Pysyft: Error when installing via `pip install syft`

[Wilann]

Description

When installing using pip install syft, I'm getting the error:

$ pip install syft
Collecting syft
  Using cached syft-0.3.0-py2.py3-none-any.whl (289 kB)
  Using cached syft-0.2.9-py3-none-any.whl (433 kB)
  Using cached syft-0.2.8-py3-none-any.whl (415 kB)
  Using cached syft-0.2.7-py3-none-any.whl (394 kB)
  Using cached syft-0.2.6-py3-none-any.whl (377 kB)
  Using cached syft-0.2.5-py3-none-any.whl (369 kB)
  Using cached syft-0.2.4-py3-none-any.whl (341 kB)
  Using cached syft-0.2.3-py3-none-any.whl (331 kB)
ERROR: Cannot install syft==0.2.3, syft==0.2.4, syft==0.2.5, syft==0.2.6, syft==0.2.7, syft==0.2.8, syft==0.2.9 and syft==0.3.0 because these package versions have conflicting dependencies.

The conflict is caused by:
    syft 0.3.0 depends on torch>=1.5
    syft 0.2.9 depends on torch~=1.4.0
    syft 0.2.8 depends on torch~=1.4.0
    syft 0.2.7 depends on torch~=1.4.0
    syft 0.2.6 depends on torchvision~=0.5.0
    syft 0.2.5 depends on torchvision~=0.5.0
    syft 0.2.4 depends on torchvision~=0.5.0
    syft 0.2.3 depends on torchvision~=0.5.0

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/user_guide/#fixing-conflicting-dependencies

How to Reproduce

Type pip install syft

System Information

• OS: MacOS
• OS Version: 11.0.1
• Language Version: Python 3.9.0
• Package Manager Version: Conda 4.9.2

[jaintj95]

Facing the exact same issue on Windows 10.

@Wilann As a temporary resolution, you can try these steps.
1) pip install syft==0.3.0
2) If 1 fails, install pytorch
3) Try 1 again

[Wilann]

@jaintj95 Worked perfectly - thanks a lot!

[madhavajay]

Unfortunately, PyTorch does not support Python 3.9 yet so we are unable to support it either.
I would suggest using a tool like pyenv so you can install multiple versions of Python 3 on MacOS now that brew is upgrading the current python 3 to 3.9.0.

[jaintj95]

@madhavajay I had the same issue with Python 3.8.x

[madhavajay]

Hi @jaintj95, Do you have an existing installation of torch? Are you able to show some steps to re-produce your 3.8.x error?

[Harkirat155]

The issue arises due to conflicting dependencies of different versions for syft.
As, @madhavajay suggested, you should consider using virtualenvs if you seek to work with multiple versions. Or consider uninstalling previous versions, if you currently don't have dependendents off them.
On a side note, we recent brought major changes in recent releases for pysyft(v0.3.x), and it is recommended to switch to current versions to recieve all the cool new changes. 🚀

[jaintj95]

Torch 1.4.0 is installed in Conda base package but I created a separated conda environment for syft.

Steps:

$ conda create -n pysyft python=3.8
$ conda activate pysyft
$ conda install jupyter notebook
$ pip install syft

[madhavajay]

@jaintj95 We can add some Conda tests to our CI to see whats happening and make sure this isnt an issue.