chore: import upstream snapshot with attribution

libnd4j/include/ops/declarable/generic/linalg/diag.cpp

@@ -0,0 +1,62 @@
+/* ******************************************************************************
+ *
+ *
+ * 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), created on 06.12.2017
+//
+
+#include <system/op_boilerplate.h>
+#if NOT_EXCLUDED(OP_diag)
+
+#include <ops/declarable/CustomOperations.h>
+#include <ops/declarable/helpers/diag.h>
+
+namespace sd {
+namespace ops {
+
+//////////////////////////////////////////////////////////////////////////
+CUSTOM_OP_IMPL(diag, 1, 1, false, 0, 0) {
+  auto input = INPUT_VARIABLE(0);
+  auto output = OUTPUT_VARIABLE(0);
+
+  // input validation
+  REQUIRE_TRUE(input->rankOf() <= 3, 0, "CUSTOM_OP diag: rank of input array must be <= 3 !, but got %i instead",
+               input->rankOf());
+  int zero = 0;
+  output->assign(zero);
+
+  helpers::diagFunctor(block.launchContext(), input, output);
+
+  return Status::OK;
+}
+
+DECLARE_SYN(MatrixDiag, diag);
+
+DECLARE_TYPES(diag) { getOpDescriptor()->setAllowedInputTypes(ANY)->setSameMode(true); }
+
+//////////////////////////////////////////////////////////////////////////
+DECLARE_SHAPE_FN(diag) {
+  LongType* inputShapeInfo = inputShape->at(0);
+
+  return SHAPELIST(ShapeUtils::evalDiagShapeInfo(inputShapeInfo, block.workspace()));
+}
+
+}  // namespace ops
+}  // namespace sd
+
+#endif