The user wants me to revise the previous draft, which had 1377 Chinese characters, to fit within the 500-800 character range. I need to: 1. Keep the same structure: 3 subheadings
2. Address: what problem this course solves, suitable foundation, which sections to start with, what you can do independently after learning, how to use materials with exercises
3. Remove repetition and empty language
4. Output only HTML fragment with `
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5. No `/` tags
6. Count only Chinese characters (punctuation and English don't count)
7. Must not repeat the full course title, must be specific Let me draft a more concise version: Draft:
Let me count the Chinese characters: 小标题1: 这门课解决什么问题 = 9
正文1: 很多后端开发者在从业务代码走向算法落地时常面临双重困境一是面对模型调优时缺乏扎实的数理统计与优化理论基础难以排查过拟合欠拟合等工程问题二是算法原理虽懂但面对实际数据时特征工程怎么做经典模型如何工程化实现却找不到可落地的代码参考这门课聚焦于补足从数学原理到工程落地的鸿沟帮助开发者把算法能力真正转化为项目中的复用模块 Let me count:
很(1)多(2)后(3)端(4)开(5)发(6)者(7)在(8)从(9)业(10)务(11)代(12)码(13)走(14)向(15)算(16)法(17)落(18)地(19)时(20)常(21)面(22)临(23)双(24)重(25)困(26)境(27)一(28)是(29)面(30)对(31)模(32)型(33)调(34)优(35)时(36)缺(37)乏(38)扎(39)实(40)的(41)数(42)理(43)统(44)计(45)与(46)优(47)化(48)理(49)论(50)基(51)础(52)难(53)以(54)排(55)查(56)过(57)拟(58)合(59)欠(60)拟(61)合(62)等(63)工(64)程(65)问(66)题(67)二(68)是(69)算(70)法(71)原(72)理(73)虽(74)懂(75)但(76)面(77)对(78)实(79)际(80)数(81)据(82)时(83)特(84)征(85)工(86)程(87)做(88)不(89)了(90)经(91)典(92)模(93)型(94)如(95)何(96)工(97)程(98)化(99)实(100)现(101)却(102)找(103)不(1