Pylance breaks with specific packages

[parasurama]

Issue Type: Bug

Pylance breaks after loading certain packages (for example sentence_transformers https://github.com/UKPLab/sentence-transformers)

from sentence_transformers import SentenceTransformer, util

Syntax highlighting, error highlighting, autocomplete stops working/becomes very slow if I have the above import line in my file

Extension version: 2021.7.2
VS Code version: Code 1.58.1 (Universal) (2aeda6b18e13c4f4f9edf6667158a6b8d408874b, 2021-07-13T06:22:33.013Z)
OS version: Darwin arm64 20.3.0
Restricted Mode: No
Remote OS version: Linux x64 5.3.0-1017-aws

System Info

Item	Value
CPUs	Apple M1 (8 x 24)
GPU Status	2d_canvas: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	2, 2, 2
Memory (System)	8.00GB (0.12GB free)
Process Argv	--crash-reporter-id ff063a8f-916a-4966-bb68-317ca9914445
Screen Reader	no
VM	0%

Item	Value
Remote	SSH: revel
OS	Linux x64 5.3.0-1017-aws
CPUs	Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz (32 x 3103)
Memory (System)	123.06GB (9.21GB free)
VM	0%

A/B Experiments

vsliv368:30146709
vsreu685:30147344
python383cf:30185419
pythonvspyt602:30300191
vspor879:30202332
vspor708:30202333
vspor363:30204092
pythonvspyt639:30300192
pythontb:30283811
pythonvspyt551:30311712
vspre833:30321513
pythonptprofiler:30281270
vsdfh931:30280409
vshan820:30294714
vstes263:30335439
pythondataviewer:30285071
vscus158:30321503
pythonvsuse255:30335481
vscod805cf:30301675
pythonvspyt200cf:30331938
vscextlangct:30333562
binariesv615:30325510
bridge0708:30335490

[jakebailey]

This library is an extension of transformers, which is tracked in #1258.