Fix ToC

Author: mikebo93

chapter_preface_basic/Index.md

@@ -1,4 +1,5 @@
-# Part I Framework Design {#part-i-framework-design .unnumbered}
+# Part I Framework Design
+:label:`part-i-framework-design`
 
 In Part 1, we present a top-down approach to designing a machine
 learning framework. We begin by introducing the design of programming

chapter_preface_extension/Index.md

@@ -1,4 +1,5 @@
-# Part II Application Scenarios {#part-ii-application-scenarios .unnumbered}
+# Part II Application Scenarios
+:label:`part-ii-application-scenarios`
 
 In Part II, we will introduce various scenarios of applying machine
 learning frameworks. These scenarios include federated learning systems,

index.md

@@ -28,13 +28,6 @@ chapter_preface_extension/index
 chapter_recommender_system/index
 chapter_reinforcement_learning/index
 chapter_robot/index
-
-
-
-
-
-
-
 ```
 
 ```toc