COMPMID-996: Add support for grouped convolution.

Change-Id: I279e29ce20b3dde57445264dc11491f127b44d70
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/124429
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>

3 files changed, 81 insertions, 0 deletions

diff --git a/arm_compute/graph2/nodes/Nodes.h b/arm_compute/graph2/nodes/Nodes.h
index 8201361304..3786978661 100644
--- a/arm_compute/graph2/nodes/Nodes.h
+++ b/arm_compute/graph2/nodes/Nodes.h
@@ -39,5 +39,6 @@
 #include "arm_compute/graph2/nodes/PoolingLayerNode.h"
 #include "arm_compute/graph2/nodes/ReshapeLayerNode.h"
 #include "arm_compute/graph2/nodes/SoftmaxLayerNode.h"
+#include "arm_compute/graph2/nodes/SplitLayerNode.h"
 
 #endif /* __ARM_COMPUTE_GRAPH2_NODES_H__ */
diff --git a/arm_compute/graph2/nodes/NodesFwd.h b/arm_compute/graph2/nodes/NodesFwd.h
index 03ca65e056..08f2454cde 100644
--- a/arm_compute/graph2/nodes/NodesFwd.h
+++ b/arm_compute/graph2/nodes/NodesFwd.h
@@ -45,6 +45,7 @@ class OutputNode;
 class PoolingLayerNode;
 class ReshapeLayerNode;
 class SoftmaxLayerNode;
+class SplitLayerNode;
 } // namespace graph2
 } // namespace arm_compute
 #endif /* __ARM_COMPUTE_GRAPH2_NODES_FWD_H__ */
diff --git a/arm_compute/graph2/nodes/SplitLayerNode.h b/arm_compute/graph2/nodes/SplitLayerNode.h
new file mode 100644
index 0000000000..90e6134ac0
--- /dev/null
+++ b/arm_compute/graph2/nodes/SplitLayerNode.h
@@ -0,0 +1,79 @@
+/*
+ * 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_GRAPH2_SPLIT_LAYER_NODE_H__
+#define __ARM_COMPUTE_GRAPH2_SPLIT_LAYER_NODE_H__
+
+#include "arm_compute/graph2/INode.h"
+
+#include <tuple>
+
+namespace arm_compute
+{
+namespace graph2
+{
+/** Split Layer node */
+class SplitLayerNode final : public INode
+{
+public:
+    /** Default Constructor
+     *
+     * @param[in] num_splits Number of splits
+     * @param[in] axis       (Optional) Axis to split on. Supported axis >= 2. Defaults to 0
+     */
+    SplitLayerNode(unsigned int num_splits, unsigned int axis = 0);
+    /** Computes split layer output shape
+     *
+     * @param[in] input_shape Shape of the input
+     * @param[in] num_splits  Number of splits
+     * @param[in] axis        Axis to perform the split on
+     * @param[in] idx         Index of the split
+     *
+     * @return  A pair with the shape of the split and the starting coordinates
+     */
+    static std::pair<TensorShape, Coordinates> compute_output_shape(TensorShape input_shape, unsigned int num_splits, unsigned int axis, unsigned int idx);
+    /** Number of splits accessor
+     *
+     * @return Number of splits
+     */
+    unsigned int num_splits() const;
+    /** Split axis accessor
+     *
+     * @return Split axis
+     */
+    unsigned int axis() const;
+
+    // Inherited overridden methods:
+    Status           validate() override;
+    NodeType         type() const override;
+    bool             forward_descriptors() override;
+    TensorDescriptor configure_output(size_t idx) const override;
+    void accept(INodeVisitor &v) override;
+
+private:
+    unsigned int _num_splits;
+    unsigned int _axis;
+};
+} // namespace graph2
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_GRAPH2_SPLIT_LAYER_NODE_H__ */