how to add dependencies from other sources instead of pypi?

[JimmyJIA-02]

hi there,
I 'm trying to download paddlepaddle-gpu 2.5.1.post102.
On the pypi page, it says the website provides 2.5.1post102, which is what I want, but when I added this in to pipfile:

[packages]
...
paddlepaddle-gpu = "==2.5.1.post102"

when I pipenv install, error occurred like:

...
pipenv.exceptions.ResolutionFailure: [31m[1mERROR[0m: [33mNo matching distribution found for 
paddlepaddle-gpu==2.5.1.post102[0m
✘ Locking Failed!
...

(too much here, but all indicating can not find such distribution)

BTW, using 2.5.1 instead of adding 2.5.1.post102 in pipfile is okay when locking, but can't be used in my code.
I wanna know why this happen, and, if I want to use pipfile, how can I make it correctly download this package?

[JimmyJIA-02]

solved.