machine-learning-for-trading
                                
                                
                                
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                        Chapter 20. build_us_stock_dataset variable AttributeError
Does anyone has an issue on chapter 20 "20_autoencoders_for_conditional_risk_factors/04_build_us_stock_dataset.ipynb" with the variable "yf-symbols = yf.Tickers(all_symbols) ?
I have got this error : AttributeError: 'float' object has no attribute 'upper'
