Fuse pad layer with subsequent convolution layer

Fusing occurs only if
  - the padding is only for height/width
  - padding pixel value is 0
  - padding node output has no accessors

Resolves: COMPMID-4702

Signed-off-by: Gunes Bayir <gunes.bayir@arm.com>
Change-Id: I0755d5fb0bd3a55d9f10b32ce9da44e7c5a25279
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/6189
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Pablo Marquez Tello <pablo.tello@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Comments-Addressed: Georgios Pinitas <georgios.pinitas@arm.com>

4 files changed, 23 insertions, 3 deletions

diff --git a/arm_compute/graph/Utils.h b/arm_compute/graph/Utils.h
index 43a8eca9e3..a3d9012ee9 100644
--- a/arm_compute/graph/Utils.h
+++ b/arm_compute/graph/Utils.h
@@ -132,6 +132,13 @@ size_t get_dimension_idx(DataLayout data_layout, const DataLayoutDimension data_
  * @return A list with the driving node of a given node
  */
 std::vector<NodeIdxPair> get_driving_nodes(const INode &node);
+/** Get the list of driver nodes of a given node
+ *
+ * @param[in] node Node to find the driver node of
+ *
+ * @return A list with the driver node of a given node
+ */
+std::vector<NodeIdxPair> get_driver_nodes(const INode &node);
 /** Configures tensor
  *
  * @param[in, out] tensor Tensor to configure
diff --git a/arm_compute/graph/nodes/ConvolutionLayerNode.h b/arm_compute/graph/nodes/ConvolutionLayerNode.h
index e4151c0f17..99effa07dc 100644
--- a/arm_compute/graph/nodes/ConvolutionLayerNode.h
+++ b/arm_compute/graph/nodes/ConvolutionLayerNode.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019 Arm Limited.
+ * Copyright (c) 2018-2019, 2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -90,6 +90,11 @@ public:
      * @param[in] fused_activation Fused activation to set
      */
     void set_fused_activation(ActivationLayerInfo fused_activation);
+    /** Sets convolution info
+     *
+     * @param[in] info Convolution info to set
+     */
+    void set_convolution_info(PadStrideInfo info);
     /** Computes convolution output descriptor
      *
      * @param[in] input_descriptor   Input descriptor
diff --git a/arm_compute/graph/nodes/DepthwiseConvolutionLayerNode.h b/arm_compute/graph/nodes/DepthwiseConvolutionLayerNode.h
index 59847a92fc..5df86983f0 100644
--- a/arm_compute/graph/nodes/DepthwiseConvolutionLayerNode.h
+++ b/arm_compute/graph/nodes/DepthwiseConvolutionLayerNode.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019 Arm Limited.
+ * Copyright (c) 2018-2019, 2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -78,6 +78,11 @@ public:
      * @param[in] fused_activation Fused activation to set
      */
     void set_fused_activation(ActivationLayerInfo fused_activation);
+    /** Sets convolution info
+     *
+     * @param[in] info Convolution info to set
+     */
+    void set_convolution_info(PadStrideInfo info);
     /** Computes depthwise convolution output descriptor
      *
      * @param[in] input_descriptor   Input descriptor
diff --git a/arm_compute/graph/nodes/PadLayerNode.h b/arm_compute/graph/nodes/PadLayerNode.h
index 8fcbc52313..d6ff3553da 100644
--- a/arm_compute/graph/nodes/PadLayerNode.h
+++ b/arm_compute/graph/nodes/PadLayerNode.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2020 Arm Limited.
+ * Copyright (c) 2018-2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -58,6 +58,9 @@ public:
     TensorDescriptor configure_output(size_t idx) const override;
     void accept(INodeVisitor &v) override;
 
+public:
+    static constexpr NodeType node_type = NodeType::PadLayer;
+
 private:
     PaddingList _padding;
     PixelValue  _pad_value;