Improved stability for benchmarks and merge from dev

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

kmath-torch/build.gradle.kts

@@ -119,6 +119,8 @@ kotlin {
                     "-Wl,-rpath=$cppBuildDir",
                     "-lctorch"
                 )
+                optimized = true
+                debuggable = false
             }
         }
     }

kmath-torch/src/nativeTest/kotlin/kscience/kmath/torch/BenchmarkMatrixMultiplicationDouble.kt

@@ -5,6 +5,7 @@ import kotlin.time.measureTime
 
 internal fun benchmarkingDoubleMatrixMultiplication(
     scale: Int,
+    numWarmUp: Int,
     numIter: Int,
     device: TorchDevice = TorchDevice.TorchCPU
 ): Unit {
@@ -13,20 +14,21 @@ internal fun benchmarkingDoubleMatrixMultiplication(
         setSeed(SEED)
         val lhs = randNormal(shape = intArrayOf(scale, scale), device = device)
         val rhs = randNormal(shape = intArrayOf(scale, scale), device = device)
-        lhs dotAssign rhs
+        repeat(numWarmUp) { lhs dotAssign rhs }
         val measuredTime = measureTime { repeat(numIter) { lhs dotAssign rhs } }
         println("   ${measuredTime / numIter} p.o. with $numIter iterations")
     }
 }
 
-class BenchmarksDouble {
+class BenchmarkMatrixMultiplicationDouble {
 
     @Test
-    fun benchmarkMatrixMultiplication20() = benchmarkingDoubleMatrixMultiplication(20, 100000)
-    @Test
-    fun benchmarkMatrixMultiplication200() = benchmarkingDoubleMatrixMultiplication(200, 10000)
-    @Test
-    fun benchmarkMatrixMultiplication2000() = benchmarkingDoubleMatrixMultiplication(2000, 10)
+    fun benchmarkMatrixMultiplication20() = benchmarkingDoubleMatrixMultiplication(20, 10, 100000)
 
+    @Test
+    fun benchmarkMatrixMultiplication200() = benchmarkingDoubleMatrixMultiplication(200, 10, 10000)
+
+    @Test
+    fun benchmarkMatrixMultiplication2000() = benchmarkingDoubleMatrixMultiplication(2000, 3, 20)
 
 }