COMPMID-1576: Add SliceLayer to graph API

Change-Id: I42260cc529ca7721e221d3d0576b1668e09f8307
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/148255
Tested-by: bsgcomp <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>

9 files changed, 181 insertions, 1 deletions

diff --git a/arm_compute/graph/GraphBuilder.h b/arm_compute/graph/GraphBuilder.h
index 21c85b5667..3821eb3968 100644
--- a/arm_compute/graph/GraphBuilder.h
+++ b/arm_compute/graph/GraphBuilder.h
@@ -329,6 +329,17 @@ public:
      * @return Node ID of the created node, EmptyNodeID in case of error
      */
     static NodeID add_softmax_node(Graph &g, NodeParams params, NodeIdxPair input, float beta = 1.f);
+    /** Adds a slice 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 slice layer node as a NodeID-Index pair
+     * @param[in] starts The starts of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     * @param[in] ends   The ends of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     *
+     * @return Node ID of the created node, EmptyNodeID in case of error
+     */
+    static NodeID add_slice_node(Graph &g, NodeParams params, NodeIdxPair input, Coordinates &starts, Coordinates &ends);
     /** Adds a split 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 0d111691d3..983400ffe3 100644
--- a/arm_compute/graph/TypePrinter.h
+++ b/arm_compute/graph/TypePrinter.h
@@ -116,6 +116,9 @@ inline ::std::ostream &operator<<(::std::ostream &os, const NodeType &node_type)
         case NodeType::SoftmaxLayer:
             os << "SoftmaxLayer";
             break;
+        case NodeType::SliceLayer:
+            os << "SliceLayer";
+            break;
         case NodeType::SplitLayer:
             os << "SplitLayer";
             break;
diff --git a/arm_compute/graph/Types.h b/arm_compute/graph/Types.h
index cc3e346b12..1e613f7e29 100644
--- a/arm_compute/graph/Types.h
+++ b/arm_compute/graph/Types.h
@@ -148,6 +148,7 @@ enum class NodeType
     ReshapeLayer,
     ResizeLayer,
     SoftmaxLayer,
+    SliceLayer,
     SplitLayer,
     YOLOLayer,
 
diff --git a/arm_compute/graph/backends/FunctionHelpers.h b/arm_compute/graph/backends/FunctionHelpers.h
index 9ef7226ceb..7f5093aa24 100644
--- a/arm_compute/graph/backends/FunctionHelpers.h
+++ b/arm_compute/graph/backends/FunctionHelpers.h
@@ -735,7 +735,7 @@ std::unique_ptr<IFunction> create_pooling_layer(PoolingLayerNode &node)
 
 /** Create a backend reorg layer function
  *
- * @tparam ReorgLayerFunction Backend reshape function
+ * @tparam ReorgLayerFunction Backend reorg function
  * @tparam TargetInfo         Target-specific information
  *
  * @param[in] node Node to create the backend function for
@@ -840,6 +840,41 @@ std::unique_ptr<IFunction> create_resize_layer(ResizeLayerNode &node)
     return std::move(func);
 }
 
+/** Create a backend slice layer function
+ *
+ * @tparam SliceLayerFunction Backend slice function
+ * @tparam TargetInfo         Target-specific information
+ *
+ * @param[in] node Node to create the backend function for
+ *
+ * @return Backend slice layer function
+ */
+template <typename SliceLayerFunction, typename TargetInfo>
+std::unique_ptr<IFunction> create_slice_layer(SliceLayerNode &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));
+    ARM_COMPUTE_ERROR_ON(input == nullptr);
+    ARM_COMPUTE_ERROR_ON(output == nullptr);
+
+    // Create and configure function
+    auto func = support::cpp14::make_unique<SliceLayerFunction>();
+    func->configure(input, output, node.starts(), node.ends());
+
+    // 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 softmax layer function
  *
  * @tparam SoftmaxLayerFunction Backend softmax function
diff --git a/arm_compute/graph/backends/ValidateHelpers.h b/arm_compute/graph/backends/ValidateHelpers.h
index eb3762571d..2dc349174d 100644
--- a/arm_compute/graph/backends/ValidateHelpers.h
+++ b/arm_compute/graph/backends/ValidateHelpers.h
@@ -249,6 +249,30 @@ Status validate_reorg_layer(ReorgLayerNode &node)
     return ReorgLayer::validate(input, output, node.stride());
 }
 
+/** Validates a Slice layer node
+ *
+ * @tparam SliceLayer Slice layer function type
+ *
+ * @param[in] node Node to validate
+ *
+ * @return Status
+ */
+template <typename SliceLayer>
+Status validate_slice_layer(SliceLayerNode &node)
+{
+    ARM_COMPUTE_LOG_GRAPH_VERBOSE("Validating Slice 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 Coordinates         starts = node.starts();
+    const Coordinates         ends   = node.ends();
+
+    return SliceLayer::validate(input, output, starts, ends);
+}
+
 /** Validates a YOLO layer node
  *
  * @tparam YOLOLayer YOLO layer type
diff --git a/arm_compute/graph/frontend/Layers.h b/arm_compute/graph/frontend/Layers.h
index bbfda9ca82..3a45115d7c 100644
--- a/arm_compute/graph/frontend/Layers.h
+++ b/arm_compute/graph/frontend/Layers.h
@@ -718,6 +718,32 @@ private:
     ITensorAccessorUPtr _add_w;
 };
 
+/** Slice Layer */
+class SliceLayer final : public ILayer
+{
+public:
+    /** Construct a slice layer.
+     *
+     * @param[in] starts The starts of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     * @param[in] ends   The ends of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     */
+    SliceLayer(Coordinates &starts, Coordinates &ends)
+        : _starts(starts), _ends(ends)
+    {
+    }
+
+    NodeID create_layer(IStream &s) override
+    {
+        NodeParams  common_params = { name(), s.hints().target_hint };
+        NodeIdxPair input         = { s.tail_node(), 0 };
+        return GraphBuilder::add_slice_node(s.graph(), common_params, input, _starts, _ends);
+    }
+
+private:
+    Coordinates _starts;
+    Coordinates _ends;
+};
+
 /** Softmax Layer */
 class SoftmaxLayer final : public ILayer
 {
diff --git a/arm_compute/graph/nodes/Nodes.h b/arm_compute/graph/nodes/Nodes.h
index 92dfa41fc3..f1b899f784 100644
--- a/arm_compute/graph/nodes/Nodes.h
+++ b/arm_compute/graph/nodes/Nodes.h
@@ -45,6 +45,7 @@
 #include "arm_compute/graph/nodes/ReorgLayerNode.h"
 #include "arm_compute/graph/nodes/ReshapeLayerNode.h"
 #include "arm_compute/graph/nodes/ResizeLayerNode.h"
+#include "arm_compute/graph/nodes/SliceLayerNode.h"
 #include "arm_compute/graph/nodes/SoftmaxLayerNode.h"
 #include "arm_compute/graph/nodes/SplitLayerNode.h"
 #include "arm_compute/graph/nodes/YOLOLayerNode.h"
diff --git a/arm_compute/graph/nodes/NodesFwd.h b/arm_compute/graph/nodes/NodesFwd.h
index c000834a86..18a8e2efa2 100644
--- a/arm_compute/graph/nodes/NodesFwd.h
+++ b/arm_compute/graph/nodes/NodesFwd.h
@@ -52,6 +52,7 @@ class ReorgLayerNode;
 class ReshapeLayerNode;
 class ResizeLayerNode;
 class SoftmaxLayerNode;
+class SliceLayerNode;
 class SplitLayerNode;
 class YOLOLayerNode;
 } // namespace graph
diff --git a/arm_compute/graph/nodes/SliceLayerNode.h b/arm_compute/graph/nodes/SliceLayerNode.h
new file mode 100644
index 0000000000..861654eaa3
--- /dev/null
+++ b/arm_compute/graph/nodes/SliceLayerNode.h
@@ -0,0 +1,78 @@
+/*
+ * 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_SLICE_LAYER_NODE_H__
+#define __ARM_COMPUTE_GRAPH_SLICE_LAYER_NODE_H__
+
+#include "arm_compute/graph/INode.h"
+
+#include <tuple>
+
+namespace arm_compute
+{
+namespace graph
+{
+/** Slice Layer node */
+class SliceLayerNode final : public INode
+{
+public:
+    /** Default Constructor
+     *
+     * @param[in] starts The starts of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     * @param[in] ends   The ends of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     */
+    SliceLayerNode(Coordinates &starts, Coordinates &ends);
+    /** Computes slice layer output descriptor
+     *
+     * @param[in] input_descriptor Descriptor of the input tensor
+     * @param[in] starts           The starts of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     * @param[in] ends             The ends of the dimensions of the input tensor to be sliced. The length must be of rank(input).
+     *
+     * @return  Output descriptor
+     */
+    static TensorDescriptor compute_output_descriptor(const TensorDescriptor &input_descriptor,
+                                                      const Coordinates &starts, const Coordinates &ends);
+    /** Start coordinates accessor
+     *
+     * @return Start coordinates of the dimensions
+     */
+    Coordinates starts() const;
+    /** End coordinates accessor
+     *
+     * @return End coordinates of the dimensions
+     */
+    Coordinates ends() 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:
+    Coordinates _starts;
+    Coordinates _ends;
+};
+} // namespace graph
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_GRAPH_SLICE_LAYER_NODE_H__ */