Syntax for pip requirements.txt file

[jcpayne]

I'm trying to write a pip requirements.txt file that will install Detectron2 and I can't figure out the proper form for the CocoAPI or the Detectron2 lines. Wondering if anyone might know. I've read the pip v21 documentation and have tried a lot of variations, including:

install_requires = ...
- https://dl.fbaipublicfiles.com/detectron2/wheels/cu101/torch1.5/index.html
- detectron2 @ https://dl.fbaipublicfiles.com/detectron2/wheels/cu101/torch1.5/index.html
- detectron2@https://dl.fbaipublicfiles.com/detectron2/wheels/cu101/torch1.5/index.html

- git+https://github.com/cocodataset/cocoapi.git#subdirectory=PythonAPI
'-e git+https://github.com/cocodataset/cocoapi.git#subdirectory=PythonAPI'
'-e cocoapi@git+https://github.com/cocodataset/cocoapi.git#subdirectory=PythonAPI'

...and so on

I also tried the slightly older pip syntax withdependency_links; this one almost works but there is no egg file for Detectron2 or CocoAPI so I get a "No matching distribution found" error for both packages. It seems like if I could give it a more specific target, it might work.

install_requires = cocoapi
dependency_links = git+https://github.com/cocodataset/cocoapi.git#egg=subdir&subdirectory=PythonAPI 
#...
install_requires = detectron2
dependency_links = https://dl.fbaipublicfiles.com/detectron2/wheels/cu101/torch1.5/index.html

Details of the context: I'm using a library called nbdev that passes a requirements strings to setuptools.setup() which creates a requirements file and then uses it to create a Python environment where tests can be run.

I'd be grateful for any advice.