Use Logback for logging when running benchmark

Author: Atry

benchmarks/build.sbt

@@ -6,6 +6,8 @@ val nd4jRuntime = settingKey[String]("\"cuda-8.0\" to run benchmark on GPU, \"na
 
 nd4jRuntime in Global := "native"
 
+libraryDependencies += "ch.qos.logback" % "logback-classic" % "1.2.3"
+
 libraryDependencies += "org.nd4j" % s"nd4j-${nd4jRuntime.value}-platform" % "0.8.0"
 
 libraryDependencies += ("org.lwjgl" % "lwjgl" % "3.1.6").jar().classifier {