ソリューション:
questions_df = pd.read_csv("training_data.csv", sep=',', encoding='utf8')
置き換え
questions_df = pd.read_csv("training_data.csv", sep=',', encoding='unicode_escape')
ソリューション:
questions_df = pd.read_csv("training_data.csv", sep=',', encoding='utf8')
置き換え
questions_df = pd.read_csv("training_data.csv", sep=',', encoding='unicode_escape')