Incompatible version with Strawberry Fields

[ianhellstrom]

Describe the bug antlr4-python3-runtime is incompatible between Braket (and the default simulator) and Strawberry Fields, even though it is pinned because of it: https://github.com/aws/amazon-braket-default-simulator-python/blob/main/setup.py#L38

However, it is pegged to a different version in Blackbird, which is used internally by SF:

https://github.com/XanaduAI/blackbird/blob/master/requirements.txt#L1

Error discovered by using pip-compile on a simple requirements.in file with pip-compile -r requirements.in

amazon-braket-sdk
strawberryfields

Output:

Could not find a version that matches antlr4-python3-runtime==4.8,==4.9.2 (from quantum-blackbird==0.4.0->strawberryfields==0.23.0->-r req.in (line 2))
Tried: 4.4.0, 4.4.1, 4.5, 4.5.2, 4.5.2.1, 4.5.3, 4.6, 4.7, 4.7.1, 4.7.2, 4.8, 4.9, 4.9.1, 4.9.2, 4.9.3, 4.10, 4.11.0, 4.11.0, 4.11.1, 4.11.1
There are incompatible versions in the resolved dependencies:
  antlr4-python3-runtime==4.9.2 (from amazon-braket-default-simulator==1.9.0->amazon-braket-sdk==1.31.1->-r req.in (line 1))
  antlr4-python3-runtime==4.8 (from quantum-blackbird==0.4.0->strawberryfields==0.23.0->-r req.in (line 2))

[ianhellstrom]

The plugin requires the installation of SF: https://github.com/aws/amazon-braket-strawberryfields-plugin-python

This means that blindly installing these with pip can lead to subtle bugs due to differences:

ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
amazon-braket-default-simulator 1.9.0 requires antlr4-python3-runtime==4.9.2, but you have antlr4-python3-runtime 4.8 which is incompatible.

[krneta]

Hi @ianhellstrom ,

Thank you for logging this issue. We are working on dealing with this dependency conflict. Meanwhile, if you need to unblock yourself, I suggest you run: pip install amazon-braket-sdk followed by pip install amazon-braket-strawberryfields-plugin as two separate commands.

pip should be able to automatically downgrade antrl to 4.8, which should work for how we currently use it.

Let me know if this helps.

[ianhellstrom]

Perhaps a silly question, but why not simply use 4.8?

[ianhellstrom-tomtom]

It seems as if Blackbird 0.5 uses the same version, which is now also used inside 0.23 of SF. Bit scary that package versions are updated in SF post-release... This ticket can therefore be closed.