IVGCVSW-5724 Add import tensor handling as ClImportTensorHandleFactory.

* Add new ClImportTensorHandlefactory for tensor import.
* Add unit tests.

Signed-off-by: Colm Donelan <Colm.Donelan@arm.com>
Change-Id: I61884fed65e764ebd6985fe0833e43a7296d0641

1 files changed, 122 insertions, 0 deletions

diff --git a/src/backends/cl/ClImportTensorHandleFactory.cpp b/src/backends/cl/ClImportTensorHandleFactory.cpp
new file mode 100644
index 0000000000..1812034814
--- /dev/null
+++ b/src/backends/cl/ClImportTensorHandleFactory.cpp
@@ -0,0 +1,122 @@
+//
+// Copyright © 2021 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "ClImportTensorHandleFactory.hpp"
+#include "ClTensorHandle.hpp"
+
+#include <armnn/utility/NumericCast.hpp>
+#include <armnn/utility/PolymorphicDowncast.hpp>
+
+#include <arm_compute/core/Coordinates.h>
+#include <arm_compute/runtime/CL/CLTensor.h>
+
+namespace armnn
+{
+
+using FactoryId = ITensorHandleFactory::FactoryId;
+
+std::unique_ptr<ITensorHandle> ClImportTensorHandleFactory::CreateSubTensorHandle(
+    ITensorHandle& parent, const TensorShape& subTensorShape, const unsigned int* subTensorOrigin) const
+{
+    arm_compute::Coordinates coords;
+    arm_compute::TensorShape shape = armcomputetensorutils::BuildArmComputeTensorShape(subTensorShape);
+
+    coords.set_num_dimensions(subTensorShape.GetNumDimensions());
+    for (unsigned int i = 0; i < subTensorShape.GetNumDimensions(); ++i)
+    {
+        // Arm compute indexes tensor coords in reverse order.
+        unsigned int revertedIndex = subTensorShape.GetNumDimensions() - i - 1;
+        coords.set(i, armnn::numeric_cast<int>(subTensorOrigin[revertedIndex]));
+    }
+
+    const arm_compute::TensorShape parentShape = armcomputetensorutils::BuildArmComputeTensorShape(parent.GetShape());
+
+    // In order for ACL to support subtensors the concat axis cannot be on x or y and the values of x and y
+    // must match the parent shapes
+    if (coords.x() != 0 || coords.y() != 0)
+    {
+        return nullptr;
+    }
+    if ((parentShape.x() != shape.x()) || (parentShape.y() != shape.y()))
+    {
+        return nullptr;
+    }
+
+    if (!::arm_compute::error_on_invalid_subtensor(__func__, __FILE__, __LINE__, parentShape, coords, shape))
+    {
+        return nullptr;
+    }
+
+    return std::make_unique<ClSubTensorHandle>(PolymorphicDowncast<IClTensorHandle*>(&parent), shape, coords);
+}
+
+std::unique_ptr<ITensorHandle> ClImportTensorHandleFactory::CreateTensorHandle(const TensorInfo& tensorInfo) const
+{
+    return ClImportTensorHandleFactory::CreateTensorHandle(tensorInfo, false);
+}
+
+std::unique_ptr<ITensorHandle> ClImportTensorHandleFactory::CreateTensorHandle(const TensorInfo& tensorInfo,
+                                                                               DataLayout dataLayout) const
+{
+    return ClImportTensorHandleFactory::CreateTensorHandle(tensorInfo, dataLayout, false);
+}
+
+std::unique_ptr<ITensorHandle> ClImportTensorHandleFactory::CreateTensorHandle(const TensorInfo& tensorInfo,
+                                                                               const bool IsMemoryManaged) const
+{
+    // If IsMemoryManaged is true then throw an exception.
+    if (IsMemoryManaged)
+    {
+        throw InvalidArgumentException("ClImportTensorHandleFactory does not support memory managed tensors.");
+    }
+    std::unique_ptr<ClTensorHandle> tensorHandle = std::make_unique<ClTensorHandle>(tensorInfo);
+    tensorHandle->SetImportEnabledFlag(true);
+    tensorHandle->SetImportFlags(GetImportFlags());
+    return tensorHandle;
+}
+
+std::unique_ptr<ITensorHandle> ClImportTensorHandleFactory::CreateTensorHandle(const TensorInfo& tensorInfo,
+                                                                               DataLayout dataLayout,
+                                                                               const bool IsMemoryManaged) const
+{
+    // If IsMemoryManaged is true then throw an exception.
+    if (IsMemoryManaged)
+    {
+        throw InvalidArgumentException("ClImportTensorHandleFactory does not support memory managed tensors.");
+    }
+    std::unique_ptr<ClTensorHandle> tensorHandle = std::make_unique<ClTensorHandle>(tensorInfo, dataLayout);
+    // If we are not Managing the Memory then we must be importing
+    tensorHandle->SetImportEnabledFlag(true);
+    tensorHandle->SetImportFlags(GetImportFlags());
+    return tensorHandle;
+}
+
+const FactoryId& ClImportTensorHandleFactory::GetIdStatic()
+{
+    static const FactoryId s_Id(ClImportTensorHandleFactoryId());
+    return s_Id;
+}
+
+const FactoryId& ClImportTensorHandleFactory::GetId() const
+{
+    return GetIdStatic();
+}
+
+bool ClImportTensorHandleFactory::SupportsSubTensors() const
+{
+    return true;
+}
+
+MemorySourceFlags ClImportTensorHandleFactory::GetExportFlags() const
+{
+    return m_ExportFlags;
+}
+
+MemorySourceFlags ClImportTensorHandleFactory::GetImportFlags() const
+{
+    return m_ImportFlags;
+}
+
+}    // namespace armnn
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