我尝试重构我的python代码以使用Pytorch-Lightning。但是我遇到了无法导入Pytorch-Lightning库的问题。我得到了以下错误：

ModuleNotFoundError                       Traceback (most recent call last)
Cell In[1], line 14
     12 from fastai.vision.all import * 
     13 from ipywidgets import IntProgress 
---> 14 import pytorch_lightning as pl

ModuleNotFoundError: No module named 'pytorch_lightning'

导入时看不到pytorch_lightning和lightning。
我只有一个python环境和内核（我在Visual Studio Code中使用Jupyter Notebook）。当我检查pip list时，我得到以下输出：

Package                  Version
------------------------ -------------
aiohttp                  3.8.4
aiosignal                1.3.1
anyio                    3.6.2
apturl                   0.5.2
arrow                    1.2.3
async-timeout            4.0.2
attrs                    22.2.0
Automat                  0.8.0
backcall                 0.1.0
bcrypt                   3.1.7
beautifulsoup4           4.12.0
bleach                   3.1.1
blessed                  1.20.0
blinker                  1.4
Brlapi                   0.7.0
certifi                  2022.12.7
chardet                  3.0.4
charset-normalizer       3.1.0
Click                    7.0
cloud-init               22.4.2
cmake                    3.26.1
colorama                 0.4.3
command-not-found        0.3
configobj                5.0.6
constantly               15.1.0
croniter                 1.3.8
cryptography             2.8
cupshelpers              1.0
dateutils                0.6.12
dbus-python              1.2.16
decorator                4.4.2
deepdiff                 6.3.0
defer                    1.0.6
defusedxml               0.6.0
distro                   1.4.0
distro-info              0.23ubuntu1
dnspython                2.3.0
duplicity                0.8.12.0
email-validator          1.3.1
entrypoints              0.3
fastapi                  0.88.0
fasteners                0.14.1
filelock                 3.11.0
frozenlist               1.3.3
fsspec                   2023.4.0
future                   0.18.2
h11                      0.14.0
html5lib                 1.0.1
httpcore                 0.16.3
httplib2                 0.14.0
httptools                0.5.0
httpx                    0.23.3
hyperlink                19.0.0
idna                     3.4
importlib-metadata       1.5.0
incremental              16.10.1
inquirer                 3.1.3
install                  1.3.5
ipykernel                5.2.0
ipython                  7.13.0
ipython_genutils         0.2.0
ipywidgets               6.0.0
itsdangerous             2.1.2
jedi                     0.15.2
Jinja2                   3.1.2
jsonpatch                1.22
jsonpointer              2.0
jsonschema               3.2.0
jupyter-client           6.1.2
jupyter-core             4.6.3
keyring                  18.0.1
language-selector        0.1
launchpadlib             1.10.13
lazr.restfulclient       0.14.2
lazr.uri                 1.0.3
lightning                2.1.0.dev0
lightning-cloud          0.5.32
lightning-utilities      0.8.0
lit                      16.0.0
lockfile                 0.12.2
louis                    3.12.0
macaroonbakery           1.3.1
Mako                     1.1.0
markdown-it-py           2.2.0
MarkupSafe               2.1.2
mdurl                    0.1.2
mistune                  0.8.4
monotonic                1.5
more-itertools           4.2.0
mpmath                   1.3.0
multidict                6.0.4
nbconvert                5.6.1
nbformat                 5.0.4
netifaces                0.10.4
networkx                 3.1
notebook                 6.0.3
numpy                    1.24.2
nvidia-cublas-cu11       11.10.3.66
nvidia-cuda-cupti-cu11   11.7.101
nvidia-cuda-nvrtc-cu11   11.7.99
nvidia-cuda-runtime-cu11 11.7.99
nvidia-cudnn-cu11        8.5.0.96
nvidia-cufft-cu11        10.9.0.58
nvidia-curand-cu11       10.2.10.91
nvidia-cusolver-cu11     11.4.0.1
nvidia-cusparse-cu11     11.7.4.91
nvidia-nccl-cu11         2.14.3
nvidia-nvtx-cu11         11.7.91
oauthlib                 3.1.0
olefile                  0.46
ordered-set              4.1.0
orjson                   3.8.9
packaging                23.0
pandocfilters            1.4.2
paramiko                 2.6.0
parso                    0.5.2
pexpect                  4.6.0
pickleshare              0.7.5
Pillow                   7.0.0
pip                      23.0.1
prometheus-client        0.7.1
prompt-toolkit           2.0.10
protobuf                 3.6.1
psutil                   5.9.4
pyasn1                   0.4.2
pyasn1-modules           0.2.1
pycairo                  1.16.2
pycups                   1.9.73
pydantic                 1.10.7
Pygments                 2.14.0
PyGObject                3.36.0
PyHamcrest               1.9.0
PyJWT                    1.7.1
pymacaroons              0.13.0
PyNaCl                   1.3.0
pyOpenSSL                19.0.0
pyprof2calltree          1.4.4
pyRFC3339                1.1
pyrsistent               0.15.5
pyserial                 3.4
python-apt               2.0.1
python-dateutil          2.8.2
python-debian            0.1.36ubuntu1
python-dotenv            1.0.0
python-editor            1.0.4
python-multipart         0.0.6
pytorch-lightning        2.0.1
pytz                     2019.3
pyxdg                    0.26
PyYAML                   6.0
pyzmq                    18.1.1
ranger-fm                1.9.3
readchar                 4.0.5
reportlab                3.5.34
requests                 2.28.2
requests-unixsocket      0.2.0
rfc3986                  1.5.0
rich                     13.3.3
screen-resolution-extra  0.0.0
SecretStorage            2.3.1
Send2Trash               1.5.0
service-identity         18.1.0
setuptools               67.6.1
simplejson               3.16.0
six                      1.14.0
sniffio                  1.3.0
sos                      4.4
soupsieve                2.4
ssh-import-id            5.10
starlette                0.22.0
starsessions             1.3.0
sympy                    1.11.1
systemd-python           234
terminado                0.8.2
testpath                 0.4.4
torch                    2.0.0
torchmetrics             0.11.4
tornado                  5.1.1
tqdm                     4.65.0
traitlets                5.9.0
triton                   2.0.0
Twisted                  18.9.0
typing_extensions        4.5.0
ubuntu-advantage-tools   8001
ubuntu-drivers-common    0.0.0
ufw                      0.36
ujson                    5.7.0
unattended-upgrades      0.1
urllib3                  1.26.15
usb-creator              0.3.7
uvicorn                  0.21.1
uvloop                   0.17.0
wadllib                  1.3.3
watchfiles               0.19.0
wcwidth                  0.1.8
webencodings             0.5.1
websocket-client         1.5.1
websockets               10.4
wheel                    0.40.0
widgetsnbextension       2.0.0
xkit                     0.0.0
yarl                     1.8.2
zipp                     1.0.0
zope.interface           4.7.1

正如你所看到的，安装了一个Pytorch-Lightning库，但是即使我卸载，重新安装最新版本，通过GitHub存储库再次安装，更新，什么都不起作用。什么似乎是一个问题？