COMPMID-1603: Add PadLayer to graph API

Change-Id: Ic985ac8b0b09c3a6b3f2d43274af8ce89f8c90dd
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/150313
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: bsgcomp <bsgcomp@arm.com>

9 files changed, 162 insertions, 0 deletions

diff --git a/arm_compute/graph/GraphBuilder.h b/arm_compute/graph/GraphBuilder.h
index 1302d2a2b3..2170cd19b6 100644
--- a/arm_compute/graph/GraphBuilder.h
+++ b/arm_compute/graph/GraphBuilder.h
@@ -251,6 +251,17 @@ public:
      */
     static NodeID add_normalize_planar_yuv_node(Graph &g, NodeParams params, NodeIdxPair input,
                                                 ITensorAccessorUPtr mean_accessor = nullptr, ITensorAccessorUPtr std_accessor = nullptr);
+    /** Adds a pad layer node to the graph
+     *
+     * @param[in] g       Graph to add the node to
+     * @param[in] params  Common node parameters
+     * @param[in] input   Input to the reshape layer node as a NodeID-Index pair
+     * @param[in] padding The padding for each spatial dimension of the input tensor. The pair padding[i]
+     *                    specifies the front and the end padding in the i-th dimension.
+     *
+     * @return Node ID of the created node, EmptyNodeID in case of error
+     */
+    static NodeID add_pad_node(Graph &g, NodeParams params, NodeIdxPair input, PaddingList padding);
     /** Adds a permute layer node to the graph
      *
      * @param[in] g      Graph to add the node to
diff --git a/arm_compute/graph/TypePrinter.h b/arm_compute/graph/TypePrinter.h
index b0d0fb0242..9cdd7b7773 100644
--- a/arm_compute/graph/TypePrinter.h
+++ b/arm_compute/graph/TypePrinter.h
@@ -98,6 +98,9 @@ inline ::std::ostream &operator<<(::std::ostream &os, const NodeType &node_type)
         case NodeType::NormalizePlanarYUVLayer:
             os << "NormalizePlanarYUVLayer";
             break;
+        case NodeType::PadLayer:
+            os << "PadLayer";
+            break;
         case NodeType::PermuteLayer:
             os << "PermuteLayer";
             break;
diff --git a/arm_compute/graph/Types.h b/arm_compute/graph/Types.h
index 1f252097af..a1b077a849 100644
--- a/arm_compute/graph/Types.h
+++ b/arm_compute/graph/Types.h
@@ -142,6 +142,7 @@ enum class NodeType
     FullyConnectedLayer,
     NormalizationLayer,
     NormalizePlanarYUVLayer,
+    PadLayer,
     PermuteLayer,
     PoolingLayer,
     ReorgLayer,
diff --git a/arm_compute/graph/backends/FunctionHelpers.h b/arm_compute/graph/backends/FunctionHelpers.h
index 32ef0aaf13..56f4173fa0 100644
--- a/arm_compute/graph/backends/FunctionHelpers.h
+++ b/arm_compute/graph/backends/FunctionHelpers.h
@@ -659,6 +659,42 @@ std::unique_ptr<IFunction> create_normalize_planar_yuv_layer(NormalizePlanarYUVL
     return std::move(func);
 }
 
+/** Create a backend pad layer function
+ *
+ * @tparam PadLayerFunction Backend pad function
+ * @tparam TargetInfo       Target-specific information
+ *
+ * @param[in] node Node to create the backend function for
+ *
+ * @return Backend pad layer function
+ */
+template <typename PadLayerFunction, typename TargetInfo>
+std::unique_ptr<IFunction> create_pad_layer(PadLayerNode &node)
+{
+    validate_node<TargetInfo>(node, 1 /* expected inputs */, 1 /* expected outputs */);
+
+    // Extract IO and info
+    typename TargetInfo::TensorType *input   = get_backing_tensor<TargetInfo>(node.input(0));
+    typename TargetInfo::TensorType *output  = get_backing_tensor<TargetInfo>(node.output(0));
+    const PaddingList               &padding = node.padding();
+    ARM_COMPUTE_ERROR_ON(input == nullptr);
+    ARM_COMPUTE_ERROR_ON(output == nullptr);
+
+    // Create and configure function
+    auto func = support::cpp14::make_unique<PadLayerFunction>();
+    func->configure(input, output, padding);
+
+    // Log info
+    ARM_COMPUTE_LOG_GRAPH_INFO("Instantiated " << node.type()
+                               << " Target " << TargetInfo::TargetType
+                               << " Data Type: " << input->info()->data_type()
+                               << " Input shape: " << input->info()->tensor_shape()
+                               << " Output shape: " << output->info()->tensor_shape()
+                               << std::endl);
+
+    return std::move(func);
+}
+
 /** Create a backend permute layer function
  *
  * @tparam PermuteLayerFunction Backend permute function
diff --git a/arm_compute/graph/backends/ValidateHelpers.h b/arm_compute/graph/backends/ValidateHelpers.h
index ff644c4946..b0395da0bc 100644
--- a/arm_compute/graph/backends/ValidateHelpers.h
+++ b/arm_compute/graph/backends/ValidateHelpers.h
@@ -203,6 +203,30 @@ Status validate_normalize_planar_yuv_layer(NormalizePlanarYUVLayerNode &node)
     // Validate function
     return NormalizePlanarYUVLayer::validate(input, output, mean, std);
 }
+
+/** Validates a pad layer node
+ *
+ * @tparam PadLayer Pad layer type
+ *
+ * @param[in] node Node to validate
+ *
+ * @return Status
+ */
+template <typename PadLayer>
+Status validate_pad_layer(PadLayerNode &node)
+{
+    ARM_COMPUTE_LOG_GRAPH_VERBOSE("Validating PadLayer node with ID : " << node.id() << " and Name: " << node.name() << std::endl);
+    ARM_COMPUTE_RETURN_ERROR_ON(node.num_inputs() != 1);
+    ARM_COMPUTE_RETURN_ERROR_ON(node.num_outputs() != 1);
+
+    // Extract IO and info
+    arm_compute::ITensorInfo *input   = get_backing_tensor_info(node.input(0));
+    arm_compute::ITensorInfo *output  = get_backing_tensor_info(node.output(0));
+    const PaddingList        &padding = node.padding();
+
+    return PadLayer::validate(input, output, padding);
+}
+
 /** Validates a permute layer node
  *
  * @tparam PermuteLayer Permute layer type
diff --git a/arm_compute/graph/frontend/Layers.h b/arm_compute/graph/frontend/Layers.h
index 9c1ef1e140..d72f549cf9 100644
--- a/arm_compute/graph/frontend/Layers.h
+++ b/arm_compute/graph/frontend/Layers.h
@@ -569,6 +569,31 @@ private:
     ITensorAccessorUPtr _std;
 };
 
+/** Pad Layer */
+class PadLayer final : public ILayer
+{
+public:
+    /** Construct a pad layer.
+     *
+     * @param[in] padding The padding for each spatial dimension of the input tensor. The pair padding[i]
+     *                    specifies the front and the end padding in the i-th dimension.
+     */
+    PadLayer(PaddingList padding)
+        : _padding(padding)
+    {
+    }
+
+    NodeID create_layer(IStream &s) override
+    {
+        NodeParams  common_params = { name(), s.hints().target_hint };
+        NodeIdxPair input         = { s.tail_node(), 0 };
+        return GraphBuilder::add_pad_node(s.graph(), common_params, input, _padding);
+    }
+
+private:
+    PaddingList _padding;
+};
+
 /** Permute Layer */
 class PermuteLayer final : public ILayer
 {
diff --git a/arm_compute/graph/nodes/Nodes.h b/arm_compute/graph/nodes/Nodes.h
index 2bda7e01ba..4e2a49db9b 100644
--- a/arm_compute/graph/nodes/Nodes.h
+++ b/arm_compute/graph/nodes/Nodes.h
@@ -40,6 +40,7 @@
 #include "arm_compute/graph/nodes/NormalizationLayerNode.h"
 #include "arm_compute/graph/nodes/NormalizePlanarYUVLayerNode.h"
 #include "arm_compute/graph/nodes/OutputNode.h"
+#include "arm_compute/graph/nodes/PadLayerNode.h"
 #include "arm_compute/graph/nodes/PermuteLayerNode.h"
 #include "arm_compute/graph/nodes/PoolingLayerNode.h"
 #include "arm_compute/graph/nodes/ReorgLayerNode.h"
diff --git a/arm_compute/graph/nodes/NodesFwd.h b/arm_compute/graph/nodes/NodesFwd.h
index ae5ed7c405..7aed471215 100644
--- a/arm_compute/graph/nodes/NodesFwd.h
+++ b/arm_compute/graph/nodes/NodesFwd.h
@@ -46,6 +46,7 @@ class InputNode;
 class NormalizationLayerNode;
 class NormalizePlanarYUVLayerNode;
 class OutputNode;
+class PadLayerNode;
 class PermuteLayerNode;
 class PoolingLayerNode;
 class ReorgLayerNode;
diff --git a/arm_compute/graph/nodes/PadLayerNode.h b/arm_compute/graph/nodes/PadLayerNode.h
new file mode 100644
index 0000000000..a14be0232f
--- /dev/null
+++ b/arm_compute/graph/nodes/PadLayerNode.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_GRAPH_PAD_LAYER_NODE_H__
+#define __ARM_COMPUTE_GRAPH_PAD_LAYER_NODE_H__
+
+#include "arm_compute/graph/INode.h"
+
+namespace arm_compute
+{
+namespace graph
+{
+/** Pad Layer node */
+class PadLayerNode final : public INode
+{
+public:
+    /** Constructor
+     *
+     * @param[in] padding The padding for each spatial dimension of the input tensor. The pair padding[i]
+     *                    specifies the front and the end padding in the i-th dimension.
+     */
+    PadLayerNode(PaddingList &padding);
+    /** Padding list accessor
+     *
+     * @return Padding list
+     */
+    const PaddingList &padding() const;
+
+    // Inherited overridden methods:
+    NodeType         type() const override;
+    bool             forward_descriptors() override;
+    TensorDescriptor configure_output(size_t idx) const override;
+    void accept(INodeVisitor &v) override;
+
+private:
+    PaddingList _padding;
+};
+} // namespace graph
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_GRAPH_PAD_LAYER_NODE_H__ */