add tests for summary networks [WIP]

[rusty-electron]

I will be adding more commits to this PR as per instructions from @LarsKue.

Updates to test fixtures:

• tests/conftest.py: Modified the summary_network fixture to accept the summary_dim parameter.
• tests/test_networks/conftest.py: Added new fixtures for summary_dim, key_dim, and various network instances (lst_net, set_transformer, set_transformer_key_dim_variation, deep_set).

New test cases:

• tests/test_networks/test_summary_networks.py: Introduced new test cases test_compute_metrics and test_set_transformer_with_key_dim to verify the functionality of the new attributes and ensure the correctness of the network outputs.

[LarsKue]

Thank you for the PR. Please make sure that the linter passes before merging.

[paul-buerkner]

In an attempt to merge this PR, I noticed that there are some unknown arguments used in set_transformer, namely key_dim and num_attention_blocks.

@LarsKue I think you will need to check and fix this before you can merge it as I don't understand the context in which these changes were made.

[LarsKue]

@paul-buerkner please never merge PRs that do not at the very least pass all tests, unless you have very good reason to. I will look into this as soon as I have a time slot available.

[paul-buerkner]

I did not intend to merge this PR without consultation (even if all tests would have passed, which they are not because of the issue I brought up). I just wanted to move it forward. My earlier message was unclear in this regard. Sorry for that.

[paul-buerkner]

In an attempt to move this PR forward, I realized that it's probably safer to make a new PR extending tests for summary networks, rather to rely on this one. It currently has too many loose ends that I am not quite able to fit together.

[paul-buerkner]

I think I figured out what were the issues and was able to get all the tests running again. Changes to the code base outside of the tests are minimal. They only concern the consistent storing of summary_dim in all networks intended for summarizing. Previously this was only done for some summary networks but not for others which didn't make sense.

I will merge as soon as all checks are passing.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...esflow/networks/transformers/fusion_transformer.py	0.00%	1 Missing ⚠️
...w/networks/transformers/time_series_transformer.py	0.00%	1 Missing ⚠️

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Files with missing lines	Coverage Δ
bayesflow/networks/transformers/set_transformer.py	93.75% <100.00%> (+0.20%)	⬆️
...esflow/networks/transformers/fusion_transformer.py	34.37% <0.00%> (-1.11%)	⬇️
...w/networks/transformers/time_series_transformer.py	25.58% <0.00%> (-0.61%)	⬇️

... and 1 file with indirect coverage changes