diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 99af75e..f3dd26a 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -2,10 +2,13 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="d349b53e-420f-413a-bf14-978e0f6fabc4" name="Default Changelist" comment="">
+      <change afterPath="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/tools/PairTest.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/build.gradle" beforeDir="false" afterPath="$PROJECT_DIR$/build.gradle" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernel.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernel.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/provider/DayTimeProvider.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/provider/DayTimeProvider.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/tools/Pair.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/tools/Pair.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernelTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernelTest.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/provider/DayTimeProviderTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/provider/DayTimeProviderTest.java" afterDir="false" />
     </list>
     <ignored path="$PROJECT_DIR$/classes/" />
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
@@ -15,7 +18,7 @@
     <option name="LAST_RESOLUTION" value="IGNORE" />
   </component>
   <component name="CoverageViewManager">
-    <option name="myElementSize" value="249" />
+    <option name="myElementSize" value="282" />
   </component>
   <component name="DatabaseView">
     <option name="SHOW_INTERMEDIATE" value="true" />
@@ -87,8 +90,8 @@
       <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernel.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="353">
-              <caret line="147" selection-start-line="147" selection-end-line="147" />
+            <state relative-caret-position="153">
+              <caret line="25" column="58" selection-start-line="25" selection-start-column="36" selection-end-line="25" selection-end-column="58" />
               <folding>
                 <element signature="imports" expanded="true" />
               </folding>
@@ -96,97 +99,115 @@
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernelTest.java">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="178">
-              <caret line="76" column="56" selection-start-line="76" selection-start-column="56" selection-end-line="76" selection-end-column="56" />
-            </state>
-          </provider>
-        </entry>
-      </file>
       <file pinned="false" current-in-tab="false">
-        <entry file="jar://$MAVEN_REPOSITORY$/junit/junit/4.12/junit-4.12.jar!/org/junit/internal/runners/model/ReflectiveCallable.class">
+        <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/Behaiv.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="210">
-              <caret line="17" selection-start-line="17" selection-end-line="17" />
+            <state relative-caret-position="531">
+              <caret line="113" column="62" selection-start-line="113" selection-start-column="62" selection-end-line="113" selection-end-column="62" />
             </state>
           </provider>
         </entry>
       </file>
       <file pinned="false" current-in-tab="false">
-        <entry file="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.ejml/ejml-simple/0.38/cd7516e71525d51adcb07fab4688acb25b0d8f5d/ejml-simple-0.38-sources.jar!/org/ejml/simple/SimpleBase.java">
+        <entry file="file://$PROJECT_DIR$/build.gradle">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="326">
-              <caret line="1258" column="21" selection-start-line="1258" selection-start-column="21" selection-end-line="1258" selection-end-column="21" />
+            <state relative-caret-position="360">
+              <caret line="24" column="28" selection-start-line="24" selection-start-column="28" selection-end-line="24" selection-end-column="28" />
+              <folding>
+                <element signature="n#!!doc" expanded="true" />
+              </folding>
             </state>
           </provider>
         </entry>
       </file>
       <file pinned="false" current-in-tab="false">
-        <entry file="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.ejml/ejml-core/0.38/3605fc3e3b3de0343e4d0c365cd5207918ac6058/ejml-core-0.38-sources.jar!/org/ejml/ops/MatrixIO.java">
+        <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/logistic/LogisticUtilsTest.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="386">
-              <caret line="54" column="13" lean-forward="true" selection-start-line="54" selection-start-column="13" selection-end-line="54" selection-end-column="13" />
+            <state relative-caret-position="160">
+              <caret line="49" selection-start-line="49" selection-end-line="49" />
+              <folding>
+                <element signature="imports" expanded="true" />
+              </folding>
             </state>
           </provider>
         </entry>
       </file>
       <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/Kernel.java">
+        <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernelTest.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="235">
-              <caret line="63" selection-start-line="63" selection-end-line="63" />
+            <state relative-caret-position="388">
+              <caret line="116" column="31" selection-start-line="116" selection-start-column="31" selection-end-line="116" selection-end-column="31" />
               <folding>
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-                <element signature="e#1154#1155#0" expanded="true" />
-                <element signature="e#1208#1209#0" expanded="true" />
+                <element signature="imports" expanded="true" />
               </folding>
             </state>
           </provider>
         </entry>
       </file>
       <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/Behaiv.java">
+        <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/provider/DayTimeProvider.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="553">
-              <caret line="113" column="19" selection-start-line="113" selection-start-column="19" selection-end-line="113" selection-end-column="19" />
+            <state relative-caret-position="-114">
+              <caret line="19" column="30" lean-forward="true" selection-start-line="19" selection-start-column="30" selection-end-line="19" selection-end-column="30" />
             </state>
           </provider>
         </entry>
       </file>
       <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/storage/BehaivStorage.java">
+        <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/provider/DayTimeProviderTest.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="105">
-              <caret line="8" lean-forward="true" selection-start-line="8" selection-end-line="8" />
+            <state relative-caret-position="120">
+              <caret line="16" lean-forward="true" selection-start-line="16" selection-end-line="16" />
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           </provider>
         </entry>
       </file>
       <file pinned="false" current-in-tab="false">
-        <entry file="jar://$PROJECT_DIR$/../../../development/sdk/graalvm-ce-19.0.0/Contents/Home/src.zip!/java/io/OptionalDataException.java">
+        <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/Kernel.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="465">
-              <caret line="54" column="4" selection-start-line="54" selection-start-column="4" selection-end-line="54" selection-end-column="4" />
+            <state relative-caret-position="-62">
+              <caret line="14" column="22" selection-start-line="14" selection-start-column="22" selection-end-line="14" selection-end-column="22" />
+              <folding>
+                <element signature="imports" expanded="true" />
+                <element signature="e#513#514#0" expanded="true" />
+                <element signature="e#541#542#0" expanded="true" />
+                <element signature="e#800#801#0" expanded="true" />
+                <element signature="e#830#831#0" expanded="true" />
+                <element signature="e#876#877#0" expanded="true" />
+                <element signature="e#916#917#0" expanded="true" />
+                <element signature="e#955#956#0" expanded="true" />
+                <element signature="e#1000#1001#0" expanded="true" />
+                <element signature="e#1155#1156#0" expanded="true" />
+                <element signature="e#1205#1206#0" expanded="true" />
+              </folding>
             </state>
           </provider>
         </entry>
       </file>
       <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/storage/SimpleStorage.java">
+        <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/tools/Pair.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="435">
-              <caret line="32" column="8" selection-start-line="32" selection-start-column="8" selection-end-line="32" selection-end-column="20" />
+            <state relative-caret-position="495">
+              <caret line="39" column="36" selection-start-line="39" selection-start-column="36" selection-end-line="39" selection-end-column="36" />
               <folding>
-                <element signature="e#382#383#0" expanded="true" />
-                <element signature="e#424#425#0" expanded="true" />
+                <element signature="e#257#258#0" expanded="true" />
+                <element signature="e#311#312#0" expanded="true" />
+                <element signature="e#847#848#0" expanded="true" />
+                <element signature="e#890#891#0" expanded="true" />
               </folding>
             </state>
           </provider>
         </entry>
       </file>
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/tools/PairTest.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="109">
+              <caret line="22" column="61" selection-start-line="22" selection-start-column="61" selection-end-line="22" selection-end-column="61" />
+            </state>
+          </provider>
+        </entry>
+      </file>
     </leaf>
   </component>
   <component name="FileTemplateManagerImpl">
@@ -202,13 +223,21 @@
       <find>iterations</find>
       <find>println</find>
       <find>primitive</find>
+      <find>Pair.of</find>
+      <find>import org.apache.commons.lang3.tuple.Pair;</find>
+      <find>org.apache.commons.math3.util.Pair</find>
     </findStrings>
+    <replaceStrings>
+      <replace>new Pair&lt;&gt;</replace>
+      <replace>import org.apache.commons.math3.util.Pair;</replace>
+      <replace>de.dmi3y.behaiv.tools.Pair</replace>
+    </replaceStrings>
   </component>
   <component name="Git.Settings">
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
     <option name="RECENT_BRANCH_BY_REPOSITORY">
       <map>
-        <entry key="$PROJECT_DIR$" value="feature/java_implementation" />
+        <entry key="$PROJECT_DIR$" value="feature/api_improvements" />
       </map>
     </option>
   </component>
@@ -218,20 +247,24 @@
         <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/logistic/LogisticUtils.java" />
         <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/node/ActionableNode.java" />
         <option value="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/logistic/LogisticUtilsTest.java" />
-        <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/Kernel.java" />
-        <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/Behaiv.java" />
         <option value="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/DummyKernelTest.java" />
-        <option value="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/LibraryTest.java" />
         <option value="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/storage/TemporaryStorage.java" />
         <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/node/BehaivNode.java" />
         <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/DummyKernel.java" />
         <option value="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/BehaivTest.java" />
-        <option value="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/KernelTest.java" />
-        <option value="$PROJECT_DIR$/build.gradle" />
         <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/storage/SimpleStorage.java" />
         <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/storage/BehaivStorage.java" />
+        <option value="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/LibraryTest.java" />
+        <option value="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/KernelTest.java" />
+        <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/Behaiv.java" />
+        <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/Kernel.java" />
+        <option value="$PROJECT_DIR$/build.gradle" />
         <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernel.java" />
         <option value="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernelTest.java" />
+        <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/provider/DayTimeProvider.java" />
+        <option value="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/provider/DayTimeProviderTest.java" />
+        <option value="$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/tools/Pair.java" />
+        <option value="$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/tools/PairTest.java" />
       </list>
     </option>
   </component>
@@ -254,6 +287,7 @@
       <foldersAlwaysOnTop value="true" />
     </navigator>
     <panes>
+      <pane id="PackagesPane" />
       <pane id="ProjectPane">
         <subPane>
           <expand>
@@ -306,24 +340,6 @@
               <item name="kernel" type="462c0819:PsiDirectoryNode" />
               <item name="logistic" type="462c0819:PsiDirectoryNode" />
             </path>
-            <path>
-              <item name="behaiv" type="b2602c69:ProjectViewProjectNode" />
-              <item name="core" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
-              <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="main" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
-              <item name="java" type="462c0819:PsiDirectoryNode" />
-              <item name="behaiv" type="462c0819:PsiDirectoryNode" />
-              <item name="session" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="behaiv" type="b2602c69:ProjectViewProjectNode" />
-              <item name="core" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
-              <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="main" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
-              <item name="java" type="462c0819:PsiDirectoryNode" />
-              <item name="behaiv" type="462c0819:PsiDirectoryNode" />
-              <item name="storage" type="462c0819:PsiDirectoryNode" />
-            </path>
             <path>
               <item name="behaiv" type="b2602c69:ProjectViewProjectNode" />
               <item name="core" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
@@ -358,7 +374,6 @@
           <select />
         </subPane>
       </pane>
-      <pane id="PackagesPane" />
       <pane id="Scope" />
     </panes>
   </component>
@@ -372,6 +387,7 @@
     <property name="last_opened_file_path" value="$PROJECT_DIR$/build.gradle" />
     <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
     <property name="nodejs_npm_path_reset_for_default_project" value="true" />
+    <property name="nodejs_package_manager_path" value="npm" />
     <property name="project.structure.last.edited" value="Libraries" />
     <property name="project.structure.proportion" value="0.15" />
     <property name="project.structure.side.proportion" value="0.12531328" />
@@ -379,6 +395,8 @@
   </component>
   <component name="RecentsManager">
     <key name="CreateTestDialog.RecentsKey">
+      <recent name="de.dmi3y.behaiv.tools" />
+      <recent name="de.dmi3y.behaiv.provider" />
       <recent name="de.dmi3y.behaiv.kernel.logistic" />
     </key>
     <key name="CreateTestDialog.Recents.Supers">
@@ -398,76 +416,65 @@
     </option>
   </component>
   <component name="RunManager" selected="JUnit.Whole project">
-    <configuration name="core [coveralls]" type="GradleRunConfiguration" factoryName="Gradle" temporary="true">
-      <ExternalSystemSettings>
-        <option name="env">
-          <map>
-            <entry key="COVERALLS_REPO_TOKEN" value="2ldgKrIWejc1nM81dg74apT78FSwv9Ec4" />
-          </map>
-        </option>
-        <option name="executionName" />
-        <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="externalSystemIdString" value="GRADLE" />
-        <option name="scriptParameters" value="" />
-        <option name="taskDescriptions">
-          <list />
-        </option>
-        <option name="taskNames">
-          <list>
-            <option value="coveralls" />
-          </list>
-        </option>
-        <option name="vmOptions" value="" />
-      </ExternalSystemSettings>
-      <GradleScriptDebugEnabled>true</GradleScriptDebugEnabled>
-      <method v="2" />
+    <configuration name="DayTimeProviderTest.getFeatureAll" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+      <module name="behaiv.test" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="de.dmi3y.behaiv.provider.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <option name="PACKAGE_NAME" value="de.dmi3y.behaiv.provider" />
+      <option name="MAIN_CLASS_NAME" value="de.dmi3y.behaiv.provider.DayTimeProviderTest" />
+      <option name="METHOD_NAME" value="getFeatureAll" />
+      <option name="TEST_OBJECT" value="method" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
     </configuration>
-    <configuration name="core [jacocoTestReport]" type="GradleRunConfiguration" factoryName="Gradle" temporary="true">
-      <ExternalSystemSettings>
-        <option name="executionName" />
-        <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="externalSystemIdString" value="GRADLE" />
-        <option name="scriptParameters" />
-        <option name="taskDescriptions">
-          <list />
-        </option>
-        <option name="taskNames">
-          <list>
-            <option value="jacocoTestReport" />
-          </list>
-        </option>
-        <option name="vmOptions" />
-      </ExternalSystemSettings>
-      <GradleScriptDebugEnabled>true</GradleScriptDebugEnabled>
-      <method v="2" />
+    <configuration name="PairTest.create" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+      <module name="behaiv.test" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="de.dmi3y.behaiv.tools.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <option name="PACKAGE_NAME" value="de.dmi3y.behaiv.tools" />
+      <option name="MAIN_CLASS_NAME" value="de.dmi3y.behaiv.tools.PairTest" />
+      <option name="METHOD_NAME" value="create" />
+      <option name="TEST_OBJECT" value="method" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
     </configuration>
-    <configuration name="KernelTest.kernel_saveAndRestore_expectNormalFlow" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+    <configuration name="PairTest.hashCode1" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
       <module name="behaiv.test" />
       <extension name="coverage">
         <pattern>
-          <option name="PATTERN" value="de.dmi3y.behaiv.kernel.*" />
+          <option name="PATTERN" value="de.dmi3y.behaiv.tools.*" />
           <option name="ENABLED" value="true" />
         </pattern>
       </extension>
-      <option name="PACKAGE_NAME" value="de.dmi3y.behaiv.kernel" />
-      <option name="MAIN_CLASS_NAME" value="de.dmi3y.behaiv.kernel.KernelTest" />
-      <option name="METHOD_NAME" value="kernel_saveAndRestore_expectNormalFlow" />
+      <option name="PACKAGE_NAME" value="de.dmi3y.behaiv.tools" />
+      <option name="MAIN_CLASS_NAME" value="de.dmi3y.behaiv.tools.PairTest" />
+      <option name="METHOD_NAME" value="hashCode1" />
       <option name="TEST_OBJECT" value="method" />
       <method v="2">
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="LogisticRegressionKernelTest.storeResults_saveDataAndThenTheta_expectNormalFlow" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+    <configuration name="PairTest.toString1" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
       <module name="behaiv.test" />
       <extension name="coverage">
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-    <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/DummyKernelTest.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/storage/SimpleStorage.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="165">
-          <caret line="16" column="33" selection-start-line="16" selection-start-column="33" selection-end-line="16" selection-end-column="33" />
+        <state relative-caret-position="435">
+          <caret line="32" column="8" selection-start-line="32" selection-start-column="8" selection-end-line="32" selection-end-column="20" />
+          <folding>
+            <element signature="e#382#383#0" expanded="true" />
+            <element signature="e#424#425#0" expanded="true" />
+          </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/DummyKernel.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/storage/BehaivStorage.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="75">
-          <caret line="8" column="17" selection-start-line="8" selection-start-column="17" selection-end-line="8" selection-end-column="17" />
+        <state relative-caret-position="105">
+          <caret line="8" selection-start-line="8" selection-end-line="8" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/BehaivTest.java">
+    <entry file="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.ejml/ejml-simple/0.38/cd7516e71525d51adcb07fab4688acb25b0d8f5d/ejml-simple-0.38-sources.jar!/org/ejml/simple/SimpleBase.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="435">
-          <caret line="29" column="36" selection-start-line="29" selection-start-column="36" selection-end-line="29" selection-end-column="36" />
-          <folding>
-            <element signature="imports" expanded="true" />
-          </folding>
+        <state relative-caret-position="326">
+          <caret line="1258" column="21" selection-start-line="1258" selection-start-column="21" selection-end-line="1258" selection-end-column="21" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/build.gradle">
+    <entry file="jar://$MAVEN_REPOSITORY$/junit/junit/4.12/junit-4.12.jar!/org/junit/internal/runners/model/ReflectiveCallable.class">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="128">
-          <caret line="25" selection-start-line="25" selection-end-line="25" />
-          <folding>
-            <element signature="n#!!doc" expanded="true" />
-          </folding>
+        <state relative-caret-position="210">
+          <caret line="17" selection-start-line="17" selection-end-line="17" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/logistic/LogisticUtils.java">
+    <entry file="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.ejml/ejml-core/0.38/3605fc3e3b3de0343e4d0c365cd5207918ac6058/ejml-core-0.38-sources.jar!/org/ejml/ops/MatrixIO.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="495">
-          <caret line="33" column="5" selection-start-line="33" selection-start-column="5" selection-end-line="33" selection-end-column="5" />
-          <folding>
-            <element signature="imports" expanded="true" />
-          </folding>
+        <state relative-caret-position="465">
+          <caret line="54" column="13" selection-start-line="54" selection-start-column="13" selection-end-line="54" selection-end-column="13" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/storage/TemporaryStorage.java">
+    <entry file="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.apache.commons/commons-lang3/3.9/8f1cb192e229bc4cd1c900c51171d96706e6d195/commons-lang3-3.9-sources.jar!/org/apache/commons/lang3/tuple/Pair.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="75">
-          <caret line="6" column="13" selection-start-line="6" selection-start-column="13" selection-end-line="6" selection-end-column="13" />
-          <folding>
-            <element signature="e#386#387#0" expanded="true" />
-            <element signature="e#414#415#0" expanded="true" />
-          </folding>
+        <state relative-caret-position="315">
+          <caret line="40" column="22" selection-start-line="40" selection-start-column="22" selection-end-line="40" selection-end-column="22" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/KernelTest.java">
+    <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/LibraryTest.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="215">
-          <caret line="55" column="24" selection-start-line="55" selection-start-column="24" selection-end-line="55" selection-end-column="24" />
+        <state relative-caret-position="600">
+          <caret line="42" column="9" selection-start-line="42" selection-start-column="9" selection-end-line="42" selection-end-column="9" />
           <folding>
-            <element signature="method#getTrainingArray#0;class#KernelTest#0" />
+            <element signature="imports" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="jar://$PROJECT_DIR$/../../../development/sdk/graalvm-ce-19.0.0/Contents/Home/src.zip!/java/io/OptionalDataException.java">
+    <entry file="jar://$MAVEN_REPOSITORY$/org/apache/commons/commons-math3/3.6.1/commons-math3-3.6.1.jar!/org/apache/commons/math3/util/Pair.class">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="465">
-          <caret line="54" column="4" selection-start-line="54" selection-start-column="4" selection-end-line="54" selection-end-column="4" />
+        <state relative-caret-position="301">
+          <caret line="86" selection-start-line="7" selection-end-line="86" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/storage/SimpleStorage.java">
+    <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/KernelTest.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="435">
-          <caret line="32" column="8" selection-start-line="32" selection-start-column="8" selection-end-line="32" selection-end-column="20" />
+        <state relative-caret-position="343">
+          <caret line="23" column="32" selection-start-line="23" selection-start-column="32" selection-end-line="23" selection-end-column="32" />
           <folding>
-            <element signature="e#382#383#0" expanded="true" />
-            <element signature="e#424#425#0" expanded="true" />
+            <element signature="imports" expanded="true" />
+            <element signature="method#getTrainingArray#0;class#KernelTest#0" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/storage/BehaivStorage.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/Behaiv.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="105">
-          <caret line="8" lean-forward="true" selection-start-line="8" selection-end-line="8" />
+        <state relative-caret-position="531">
+          <caret line="113" column="62" selection-start-line="113" selection-start-column="62" selection-end-line="113" selection-end-column="62" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/Behaiv.java">
+    <entry file="file://$PROJECT_DIR$/build.gradle">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="553">
-          <caret line="113" column="19" selection-start-line="113" selection-start-column="19" selection-end-line="113" selection-end-column="19" />
+        <state relative-caret-position="360">
+          <caret line="24" column="28" selection-start-line="24" selection-start-column="28" selection-end-line="24" selection-end-column="28" />
+          <folding>
+            <element signature="n#!!doc" expanded="true" />
+          </folding>
         </state>
       </provider>
     </entry>
-    <entry file="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.ejml/ejml-simple/0.38/cd7516e71525d51adcb07fab4688acb25b0d8f5d/ejml-simple-0.38-sources.jar!/org/ejml/simple/SimpleBase.java">
+    <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/logistic/LogisticUtilsTest.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="326">
-          <caret line="1258" column="21" selection-start-line="1258" selection-start-column="21" selection-end-line="1258" selection-end-column="21" />
+        <state relative-caret-position="160">
+          <caret line="49" selection-start-line="49" selection-end-line="49" />
+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
         </state>
       </provider>
     </entry>
-    <entry file="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.ejml/ejml-core/0.38/3605fc3e3b3de0343e4d0c365cd5207918ac6058/ejml-core-0.38-sources.jar!/org/ejml/ops/MatrixIO.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/Kernel.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="386">
-          <caret line="54" column="13" lean-forward="true" selection-start-line="54" selection-start-column="13" selection-end-line="54" selection-end-column="13" />
+        <state relative-caret-position="-62">
+          <caret line="14" column="22" selection-start-line="14" selection-start-column="22" selection-end-line="14" selection-end-column="22" />
+          <folding>
+            <element signature="imports" expanded="true" />
+            <element signature="e#513#514#0" expanded="true" />
+            <element signature="e#541#542#0" expanded="true" />
+            <element signature="e#800#801#0" expanded="true" />
+            <element signature="e#830#831#0" expanded="true" />
+            <element signature="e#876#877#0" expanded="true" />
+            <element signature="e#916#917#0" expanded="true" />
+            <element signature="e#955#956#0" expanded="true" />
+            <element signature="e#1000#1001#0" expanded="true" />
+            <element signature="e#1155#1156#0" expanded="true" />
+            <element signature="e#1205#1206#0" expanded="true" />
+          </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/Kernel.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernel.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="235">
-          <caret line="63" selection-start-line="63" selection-end-line="63" />
+        <state relative-caret-position="153">
+          <caret line="25" column="58" selection-start-line="25" selection-start-column="36" selection-end-line="25" selection-end-column="58" />
           <folding>
-            <element signature="e#799#800#0" expanded="true" />
-            <element signature="e#829#830#0" expanded="true" />
-            <element signature="e#1154#1155#0" expanded="true" />
-            <element signature="e#1208#1209#0" expanded="true" />
+            <element signature="imports" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernel.java">
+    <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernelTest.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="353">
-          <caret line="147" selection-start-line="147" selection-end-line="147" />
+        <state relative-caret-position="388">
+          <caret line="116" column="31" selection-start-line="116" selection-start-column="31" selection-end-line="116" selection-end-column="31" />
           <folding>
             <element signature="imports" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="jar://$MAVEN_REPOSITORY$/junit/junit/4.12/junit-4.12.jar!/org/junit/internal/runners/model/ReflectiveCallable.class">
+    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/provider/DayTimeProvider.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="210">
-          <caret line="17" selection-start-line="17" selection-end-line="17" />
+        <state relative-caret-position="-114">
+          <caret line="19" column="30" lean-forward="true" selection-start-line="19" selection-start-column="30" selection-end-line="19" selection-end-column="30" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernelTest.java">
+    <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/provider/DayTimeProviderTest.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="120">
+          <caret line="16" lean-forward="true" selection-start-line="16" selection-end-line="16" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/de/dmi3y/behaiv/tools/Pair.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="495">
+          <caret line="39" column="36" selection-start-line="39" selection-start-column="36" selection-end-line="39" selection-end-column="36" />
+          <folding>
+            <element signature="e#257#258#0" expanded="true" />
+            <element signature="e#311#312#0" expanded="true" />
+            <element signature="e#847#848#0" expanded="true" />
+            <element signature="e#890#891#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/de/dmi3y/behaiv/tools/PairTest.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="178">
-          <caret line="76" column="56" selection-start-line="76" selection-start-column="56" selection-end-line="76" selection-end-column="56" />
+        <state relative-caret-position="109">
+          <caret line="22" column="61" selection-start-line="22" selection-start-column="61" selection-end-line="22" selection-end-column="61" />
         </state>
       </provider>
     </entry>
@@ -1231,7 +1270,7 @@
       </state>
       <state key="ProjectLibrariesConfigurable.UI">
         <settings>
-          <last-edited>Gradle: com.clearspring.analytics:stream:2.7.0</last-edited>
+          <last-edited>Gradle: com.fasterxml.jackson.core:jackson-annotations:2.9.0</last-edited>
           <splitter-proportions>
             <option name="proportions">
               <list>
diff --git a/build.gradle b/build.gradle
index 4e07227..6827c93 100644
--- a/build.gradle
+++ b/build.gradle
@@ -22,7 +22,7 @@ publishing {
         maven(MavenPublication) {
             groupId = 'de.dmi3y.behaiv'
             artifactId = 'behaiv'
-            version = '0.3.0-alpha'
+            version = '0.3.7-alpha'
 
 
             from components.java
@@ -40,13 +40,13 @@ repositories {
 
 dependencies {
     // This dependency is exported to consumers, that is to say found on their compile classpath.
-    implementation 'org.apache.commons:commons-math3:3.6.1'
-    implementation 'org.apache.commons:commons-lang3:3.9'
 
     // This dependency is used internally, and not exposed to consumers on their own compile classpath.
+    implementation 'org.apache.commons:commons-lang3:3.9'
     implementation 'com.google.guava:guava:28.0-jre'
     implementation 'io.reactivex.rxjava3:rxjava:3.0.0-RC2'
-    implementation 'com.google.code.gson:gson:2.8.5'
+    compile group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.9.9'
+    compile group: 'com.fasterxml.jackson.core', name: 'jackson-core', version: '2.9.9'
 
 
     //ejml (replacement of dl4j)
diff --git a/src/main/java/de/dmi3y/behaiv/Behaiv.java b/src/main/java/de/dmi3y/behaiv/Behaiv.java
index 6cc210e..260ccb0 100644
--- a/src/main/java/de/dmi3y/behaiv/Behaiv.java
+++ b/src/main/java/de/dmi3y/behaiv/Behaiv.java
@@ -9,9 +9,9 @@
 import de.dmi3y.behaiv.provider.ProviderCallback;
 import de.dmi3y.behaiv.session.CaptureSession;
 import de.dmi3y.behaiv.storage.BehaivStorage;
+import de.dmi3y.behaiv.tools.Pair;
 import io.reactivex.rxjava3.core.Observable;
 import io.reactivex.rxjava3.subjects.ReplaySubject;
-import org.apache.commons.math3.util.Pair;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -100,7 +100,7 @@ protected CaptureSession getCurrentSession() {
     @Override
     public void onFeaturesCaptured(List<Pair<Double, String>> features) {
         if (kernel.readyToPredict() && predict) {
-            subject.onNext(kernel.predictOne(features.stream().map(Pair::getFirst).collect(Collectors.toCollection(ArrayList::new))));
+            subject.onNext(kernel.predictOne(features.stream().map(Pair::getKey).collect(Collectors.toCollection(ArrayList::new))));
         }
     }
 
@@ -111,7 +111,7 @@ public void stopCapturing(boolean discard) {
         }
         String label = currentSession.getLabel();
         List<Pair<Double, String>> features = currentSession.getFeatures();
-        kernel.updateSingle(features.stream().map(Pair::getFirst).collect(Collectors.toCollection(ArrayList::new)), label);
+        kernel.updateSingle(features.stream().map(Pair::getKey).collect(Collectors.toCollection(ArrayList::new)), label);
         if (kernel.readyToPredict()) {
             kernel.fit();
         }
diff --git a/src/main/java/de/dmi3y/behaiv/kernel/Kernel.java b/src/main/java/de/dmi3y/behaiv/kernel/Kernel.java
index 192c1ef..8f570f5 100644
--- a/src/main/java/de/dmi3y/behaiv/kernel/Kernel.java
+++ b/src/main/java/de/dmi3y/behaiv/kernel/Kernel.java
@@ -1,8 +1,9 @@
 package de.dmi3y.behaiv.kernel;
 
-import com.google.gson.Gson;
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import de.dmi3y.behaiv.storage.BehaivStorage;
-import org.apache.commons.math3.util.Pair;
+import de.dmi3y.behaiv.tools.Pair;
 
 import java.io.BufferedReader;
 import java.io.BufferedWriter;
@@ -15,9 +16,11 @@ public abstract class Kernel {
 
     protected String id;
     protected Long treshold = 10L;
+    protected ObjectMapper objectMapper;
 
     public Kernel(String id) {
         this.id = id;
+        objectMapper = new ObjectMapper();
     }
 
 
@@ -50,24 +53,28 @@ public void update(ArrayList<Pair<ArrayList<Double>, String>> data) {
     }
 
     public void updateSingle(ArrayList<Double> features, String label) {
-        data.add(Pair.create(features, label));
+        data.add(new Pair<>(features, label));
     }
 
     public abstract String predictOne(ArrayList<Double> features);
 
     public void save(BehaivStorage storage) throws IOException {
-        final Gson gson = new Gson();
 
         try (final BufferedWriter writer = new BufferedWriter(new FileWriter(storage.getNetworkFile(id)))) {
-            writer.write(gson.toJson(data));
+            writer.write(objectMapper.writeValueAsString(data));
         }
     }
 
     public void restore(BehaivStorage storage) throws IOException {
-        final Gson gson = new Gson();
-
+        final TypeReference<ArrayList<Pair<ArrayList<Double>, String>>> typeReference = new TypeReference<ArrayList<Pair<ArrayList<Double>, String>>>() {
+        };
         try (final BufferedReader reader = new BufferedReader(new FileReader(storage.getNetworkFile(id)))) {
-            data = ((ArrayList<Pair<ArrayList<Double>, String>>) gson.fromJson(reader.readLine(), data.getClass()));
+            final String content = reader.readLine();
+            if (content == null || content.isEmpty()) {
+                data = new ArrayList<>();
+            } else {
+                data = objectMapper.readValue(content, typeReference);
+            }
         }
     }
 }
diff --git a/src/main/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernel.java b/src/main/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernel.java
index 72291bc..3594be7 100644
--- a/src/main/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernel.java
+++ b/src/main/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernel.java
@@ -1,10 +1,10 @@
 package de.dmi3y.behaiv.kernel;
 
-import com.google.gson.Gson;
+import com.fasterxml.jackson.core.type.TypeReference;
 import de.dmi3y.behaiv.kernel.logistic.LogisticUtils;
 import de.dmi3y.behaiv.storage.BehaivStorage;
+import de.dmi3y.behaiv.tools.Pair;
 import org.apache.commons.lang3.ArrayUtils;
-import org.apache.commons.math3.util.Pair;
 import org.ejml.simple.SimpleMatrix;
 
 import java.io.BufferedReader;
@@ -41,19 +41,19 @@ public boolean isEmpty() {
     @Override
     public void fit(ArrayList<Pair<ArrayList<Double>, String>> data) {
         this.data = data;
-        labels = this.data.stream().map(Pair::getSecond).distinct().collect(Collectors.toList());
+        labels = this.data.stream().map(Pair::getValue).distinct().collect(Collectors.toList());
         if (readyToPredict()) {
 
 
             //features
-            double[][] inputs = this.data.stream().map(Pair::getFirst).map(l -> l.toArray(new Double[0]))
+            double[][] inputs = this.data.stream().map(Pair::getKey).map(l -> l.toArray(new Double[0]))
                     .map(ArrayUtils::toPrimitive)
                     .toArray(double[][]::new);
 
             //labels
             double[][] labelArray = new double[data.size()][labels.size()];
             for (int i = 0; i < data.size(); i++) {
-                int dummyPos = labels.indexOf(data.get(i).getSecond());
+                int dummyPos = labels.indexOf(data.get(i).getValue());
                 labelArray[i][dummyPos] = 1.0;
             }
 
@@ -107,22 +107,21 @@ public String predictOne(ArrayList<Double> features) {
 
     @Override
     public void save(BehaivStorage storage) throws IOException {
-        if (theta == null && data == null) {
+        if (theta == null && (data == null || data.isEmpty())) {
             throw new IOException("Not enough data to save, network data is empty");
         }
-        if (labels == null) {
+        if (labels == null || labels.isEmpty()) {
             String message;
             message = "Kernel collected labels but failed to get data, couldn't save network.";
             throw new IOException(message);
         }
         if (theta == null) {
             super.save(storage);
-
         } else {
             theta.saveToFileBinary(storage.getNetworkFile(id).toString());
             try (final BufferedWriter writer = new BufferedWriter(new FileWriter(storage.getNetworkMetadataFile(id)))) {
-                final Gson gson = new Gson();
-                writer.write(gson.toJson(labels));
+
+                writer.write(objectMapper.writeValueAsString(labels));
             } catch (Exception e) {
                 e.printStackTrace();
             }
@@ -139,8 +138,14 @@ public void restore(BehaivStorage storage) throws IOException {
         }
 
         try (final BufferedReader reader = new BufferedReader(new FileReader(storage.getNetworkMetadataFile(id)))) {
-            final Gson gson = new Gson();
-            labels = ((List<String>) gson.fromJson(reader.readLine(), labels.getClass()));
+            final TypeReference<ArrayList<String>> typeReference = new TypeReference<ArrayList<String>>() {
+            };
+            final String labelsData = reader.readLine();
+            if (labelsData == null) {
+                labels = new ArrayList<>();
+            } else {
+                labels = objectMapper.readValue(labelsData, typeReference);
+            }
         } catch (IOException e) {
             e.printStackTrace();
         }
diff --git a/src/main/java/de/dmi3y/behaiv/provider/DayTimeProvider.java b/src/main/java/de/dmi3y/behaiv/provider/DayTimeProvider.java
index 2f8ce99..3f47585 100644
--- a/src/main/java/de/dmi3y/behaiv/provider/DayTimeProvider.java
+++ b/src/main/java/de/dmi3y/behaiv/provider/DayTimeProvider.java
@@ -4,6 +4,7 @@
 import io.reactivex.rxjava3.core.Single;
 
 import javax.annotation.Nullable;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Calendar;
 import java.util.Collections;
@@ -45,7 +46,7 @@ public List<String> availableFeatures() {
         if (compound) {
             return Collections.singletonList("day_time");
         }
-        final List<String> strings = Arrays.asList("day_time_hours", "day_time_minutes");
+        final List<String> strings = new ArrayList<>(Arrays.asList("day_time_hours", "day_time_minutes"));
         if (secondsEnabled) {
             strings.add("day_time_seconds");
         }
@@ -64,10 +65,10 @@ public Single<List<Double>> getFeature() {
         if (compound) {
             return Single.just(Collections.singletonList(hours * 60.0 + minutes));
         }
-        final List<Double> listToSend = Arrays.asList(
+        final List<Double> listToSend = new ArrayList<>(Arrays.asList(
                 (double) hours,
                 (double) minutes
-        );
+        ));
         if (secondsEnabled) {
             final int seconds = calendar.get(Calendar.SECOND);
             listToSend.add((double) seconds);
diff --git a/src/main/java/de/dmi3y/behaiv/provider/ProviderCallback.java b/src/main/java/de/dmi3y/behaiv/provider/ProviderCallback.java
index b64634f..465747e 100644
--- a/src/main/java/de/dmi3y/behaiv/provider/ProviderCallback.java
+++ b/src/main/java/de/dmi3y/behaiv/provider/ProviderCallback.java
@@ -1,6 +1,6 @@
 package de.dmi3y.behaiv.provider;
 
-import org.apache.commons.math3.util.Pair;
+import de.dmi3y.behaiv.tools.Pair;
 
 import java.util.List;
 
diff --git a/src/main/java/de/dmi3y/behaiv/session/CaptureSession.java b/src/main/java/de/dmi3y/behaiv/session/CaptureSession.java
index 7c9b75a..930b693 100644
--- a/src/main/java/de/dmi3y/behaiv/session/CaptureSession.java
+++ b/src/main/java/de/dmi3y/behaiv/session/CaptureSession.java
@@ -2,7 +2,7 @@
 
 import de.dmi3y.behaiv.Behaiv;
 import de.dmi3y.behaiv.provider.Provider;
-import org.apache.commons.math3.util.Pair;
+import de.dmi3y.behaiv.tools.Pair;
 
 import java.util.ArrayList;
 import java.util.InputMismatchException;
diff --git a/src/main/java/de/dmi3y/behaiv/tools/Pair.java b/src/main/java/de/dmi3y/behaiv/tools/Pair.java
new file mode 100644
index 0000000..da0fe93
--- /dev/null
+++ b/src/main/java/de/dmi3y/behaiv/tools/Pair.java
@@ -0,0 +1,51 @@
+package de.dmi3y.behaiv.tools;
+
+public class Pair<K, V> {
+    private K key;
+    private V value;
+
+    public Pair(K k, V v) {
+        this.key = k;
+        this.value = v;
+    }
+
+
+    public Pair(de.dmi3y.behaiv.tools.Pair<? extends K, ? extends V> entry) {
+        this(entry.getKey(), entry.getValue());
+    }
+
+    public Pair() {
+    }
+
+    public K getKey() {
+        return this.key;
+    }
+
+    public V getValue() {
+        return this.value;
+    }
+
+    public int hashCode() {
+        int result = this.key == null ? 0 : this.key.hashCode();
+        int h = this.value == null ? 0 : this.value.hashCode();
+        result = 37 * result + h ^ h >>> 16;
+        return result;
+    }
+
+    public String toString() {
+        return "[" + this.getKey() + ", " + this.getValue() + "]";
+    }
+
+    public static <K, V> Pair<K, V> create(K k, V v) {
+        return new Pair<K, V>(k, v);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Pair<?, ?> pair = (Pair<?, ?>) o;
+        return key.equals(pair.key) &&
+                value.equals(pair.value);
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/de/dmi3y/behaiv/LibraryTest.java b/src/test/java/de/dmi3y/behaiv/LibraryTest.java
index 88618d4..69380ad 100644
--- a/src/test/java/de/dmi3y/behaiv/LibraryTest.java
+++ b/src/test/java/de/dmi3y/behaiv/LibraryTest.java
@@ -4,10 +4,9 @@
 package de.dmi3y.behaiv;
 
 import de.dmi3y.behaiv.kernel.KernelTest;
-import de.dmi3y.behaiv.kernel.LogisticRegressionKernel;
 import de.dmi3y.behaiv.provider.TestProvider;
 import io.reactivex.rxjava3.core.Observable;
-import org.apache.commons.math3.util.Pair;
+import de.dmi3y.behaiv.tools.Pair;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -37,10 +36,10 @@ public void setUp() throws Exception {
     @Test
     public void behaivTest_basicTestFlow_predictsJob() throws Exception {
         for (Pair<ArrayList<Double>, String> fToL : data) {
-            ArrayList<Double> features = fToL.getFirst();
+            ArrayList<Double> features = fToL.getKey();
             timeProvider.next(new Double[]{features.get(0)});
             positionProvider.next(new Double[]{features.get(1), features.get(2)});
-            capture(fToL.getSecond());
+            capture(fToL.getValue());
         }
 
         Observable<String> register = behaiv.subscribe();
diff --git a/src/test/java/de/dmi3y/behaiv/kernel/KernelTest.java b/src/test/java/de/dmi3y/behaiv/kernel/KernelTest.java
index 4858be5..f8b0ac4 100644
--- a/src/test/java/de/dmi3y/behaiv/kernel/KernelTest.java
+++ b/src/test/java/de/dmi3y/behaiv/kernel/KernelTest.java
@@ -1,7 +1,7 @@
 package de.dmi3y.behaiv.kernel;
 
 import de.dmi3y.behaiv.storage.SimpleStorage;
-import org.apache.commons.math3.util.Pair;
+import de.dmi3y.behaiv.tools.Pair;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
@@ -39,8 +39,8 @@ public void setUp() throws Exception {
     @Test
     public void setTreshold() {
         dummyKernel.setTreshold(1L);
-        dummyKernel.data.add(Pair.create(null, null));
-        dummyKernel.data.add(Pair.create(null, null));
+        dummyKernel.data.add(new Pair<>(null, null));
+        dummyKernel.data.add(new Pair<>(null, null));
         boolean readyToPredict = dummyKernel.readyToPredict();
         assertTrue(readyToPredict);
         dummyKernel.setTreshold(10L);
diff --git a/src/test/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernelTest.java b/src/test/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernelTest.java
index 73ec12b..6b04096 100644
--- a/src/test/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernelTest.java
+++ b/src/test/java/de/dmi3y/behaiv/kernel/LogisticRegressionKernelTest.java
@@ -1,26 +1,37 @@
 package de.dmi3y.behaiv.kernel;
 
 import de.dmi3y.behaiv.storage.SimpleStorage;
-import org.apache.commons.math3.util.Pair;
+import de.dmi3y.behaiv.tools.Pair;
+import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
 
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Random;
 
 import static de.dmi3y.behaiv.kernel.KernelTest.HOME;
 import static de.dmi3y.behaiv.kernel.KernelTest.WORK;
+import static de.dmi3y.behaiv.kernel.KernelTest.getTrainingData;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
 
 public class LogisticRegressionKernelTest {
 
     @Rule
     public TemporaryFolder testFolder = new TemporaryFolder();
+    private SimpleStorage storage;
 
 
+    @Before
+    public void setUp() throws Exception {
+        storage = new SimpleStorage(testFolder.getRoot());
+    }
+
     @Test
     public void predictOne() {
         ArrayList<Pair<ArrayList<Double>, String>> data = KernelTest.getTrainingData();
@@ -69,15 +80,38 @@ public void storeResults() throws IOException, ClassNotFoundException {
         kernel.restore(storage);
         prediction = kernel.predictOne(predictList);
         assertEquals("WORK_SCREEN", prediction);
+    }
 
+    @Test
+    public void storeResults_saveWhenDataIsNull_expectException() throws IOException, ClassNotFoundException {
+        LogisticRegressionKernel kernel = new LogisticRegressionKernel("storeTest");
+        try {
+            kernel.save(storage);
+            fail();
+        } catch (IOException e) {
+            assertEquals(e.getMessage(), "Not enough data to save, network data is empty");
+        }
+    }
 
+    @Test
+    public void storeResults_saveWhenLabelsIsNull_expectException() throws IOException, ClassNotFoundException {
+        LogisticRegressionKernel kernel = new LogisticRegressionKernel("storeTest");
+        kernel.data = getTrainingData();
+        try {
+            kernel.save(storage);
+            fail();
+        } catch (IOException e) {
+            assertEquals(e.getMessage(), "Kernel collected labels but failed to get data, couldn't save network.");
+        }
     }
 
+
     @Test
     public void storeResults_saveDataAndThenTheta_expectNormalFlow() throws IOException, ClassNotFoundException {
         ArrayList<Pair<ArrayList<Double>, String>> data = KernelTest.getTrainingData();
-        LogisticRegressionKernel kernel = new LogisticRegressionKernel("storeTest");
+        LogisticRegressionKernel kernel = new LogisticRegressionKernel("storeTest", new Random());
         kernel.data = data;
+        kernel.labels = Arrays.asList("time", "lat", "lon", "headphones");
         //Omit fit
 //        kernel.fit(data);
         ArrayList<Double> predictList = new ArrayList<>();
@@ -87,13 +121,13 @@ public void storeResults_saveDataAndThenTheta_expectNormalFlow() throws IOExcept
         predictList.add(1.0);
 
 
-        final SimpleStorage storage = new SimpleStorage(testFolder.getRoot());
         kernel.save(storage); //Saving data this time
 
         kernel = new LogisticRegressionKernel("storeTest");
         kernel.restore(storage);
 
         assertFalse(kernel.data.isEmpty());
+        kernel.data.get(0).getKey();
         kernel.fit(data);
 
         String prediction = kernel.predictOne(predictList);
diff --git a/src/test/java/de/dmi3y/behaiv/provider/DayTimeProviderTest.java b/src/test/java/de/dmi3y/behaiv/provider/DayTimeProviderTest.java
index e2dc68b..41b1b3c 100644
--- a/src/test/java/de/dmi3y/behaiv/provider/DayTimeProviderTest.java
+++ b/src/test/java/de/dmi3y/behaiv/provider/DayTimeProviderTest.java
@@ -18,11 +18,19 @@ public class DayTimeProviderTest {
     @Before
     public void setUp() throws Exception {
         calendar = mock(Calendar.class);
-        timeProvider = new DayTimeProvider(calendar, true, false);
+        timeProvider = new DayTimeProvider(calendar);
     }
 
     @Test
-    public void getFeature() {
+    public void constructors_shouldInit() {
+        timeProvider = new DayTimeProvider();
+        timeProvider = new DayTimeProvider(Calendar.getInstance());
+        timeProvider = new DayTimeProvider(true, true);
+        timeProvider = new DayTimeProvider(Calendar.getInstance(), true, true);
+    }
+
+    @Test
+    public void getFeatureCompound() {
         assertEquals(1, timeProvider.availableFeatures().size());
         assertEquals("day_time", timeProvider.availableFeatures().get(0));
         when(calendar.get(Calendar.HOUR_OF_DAY)).thenReturn(10);
@@ -31,7 +39,24 @@ public void getFeature() {
 
         assertEquals(1, result.size());
         assertEquals(10 * 60.0 + 30, result.get(0));
+    }
 
+    @Test
+    public void getFeatureAll() {
+        timeProvider = new DayTimeProvider(calendar, false, true);
+        assertEquals(3, timeProvider.availableFeatures().size());
+        assertEquals("day_time_hours", timeProvider.availableFeatures().get(0));
+        assertEquals("day_time_minutes", timeProvider.availableFeatures().get(1));
+        assertEquals("day_time_seconds", timeProvider.availableFeatures().get(2));
+        when(calendar.get(Calendar.HOUR_OF_DAY)).thenReturn(10);
+        when(calendar.get(Calendar.MINUTE)).thenReturn(30);
+        when(calendar.get(Calendar.SECOND)).thenReturn(25);
+        final List<Double> result = timeProvider.getFeature().blockingGet();
 
+        assertEquals(3, result.size());
+        assertEquals(10.0, result.get(0));
+        assertEquals(30.0, result.get(1));
+        assertEquals(25.0, result.get(2));
     }
+
 }
\ No newline at end of file
diff --git a/src/test/java/de/dmi3y/behaiv/tools/PairTest.java b/src/test/java/de/dmi3y/behaiv/tools/PairTest.java
new file mode 100644
index 0000000..a2815b4
--- /dev/null
+++ b/src/test/java/de/dmi3y/behaiv/tools/PairTest.java
@@ -0,0 +1,46 @@
+package de.dmi3y.behaiv.tools;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class PairTest {
+
+    @Before
+    public void setUp() throws Exception {
+    }
+
+    @Test
+    public void getKey() {
+        final Pair<String, String> stringStringPair = new Pair<>("KeyTest", "ValueTest");
+        assertEquals("KeyTest", stringStringPair.getKey());
+    }
+
+    @Test
+    public void getValue() {
+        final Pair<String, String> stringStringPair = new Pair<>("KeyTest", "ValueTest");
+        assertEquals("ValueTest", stringStringPair.getValue());
+    }
+
+    @Test
+    public void hashCode1() {
+        final Pair<String, String> stringStringPair = new Pair<>("KeyTest", "ValueTest");
+        final int hash = stringStringPair.hashCode();
+        final int expectedHash = 37 * "KeyTest".hashCode() + "ValueTest".hashCode() ^ "ValueTest".hashCode() >>> 16;
+        assertEquals(expectedHash, hash);
+    }
+
+    @Test
+    public void toString1() {
+        final Pair<String, String> stringStringPair = new Pair<>("KeyTest", "ValueTest");
+        assertEquals("[KeyTest, ValueTest]", stringStringPair.toString());
+    }
+
+    @Test
+    public void create() {
+        final Pair<String, String> pair = Pair.create("KeyTest", "ValueTest");
+        assertEquals("KeyTest", pair.getKey());
+        assertEquals("ValueTest", pair.getValue());
+    }
+}
\ No newline at end of file