Fix/relation extractor evaluation

[GabrielePicco]

Status	Type	⚠️ Core Change	Issue
Ready	Bug	No

Problem

• Possible overflow error and relation evaluation issue
• FewRel was not returning a Dataset object

Solution

• Fixed possible overflow error and relation evaluation
• Refactor the RE pipeline

[codecov]

Codecov Report

Base: 92.18% // Head: 92.20% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (c078a98) compared to base (2a84de0).
Patch coverage: 91.66% of modified lines in pull request are covered.

❗ Current head c078a98 differs from pull request most recent head 9742e6e. Consider uploading reports for the commit 9742e6e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
+ Coverage   92.18%   92.20%   +0.02%     
==========================================
  Files          67       67              
  Lines        2763     2758       -5     
==========================================
- Hits         2547     2543       -4     
+ Misses        216      215       -1     

Impacted Files	Coverage Δ
...hot/relation_extractor/zsrc/zero_shot_rel_class.py	78.89% <0.00%> (-0.74%)	⬇️
zshot/evaluation/dataset/fewrel/fewrel.py	96.96% <100.00%> (+4.11%)	⬆️
...ot/evaluation/dataset/med_mentions/med_mentions.py	100.00% <100.00%> (ø)
zshot/evaluation/pipeline.py	100.00% <100.00%> (ø)
zshot/linker/linker_smxm.py	96.77% <100.00%> (+0.10%)	⬆️
...shot/mentions_extractor/mentions_extractor_smxm.py	100.00% <100.00%> (ø)
zshot/tests/evaluation/test_datasets.py	100.00% <100.00%> (ø)
zshot/tests/evaluation/test_evaluation.py	99.46% <100.00%> (+<0.01%)	⬆️

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