1 files changed, 75 insertions, 0 deletions
diff --git a/compiler/nnc/passes/transformations/LowerConv2D.cpp b/compiler/nnc/passes/transformations/LowerConv2D.cpp
new file mode 100644
index 000000000..9e32978bc
--- /dev/null
+++ b/compiler/nnc/passes/transformations/LowerConv2D.cpp
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ */
+
+#include "passes/transformations/LowerConv2D.h"
+
+#include "mir/ops/Conv2DOp.h"
+#include "mir/ops/DepthwiseConv2DOp.h"
+#include "mir/ops/TransposeOp.h"
+
+namespace nnc
+{
+
+static void lowerConv2D(mir::Graph *graph, mir::ops::Conv2DOp *op)
+{
+  mir::Operation::Output *input = op->getInput(0);
+  mir::Operation::Output *kernel = op->getInput(1);
+
+  const std::int32_t in_group_size = kernel->getShape().dim(3);
+  const std::int32_t out_group_size = kernel->getShape().dim(0) / op->getNumGroups();
+
+  if (in_group_size == 1 && out_group_size == 1)
+  {
+    // [O, H, W, I / M] == [M, H, W, 1] -> [H, W, M, 1]
+    std::vector<std::size_t> perm{1, 2, 0, 3};
+    mir::Operation::Output *new_kernel =
+        graph->create<mir::ops::TransposeOp>(kernel, perm)->getOutput(0);
+    mir::Conv2DOpAttributes attributes = op->getAttributes();
+    attributes.num_groups = 1;
+    mir::Operation::Output *new_result =
+        graph->create<mir::ops::DepthwiseConv2DOp>(input, new_kernel, attributes)->getOutput(0);
+    graph->replaceNode(op, new_result->getNode());
+  }
+}
+
+LowerConv2D::LowerConv2D() = default;
+
+PassData LowerConv2D::run(PassData data)
+{
+  auto *graph = static_cast<mir::Graph *>(data);
+
+  // Collect candidate ops before actual transformation because the graph will be changed.
+  std::vector<mir::ops::Conv2DOp *> group_conv_ops;
+  for (mir::Operation *op : graph->getNodes())
+  {
+    auto *conv_op = dynamic_cast<mir::ops::Conv2DOp *>(op);
+    if (conv_op != nullptr && conv_op->getNumGroups() != 1)
+    {
+      group_conv_ops.push_back(conv_op);
+    }
+  }
+
+  for (mir::ops::Conv2DOp *op : group_conv_ops)
+  {
+    lowerConv2D(graph, op);
+  }
+
+  return graph;
+}
+
+void LowerConv2D::cleanup() {}
+
+} // namespace nnc