[Code Coverage] test_profiler

[LukeLIN-web]

rename group_by(events, keyfn): to _group_by(events, keyfn):
rename test_get_gpu_memory_from_gc():
fix print function.
add test_profiler

[codecov]

Codecov Report

Merging #6573 (9e206ac) into master (5a277a2) will increase coverage by 0.89%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master    #6573      +/-   ##
==========================================
+ Coverage   86.26%   87.15%   +0.89%     
==========================================
  Files         418      418              
  Lines       22787    22788       +1     
==========================================
+ Hits        19658    19862     +204     
+ Misses       3129     2926     -203     

Impacted Files	Coverage Δ
torch_geometric/profile/profiler.py	90.00% <93.33%> (+90.00%)	⬆️
torch_geometric/profile/utils.py	74.60% <0.00%> (+9.52%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[LukeLIN-web]

I thought that __str__ will be tested by print, but not, why?
Why __init__ self._model = model following is not tested?

[rusty1s]

This module is sadly a bit unfinished, so it's quite hard to add meaningful tests to it. I'm sorry :( Still, this looks good. Thank you very much!