From f0fce5be82fa35ee816945b557561854e7bde7c0 Mon Sep 17 00:00:00 2001
From: Teresa Charlin <teresa.charlinreyes@arm.com>
Date: Wed, 4 May 2022 17:24:43 +0100
Subject: IVGCVSW-6936 Add SQRT support to tflite parser

Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>
Change-Id: I3b1f44c10a3446cfe45a7757d8a98e9788ec5dc0
---
 docs/05_01_parsers.dox                          |  1 +
 src/armnnTfLiteParser/TfLiteParser.cpp          |  6 ++++++
 src/armnnTfLiteParser/TfLiteParser.hpp          |  1 +
 src/armnnTfLiteParser/test/ElementWiseUnary.cpp | 13 +++++++++++++
 4 files changed, 21 insertions(+)

diff --git a/docs/05_01_parsers.dox b/docs/05_01_parsers.dox
index 03f2cba8d4..8e406e85cf 100644
--- a/docs/05_01_parsers.dox
+++ b/docs/05_01_parsers.dox
@@ -176,6 +176,7 @@ The Arm NN SDK TensorFlow Lite parser currently supports the following operators
 - SPLIT
 - SPLIT_V
 - SQUEEZE
+- SQRT
 - STRIDED_SLICE
 - SUB
 - SUM
diff --git a/src/armnnTfLiteParser/TfLiteParser.cpp b/src/armnnTfLiteParser/TfLiteParser.cpp
index 32b7c63fbb..7fe954d901 100644
--- a/src/armnnTfLiteParser/TfLiteParser.cpp
+++ b/src/armnnTfLiteParser/TfLiteParser.cpp
@@ -730,6 +730,7 @@ TfLiteParserImpl::TfLiteParserImpl(const Optional<ITfLiteParser::TfLiteParserOpt
     m_ParserFunctions[tflite::BuiltinOperator_RESIZE_BILINEAR]         = &TfLiteParserImpl::ParseResizeBilinear;
     m_ParserFunctions[tflite::BuiltinOperator_RESIZE_NEAREST_NEIGHBOR] = &TfLiteParserImpl::ParseResizeNearestNeighbor;
     m_ParserFunctions[tflite::BuiltinOperator_RSQRT]                   = &TfLiteParserImpl::ParseRsqrt;
+    m_ParserFunctions[tflite::BuiltinOperator_SQRT]                    = &TfLiteParserImpl::ParseSqrt;
     m_ParserFunctions[tflite::BuiltinOperator_SHAPE]                   = &TfLiteParserImpl::ParseShape;
     m_ParserFunctions[tflite::BuiltinOperator_SLICE]                   = &TfLiteParserImpl::ParseSlice;
     m_ParserFunctions[tflite::BuiltinOperator_SOFTMAX]                 = &TfLiteParserImpl::ParseSoftmax;
@@ -4180,6 +4181,11 @@ void TfLiteParserImpl::ParseRsqrt(size_t subgraphIndex, size_t operatorIndex)
     ParseElementwiseUnary(subgraphIndex, operatorIndex, armnn::UnaryOperation::Rsqrt);
 }
 
+void TfLiteParserImpl::ParseSqrt(size_t subgraphIndex, size_t operatorIndex)
+{
+    ParseElementwiseUnary(subgraphIndex, operatorIndex, armnn::UnaryOperation::Sqrt);
+}
+
 void TfLiteParserImpl::ParseElementwiseUnary(size_t subgraphIndex, size_t operatorIndex, UnaryOperation unaryOperation)
 {
     CHECK_MODEL(m_Model, subgraphIndex, operatorIndex);
diff --git a/src/armnnTfLiteParser/TfLiteParser.hpp b/src/armnnTfLiteParser/TfLiteParser.hpp
index 6a8992fc0f..3fc72057c7 100644
--- a/src/armnnTfLiteParser/TfLiteParser.hpp
+++ b/src/armnnTfLiteParser/TfLiteParser.hpp
@@ -174,6 +174,7 @@ private:
     void ParseShape(size_t subgraphIndex, size_t operatorIndex);
     void ParseSlice(size_t subgraphIndex, size_t operatorIndex);
     void ParseSoftmax(size_t subgraphIndex, size_t operatorIndex);
+    void ParseSqrt(size_t subgraphIndex, size_t operatorIndex);
     void ParseSpaceToBatchND(size_t subgraphIndex, size_t operatorIndex);
     void ParseSplit(size_t subgraphIndex, size_t operatorIndex);
     void ParseSplitV(size_t subgraphIndex, size_t operatorIndex);
diff --git a/src/armnnTfLiteParser/test/ElementWiseUnary.cpp b/src/armnnTfLiteParser/test/ElementWiseUnary.cpp
index 2d784fb022..bab9a05bd2 100644
--- a/src/armnnTfLiteParser/test/ElementWiseUnary.cpp
+++ b/src/armnnTfLiteParser/test/ElementWiseUnary.cpp
@@ -141,4 +141,17 @@ TEST_CASE_FIXTURE(SimpleRsqrtFixture, "ParseRsqrt")
                                                                 0.2f, 0.125f, 0.1f} }});
 }
 
+struct SimpleSqrtFixture : public ElementWiseUnaryFixture
+{
+    SimpleSqrtFixture() : ElementWiseUnaryFixture("SQRT", "FLOAT32", "[ 1, 2, 3, 1 ]", "[ 1, 2, 3, 1 ]") {}
+};
+
+TEST_CASE_FIXTURE(SimpleSqrtFixture, "ParseSqrt")
+{
+    RunTest<4, armnn::DataType::Float32>(0, {{ "inputTensor", { 9.0f, 4.0f, 16.0f,
+                                                                25.0f, 36.0f, 49.0f } }},
+                                         {{ "outputTensor",{ 3.0f, 2.0f, 4.0f,
+                                                             5.0f, 6.0f, 7.0f} }});
+}
+
 }
-- 
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