Which attribute replace for “layout_constraintGuide_Percent” at Android-Studio

I used constraint layout Android Studio 2.3.1 with "constraint-layout:1.0.0-alpha4" dependency before, but now i am using 'com.android.support.constraint:constraint-layout:1.0.2', "layout_constraintGuide_Percent" attribute is not exists. Which attribute replace for "layout_constraintGuide_Percent"?

my code:

<android.support.constraint.Guideline
    android:id="@+id/guideline_vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    app:layout_constraintGuide_Percent="0.8"
    tools:layout_editor_absoluteX="50dp"
    tools:layout_editor_absoluteY="0dp" />

from Which attribute replace for “layout_constraintGuide_Percent” at Android-Studio