Implementation of linearized_directed constructor

[d-schindler]

This PR is to provide linearized MS for directed networks as discussed in #69

[d-schindler]

We need to set $\alpha=1$ (no teleportation) as a default for large graphs because otherwise the quality functions is a dense matrix, which leads to memory errors.

[d-schindler]

We should have constructors_kwargs as an argument in run() such that one can change teleportation conveniently.

[d-schindler]

I think we need to improve the code for constructors by using more scipy.sparse commands.

[d-schindler]

@arnaudon , I think this is ready to merge after your improvements. could you e.g. provide a kwarg in run to set the teleportation parameter alpha?

[codecov-commenter]

Codecov Report

Merging #70 (3554cfe) into master (33890b7) will not change coverage.
The diff coverage is 100.00%.

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@@            Coverage Diff            @@
##            master       #70   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            7         7           
  Lines          552       576   +24     
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+ Hits           552       576   +24     

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Impacted Files	Coverage Δ
src/pygenstability/constructors.py	100.00% <100.00%> (ø)
src/pygenstability/pygenstability.py	100.00% <100.00%> (ø)

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[arnaudon]

Here you are!

[arnaudon]

Let me know if it's ok, and we can merge!

[d-schindler]

Do you keep the print statements on purpose? Also the print("alpha1")?

[arnaudon]

Oups, I just removed them!

[arnaudon]

is it good to merge like that @d-schindler ?

[d-schindler]

Yes, I think it's fine now!

[d-schindler]

Before you merge, could you delete this from benchmarking.py, it's deprecated: with_spectral_decomp=True