diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index e5d984f..86945cc 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -2,7 +2,6 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="be5bf74e-ad1c-4197-8a1f-ac93566d8aa7" name="Default" comment="init">
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/README.md" afterPath="$PROJECT_DIR$/README.md" />
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/机器学习/集成学习/GBDT.md" afterPath="$PROJECT_DIR$/机器学习/集成学习/GBDT.md" />
     </list>
     <ignored path="Reflection_Summary.iws" />
@@ -24,7 +23,7 @@
   </component>
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-      <file leaf-file-name="README.md" pinned="false" current-in-tab="true">
+      <file leaf-file-name="README.md" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/README.md">
           <provider editor-type-id="split-provider[text-editor;markdown-preview-editor]">
             <state split_layout="SPLIT">
@@ -48,12 +47,12 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="GBDT.md" pinned="false" current-in-tab="false">
+      <file leaf-file-name="GBDT.md" pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/机器学习/集成学习/GBDT.md">
           <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
             <state split_layout="SPLIT">
-              <first_editor relative-caret-position="505">
-                <caret line="103" column="2" selection-start-line="103" selection-start-column="2" selection-end-line="103" selection-end-column="12" />
+              <first_editor relative-caret-position="1440">
+                <caret line="96" column="22" selection-start-line="96" selection-start-column="22" selection-end-line="96" selection-end-column="22" />
                 <folding />
               </first_editor>
               <second_editor />
@@ -114,8 +113,8 @@
         <option value="$PROJECT_DIR$/机器学习/逻辑回归/lr.md" />
         <option value="$PROJECT_DIR$/机器学习/支持向量机/支持向量机.md" />
         <option value="$PROJECT_DIR$/数据预处理/特征提取/数据变换.md" />
-        <option value="$PROJECT_DIR$/机器学习/集成学习/GBDT.md" />
         <option value="$PROJECT_DIR$/README.md" />
+        <option value="$PROJECT_DIR$/机器学习/集成学习/GBDT.md" />
       </list>
     </option>
   </component>
@@ -495,9 +494,9 @@
   </component>
   <component name="ToolWindowManager">
     <frame x="0" y="23" width="1440" height="823" extended-state="0" />
-    <editor active="false" />
+    <editor active="true" />
     <layout>
-      <window_info id="Project" active="true" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.23462088" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
+      <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.23462088" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
       <window_info id="TODO" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="6" side_tool="false" content_ui="tabs" />
       <window_info id="Event Log" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="true" content_ui="tabs" />
       <window_info id="Database" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
@@ -1353,20 +1352,20 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/机器学习/集成学习/GBDT.md">
-      <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
+    <entry file="file://$PROJECT_DIR$/README.md">
+      <provider editor-type-id="split-provider[text-editor;markdown-preview-editor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="505">
-            <caret line="103" column="2" selection-start-line="103" selection-start-column="2" selection-end-line="103" selection-end-column="12" />
+          <first_editor relative-caret-position="0">
+            <caret line="0" column="0" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
             <folding />
           </first_editor>
           <second_editor />
         </state>
       </provider>
-      <provider editor-type-id="split-provider[text-editor;MarkdownPreviewEditor]">
+      <provider selected="true" editor-type-id="split-provider[text-editor;MarkdownPreviewEditor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="0">
-            <caret line="0" column="0" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+          <first_editor relative-caret-position="435">
+            <caret line="234" column="8" selection-start-line="234" selection-start-column="8" selection-end-line="234" selection-end-column="8" />
             <folding />
           </first_editor>
           <second_editor>
@@ -1375,20 +1374,20 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/README.md">
-      <provider editor-type-id="split-provider[text-editor;markdown-preview-editor]">
+    <entry file="file://$PROJECT_DIR$/机器学习/集成学习/GBDT.md">
+      <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="0">
-            <caret line="0" column="0" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+          <first_editor relative-caret-position="1440">
+            <caret line="96" column="22" selection-start-line="96" selection-start-column="22" selection-end-line="96" selection-end-column="22" />
             <folding />
           </first_editor>
           <second_editor />
         </state>
       </provider>
-      <provider selected="true" editor-type-id="split-provider[text-editor;MarkdownPreviewEditor]">
+      <provider editor-type-id="split-provider[text-editor;MarkdownPreviewEditor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="435">
-            <caret line="234" column="8" selection-start-line="234" selection-start-column="8" selection-end-line="234" selection-end-column="8" />
+          <first_editor relative-caret-position="0">
+            <caret line="0" column="0" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
             <folding />
           </first_editor>
           <second_editor>
diff --git "a/\346\234\272\345\231\250\345\255\246\344\271\240/\351\233\206\346\210\220\345\255\246\344\271\240/GBDT.md" "b/\346\234\272\345\231\250\345\255\246\344\271\240/\351\233\206\346\210\220\345\255\246\344\271\240/GBDT.md"
index 8c35236..a305700 100644
--- "a/\346\234\272\345\231\250\345\255\246\344\271\240/\351\233\206\346\210\220\345\255\246\344\271\240/GBDT.md"
+++ "b/\346\234\272\345\231\250\345\255\246\344\271\240/\351\233\206\346\210\220\345\255\246\344\271\240/GBDT.md"
@@ -72,10 +72,13 @@ Cart tree，但是都是回归树
 # feature属性会被重复多次使用么？
 会，同时因为特征会进行多次使用，特征用的越多，则该特征的重要性越大
 
-# 如何进行子采样的？
-每一棵树基于原始原本的一个子集进行训练
-- rf是有放回采样，gbdt是无放回采样
-- 特征子采样可以来控制模型整体的方差
+# gbdt如何进行正则化的？
+- 子采样
+    - 每一棵树基于原始原本的一个子集进行训练
+    - rf是有放回采样，gbdt是无放回采样
+    - 特征子采样可以来控制模型整体的方差
+- 利用Shrinkage收缩，控制每一棵子树的贡献度
+- 每棵Cart树的枝剪
 
 # 为什么集成算法大多使用树类模型作为基学习器？或者说，为什么集成学习可以在树类模型上取得成功？
 - 对数据的要求比较低，不需要强假设，不需要数据预处理，连续离散都可以，缺失值也能接受