Exposed parameter maximum_number_of_iterations

[LucaCappelletti94]

On some inputs, methods based on ARPACK may fail because of missed convergence. The default value on scipy is a bit too strict (maxiter = 10*number_of_nodes), so I have exposed the parameter and set it as default to (maxiter = 100*number_of_nodes).

So far, I have encountered convergence issues only in this model, as computing the smallest eigenvectors can be more complicated than the largest ones. If I encounter this issue in other models, I will also make a pull request.

[codecov-commenter]

Codecov Report

Merging #106 (678e9fd) into master (1165e48) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #106   +/-   ##
=======================================
  Coverage   97.30%   97.30%           
=======================================
  Files          61       61           
  Lines        2595     2596    +1     
=======================================
+ Hits         2525     2526    +1     
  Misses         70       70           

Impacted Files	Coverage Δ
...node_embedding/neighbourhood/laplacianeigenmaps.py	100.00% <100.00%> (ø)

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