Fix EAD target attack

[rikonaka]

PR Type and Checklist

What kind of change does this PR introduce?

• [x] FIX BUG
  • [x] Fix EAD targeted attack bug, this bug is because I wrote the wrong way to update y_k after backwards (this bug made me go through the original paper and the github code of the paper all day 🤯 ). Both untargeted attack and targeted attack acc drop to 0% in 16 CIFAR10 test images.

[codecov-commenter]

Codecov Report

Merging #140 (aa14f63) into master (e50ba8d) will increase coverage by 0.36%. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
+ Coverage   72.27%   72.63%   +0.36%     
==========================================
  Files          42       42              
  Lines        3747     3691      -56     
  Branches      541      522      -19     
==========================================
- Hits         2708     2681      -27     
+ Misses        876      856      -20     
+ Partials      163      154       -9     

Impacted Files	Coverage Δ
torchattacks/attacks/eaden.py	97.60% <100.00%> (+0.58%)	:arrow_up:
torchattacks/attacks/eadl1.py	97.60% <100.00%> (+2.01%)	:arrow_up:
torchattacks/attacks/spsa.py	91.95% <100.00%> (+17.97%)	:arrow_up:

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[Harry24k]

Thanks a lot! Now EAD works well 😃

[rikonaka]

Thanks a lot! Now EAD works well 😃

천만에요 😜