chore: import upstream snapshot with attribution

2026-07-13 12:47:05 +08:00
commit 4f3b7da785
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+/* ******************************************************************************
+ *
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0.
+ *
+ *  See the NOTICE file distributed with this work for additional
+ *  information regarding copyright ownership.
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ******************************************************************************/
+
+//
+// @author Yurii Shyrma (iuriish@yahoo.com)
+//
+
+#ifndef LIBND4J_FULLPIVLU_H
+#define LIBND4J_FULLPIVLU_H
+#include <array/NDArray.h>
+
+namespace sd {
+namespace ops {
+namespace helpers {
+
+// class solves equation A*x = b for x, by procedure of LU decomposition of input matrix A with complete pivoting
+// LU decomposition of a matrix is:
+// A = P^-1 * L * U * Q^-1
+// L is unit-lower-triangular,
+// U is upper-triangular,
+// and P and Q are permutation matrices for rows and columns correspondingly
+
+template <typename T>
+class FullPivLU {
+ public:
+  // A{M,K} * x{K,N} = b{M,N}
+  static void solve(NDArray &A, NDArray &b, NDArray& x);
+};
+
+}  // namespace helpers
+}  // namespace ops
+}  // namespace sd
+
+#endif  // LIBND4J_FULLPIVLU_H