搜尋引擎的誕生改變了人類查找資訊的方式,其背後的核心即是「搜尋演算法」。從最初的關鍵字比對到今天的語意理解與人工智慧驅動,搜尋演算法歷經數次重大演進。
1990年代初期,最早的搜尋工具如Archie與Lycos,只能根據關鍵字出現的頻率與位置進行簡單比對。這些演算法雖基本,但在當時已大大改善資訊檢索效率。然而,它們無法辨別網頁的真實品質,導致許多結果雜亂無章。
1998年,Google創辦人拉里·佩奇與謝爾蓋·布林推出PageRank演算法,透過分析網頁之間的連結數與權重來判斷網頁的重要性。這一創新機制不僅提升了搜尋品質,也奠定了Google成為全球搜尋霸主的基礎。
隨著使用者需求日益多元,搜尋演算法也逐漸進化。2013年推出的Hummingbird演算法開始強調「語意搜尋」,不再單靠字面比對,而是理解句子的含義。2015年的RankBrain則首次引入機器學習,根據使用者的點擊與反應,動態優化搜尋結果。
近年,BERT(Bidirectional Encoder Representations from Transformers)技術的應用更進一步突破語意理解的瓶頸,使搜尋引擎能準確掌握上下文與使用者真正意圖,提供更加精確的答案。
搜尋演算法的演進不僅是技術的突破,更深刻影響資訊社會的運作模式。從文字比對到語意分析,從固定邏輯到自我學習,搜尋引擎已成為人類智慧的一部分,未來的發展仍令人期待。
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