[Fix] expired scipy deprecations, sp.sqrt

[Moritz-Alexander-Kern]

This pull request (PR) replaces the usage of the sp.sqrt function with np.sqrt.

The deprecation of sp.sqrt expired earlier than expected. Originally, it was planned to be removed with the release of scipy 2.0.0, but with scipy version greater than 1.10.1, unit tests are failing.

Deprecation was introduced in scipy 1.4.0:

https://docs.scipy.org/doc/scipy/release/1.4.0-notes.html#scipy-deprecations

Quote from the scipy release notes:

Support for NumPy functions exposed via the root SciPy namespace is deprecated and will be removed in 2.0.0. For example, if you use scipy.rand or scipy.diag, you should change your code to directly use numpy.random.default_rng or numpy.diag, respectively. They remain available in the currently continuing Scipy 1.x release series.

Further deprecations fixed:

• DeprecationWarning: 'scipy.integrate.simps' is deprecated in favour of 'scipy.integrate.simpson' and will be removed in SciPy 1.14.0
• DeprecationWarning: Importing gaussian from 'scipy.signal' is deprecated since SciPy 1.1.0 and will raise an error in SciPy 1.13.0. Please use 'scipy.signal.windows.gaussian' or the convenience function 'scipy.signal.get_window' instead.
• DeprecationWarning: 'scipy.integrate.cumtrapz' is deprecated in favour of 'scipy.integrate.cumulative_trapezoid' and will be removed in SciPy 1.14.0
• DeprecationWarning: You are passing x=[0. ... ] as a positional argument. Please change your invocation to use keyword arguments. From SciPy 1.14, passing these as positional arguments will result in an error. F = simpson(I, x=xlin)

[coveralls]

coverage: 88.234% (-0.001%) from 88.235%
when pulling 0f70fb4 on INM-6:fix/scipy_deprecations_expired
into e2df1b9 on NeuralEnsemble:master.

[pep8speaks]

Hello @Moritz-Alexander-Kern! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file elephant/current_source_density.py:

Line 284:9: E741 ambiguous variable name 'I'
Line 296:9: E741 ambiguous variable name 'I'

Comment last updated at 2024-01-25 15:53:34 UTC

[kohlerca]

The changes look good to me. I confirm that the deprecation warnings and errors related to the new SciPy version are fixed.