COMPMID-363 Add Graph library support

Change-Id: Ie841419bf65d0e06bdfe0bdd2d8d4e0bb3631e54
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/87931
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>

4 files changed, 932 insertions, 0 deletions

diff --git a/utils/GraphUtils.cpp b/utils/GraphUtils.cpp
new file mode 100644
index 0000000000..d763606867
--- /dev/null
+++ b/utils/GraphUtils.cpp
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "utils/GraphUtils.h"
+#include "utils/Utils.h"
+
+#ifdef ARM_COMPUTE_CL
+#include "arm_compute/core/CL/OpenCL.h"
+#include "arm_compute/runtime/CL/CLTensor.h"
+#endif /* ARM_COMPUTE_CL */
+
+#include "arm_compute/core/Error.h"
+#include "libnpy/npy.hpp"
+
+#include <sstream>
+
+using namespace arm_compute::graph_utils;
+
+PPMWriter::PPMWriter(std::string name, unsigned int maximum)
+    : _name(std::move(name)), _iterator(0), _maximum(maximum)
+{
+}
+
+bool PPMWriter::access_tensor(ITensor &tensor)
+{
+    std::stringstream ss;
+    ss << _name << _iterator << ".ppm";
+    if(dynamic_cast<Tensor *>(&tensor) != nullptr)
+    {
+        arm_compute::utils::save_to_ppm(dynamic_cast<Tensor &>(tensor), ss.str());
+    }
+#ifdef ARM_COMPUTE_CL
+    else if(dynamic_cast<CLTensor *>(&tensor) != nullptr)
+    {
+        arm_compute::utils::save_to_ppm(dynamic_cast<CLTensor &>(tensor), ss.str());
+    }
+#endif /* ARM_COMPUTE_CL */
+
+    _iterator++;
+    if(_maximum == 0)
+    {
+        return true;
+    }
+    return _iterator < _maximum;
+}
+
+DummyAccessor::DummyAccessor(unsigned int maximum)
+    : _iterator(0), _maximum(maximum)
+{
+}
+
+bool DummyAccessor::access_tensor(ITensor &tensor)
+{
+    ARM_COMPUTE_UNUSED(tensor);
+    bool ret = _maximum == 0 || _iterator < _maximum;
+    if(_iterator == _maximum)
+    {
+        _iterator = 0;
+    }
+    else
+    {
+        _iterator++;
+    }
+    return ret;
+}
+
+NumPyBinLoader::NumPyBinLoader(std::string filename)
+    : _filename(std::move(filename))
+{
+}
+
+bool NumPyBinLoader::access_tensor(ITensor &tensor)
+{
+    const TensorShape          tensor_shape = tensor.info()->tensor_shape();
+    std::vector<unsigned long> shape;
+
+    // Open file
+    std::ifstream stream(_filename, std::ios::in | std::ios::binary);
+    ARM_COMPUTE_ERROR_ON_MSG(!stream.good(), "Failed to load binary data");
+    // Check magic bytes and version number
+    unsigned char v_major = 0;
+    unsigned char v_minor = 0;
+    npy::read_magic(stream, &v_major, &v_minor);
+
+    // Read header
+    std::string header;
+    if(v_major == 1 && v_minor == 0)
+    {
+        header = npy::read_header_1_0(stream);
+    }
+    else if(v_major == 2 && v_minor == 0)
+    {
+        header = npy::read_header_2_0(stream);
+    }
+    else
+    {
+        ARM_COMPUTE_ERROR("Unsupported file format version");
+    }
+
+    // Parse header
+    bool        fortran_order = false;
+    std::string typestr;
+    npy::ParseHeader(header, typestr, &fortran_order, shape);
+
+    // Check if the typestring matches the given one
+    std::string expect_typestr = arm_compute::utils::get_typestring(tensor.info()->data_type());
+    ARM_COMPUTE_ERROR_ON_MSG(typestr != expect_typestr, "Typestrings mismatch");
+
+    // Validate tensor shape
+    ARM_COMPUTE_ERROR_ON_MSG(shape.size() != tensor_shape.num_dimensions(), "Tensor ranks mismatch");
+    if(fortran_order)
+    {
+        for(size_t i = 0; i < shape.size(); ++i)
+        {
+            ARM_COMPUTE_ERROR_ON_MSG(tensor_shape[i] != shape[i], "Tensor dimensions mismatch");
+        }
+    }
+    else
+    {
+        for(size_t i = 0; i < shape.size(); ++i)
+        {
+            ARM_COMPUTE_ERROR_ON_MSG(tensor_shape[i] != shape[shape.size() - i - 1], "Tensor dimensions mismatch");
+        }
+    }
+
+    // Read data
+    if(tensor.info()->padding().empty())
+    {
+        // If tensor has no padding read directly from stream.
+        stream.read(reinterpret_cast<char *>(tensor.buffer()), tensor.info()->total_size());
+    }
+    else
+    {
+        // If tensor has padding accessing tensor elements through execution window.
+        Window window;
+        window.use_tensor_dimensions(tensor_shape);
+
+        execute_window_loop(window, [&](const Coordinates & id)
+        {
+            stream.read(reinterpret_cast<char *>(tensor.ptr_to_element(id)), tensor.info()->element_size());
+        });
+    }
+    return true;
+}
diff --git a/utils/GraphUtils.h b/utils/GraphUtils.h
new file mode 100644
index 0000000000..a19f7e510d
--- /dev/null
+++ b/utils/GraphUtils.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_GRAPH_UTILS_H__
+#define __ARM_COMPUTE_GRAPH_UTILS_H__
+
+#include "arm_compute/graph/ITensorAccessor.h"
+#include "arm_compute/graph/Types.h"
+
+namespace arm_compute
+{
+namespace graph_utils
+{
+/** PPM writer class */
+class PPMWriter : public graph::ITensorAccessor
+{
+public:
+    /** Constructor
+     *
+     * @param[in] name    PPM file name
+     * @param[in] maximum Maximum elements to access
+     */
+    PPMWriter(std::string name, unsigned int maximum = 1);
+    /** Allows instances to move constructed */
+    PPMWriter(PPMWriter &&) = default;
+
+    // Inherited methods overriden:
+    bool access_tensor(ITensor &tensor) override;
+
+private:
+    const std::string _name;
+    unsigned int      _iterator;
+    unsigned int      _maximum;
+};
+
+/** Dummy accessor class */
+class DummyAccessor : public graph::ITensorAccessor
+{
+public:
+    /** Constructor
+     *
+     * @param[in] maximum Maximum elements to write
+     */
+    DummyAccessor(unsigned int maximum = 1);
+    /** Allows instances to move constructed */
+    DummyAccessor(DummyAccessor &&) = default;
+
+    // Inherited methods overriden:
+    bool access_tensor(ITensor &tensor) override;
+
+private:
+    unsigned int _iterator;
+    unsigned int _maximum;
+};
+
+/** Numpy Binary loader class*/
+class NumPyBinLoader : public graph::ITensorAccessor
+{
+public:
+    /** Default Constructor
+     *
+     * @param filename Binary file name
+     */
+    NumPyBinLoader(std::string filename);
+    /** Allows instances to move constructed */
+    NumPyBinLoader(NumPyBinLoader &&) = default;
+
+    // Inherited methods overriden:
+    bool access_tensor(ITensor &tensor) override;
+
+private:
+    const std::string _filename;
+};
+} // namespace graph
+} // namespace arm_compute
+
+#endif /* __ARM_COMPUTE_GRAPH_UTILS_H__ */
diff --git a/utils/TypePrinter.h b/utils/TypePrinter.h
new file mode 100644
index 0000000000..30592fff55
--- /dev/null
+++ b/utils/TypePrinter.h
@@ -0,0 +1,619 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_TEST_TYPE_PRINTER_H__
+#define __ARM_COMPUTE_TEST_TYPE_PRINTER_H__
+
+#include "arm_compute/core/Dimensions.h"
+#include "arm_compute/core/Error.h"
+#include "arm_compute/core/Types.h"
+
+#include <ostream>
+#include <sstream>
+#include <string>
+
+namespace arm_compute
+{
+/** Formatted output of the Dimensions type. */
+template <typename T>
+inline ::std::ostream &operator<<(::std::ostream &os, const Dimensions<T> &dimensions)
+{
+    if(dimensions.num_dimensions() > 0)
+    {
+        os << dimensions[0];
+
+        for(unsigned int d = 1; d < dimensions.num_dimensions(); ++d)
+        {
+            os << "x" << dimensions[d];
+        }
+    }
+
+    return os;
+}
+
+/** Formatted output of the NonLinearFilterFunction type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const NonLinearFilterFunction &function)
+{
+    switch(function)
+    {
+        case NonLinearFilterFunction::MAX:
+            os << "MAX";
+            break;
+        case NonLinearFilterFunction::MEDIAN:
+            os << "MEDIAN";
+            break;
+        case NonLinearFilterFunction::MIN:
+            os << "MIN";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+inline std::string to_string(const NonLinearFilterFunction &function)
+{
+    std::stringstream str;
+    str << function;
+    return str.str();
+}
+
+/** Formatted output of the MatrixPattern type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const MatrixPattern &pattern)
+{
+    switch(pattern)
+    {
+        case MatrixPattern::BOX:
+            os << "BOX";
+            break;
+        case MatrixPattern::CROSS:
+            os << "CROSS";
+            break;
+        case MatrixPattern::DISK:
+            os << "DISK";
+            break;
+        case MatrixPattern::OTHER:
+            os << "OTHER";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+inline std::string to_string(const MatrixPattern &pattern)
+{
+    std::stringstream str;
+    str << pattern;
+    return str.str();
+}
+
+/** Formatted output of the RoundingPolicy type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const RoundingPolicy &rounding_policy)
+{
+    switch(rounding_policy)
+    {
+        case RoundingPolicy::TO_ZERO:
+            os << "TO_ZERO";
+            break;
+        case RoundingPolicy::TO_NEAREST_UP:
+            os << "TO_NEAREST_UP";
+            break;
+        case RoundingPolicy::TO_NEAREST_EVEN:
+            os << "TO_NEAREST_EVEN";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+/** Formatted output of the WeightsInfo type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const WeightsInfo &weights_info)
+{
+    os << weights_info.are_reshaped() << ";";
+    os << weights_info.num_kernels() << ";" << weights_info.kernel_size().first << "," << weights_info.kernel_size().second;
+
+    return os;
+}
+
+/** Formatted output of the ROIPoolingInfo type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const ROIPoolingLayerInfo &pool_info)
+{
+    os << pool_info.pooled_width() << "x" << pool_info.pooled_height() << "~" << pool_info.spatial_scale();
+    return os;
+}
+
+/** Formatted output of the activation function type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const ActivationLayerInfo::ActivationFunction &act_function)
+{
+    switch(act_function)
+    {
+        case ActivationLayerInfo::ActivationFunction::ABS:
+            os << "ABS";
+            break;
+        case ActivationLayerInfo::ActivationFunction::LINEAR:
+            os << "LINEAR";
+            break;
+        case ActivationLayerInfo::ActivationFunction::LOGISTIC:
+            os << "LOGISTIC";
+            break;
+        case ActivationLayerInfo::ActivationFunction::RELU:
+            os << "RELU";
+            break;
+        case ActivationLayerInfo::ActivationFunction::BOUNDED_RELU:
+            os << "BOUNDED_RELU";
+            break;
+        case ActivationLayerInfo::ActivationFunction::LEAKY_RELU:
+            os << "LEAKY_RELU";
+            break;
+        case ActivationLayerInfo::ActivationFunction::SOFT_RELU:
+            os << "SOFT_RELU";
+            break;
+        case ActivationLayerInfo::ActivationFunction::SQRT:
+            os << "SQRT";
+            break;
+        case ActivationLayerInfo::ActivationFunction::LU_BOUNDED_RELU:
+            os << "LU_BOUNDED_RELU";
+        case ActivationLayerInfo::ActivationFunction::SQUARE:
+            os << "SQUARE";
+            break;
+        case ActivationLayerInfo::ActivationFunction::TANH:
+            os << "TANH";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+inline std::string to_string(const arm_compute::ActivationLayerInfo &info)
+{
+    std::stringstream str;
+    str << info.activation();
+    return str.str();
+}
+
+inline std::string to_string(const arm_compute::ActivationLayerInfo::ActivationFunction &function)
+{
+    std::stringstream str;
+    str << function;
+    return str.str();
+}
+
+/** Formatted output of the NormType type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const NormType &norm_type)
+{
+    switch(norm_type)
+    {
+        case NormType::CROSS_MAP:
+            os << "CROSS_MAP";
+            break;
+        case NormType::IN_MAP_1D:
+            os << "IN_MAP_1D";
+            break;
+        case NormType::IN_MAP_2D:
+            os << "IN_MAP_2D";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+inline std::string to_string(const arm_compute::NormalizationLayerInfo &info)
+{
+    std::stringstream str;
+    str << info.type();
+    return str.str();
+}
+
+/** Formatted output of the PoolingType type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const PoolingType &pool_type)
+{
+    switch(pool_type)
+    {
+        case PoolingType::AVG:
+            os << "AVG";
+            break;
+        case PoolingType::MAX:
+            os << "MAX";
+            break;
+        case PoolingType::L2:
+            os << "L2";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+/** Formatted output of @ref PoolingLayerInfo. */
+inline ::std::ostream &operator<<(::std::ostream &os, const PoolingLayerInfo &info)
+{
+    os << info.pool_type();
+
+    return os;
+}
+
+/** Formatted output of the DataType type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const DataType &data_type)
+{
+    switch(data_type)
+    {
+        case DataType::UNKNOWN:
+            os << "UNKNOWN";
+            break;
+        case DataType::U8:
+            os << "U8";
+            break;
+        case DataType::QS8:
+            os << "QS8";
+            break;
+        case DataType::S8:
+            os << "S8";
+            break;
+        case DataType::U16:
+            os << "U16";
+            break;
+        case DataType::S16:
+            os << "S16";
+            break;
+        case DataType::QS16:
+            os << "QS16";
+            break;
+        case DataType::U32:
+            os << "U32";
+            break;
+        case DataType::S32:
+            os << "S32";
+            break;
+        case DataType::U64:
+            os << "U64";
+            break;
+        case DataType::S64:
+            os << "S64";
+            break;
+        case DataType::F16:
+            os << "F16";
+            break;
+        case DataType::F32:
+            os << "F32";
+            break;
+        case DataType::F64:
+            os << "F64";
+            break;
+        case DataType::SIZET:
+            os << "SIZET";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+inline std::string to_string(const arm_compute::DataType &data_type)
+{
+    std::stringstream str;
+    str << data_type;
+    return str.str();
+}
+
+/** Formatted output of the Format type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const Format &format)
+{
+    switch(format)
+    {
+        case Format::UNKNOWN:
+            os << "UNKNOWN";
+            break;
+        case Format::U8:
+            os << "U8";
+            break;
+        case Format::S16:
+            os << "S16";
+            break;
+        case Format::U16:
+            os << "U16";
+            break;
+        case Format::S32:
+            os << "S32";
+            break;
+        case Format::U32:
+            os << "U32";
+            break;
+        case Format::F16:
+            os << "F16";
+            break;
+        case Format::F32:
+            os << "F32";
+            break;
+        case Format::UV88:
+            os << "UV88";
+            break;
+        case Format::RGB888:
+            os << "RGB888";
+            break;
+        case Format::RGBA8888:
+            os << "RGBA8888";
+            break;
+        case Format::YUV444:
+            os << "YUV444";
+            break;
+        case Format::YUYV422:
+            os << "YUYV422";
+            break;
+        case Format::NV12:
+            os << "NV12";
+            break;
+        case Format::NV21:
+            os << "NV21";
+            break;
+        case Format::IYUV:
+            os << "IYUV";
+            break;
+        case Format::UYVY422:
+            os << "UYVY422";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+/** Formatted output of the Channel type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const Channel &channel)
+{
+    switch(channel)
+    {
+        case Channel::UNKNOWN:
+            os << "UNKNOWN";
+            break;
+        case Channel::C0:
+            os << "C0";
+            break;
+        case Channel::C1:
+            os << "C1";
+            break;
+        case Channel::C2:
+            os << "C2";
+            break;
+        case Channel::C3:
+            os << "C3";
+            break;
+        case Channel::R:
+            os << "R";
+            break;
+        case Channel::G:
+            os << "G";
+            break;
+        case Channel::B:
+            os << "B";
+            break;
+        case Channel::A:
+            os << "A";
+            break;
+        case Channel::Y:
+            os << "Y";
+            break;
+        case Channel::U:
+            os << "U";
+            break;
+        case Channel::V:
+            os << "V";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+/** Formatted output of the BorderMode type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const BorderMode &mode)
+{
+    switch(mode)
+    {
+        case BorderMode::UNDEFINED:
+            os << "UNDEFINED";
+            break;
+        case BorderMode::CONSTANT:
+            os << "CONSTANT";
+            break;
+        case BorderMode::REPLICATE:
+            os << "REPLICATE";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+/** Formatted output of the BorderSize type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const BorderSize &border)
+{
+    os << border.top << ","
+       << border.right << ","
+       << border.bottom << ","
+       << border.left;
+
+    return os;
+}
+
+/** Formatted output of the InterpolationPolicy type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const InterpolationPolicy &policy)
+{
+    switch(policy)
+    {
+        case InterpolationPolicy::NEAREST_NEIGHBOR:
+            os << "NEAREST_NEIGHBOR";
+            break;
+        case InterpolationPolicy::BILINEAR:
+            os << "BILINEAR";
+            break;
+        case InterpolationPolicy::AREA:
+            os << "AREA";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+//FIXME: Check why this doesn't work and the TensorShape overload is needed
+template <typename T>
+inline std::string to_string(const Dimensions<T> &dimensions)
+{
+    std::stringstream str;
+    str << dimensions;
+    return str.str();
+}
+
+/** Formatted output of the TensorShape type. */
+inline std::string to_string(const TensorShape &shape)
+{
+    std::stringstream str;
+    str << shape;
+    return str.str();
+}
+
+/** Formatted output of the Rectangle type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const Rectangle &rect)
+{
+    os << rect.width << "x" << rect.height;
+    os << "+" << rect.x << "+" << rect.y;
+
+    return os;
+}
+
+/** Formatted output of the PadStridInfo type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const PadStrideInfo &pad_stride_info)
+{
+    os << pad_stride_info.stride().first << "," << pad_stride_info.stride().second;
+    os << ";";
+    os << pad_stride_info.pad().first << "," << pad_stride_info.pad().second;
+
+    return os;
+}
+
+inline std::string to_string(const PadStrideInfo &pad_stride_info)
+{
+    std::stringstream str;
+    str << pad_stride_info;
+    return str.str();
+}
+
+inline std::string to_string(const BorderMode &mode)
+{
+    std::stringstream str;
+    str << mode;
+    return str.str();
+}
+
+inline std::string to_string(const InterpolationPolicy &policy)
+{
+    std::stringstream str;
+    str << policy;
+    return str.str();
+}
+
+/** Formatted output of the ConversionPolicy type. */
+inline ::std::ostream &operator<<(::std::ostream &os, const ConvertPolicy &policy)
+{
+    switch(policy)
+    {
+        case ConvertPolicy::WRAP:
+            os << "WRAP";
+            break;
+        case ConvertPolicy::SATURATE:
+            os << "SATURATE";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+inline std::string to_string(const ConvertPolicy &policy)
+{
+    std::stringstream str;
+    str << policy;
+    return str.str();
+}
+
+/** Formatted output of the Reduction Operations. */
+inline ::std::ostream &operator<<(::std::ostream &os, const ReductionOperation &op)
+{
+    switch(op)
+    {
+        case ReductionOperation::SUM_SQUARE:
+            os << "SUM_SQUARE";
+            break;
+        default:
+            ARM_COMPUTE_ERROR("NOT_SUPPORTED!");
+    }
+
+    return os;
+}
+
+inline std::string to_string(const ReductionOperation &op)
+{
+    std::stringstream str;
+    str << op;
+    return str.str();
+}
+
+inline std::string to_string(const NormType &type)
+{
+    std::stringstream str;
+    str << type;
+    return str.str();
+}
+
+inline std::string to_string(const PoolingType &type)
+{
+    std::stringstream str;
+    str << type;
+    return str.str();
+}
+
+inline std::string to_string(const PoolingLayerInfo &info)
+{
+    std::stringstream str;
+    str << info.pool_type();
+    return str.str();
+}
+
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_TEST_TYPE_PRINTER_H__ */
diff --git a/utils/Utils.h b/utils/Utils.h
index d535124598..47a352e905 100644
--- a/utils/Utils.h
+++ b/utils/Utils.h
@@ -30,6 +30,7 @@
 #include "arm_compute/core/Validate.h"
 #include "arm_compute/core/Window.h"
 #include "arm_compute/runtime/Tensor.h"
+#include "support/ToolchainSupport.h"
 
 #ifdef ARM_COMPUTE_CL
 #include "arm_compute/core/CL/OpenCL.h"
@@ -401,6 +402,56 @@ void load_trained_data(T &tensor, const std::string &filename)
     }
 }
 
+/** Obtain numpy type string from DataType.
+ *
+ * @param[in] data_type Data type.
+ *
+ * @return numpy type string.
+ */
+inline std::string get_typestring(DataType data_type)
+{
+    // Check endianness
+    const unsigned int i = 1;
+    const char        *c = reinterpret_cast<const char *>(&i);
+    std::string        endianness;
+    if(*c == 1)
+    {
+        endianness = std::string("<");
+    }
+    else
+    {
+        endianness = std::string(">");
+    }
+    const std::string no_endianness("|");
+
+    switch(data_type)
+    {
+        case DataType::U8:
+            return no_endianness + "u" + support::cpp11::to_string(sizeof(uint8_t));
+        case DataType::S8:
+            return no_endianness + "i" + support::cpp11::to_string(sizeof(int8_t));
+        case DataType::U16:
+            return endianness + "u" + support::cpp11::to_string(sizeof(uint16_t));
+        case DataType::S16:
+            return endianness + "i" + support::cpp11::to_string(sizeof(int16_t));
+        case DataType::U32:
+            return endianness + "u" + support::cpp11::to_string(sizeof(uint32_t));
+        case DataType::S32:
+            return endianness + "i" + support::cpp11::to_string(sizeof(int32_t));
+        case DataType::U64:
+            return endianness + "u" + support::cpp11::to_string(sizeof(uint64_t));
+        case DataType::S64:
+            return endianness + "i" + support::cpp11::to_string(sizeof(int64_t));
+        case DataType::F32:
+            return endianness + "f" + support::cpp11::to_string(sizeof(float));
+        case DataType::F64:
+            return endianness + "f" + support::cpp11::to_string(sizeof(double));
+        case DataType::SIZET:
+            return endianness + "u" + support::cpp11::to_string(sizeof(size_t));
+        default:
+            ARM_COMPUTE_ERROR("NOT SUPPORTED!");
+    }
+}
 } // namespace utils
 } // namespace arm_compute
 #endif /* __UTILS_UTILS_H__*/