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Python 中稀疏矩阵的神奇力量

  • 2026-02-08 05:23:04
Python 中稀疏矩阵的神奇力量

Python 中稀疏矩阵的神奇力量

大家好，今天，我们探讨到一个在自然语言处理 和推荐系统中非常重要的工具：稀疏矩阵和余弦相似度。
别担心，我会用最直白、最易理解的语言讲解，还会给出完整的代码示例和详细的数学基础推导，让小白也能轻松上手。
看完本文，你会有一个巨大的思维飞跃，有几万条记录的语料库，如何快速计算相似度？如何高效排序？答案尽在下文。看完记得点赞、收藏、转发哦！

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  1. CONNECT:[ UseTime:0.000441s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000569s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000244s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006041s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000510s ]
  6. SELECT * FROM `set` [ RunTime:0.003371s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000712s ]
  8. SELECT * FROM `article` WHERE `id` = 465542 LIMIT 1 [ RunTime:0.000559s ]
  9. UPDATE `article` SET `lasttime` = 1770513761 WHERE `id` = 465542 [ RunTime:0.002788s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.005971s ]
  11. SELECT * FROM `article` WHERE `id` < 465542 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000526s ]
  12. SELECT * FROM `article` WHERE `id` > 465542 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008743s ]
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  15. SELECT * FROM `article` WHERE `id` < 465542 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000955s ]
0.118011s