1708 caffe2 (with GPU enabled) commit: 5651c4ce0279c895cbb1d1eeecc6594cc8791103

Actual behavior

Intellisense tooltip is not shown.

Expected behavior

Intellisense tooltip is shown.

Steps to reproduce:

• git clone https://github.com/facebookresearch/Detectron.git
• cd Detectron/tools
• code infer_simple.py
• Scroll to the 144-th line.
• Move mouse cursor over the text GlobalInit, and you will see a tooltip (Intellisense) shows Loading…
• Move mouse cursor to other texts and you will find Intellisense tooltip doesn’t show anymore.

Logs

Output from Console window (Help->Developer Tools menu)

[Extension Host] Python Extension: sendCommand jediProxy, Error (sendCommand) This socket has been ended by the other party null
t.log @ /usr/share/code/resources/app/out/vs/workbench/workbench.main.js:253
t._logExtensionHostMessage @ /usr/share/code/resources/app/out/vs/workbench/workbench.main.js:2713
(anonymous) @ /usr/share/code/resources/app/out/vs/workbench/workbench.main.js:2709
emitTwo @ events.js:106
emit @ events.js:194
process.nextTick @ internal/child_process.js:766
_combinedTickCallback @ internal/process/next_tick.js:73
_tickCallback @ internal/process/next_tick.js:104
/usr/share/code/resources/app/out/vs/workbench/workbench.main.js:253
[Extension Host] Error: This socket has been ended by the other party
	at Socket.writeAfterFIN [as write] (net.js:305:12)
	at JediProxy.<anonymous> (/home2/grad97/myh/.vscode/extensions/ms-python.python-2018.1.0/out/client/providers/jediProxy.js:175:33)
	at Generator.next (<anonymous>)
	at fulfilled (/home2/grad97/myh/.vscode/extensions/ms-python.python-2018.1.0/out/client/providers/jediProxy.js:12:58)
	at <anonymous>
t.log @ /usr/share/code/resources/app/out/vs/workbench/workbench.main.js:253
t._logExtensionHostMessage @ /usr/share/code/resources/app/out/vs/workbench/workbench.main.js:2713
(anonymous) @ /usr/share/code/resources/app/out/vs/workbench/workbench.main.js:2709
emitTwo @ events.js:106
emit @ events.js:194
process.nextTick @ internal/child_process.js:766
_combinedTickCallback @ internal/process/next_tick.js:73
_tickCallback @ internal/process/next_tick.js:104
/usr/share/code/resources/app/out/vs/workbench/workbench.main.js:253