Cython speedup on custom distclassipy metrics

[sidchaini]

Written non-SciPy functions in Cython to enable SciPy-like speedup in compute speed & performance.

[sidchaini]

Classifier speed-up

Distance Metric	Old Time (s)	Cython Time (s)	Speedup
meehl	0.07970	0.00184	43.32x
divergence	0.05467	0.00183	29.87x
penroseshape	0.05428	0.00189	28.72x
hellinger	0.04485	0.00166	27.02x
clark	0.04836	0.00188	25.72x
add_chisq	0.03995	0.00168	23.78x
prob_chisq	0.03728	0.00167	22.32x
squared_chisq	0.03705	0.00169	21.92x
vicis_symmetric_chisq	0.04066	0.00207	19.64x
wave_hedges	0.04291	0.00230	18.66x
matusita	0.02933	0.00162	18.10x
vicis_wave_hedges	0.03735	0.00214	17.45x
taneja	0.06286	0.00377	16.67x
squaredchord	0.02692	0.00167	16.12x
tanimoto	0.02795	0.00176	15.88x
google	0.02754	0.00175	15.74x
acc	0.03339	0.00215	15.53x
sorensen	0.02224	0.00157	14.17x
czekanowski	0.02222	0.00157	14.15x
kulczynski	0.02338	0.00180	12.99x
soergel	0.02251	0.00177	12.72x
motyka	0.02059	0.00176	11.70x
jensenshannon_divergence	0.08277	0.00719	11.51x
ruzicka	0.02117	0.00188	11.26x
topsoe	0.07750	0.00711	10.90x
jeffreys	0.05003	0.00477	10.49x
kumarjohnson	0.06274	0.00617	10.17x
gower	0.01366	0.00149	9.17x
jensen_difference	0.07820	0.00865	9.04x
lorentzian	0.03221	0.00408	7.89x
jaccard	0.01239	0.00184	6.73x
chebyshev_min	0.01342	0.00210	6.39x
marylandbridge	0.01041	0.00171	6.09x
squared_euclidean	0.00844	0.00156	5.41x
dice	0.00177	0.00164	1.08x

Anomaly detector speedup

Distance Metric	Old Time (s)	Cython Time (s)	Speedup
DistanceAnomaly	0.40381	0.01542	26.19x