（图源：长春高新 2021 年年度报告）
與葡萄牙語一樣，我每天要完成四個簡短的任務與測驗；但這次我需要將 12 個完全聽不懂的聲音，配對到 12 個從未見過的物體圖片上。後來我才得知，這些物體與詞彙都不是真實存在的。我口中念出的其實是中文的聲調，而聲調是中文的重要特徵：不同聲調會改變一個詞的意思。
。关于这个话题，夫子提供了深入分析
GBDT (tree-boosting algorithm): 1.1x-1.5x faster fit/predict than the treeboost Rust crate2, 24-42x faster fit/1-5x faster predict than Python’s xgboost
As of Feb. 27, the Jackery Explorer 300 is on sale at Amazon. This is an incredibly lightweight, portable power option from Jackery that is perfect for carrying with you on outdoor trips. And right now it's down to its best-ever price, just $189 (down from $259).