diff --git a/src/Phpml/SupportVectorMachine/DataTransformer.php b/src/Phpml/SupportVectorMachine/DataTransformer.php
index 4e01fc8..5b418e2 100644
--- a/src/Phpml/SupportVectorMachine/DataTransformer.php
+++ b/src/Phpml/SupportVectorMachine/DataTransformer.php
@@ -51,7 +51,7 @@ class DataTransformer
     {
         $row = [];
         foreach ($sample as $index => $feature) {
-            $row[] = sprintf('%s:%s', $index, $feature);
+            $row[] = sprintf('%s:%s', $index + 1, $feature);
         }
 
         return implode(' ', $row);
diff --git a/src/Phpml/SupportVectorMachine/SupportVectorMachine.php b/src/Phpml/SupportVectorMachine/SupportVectorMachine.php
index 6e2be20..6842777 100644
--- a/src/Phpml/SupportVectorMachine/SupportVectorMachine.php
+++ b/src/Phpml/SupportVectorMachine/SupportVectorMachine.php
@@ -27,7 +27,7 @@ class SupportVectorMachine
     private $binPath;
 
     /**
-     * @var
+     * @var string
      */
     private $varPath;
 
@@ -80,4 +80,8 @@ class SupportVectorMachine
     {
         return $this->model;
     }
+
+    public function predict(array $samples)
+    {
+    }
 }
diff --git a/tests/Phpml/SupportVectorMachine/DataTransformerTest.php b/tests/Phpml/SupportVectorMachine/DataTransformerTest.php
index 84fd001..1429511 100644
--- a/tests/Phpml/SupportVectorMachine/DataTransformerTest.php
+++ b/tests/Phpml/SupportVectorMachine/DataTransformerTest.php
@@ -14,10 +14,10 @@ class DataTransformerTest extends \PHPUnit_Framework_TestCase
         $labels = ['a', 'a', 'b', 'b'];
 
         $trainingSet =
-            '0 0:1 1:1 '.PHP_EOL.
-            '0 0:2 1:1 '.PHP_EOL.
-            '1 0:3 1:2 '.PHP_EOL.
-            '1 0:4 1:5 '.PHP_EOL
+            '0 1:1 2:1 '.PHP_EOL.
+            '0 1:2 2:1 '.PHP_EOL.
+            '1 1:3 2:2 '.PHP_EOL.
+            '1 1:4 2:5 '.PHP_EOL
         ;
 
         $this->assertEquals($trainingSet, DataTransformer::trainingSet($samples, $labels));
diff --git a/tests/Phpml/SupportVectorMachine/SupportVectorMachineTest.php b/tests/Phpml/SupportVectorMachine/SupportVectorMachineTest.php
index e06f715..e4a8857 100644
--- a/tests/Phpml/SupportVectorMachine/SupportVectorMachineTest.php
+++ b/tests/Phpml/SupportVectorMachine/SupportVectorMachineTest.php
@@ -24,8 +24,8 @@ rho 0
 label 0 1
 nr_sv 1 1
 SV
-0.25 0:2 1:4 
--0.25 0:4 1:2 
+0.25 1:2 2:4 
+-0.25 1:4 2:2 
 ';
 
         $svm = new SupportVectorMachine(Type::C_SVC, Kernel::LINEAR, 100.0);