COMPMID-2452: Add mnist example

* Add small-mnist example
* Add PrintAccessor
* Add DequantizationLayer graph node

Change-Id: I7bc8011e5a602f40fa3c47b231a2a69c804e78c2
Signed-off-by: Isabella Gottardi <isabella.gottardi@arm.com>
Reviewed-on: https://review.mlplatform.org/c/2274
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Giorgio Arena <giorgio.arena@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/src/graph/GraphBuilder.cpp b/src/graph/GraphBuilder.cpp
index 228f2d2..89c8c20 100644
--- a/src/graph/GraphBuilder.cpp
+++ b/src/graph/GraphBuilder.cpp
@@ -376,6 +376,11 @@
 
     return conv_nid;
 }
+NodeID GraphBuilder::add_dequantization_node(Graph &g, NodeParams params, NodeIdxPair input)
+{
+    return create_simple_single_input_output_node<DequantizationLayerNode>(g, params, input);
+}
+
 NodeID GraphBuilder::add_detection_output_node(Graph &g, NodeParams params, NodeIdxPair input_loc, NodeIdxPair input_conf, NodeIdxPair input_priorbox, const DetectionOutputLayerInfo &detect_info)
 {
     check_nodeidx_pair(input_loc, g);