From 8ed39ae450a077c7e4d672b5f05ff1d68ee67aab Mon Sep 17 00:00:00 2001
From: Narumol Prangnawarat <narumol.prangnawarat@arm.com>
Date: Thu, 15 Jul 2021 16:16:25 +0100
Subject: MLCE-530 Add front end support for UnidirectionalSequenceLstm on
 ArmNN

Signed-off-by: Narumol Prangnawarat <narumol.prangnawarat@arm.com>
Change-Id: I57bcbdec3eb0155f41af0fe7d6abf9bac2ec86eb
---
 .../layers/UnidirectionalSequenceLstmLayer.hpp     | 65 ++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 src/armnn/layers/UnidirectionalSequenceLstmLayer.hpp

(limited to 'src/armnn/layers/UnidirectionalSequenceLstmLayer.hpp')

diff --git a/src/armnn/layers/UnidirectionalSequenceLstmLayer.hpp b/src/armnn/layers/UnidirectionalSequenceLstmLayer.hpp
new file mode 100644
index 0000000000..fb59f01ab6
--- /dev/null
+++ b/src/armnn/layers/UnidirectionalSequenceLstmLayer.hpp
@@ -0,0 +1,65 @@
+//
+// Copyright © 2021 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+#pragma once
+
+#include "LayerWithParameters.hpp"
+#include "LstmParameters.hpp"
+
+namespace armnn
+{
+
+class ScopedTensorHandle;
+
+/// This layer represents a LSTM operation.
+class UnidirectionalSequenceLstmLayer : public LayerWithParameters<LstmDescriptor>
+{
+public:
+
+    LstmBasicParameters m_BasicParameters;
+    LstmOptCifgParameters m_CifgParameters;
+    LstmOptProjectionParameters m_ProjectionParameters;
+    LstmOptPeepholeParameters m_PeepholeParameters;
+    LstmOptLayerNormParameters m_LayerNormParameters;
+
+    /// Makes a workload for the UnidirectionalSequence LSTM type.
+    /// @param [in] graph The graph where this layer can be found.
+    /// @param [in] factory The workload factory which will create the workload.
+    /// @return A pointer to the created workload, or nullptr if not created.
+    virtual std::unique_ptr<IWorkload> CreateWorkload(const IWorkloadFactory& factory) const override;
+
+    /// Creates a dynamically-allocated copy of this layer.
+    /// @param [in] graph The graph into which this layer is being cloned.
+    UnidirectionalSequenceLstmLayer* Clone(Graph& graph) const override;
+
+    /// Check if the input tensor shape(s)
+    /// will lead to a valid configuration of @ref UnidirectionalSequenceLstmLayer.
+    /// @param [in] shapeInferenceMethod Indicates if output shape shall be overwritten or just validated.
+    void ValidateTensorShapesFromInputs() override;
+
+    /// By default returns inputShapes if the number of inputs are equal to number of outputs,
+    /// otherwise infers the output shapes from given input shapes and layer properties.
+    /// @param [in] inputShapes The input shapes layer has.
+    /// @return A vector to the inferred output shape.
+    std::vector<TensorShape> InferOutputShapes(const std::vector<TensorShape>& inputShapes) const override;
+
+    void Accept(ILayerVisitor& visitor) const override;
+
+    void ExecuteStrategy(IStrategy& strategy) const override;
+
+protected:
+    /// Constructor to create a UnidirectionalSequenceLstmLayer.
+    /// @param [in] param LstmDescriptor to configure the lstm operation.
+    /// @param [in] name Optional name for the layer.
+    UnidirectionalSequenceLstmLayer(const LstmDescriptor& param, const char* name);
+
+    /// Default destructor
+    ~UnidirectionalSequenceLstmLayer() = default;
+
+    /// Retrieve the handles to the constant values stored by the layer.
+    /// @return A vector of the constant tensors stored by this layer.
+    Layer::ConstantTensors GetConstantTensorsByRef() override;
+};
+
+} // namespace
-- 
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