Add DepthToSpace layer node to Graph API

Change-Id: I5db780fb9c94160130e9986bbfc739124bfa8041
Signed-off-by: thecha01 <theo.charalambous@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/3914
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>

9 files changed, 167 insertions, 0 deletions

diff --git a/arm_compute/graph/GraphBuilder.h b/arm_compute/graph/GraphBuilder.h
index bce1ce4c40..4948f5845e 100644
--- a/arm_compute/graph/GraphBuilder.h
+++ b/arm_compute/graph/GraphBuilder.h
@@ -173,6 +173,16 @@ public:
      * @return Node ID of the created node, EmptyNodeID in case of error
      */
     static NodeID add_concatenate_node(Graph &g, NodeParams params, const std::vector<NodeIdxPair> &inputs, const descriptors::ConcatLayerDescriptor &concat_descriptor);
+    /** Adds an depth to space 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 depth to space layer node as a NodeID-Index pair
+     * @param[in] block_shape Block shape to reshape tensor with
+     *
+     * @return Node ID of the created node, EmptyNodeID in case of error
+     */
+    static NodeID add_depth_to_space_node(Graph &g, NodeParams params, NodeIdxPair input, int32_t block_shape);
     /** Adds a depth-wise convolution 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 5d6c9f308d..281de36bb2 100644
--- a/arm_compute/graph/TypePrinter.h
+++ b/arm_compute/graph/TypePrinter.h
@@ -83,6 +83,9 @@ inline ::std::ostream &operator<<(::std::ostream &os, const NodeType &node_type)
         case NodeType::DeconvolutionLayer:
             os << "DeconvolutionLayer";
             break;
+        case NodeType::DepthToSpaceLayer:
+            os << "DepthToSpaceLayer";
+            break;
         case NodeType::DequantizationLayer:
             os << "DequantizationLayer";
             break;
diff --git a/arm_compute/graph/Types.h b/arm_compute/graph/Types.h
index 65d737c7b2..82015114ba 100644
--- a/arm_compute/graph/Types.h
+++ b/arm_compute/graph/Types.h
@@ -147,6 +147,7 @@ enum class NodeType
     ConcatenateLayer,
     ConvolutionLayer,
     DeconvolutionLayer,
+    DepthToSpaceLayer,
     DepthwiseConvolutionLayer,
     DequantizationLayer,
     DetectionOutputLayer,
diff --git a/arm_compute/graph/backends/FunctionHelpers.h b/arm_compute/graph/backends/FunctionHelpers.h
index 60a03e67b0..570e981e98 100644
--- a/arm_compute/graph/backends/FunctionHelpers.h
+++ b/arm_compute/graph/backends/FunctionHelpers.h
@@ -614,6 +614,45 @@ std::unique_ptr<IFunction> create_depthwise_convolution_layer(DepthwiseConvoluti
     return RETURN_UNIQUE_PTR(func);
 }
 
+/** Create a backend depth to space layer function
+ *
+ * @tparam DepthToSpaceLayerNode Function Backend depth to space function
+ * @tparam TargetInfo            Target-specific information
+ *
+ * @param[in] node Node to create the backend function for
+ *
+ * @return Backend depth to space layer function
+ */
+template <typename DepthToSpaceLayerFunction, typename TargetInfo>
+std::unique_ptr<IFunction> create_depth_to_space_layer(DepthToSpaceLayerNode &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<DepthToSpaceLayerFunction>();
+    func->configure(input, output, node.block_shape());
+
+    // Log info
+    ARM_COMPUTE_LOG_GRAPH_INFO("Instantiated "
+                               << node.name()
+                               << " Type: " << node.type()
+                               << " Target: " << TargetInfo::TargetType
+                               << " Data Type: " << input->info()->data_type()
+                               << " Input shape: " << input->info()->tensor_shape()
+                               << " Block Size: " << node.block_shape()
+                               << " Output shape: " << output->info()->tensor_shape()
+                               << std::endl);
+
+    return RETURN_UNIQUE_PTR(func);
+}
+
 /** Create a backend dequantize layer function
  *
  * @tparam DequantizationLayer Function Backend dequantize function
diff --git a/arm_compute/graph/backends/ValidateHelpers.h b/arm_compute/graph/backends/ValidateHelpers.h
index 70eae6c3ad..0259bfb930 100644
--- a/arm_compute/graph/backends/ValidateHelpers.h
+++ b/arm_compute/graph/backends/ValidateHelpers.h
@@ -199,6 +199,27 @@ Status validate_depthwise_convolution_layer(DepthwiseConvolutionLayerNode &node)
 
     return status;
 }
+/** Validates a depth to space layer node
+ *
+ * @tparam DequantizationLayer Dequantize layer type
+ *
+ * @param[in] node Node to validate
+ *
+ * @return Status
+ */
+template <typename DepthToSpaceLayer>
+Status validate_depth_to_space_layer(DepthToSpaceLayerNode &node)
+{
+    ARM_COMPUTE_LOG_GRAPH_VERBOSE("Validating DetectionOutputLayer 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));
+
+    return DepthToSpaceLayer::validate(input, output, node.block_shape());
+}
 /** Validates a dequantize layer node
  *
  * @tparam DequantizationLayer Dequantize layer type
diff --git a/arm_compute/graph/frontend/Layers.h b/arm_compute/graph/frontend/Layers.h
index 6aeebb45ec..65100a3bd5 100644
--- a/arm_compute/graph/frontend/Layers.h
+++ b/arm_compute/graph/frontend/Layers.h
@@ -489,6 +489,31 @@ private:
     const QuantizationInfo _weights_quant_info;
     const QuantizationInfo _out_quant_info;
 };
+
+/** DepthToSpace Layer */
+class DepthToSpaceLayer final : public ILayer
+{
+public:
+    /** Construct an DepthToSpace layer.
+     *
+     * @param[in] block_shape Block size to rearranged
+     */
+    DepthToSpaceLayer(int32_t block_shape)
+        : _block_shape(block_shape)
+    {
+    }
+
+    NodeID create_layer(IStream &s) override
+    {
+        NodeParams  common_params = { name(), s.hints().target_hint };
+        NodeIdxPair input         = { s.tail_node(), 0 };
+        return GraphBuilder::add_depth_to_space_node(s.graph(), common_params, input, _block_shape);
+    }
+
+private:
+    int32_t _block_shape;
+};
+
 /** Dequantization Layer */
 class DequantizationLayer final : public ILayer
 {
diff --git a/arm_compute/graph/nodes/DepthToSpaceLayerNode.h b/arm_compute/graph/nodes/DepthToSpaceLayerNode.h
new file mode 100644
index 0000000000..25e30e2c67
--- /dev/null
+++ b/arm_compute/graph/nodes/DepthToSpaceLayerNode.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2020 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_DEPTH_TO_SPACE_LAYER_NODE_H
+#define ARM_COMPUTE_GRAPH_DEPTH_TO_SPACE_LAYER_NODE_H
+
+#include "arm_compute/graph/INode.h"
+
+namespace arm_compute
+{
+namespace graph
+{
+/** DepthToSpace Layer node */
+class DepthToSpaceLayerNode final : public INode
+{
+public:
+    /** Default Constructor */
+    DepthToSpaceLayerNode(int block_shape);
+    /** Block shape policy accessor
+     *
+     * @return Block shape
+     */
+    int block_shape() const;
+    /** Computes depth to space output descriptor
+     *
+     * @warning block_shape must be greater than or equal to 2
+     *
+     * @param[in] input_descriptor Input descriptor
+     * @param[in] block_shape      Number of output neurons
+     *
+     * @return Output descriptor
+     */
+    static TensorDescriptor compute_output_descriptor(const TensorDescriptor &input_descriptor, int block_shape);
+
+    // 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:
+    int _block_shape;
+};
+} // namespace graph
+} // namespace arm_compute
+#endif /* ARM_COMPUTE_GRAPH_DEPTH_TO_SPACE_LAYER_NODE_H */
diff --git a/arm_compute/graph/nodes/Nodes.h b/arm_compute/graph/nodes/Nodes.h
index bf4ab87cda..6df7ffab69 100644
--- a/arm_compute/graph/nodes/Nodes.h
+++ b/arm_compute/graph/nodes/Nodes.h
@@ -32,6 +32,7 @@
 #include "arm_compute/graph/nodes/ConstNode.h"
 #include "arm_compute/graph/nodes/ConvolutionLayerNode.h"
 #include "arm_compute/graph/nodes/DeconvolutionLayerNode.h"
+#include "arm_compute/graph/nodes/DepthToSpaceLayerNode.h"
 #include "arm_compute/graph/nodes/DepthwiseConvolutionLayerNode.h"
 #include "arm_compute/graph/nodes/DequantizationLayerNode.h"
 #include "arm_compute/graph/nodes/DetectionOutputLayerNode.h"
diff --git a/arm_compute/graph/nodes/NodesFwd.h b/arm_compute/graph/nodes/NodesFwd.h
index 9541f4babe..63632848af 100644
--- a/arm_compute/graph/nodes/NodesFwd.h
+++ b/arm_compute/graph/nodes/NodesFwd.h
@@ -38,6 +38,7 @@ class ConcatenateLayerNode;
 class ConstNode;
 class ConvolutionLayerNode;
 class DeconvolutionLayerNode;
+class DepthToSpaceLayerNode;
 class DepthwiseConvolutionLayerNode;
 class DequantizationLayerNode;
 class DetectionOutputLayerNode;