IVGCVSW-2848 - Add TfLite Parser support for Unpack layer

* Added ParseUnpack in TfLiteParser
* New Unpack test file with test reproducing unpack in DeepSpeechV1 model
* Added documentation for supported Unpack to TensorflorLiteSupport.md

Signed-off-by: Nina Drozd <nina.drozd@arm.com>
Change-Id: Ie920d46254ff4b4ab544407ace4c1d489af83157

1 files changed, 119 insertions, 0 deletions

diff --git a/src/armnnTfLiteParser/test/Unpack.cpp b/src/armnnTfLiteParser/test/Unpack.cpp
new file mode 100644
index 0000000000..10e682e36a
--- /dev/null
+++ b/src/armnnTfLiteParser/test/Unpack.cpp
@@ -0,0 +1,119 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include <boost/test/unit_test.hpp>
+#include "ParserFlatbuffersFixture.hpp"
+#include "../TfLiteParser.hpp"
+
+#include <string>
+#include <iostream>
+
+BOOST_AUTO_TEST_SUITE(TensorflowLiteParser)
+
+struct UnpackFixture : public ParserFlatbuffersFixture
+{
+    explicit UnpackFixture(const std::string & inputShape,
+                           const unsigned int numberOfOutputs,
+                           const std::string & outputShape,
+                           const std::string & axis,
+                           const std::string & num)
+    {
+        // As input index is 0, output indexes start at 1
+        std::string outputIndexes = "1";
+        for(unsigned int i = 1; i < numberOfOutputs; i++)
+        {
+            outputIndexes += ", " + std::to_string(i+1);
+        }
+        m_JsonString = R"(
+            {
+                "version": 3,
+                "operator_codes": [ { "builtin_code": "UNPACK" } ],
+                "subgraphs": [ {
+                    "tensors": [
+                        {
+                            "shape": )" + inputShape + R"(,
+                            "type": "FLOAT32",
+                            "buffer": 0,
+                            "name": "inputTensor",
+                            "quantization": {
+                                "min": [ 0.0 ],
+                                "max": [ 255.0 ],
+                                "scale": [ 1.0 ],
+                                "zero_point": [ 0 ],
+                            }
+                        },)";
+        // Append the required number of outputs for this UnpackFixture.
+        // As input index is 0, output indexes start at 1.
+        for(unsigned int i = 0; i < numberOfOutputs; i++)
+        {
+            m_JsonString += R"(
+                        {
+                            "shape": )" + outputShape + R"( ,
+                                "type": "FLOAT32",
+                                "buffer": )" + std::to_string(i + 1) + R"(,
+                                "name": "outputTensor)" + std::to_string(i + 1) + R"(",
+                                "quantization": {
+                                "min": [ 0.0 ],
+                                "max": [ 255.0 ],
+                                "scale": [ 1.0 ],
+                                "zero_point": [ 0 ],
+                            }
+                        },)";
+        }
+        m_JsonString += R"(
+                    ],
+                    "inputs": [ 0 ],
+                    "outputs": [ )" + outputIndexes + R"( ],
+                    "operators": [
+                        {
+                            "opcode_index": 0,
+                            "inputs": [ 0 ],
+                            "outputs": [ )" + outputIndexes + R"( ],
+                            "builtin_options_type": "UnpackOptions",
+                            "builtin_options": {
+                                "axis": )" + axis;
+
+                    if(!num.empty())
+                    {
+                        m_JsonString += R"(,
+                                "num" : )" + num;
+                    }
+
+                    m_JsonString += R"(
+                            },
+                            "custom_options_format": "FLEXBUFFERS"
+                        }
+                    ],
+                } ],
+                "buffers" : [
+                    { },
+                    { }
+                ]
+            }
+        )";
+        Setup();
+    }
+};
+
+struct DefaultUnpackAxisZeroFixture : UnpackFixture
+{
+    DefaultUnpackAxisZeroFixture() : UnpackFixture("[ 4, 1, 6 ]", 4, "[ 1, 6 ]", "0", "") {}
+};
+
+BOOST_FIXTURE_TEST_CASE(UnpackAxisZeroNumIsDefaultNotSpecified, DefaultUnpackAxisZeroFixture)
+{
+    RunTest<2, armnn::DataType::Float32>(
+        0,
+        { {"inputTensor", { 1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f,
+                            7.0f, 8.0f, 9.0f, 10.0f, 11.0f, 12.0f,
+                            13.0f, 14.0f, 15.0f, 16.0f, 17.0f, 18.0f,
+                            19.0f, 20.0f, 21.0f, 22.0f, 23.0f, 24.0f } } },
+        { {"outputTensor1", { 1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f }},
+          {"outputTensor2", { 7.0f,  8.0f,  9.0f, 10.0f, 11.0f, 12.0f }},
+          {"outputTensor3", { 13.0f, 14.0f, 15.0f, 16.0f, 17.0f, 18.0f }},
+          {"outputTensor4", { 19.0f, 20.0f, 21.0f, 22.0f, 23.0f, 24.0f }} });
+}
+
+BOOST_AUTO_TEST_SUITE_END()