Remove (NE/CL)YoloLayer support

YOLO layer is too specialized and specific to a single model type. Can
be decomposed using split, activation and concatenate layers

Partially Resolves: COMPMID-3996

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: I3cde88f8d4cc7d8c70ce1bb3b32b00f8d09bdca2
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4678
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>

1 files changed, 43 insertions, 2 deletions

diff --git a/src/graph/GraphBuilder.cpp b/src/graph/GraphBuilder.cpp
index 2f74f065d5..2afc1e2533 100644
--- a/src/graph/GraphBuilder.cpp
+++ b/src/graph/GraphBuilder.cpp
@@ -737,9 +737,50 @@ NodeID GraphBuilder::add_upsample_node(Graph &g, NodeParams params, NodeIdxPair
     return create_simple_single_input_output_node<UpsampleLayerNode>(g, params, input, info, upsampling_policy);
 }
 
-NodeID GraphBuilder::add_yolo_node(Graph &g, NodeParams params, NodeIdxPair input, ActivationLayerInfo act_info, int32_t num_classes)
+NodeID GraphBuilder::add_yolo_node(Graph &g, NodeParams params, NodeIdxPair input, ActivationLayerInfo act_info)
 {
-    return create_simple_single_input_output_node<YOLOLayerNode>(g, params, input, act_info, num_classes);
+    check_nodeidx_pair(input, g);
+
+    // Get input tensor descriptor
+    const TensorDescriptor input_tensor_desc = get_tensor_descriptor(g, g.node(input.node_id)->outputs()[0]);
+    const bool             is_nhwc           = input_tensor_desc.layout == DataLayout::NHWC;
+
+    // Box format: [Objectness:1][Box:4][Classes:N]
+
+    // Activate objectness and front part of the box
+    const Coordinates box_start(0, 0, 0);
+    const Coordinates box_end = is_nhwc ? Coordinates(3, -1, -1) : Coordinates(-1, -1, 3);
+    NodeID            box     = g.add_node<SliceLayerNode>(box_start, box_end);
+    NodeID            act_box = g.add_node<ActivationLayerNode>(act_info);
+    set_node_params(g, box, params);
+    set_node_params(g, act_box, params);
+    g.add_connection(input.node_id, input.index, box, 0);
+    g.add_connection(box, 0, act_box, 0);
+
+    // Immutable part
+    const Coordinates imm_start = is_nhwc ? Coordinates(3, 0, 0) : Coordinates(0, 0, 3);
+    const Coordinates imm_end   = is_nhwc ? Coordinates(5, -1, -1) : Coordinates(-1, -1, 5);
+    NodeID            imm       = g.add_node<SliceLayerNode>(imm_start, imm_end);
+    set_node_params(g, imm, params);
+    g.add_connection(input.node_id, input.index, imm, 0);
+
+    // Activation classes and end part of box
+    const Coordinates cls_start = is_nhwc ? Coordinates(5, 0, 0) : Coordinates(0, 0, 5);
+    const Coordinates cls_end   = is_nhwc ? Coordinates(-1, -1, -1) : Coordinates(-1, -1, -1);
+    NodeID            cls       = g.add_node<SliceLayerNode>(cls_start, cls_end);
+    NodeID            cls_act   = g.add_node<ActivationLayerNode>(act_info);
+    set_node_params(g, cls, params);
+    set_node_params(g, cls_act, params);
+    g.add_connection(input.node_id, input.index, cls, 0);
+    g.add_connection(cls, 0, cls_act, 0);
+
+    NodeID concat = g.add_node<ConcatenateLayerNode>(3, descriptors::ConcatLayerDescriptor(DataLayoutDimension::CHANNEL));
+    set_node_params(g, concat, params);
+    g.add_connection(act_box, 0, concat, 0);
+    g.add_connection(imm, 0, concat, 1);
+    g.add_connection(cls_act, 0, concat, 2);
+
+    return concat;
 }
 } // namespace graph
 } // namespace arm_compute