"if the infection rate depends on the number of infected neighbors" is inconsistent

[hadjipantelis]

First of all, thank you for making ndlib it is great.

Describe the bug
The infection rate depends on the number of infected neighbors (tp_rate) but while this is implemented in the modes SI, SIS and SEIR this is not implemented in SIR or SWIR. To that extent, tp_rate is even declared in the SIRmodel (

ndlib/ndlib/models/epidemics/SIRModel.py

Line 31 in 5493bbb

"tp_rate": {

) but then never used. Oddly, the documentation doesn't mention tp_rate, so the behaviour is inconsistent among otherwise similar models.

To Reproduce
Steps to reproduce the behavior:

• NDlib version: 5.1.1
• Operating System: Any
• Python version: Any
• Version(s) of NDlib required libraries: NA

Expected behavior
To use tp_rate throughout and allow the user to set it (if needed).