1. Documentation scipy integrate odeint. https://docs.scipy.org/doc/scipy/reference/generated/scipy.integrate.odeint.html.
2. Dynaml. https://github.com/transcendent-ai-labs/DynaML/tree/master/data.
3. jitcddeneutral. https://github.com/neurophysik/jitcdde/blob/master/examples/neutral.py.
4. Linear correlation. https://condor.depaul.edu/sjost/it223/documents/correlation.htm.
5. User guide r2. https://scikit-learn.org/stable/modules/model_evaluation.html#r2-score.