diff --git a/.idea/ImageMarket.iml b/.idea/ImageMarket.iml
new file mode 100644
index 0000000..78b2cc5
--- /dev/null
+++ b/.idea/ImageMarket.iml
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4" />
\ No newline at end of file
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index da4cc3b..d280c68 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -6,6 +6,7 @@
         <sourceOutputDir name="target/generated-sources/annotations" />
         <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
         <outputRelativeToContentRoot value="true" />
+        <module name="ImageMarket" />
         <module name="myBrain" />
       </profile>
     </annotationProcessing>
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 4b661a5..3ccb27b 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
   <component name="MavenProjectsManager">
     <option name="originalFiles">
       <list>
diff --git a/src/main/java/org/wlld/MatrixTools/MatrixOperation.java b/src/main/java/org/wlld/MatrixTools/MatrixOperation.java
index c953912..0f5f374 100644
--- a/src/main/java/org/wlld/MatrixTools/MatrixOperation.java
+++ b/src/main/java/org/wlld/MatrixTools/MatrixOperation.java
@@ -39,8 +39,8 @@ public class MatrixOperation {
     }
 
     public static double getNormCos(Matrix matrix1, Matrix matrix2) throws Exception {//求两个向量之间的余弦
-        double inner = MatrixOperation.innerProduct(matrix1, matrix2);
-        double mulNorm = ArithUtil.mul(MatrixOperation.getNorm(matrix1), MatrixOperation.getNorm(matrix2));
+        double inner = innerProduct(matrix1, matrix2);
+        double mulNorm = ArithUtil.mul(getNorm(matrix1), getNorm(matrix2));
         return ArithUtil.div(inner, mulNorm);
     }