1 files changed, 134 insertions, 0 deletions
diff --git a/compiler/enco/frontend/caffe/src/Layer/Eltwise.cpp b/compiler/enco/frontend/caffe/src/Layer/Eltwise.cpp
new file mode 100644
index 000000000..6a5d4f196
--- /dev/null
+++ b/compiler/enco/frontend/caffe/src/Layer/Eltwise.cpp
@@ -0,0 +1,134 @@
+/*
+ * Copyright (c) 2018 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 "Eltwise.h"
+#include "IRBuilder.h"
+
+#include <coco/IR/FeatureLayouts.h>
+
+#include <morph/caffe.h>
+
+#include <cassert>
+#include <functional>
+
+using namespace nncc::core::ADT;
+using namespace morph::caffe;
+
+namespace caffeimport
+{
+
+void EltwiseBuilder::build(const ::caffe::LayerParameter &layer, GraphBuilderContext *context) const
+{
+  coco::Module *module = context->module();
+  coco::Block *blk = context->block();
+  std::map<std::string, tensor::Shape> &shape_ctx = context->shape_ctx();
+  std::map<std::string, coco::Bag *> &bag_ctx = context->bag_ctx();
+
+  using coco::FeatureLayouts::BCHW;
+
+  assert(layer.bottom().size() > 1);
+  assert(layer.top().size() == 1);
+
+  assert(layer.has_eltwise_param());
+  const auto &param = layer.eltwise_param();
+
+  using ::caffe::EltwiseParameter_EltwiseOp;
+  using ::caffe::EltwiseParameter_EltwiseOp_SUM;
+  using ::caffe::EltwiseParameter_EltwiseOp_PROD;
+
+  using Reducer = std::function<coco::Op *(coco::Op * lhs, coco::Op * rhs)>;
+  using ReducerRegistry = std::map<EltwiseParameter_EltwiseOp, Reducer>;
+
+  ReducerRegistry registry;
+
+  // MAX are not supported, yet
+  registry[EltwiseParameter_EltwiseOp_SUM] = [](coco::Op *lhs, coco::Op *rhs) -> coco::Op * {
+    if (lhs == nullptr)
+    {
+      assert(rhs != nullptr);
+      return rhs;
+    }
+
+    assert(lhs != nullptr && rhs != nullptr);
+    assert(lhs->module() == rhs->module());
+    assert(lhs->module() != nullptr);
+
+    auto m = lhs->module();
+    return op_builder(m).push(rhs).push(lhs).add().pop();
+  };
+
+  registry[EltwiseParameter_EltwiseOp_PROD] = [](coco::Op *lhs, coco::Op *rhs) -> coco::Op * {
+    if (lhs == nullptr)
+    {
+      assert(rhs != nullptr);
+      return rhs;
+    }
+
+    assert(lhs != nullptr && rhs != nullptr);
+    assert(lhs->module() == rhs->module());
+    assert(lhs->module() != nullptr);
+
+    auto m = lhs->module();
+    return op_builder(m).push(rhs).push(lhs).mul().pop();
+  };
+
+  // coeff is not supported, yet
+  assert(!param.coeff().size());
+
+  // Decide appropriate reduce function
+  auto reduce = registry.at(param.operation());
+
+  coco::Op *op = nullptr;
+
+  for (const auto &ifm_name : layer.bottom())
+  {
+    auto ifm_shape = shape_ctx.at(ifm_name);
+
+    // NOTE The current implementation does not work in general
+    auto ifm_bag = bag_ctx.at(ifm_name);
+    auto ifm_obj = module->entity()->object()->create<coco::FeatureObject>();
+
+    ifm_obj->bag(ifm_bag);
+    ifm_obj->layout(BCHW::create(as_feature_shape(ifm_shape)));
+
+    auto load = op_builder(module).load(ifm_obj).pop();
+
+    op = reduce(op, load);
+  }
+
+  assert(op != nullptr);
+
+  const auto ofm_name = layer.top(0);
+  const auto ofm_shape = shape_ctx.at(layer.bottom(0));
+
+  auto ofm_bag = module->entity()->bag()->create(num_elements(ofm_shape));
+  auto ofm_obj = module->entity()->object()->create<coco::FeatureObject>();
+
+  ofm_obj->bag(ofm_bag);
+  ofm_obj->layout(BCHW::create(as_feature_shape(ofm_shape)));
+
+  // Create "Eval" instruction
+  auto eval = instr_builder(module).eval(ofm_obj, op);
+
+  // Append the instruction to the block
+  blk->instr()->append(eval);
+
+  // Update bag and shape context
+  bag_ctx[ofm_name] = ofm_bag;
+  shape_ctx[ofm_name] = ofm_shape;
+}
+
+} // namespace caffeimport