After following exception message to install modin[ray], only pandas is downgraded..

When i have the following installed:

modin: 0.15.3
pandas: 1.4.4
ray: 3.0.0.dev0

I get this error:

Exception has occurred: ImportError
Please `pip install modin[ray]` to install compatible Ray version (>=1.4.0,<1.13.0).

after installing modin[ray], the only library change is a downgrade of pandas to 1.4.2:

modin: 0.15.0
pandas: 1.4.2
ray: 3.0.0.dev0

Is this expected? Why would the exception complain about a compatible version, but leave the same version of ray installed and only downgrade pandas? I am on the WINDOWS 10 OS.

[YarShev]

Once we get #5037 in.

cc @vnlitvinov

[vnlitvinov]

We indeed limit Ray versions as you’ve stated above. As for why pip install modin[ray] is not downgrading Ray I’m not sure, it might be a bug in pip itself as our setup.py clearly lists the requirement: https://github.com/modin-project/modin/blob/0.15.3/setup.py#L14

That said, we should be making 0.16 really soon which will be lifting Ray limitations.

Meanwhile you can run pip install ray[default]==1.12.1 to force correct Ray version in your environment.