function naming convention

[agramfort]

what are the naming convention for functions?

• is seems weird that get_spectra is the only name that starts with get_*. Why not spectra?
• functions that returns similar quantities (eg. PSD estimates) should have common name prefix (or maybe suffix).
• freq_response should make explicit that it works on IR models.
• I don't like get_spectra_bi as it reminds me of bispectrum estimates which is not.
• functions that are auxiliary functions (ie should not be used by average user) should start with _ to be explicitly marked as private (eg. it seems in coherence.py that all foo_compute functions are auxiliary functions to foo functions hence should be name rather _foo). The point is that the user should quickly see which function to use.
• why sometimes mtm_ and sometimes multi_taper_ to refer to multi-taper method?

below the list of functions in spectral.

algorithms/spectral.py:
20 : def get_spectra(time_series, method=None):
144 : def get_spectra_bi(x, y, method=None):
186 : def periodogram(s, Fs=2 * np.pi, Sk=None, N=None, sides='default',
262 : def periodogram_csd(s, Fs=2 * np.pi, Sk=None, NFFT=None, sides='default',
369 : def dpss_windows(N, NW, Kmax):
449 : def mtm_cross_spectrum(tx, ty, weights, sides='twosided'):
557 : def multi_taper_psd(s, Fs=2 * np.pi, BW=None, adaptive=False,
710 : def multi_taper_csd(s, Fs=2 * np.pi, BW=None, low_bias=True,
834 : def freq_response(b, a=1., n_freqs=1024, sides='onesided'):