Question about the momentum_backtest

[Erica-Ko]

Hello, I am new to the toolbox. I have the following questions:

1. When I try to modify the strategy, I add some features like ma_50, ma_200, the current ma value minus the previous one etc., and following the instruction to add those features. However, I encountered a bunch of WARNING:root:NaN or Inf found in input tensor. when running the start trading function. The sample file is attached. How should I solve the problem?
   momentum_backtest.zip

2. May someone explains the logic of the code of Hurst components? It seems a different approach from the reference link provided or maybe I just don't understand the logic.

Thank you a lot for your help.