argMax to core

kmath-tensors/src/commonMain/kotlin/space/kscience/kmath/tensors/api/TensorAlgebra.kt

@@ -312,16 +312,4 @@ public interface TensorAlgebra<T> : Algebra<Tensor<T>> {
      */
     public fun Tensor<T>.max(dim: Int, keepDim: Boolean): Tensor<T>
 
-    /**
-     * Returns the index of maximum value of each row of the input tensor in the given dimension [dim].
-     *
-     * If [keepDim] is true, the output tensor is of the same size as
-     * input except in the dimension [dim] where it is of size 1.
-     * Otherwise, [dim] is squeezed, resulting in the output tensor having 1 fewer dimension.
-     *
-     * @param dim the dimension to reduce.
-     * @param keepDim whether the output tensor has [dim] retained or not.
-     * @return the the index of maximum value of each row of the input tensor in the given dimension [dim].
-     */
-    public fun Tensor<T>.argMax(dim: Int, keepDim: Boolean): Tensor<T>
 }

kmath-tensors/src/commonMain/kotlin/space/kscience/kmath/tensors/core/DoubleTensorAlgebra.kt

@@ -576,7 +576,19 @@ public open class DoubleTensorAlgebra :
     override fun Tensor<Double>.max(dim: Int, keepDim: Boolean): DoubleTensor =
         foldDim({ x -> x.maxOrNull()!! }, dim, keepDim)
 
-    override fun Tensor<Double>.argMax(dim: Int, keepDim: Boolean): DoubleTensor =
+
+    /**
+     * Returns the index of maximum value of each row of the input tensor in the given dimension [dim].
+     *
+     * If [keepDim] is true, the output tensor is of the same size as
+     * input except in the dimension [dim] where it is of size 1.
+     * Otherwise, [dim] is squeezed, resulting in the output tensor having 1 fewer dimension.
+     *
+     * @param dim the dimension to reduce.
+     * @param keepDim whether the output tensor has [dim] retained or not.
+     * @return the the index of maximum value of each row of the input tensor in the given dimension [dim].
+     */
+    public fun Tensor<Double>.argMax(dim: Int, keepDim: Boolean): DoubleTensor =
         foldDim({ x ->
             x.withIndex().maxByOrNull { it.value }?.index!!.toDouble()
         }, dim, keepDim)