Yang

Results 3 issues of Yang

Correct typo - 'Itride' to 'Stride'

**Is your feature request related to a problem? Please describe.** The majority of the functionalities in FinRL-meta are daily based, including technical `INDICATORS` and `StockTradingEnv`. If want to trade in...

In rare cases, the OLS returns only slope without intercept. This PR is to detect the number of results returns for an extra layer of protection.