From 228afd1fca442b89755262b3832b34e483a94539 Mon Sep 17 00:00:00 2001
From: =?utf8?q?=EC=9C=A4=ED=98=84=EC=8B=9D/On-Device=20Lab=28SR=29/Princip?=
 =?utf8?q?al=20Engineer/=EC=82=BC=EC=84=B1=EC=A0=84=EC=9E=90?=
 <hyunsik.yoon@samsung.com>
Date: Mon, 30 Sep 2019 18:07:15 +0900
Subject: [PATCH] [exo-tflite] converting loco::TensorTranspose to
 locoex::TFLTranspose (#7824)

* [exo-tflite] converter to convert loco::TensorTranspose to locoex::TFLTranspose

A converter to convert loco::TensorTranspose to locoex::TFLTranspose is introduced.

Signed-off-by: Hyun Sik Yoon <hyunsik.yoon@samsung.com>

* adding more validation check + using std::is_permutation(..)
---
 .../src/Conversion/TensorTransposeConverter.cpp    | 100 +++++++++++++++++++++
 .../src/Conversion/TensorTransposeConverter.h      |  41 +++++++++
 2 files changed, 141 insertions(+)
 create mode 100644 compiler/exo-tflite/src/Conversion/TensorTransposeConverter.cpp
 create mode 100644 compiler/exo-tflite/src/Conversion/TensorTransposeConverter.h

diff --git a/compiler/exo-tflite/src/Conversion/TensorTransposeConverter.cpp b/compiler/exo-tflite/src/Conversion/TensorTransposeConverter.cpp
new file mode 100644
index 0000000..40b5502
--- /dev/null
+++ b/compiler/exo-tflite/src/Conversion/TensorTransposeConverter.cpp
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "TensorTransposeConverter.h"
+
+#include "Dialect/IR/TFLNodes.h"
+#include "Check.h"
+
+#include <loco.h>
+#include <loco/Service/ShapeInference.h>
+
+#include <algorithm>
+#include <cassert>
+#include <vector>
+
+namespace
+{
+
+void validate_perm(loco::TensorTranspose *origin)
+{
+  // check perm values are correct
+  std::vector<uint32_t> base_perms; // such as {0, 1, 2, 3, ... }
+  std::vector<uint32_t> perms;      // perm values in TensorTranspose
+
+  base_perms.resize(origin->perm()->size());
+  perms.resize(origin->perm()->size());
+  for (loco::TensorAxis x = 0; x < origin->perm()->size(); x++)
+  {
+    base_perms[x] = x;
+    perms[x] = origin->perm()->axis(x);
+  }
+
+  if (!std::is_permutation(base_perms.begin(), base_perms.end(), perms.begin()))
+    EXO_THROW("wrong perm value");
+}
+
+} // namespace
+
+namespace exo
+{
+/**
+ * @brief Converts loco::TensorTranspose to locoex::TFLTranspose
+ */
+bool TensorTransposeConverter::convert(loco::TensorTranspose *origin)
+{
+  auto *graph = origin->graph();
+
+  auto tfl_transpose = graph->nodes()->create<locoex::TFLTranspose>();
+  {
+    // validation
+    {
+      assert(origin->input() != nullptr);
+
+      auto input_rank = loco::shape_get(origin->input()).as<loco::TensorShape>().rank();
+      if (input_rank != origin->perm()->size())
+        EXO_THROW("perm size should be same with input rank");
+
+      validate_perm(origin);
+    }
+
+    tfl_transpose->a(origin->input());
+
+    // perm : set TFLConst
+    auto perm_const = graph->nodes()->create<locoex::TFLConst>();
+    {
+      perm_const->dtype(loco::DataType::S32);
+      perm_const->rank(1);
+      perm_const->dim(0) = origin->perm()->size();
+      perm_const->size<loco::DataType::S32>(origin->perm()->size());
+
+      // add perm values into perm TFLConst
+      for (loco::TensorAxis x = 0; x < origin->perm()->size(); x++)
+      {
+        perm_const->at<loco::DataType::S32>(x) = origin->perm()->axis(x);
+      }
+    }
+    tfl_transpose->perm(perm_const);
+  }
+
+  // replace canonical node
+  loco::replace(origin).with(tfl_transpose);
+  origin->input(nullptr);
+
+  return true;
+}
+
+} // namespace exo
diff --git a/compiler/exo-tflite/src/Conversion/TensorTransposeConverter.h b/compiler/exo-tflite/src/Conversion/TensorTransposeConverter.h
new file mode 100644
index 0000000..9b61ff3
--- /dev/null
+++ b/compiler/exo-tflite/src/Conversion/TensorTransposeConverter.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __CONVERSION_TENSORTRANSPOSE_CONVERTER__
+#define __CONVERSION_TENSORTRANSPOSE_CONVERTER__
+
+#include "CanonicalNodeConverter.h"
+
+#include <loco.h>
+
+namespace exo
+{
+
+/**
+ * @brief  Convert loco::TensorTranspose to locoex::TFLTranspose
+ */
+class TensorTransposeConverter : public CanonicalNodeConverter<loco::TensorTranspose>
+{
+public:
+  const char *name(void) const final { return "exo::TensorTransposeConverter"; }
+
+public:
+  bool convert(loco::TensorTranspose *origin) final;
+};
+
+} // namespace exo
+
+#endif // __CONVERSION_TENSORTRANSPOSE_CONVERTER__
-- 
2.7.4