Welcome to bta-lib
bta-lib stands for "backtrader ta-lib" (i.e.: "technical analysis
library"). As the name already states it is part of the backtrader family.
It is a pandas-based library focused on being usable, re-usable and easy to use
for developing and experimenting with new indicators.
And faithful to the contract the API offers: btalib.rsi delivers the actual
RSI and not something similar, something with values that will converge in
the future or well-known variants of the RSI.
Feel free to fork, clone, use, modify it ..
It could not be less than backtrader and that is why the library and its
components are fully documented.
The backtrader community does also host a section for bta-lib, where you can
see what others already asked, answered & shared.