IVGCVSW-6300 'IMemoryOptimizerStrategy Add strategy library and add support in BackendRegistry'

* Updated IRuntime interface for providing custom memory optimizer strategy.
* Enabled selecting existing memory optimizer strategy by using BackendOptions
* Added MemoryOptimizerStrategyLibrary that sets one of the existing memory optimizer
  strategies selected by user

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: I037f8ac8efa79c0f71bd63e379101e3ad92d80c9

4 files changed, 49 insertions, 0 deletions

diff --git a/include/armnn/BackendOptions.hpp b/include/armnn/BackendOptions.hpp
index b8bf8f51f2..33cecf6614 100644
--- a/include/armnn/BackendOptions.hpp
+++ b/include/armnn/BackendOptions.hpp
@@ -296,4 +296,22 @@ void ParseOptions(const std::vector<BackendOptions>& options, BackendId backend,
     }
 }
 
+inline bool ParseBooleanBackendOption(const armnn::BackendOptions::Var& value, bool defaultValue)
+{
+    if (value.IsBool())
+    {
+        return value.AsBool();
+    }
+    return defaultValue;
+}
+
+inline std::string ParseStringBackendOption(const armnn::BackendOptions::Var& value, std::string defaultValue)
+{
+    if (value.IsString())
+    {
+        return value.AsString();
+    }
+    return defaultValue;
+}
+
 } //namespace armnn
diff --git a/include/armnn/BackendRegistry.hpp b/include/armnn/BackendRegistry.hpp
index c13aa9f8b6..0d09607de2 100644
--- a/include/armnn/BackendRegistry.hpp
+++ b/include/armnn/BackendRegistry.hpp
@@ -8,7 +8,9 @@
 #include <armnn/BackendId.hpp>
 #include <armnn/Optional.hpp>
 #include <armnn/backends/ICustomAllocator.hpp>
+#include <armnn/backends/IMemoryOptimizerStrategy.hpp>
 
+#include <algorithm>
 #include <memory>
 #include <unordered_map>
 #include <functional>
@@ -22,6 +24,7 @@ namespace profiling
 }
 class IBackendInternal;
 using IBackendInternalUniquePtr = std::unique_ptr<IBackendInternal>;
+using MemoryOptimizerStrategiesMapRef = std::unordered_map<BackendId, std::shared_ptr<IMemoryOptimizerStrategy>>;
 
 class BackendRegistry
 {
@@ -38,6 +41,8 @@ public:
     void SetProfilingService(armnn::Optional<profiling::ProfilingService&> profilingService);
     void RegisterAllocator(const BackendId& id, std::shared_ptr<ICustomAllocator> alloc);
     std::unordered_map<BackendId, std::shared_ptr<ICustomAllocator>> GetAllocators();
+    void RegisterMemoryOptimizerStrategy(const BackendId& id, std::shared_ptr<IMemoryOptimizerStrategy> strategy);
+    MemoryOptimizerStrategiesMapRef GetMemoryOptimizerStrategies();
 
     BackendRegistry() {}
     virtual ~BackendRegistry() {}
@@ -54,6 +59,7 @@ public:
 
     void Deregister(const BackendId& id);
     void DeregisterAllocator(const BackendId &id);
+    void DeregisterMemoryOptimizerStrategy(const BackendId &id);
 
 protected:
     using FactoryStorage = std::unordered_map<BackendId, FactoryFunction>;
@@ -68,6 +74,7 @@ private:
     FactoryStorage m_Factories;
     armnn::Optional<profiling::ProfilingService&> m_ProfilingService;
     std::unordered_map<BackendId, std::shared_ptr<ICustomAllocator>> m_CustomMemoryAllocatorMap;
+    std::unordered_map<BackendId, std::shared_ptr<IMemoryOptimizerStrategy>> m_MemoryOptimizerStrategyMap;
 };
 
 BackendRegistry& BackendRegistryInstance();
diff --git a/include/armnn/IRuntime.hpp b/include/armnn/IRuntime.hpp
index a46830c95a..ca9a0ceec2 100644
--- a/include/armnn/IRuntime.hpp
+++ b/include/armnn/IRuntime.hpp
@@ -15,6 +15,7 @@
 #include "profiling/ILocalPacketHandler.hpp"
 
 #include <armnn/backends/ICustomAllocator.hpp>
+#include <armnn/backends/IMemoryOptimizerStrategy.hpp>
 #include <memory>
 #include <map>
 
@@ -106,6 +107,7 @@ public:
             , m_DynamicBackendsPath("")
             , m_ProtectedMode(false)
             , m_CustomAllocatorMap()
+            , m_MemoryOptimizerStrategyMap()
         {}
 
         /// If set, uses the GpuAcc tuned parameters from the given object when executing GPU workloads.
@@ -135,6 +137,14 @@ public:
         /// @note Only supported for GpuAcc
         std::map<BackendId, std::shared_ptr<ICustomAllocator>> m_CustomAllocatorMap;
 
+        /// @brief A map to define a custom memory optimizer strategy for specific backend Ids.
+        ///
+        /// @details  A Memory Optimizer Strategy provides a solution to an abstract representation of
+        /// a network's memory requirements. This can also be used to return a pre-computed solution
+        /// for a specific network. Set this if you want to implement a Custom Memory Optimizer Strategy
+        /// for a given backend.
+        std::map<BackendId, std::shared_ptr<IMemoryOptimizerStrategy>> m_MemoryOptimizerStrategyMap;
+
         struct ExternalProfilingOptions
         {
             ExternalProfilingOptions()
@@ -168,6 +178,7 @@ public:
         ///       {
         ///         {"TuningLevel", 2},
         ///         {"TuningFile", filename}
+        ///         {"MemoryOptimizerStrategy", strategyname}
         ///       }
         ///     });
         /// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -185,6 +196,9 @@ public:
         /// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
         /// The following backend options are available:
+        /// AllBackends:
+        ///   "MemoryOptimizerStrategy" : string [stategynameString]
+        ///    (Existing Memory Optimizer Strategies: ConstLayerMemoryOptimizerStrategy)
         /// GpuAcc:
         ///   "TuningLevel" : int [0..3] (0=UseOnly(default) | 1=RapidTuning | 2=NormalTuning | 3=ExhaustiveTuning)
         ///   "TuningFile" : string [filenameString]
diff --git a/include/armnn/TypesUtils.hpp b/include/armnn/TypesUtils.hpp
index 9bd9c8148f..d08f592d86 100644
--- a/include/armnn/TypesUtils.hpp
+++ b/include/armnn/TypesUtils.hpp
@@ -249,6 +249,16 @@ constexpr const char* GetResizeMethodAsCString(ResizeMethod method)
     }
 }
 
+constexpr const char* GetMemBlockStrategyTypeName(MemBlockStrategyType memBlockStrategyType)
+{
+    switch (memBlockStrategyType)
+    {
+        case MemBlockStrategyType::SingleAxisPacking: return "SingleAxisPacking";
+        case MemBlockStrategyType::MultiAxisPacking:  return "MultiAxisPacking";
+        default:                                      return "Unknown";
+    }
+}
+
 template<typename T>
 struct IsHalfType
     : std::integral_constant<bool, std::is_floating_point<T>::value && sizeof(T) == 2>