Merge branch 'master' of https://github.com/apache/incubator-nlpcraft
diff --git a/bin/prepare.sh b/bin/prepare.sh
index dc23544..dbf2f8e 100755
--- a/bin/prepare.sh
+++ b/bin/prepare.sh
@@ -79,6 +79,7 @@
 
 rsync -avzq bin ${zipDir}/${tmpDir} --exclude '**/.DS_Store' --exclude bin/prepare.sh --exclude bin/MAVEN-RELEASE.md
 rsync -avzq openapi ${zipDir}/${tmpDir} --exclude '**/.DS_Store'
+rsync -avzq idea ${zipDir}/${tmpDir} --exclude '**/.DS_Store'
 
 function cpSrc() {
   rsync -avzq "$1"/src ${zipDir}/${tmpDir}/"$1" --exclude '**/.DS_Store' --exclude '**/*.iml'
diff --git a/nlpcraft/src/test/scala/org/apache/nlpcraft/model/sparse/NCSparseSpec.scala b/nlpcraft/src/test/scala/org/apache/nlpcraft/model/sparse/NCSparseSpec.scala
index 997150f..6f1b71b 100644
--- a/nlpcraft/src/test/scala/org/apache/nlpcraft/model/sparse/NCSparseSpec.scala
+++ b/nlpcraft/src/test/scala/org/apache/nlpcraft/model/sparse/NCSparseSpec.scala
@@ -23,7 +23,6 @@
 import org.junit.jupiter.api.Test
 
 import java.util
-import scala.collection.mutable
 import scala.jdk.CollectionConverters.CollectionHasAsScala
 
 class NCSparseModel extends NCAbstractTokensModel {