Compatibility fixes to prior versions

[GlaserN]

Changes include:

• corrected behavior of flux tuning device
• streamline noise devices
• quantity object can be used as an argument for numpy functions, returning a np.array
• update the model if model parameters were changed
• more continous reordering of dressed states
• ...

This pull request also greatly improves perfomance,

• by using vectorized performance
• providing a response function utilising fft instead of manual multiplication
• using tf.constants instead of tf.variables, where it is not explicitly necessary

[lazyoracle]

Hi @GlaserN, please check out the CONTRIBUTING.md, on how to set up the pre-commit hooks. That should auto format and lint your commits and will pass the Code Formatting and Linting check that's currently failing.

[codecov-io]

Codecov Report

Merging #34 (f50fcda) into dev (50052a5) will decrease coverage by 0.09%.
The diff coverage is 67.57%.

@@            Coverage Diff             @@
##              dev      #34      +/-   ##
==========================================
- Coverage   46.92%   46.82%   -0.10%     
==========================================
  Files          35       35              
  Lines        4492     4574      +82     
==========================================
+ Hits         2108     2142      +34     
- Misses       2384     2432      +48     

Impacted Files	Coverage Δ
c3/libraries/envelopes.py	36.87% <0.00%> (ø)
c3/optimizers/sensitivity.py	0.00% <ø> (ø)
c3/system/tasks.py	45.28% <0.00%> (ø)
c3/libraries/fidelities.py	18.29% <11.11%> (ø)
c3/utils/utils.py	65.47% <45.45%> (-2.10%)	⬇️
c3/utils/tf_utils.py	42.57% <51.35%> (-1.87%)	⬇️
c3/optimizers/optimizer.py	74.43% <53.84%> (-1.76%)	⬇️
c3/generator/devices.py	68.44% <71.42%> (-3.26%)	⬇️
c3/system/model.py	79.71% <75.00%> (ø)
c3/c3objs.py	79.13% <82.75%> (-0.44%)	⬇️
... and 8 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 50052a5...f50fcda. Read the comment docs.

[lazyoracle]

Does this address #28 ?

[GlaserN]

Does this address #28 ?
No it does not. I guess a change there would need a proper discussion.

[fedroy]

@lazyoracle after merging dev into the PR it fails the build (which was previously successful) and it seems to be some qiskit import. Could you give it a look?

[lazyoracle]

Fixed in #48 and merged to dev. Let me know if it still persists once you merge dev into further_fixes.

[lgtm-com]

This pull request introduces 1 alert when merging 1b6e1c2 into a4ab975 - view on LGTM.com

new alerts:

• 1 for Unused exception object

[lgtm-com]

This pull request introduces 1 alert when merging 6e679ad into a4ab975 - view on LGTM.com

new alerts:

• 1 for Unused exception object