From 7a8892fe7c208cce76017acbabdd137c872ddadc Mon Sep 17 00:00:00 2001
From: Mohamed Nour Abouelseoud <mohamednour.abouelseoud@arm.com>
Date: Wed, 9 Jan 2019 14:19:58 +0000
Subject: [PATCH] IVGCVSW-2345 Add Rsqrt support in Tensorflow Parser

Change-Id: I7c7b65bd77b06925efdaf2c9c98c30994a12de42
---
 CMakeLists.txt                   |  1 +
 src/armnnTfParser/TfParser.cpp   | 17 ++++++++++++
 src/armnnTfParser/TfParser.hpp   |  1 +
 src/armnnTfParser/test/Rsqrt.cpp | 59 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 78 insertions(+)
 create mode 100644 src/armnnTfParser/test/Rsqrt.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9fedc25..407a51d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -417,6 +417,7 @@ if(BUILD_UNIT_TESTS)
             src/armnnTfParser/test/RealDiv.cpp
             src/armnnTfParser/test/Reshape.cpp
             src/armnnTfParser/test/ResizeBilinear.cpp
+            src/armnnTfParser/test/Rsqrt.cpp
             src/armnnTfParser/test/Shape.cpp
             src/armnnTfParser/test/Softmax.cpp
             src/armnnTfParser/test/TestDependencies.cpp
diff --git a/src/armnnTfParser/TfParser.cpp b/src/armnnTfParser/TfParser.cpp
index 3d0c72d..90bd992 100755
--- a/src/armnnTfParser/TfParser.cpp
+++ b/src/armnnTfParser/TfParser.cpp
@@ -345,6 +345,7 @@ const std::map<std::string, TfParser::OperationParsingFunction> TfParser::ms_Ope
     { "Relu6",                 &TfParser::ParseRelu6 },
     { "Reshape",               &TfParser::ParseReshape },
     { "ResizeBilinear",        &TfParser::ParseResizeBilinear },
+    { "Rsqrt",                 &TfParser::ParseRsqrt },
     { "Shape",                 &TfParser::ParseShape },
     { "Squeeze",               &TfParser::ParseSqueeze },
     { "Sigmoid",               &TfParser::ParseSigmoid },
@@ -2445,6 +2446,22 @@ ParsedTfOperationPtr TfParser::ParseSigmoid(const tensorflow::NodeDef& nodeDef,
     return AddActivationLayer(nodeDef, activationDesc);
 }
 
+ParsedTfOperationPtr TfParser::ParseRsqrt(const tensorflow::NodeDef &nodeDef,
+    const tensorflow::GraphDef &graphDef)
+{
+    boost::ignore_unused(graphDef);
+
+    std::vector<OutputOfParsedTfOperation> inputs = GetInputParsedTfOperationsChecked(nodeDef, 1);
+
+    IConnectableLayer* const layer = m_Network->AddRsqrtLayer(nodeDef.name().c_str());
+
+    IOutputSlot& prevLayerOutputSlot = inputs[0].m_IndexedValue->ResolveArmnnOutputSlot(inputs[0].m_Index);
+    prevLayerOutputSlot.Connect(layer->GetInputSlot(0));
+    layer->GetOutputSlot(0).SetTensorInfo(prevLayerOutputSlot.GetTensorInfo());
+
+    return std::make_unique<SingleLayerParsedTfOperation>(this, nodeDef, layer);
+}
+
 ParsedTfOperationPtr TfParser::ParseSoftmax(const tensorflow::NodeDef& nodeDef,
     const tensorflow::GraphDef& graphDef)
 {
diff --git a/src/armnnTfParser/TfParser.hpp b/src/armnnTfParser/TfParser.hpp
index b8fab41..4421768 100644
--- a/src/armnnTfParser/TfParser.hpp
+++ b/src/armnnTfParser/TfParser.hpp
@@ -147,6 +147,7 @@ private:
     ParsedTfOperationPtr ParseRelu6(const tensorflow::NodeDef& nodeDef, const tensorflow::GraphDef& graphDef);
     ParsedTfOperationPtr ParseReshape(const tensorflow::NodeDef& nodeDef, const tensorflow::GraphDef& graphDef);
     ParsedTfOperationPtr ParseResizeBilinear(const tensorflow::NodeDef& nodeDef, const tensorflow::GraphDef& graphDef);
+    ParsedTfOperationPtr ParseRsqrt(const tensorflow::NodeDef& nodeDef, const tensorflow::GraphDef& graphDef);
     ParsedTfOperationPtr ParseShape(const tensorflow::NodeDef& nodeDef, const tensorflow::GraphDef& graphDef);
     ParsedTfOperationPtr ParseSqueeze(const tensorflow::NodeDef& nodeDef, const tensorflow::GraphDef& graphDef);
     ParsedTfOperationPtr ParseSigmoid(const tensorflow::NodeDef& nodeDef, const tensorflow::GraphDef& graphDef);
diff --git a/src/armnnTfParser/test/Rsqrt.cpp b/src/armnnTfParser/test/Rsqrt.cpp
new file mode 100644
index 0000000..6924c06
--- /dev/null
+++ b/src/armnnTfParser/test/Rsqrt.cpp
@@ -0,0 +1,59 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include <boost/test/unit_test.hpp>
+#include "armnnTfParser/ITfParser.hpp"
+#include "ParserPrototxtFixture.hpp"
+
+BOOST_AUTO_TEST_SUITE(TensorflowParser)
+
+struct RsqrtFixture : public armnnUtils::ParserPrototxtFixture<armnnTfParser::ITfParser>
+{
+    RsqrtFixture()
+    {
+        m_Prototext = "node {\n"
+                      "  name: \"input\"\n"
+                      "  op: \"Placeholder\"\n"
+                      "  attr {\n"
+                      "    key: \"dtype\"\n"
+                      "    value {\n"
+                      "      type: DT_FLOAT\n"
+                      "    }\n"
+                      "  }\n"
+                      "  attr {\n"
+                      "    key: \"shape\"\n"
+                      "    value {\n"
+                      "      shape {\n"
+                      "      }\n"
+                      "    }\n"
+                      "  }\n"
+                      "}\n"
+                      "node {\n"
+                      "  name: \"Rsqrt\"\n"
+                      "  op: \"Rsqrt\"\n"
+                      "  input: \"input\"\n"
+                      "  attr {\n"
+                      "    key: \"T\"\n"
+                      "    value {\n"
+                      "      type: DT_FLOAT\n"
+                      "    }\n"
+                      "  }\n"
+                      "}\n";
+
+        SetupSingleInputSingleOutput({ 2, 2 }, "input", "Rsqrt");
+    }
+};
+
+BOOST_FIXTURE_TEST_CASE(ParseRsqrt, RsqrtFixture)
+{
+    RunTest<2>({ 1.f, 4.f, 16.f, 25.f }, { 1.f, 0.5f, 0.25f, 0.2f });
+}
+
+BOOST_FIXTURE_TEST_CASE(ParseRsqrtZeroNegative, RsqrtFixture)
+{
+    RunTest<2>({ 0.f, -0.f, -25.f, -16.f }, { INFINITY, -INFINITY, -NAN, -NAN });
+}
+
+BOOST_AUTO_TEST_SUITE_END()
\ No newline at end of file
-- 
2.7.4