COMPMID-2452: Add mnist example

* Add small-mnist example
* Add PrintAccessor
* Add DequantizationLayer graph node

Change-Id: I7bc8011e5a602f40fa3c47b231a2a69c804e78c2
Signed-off-by: Isabella Gottardi <isabella.gottardi@arm.com>
Reviewed-on: https://review.mlplatform.org/c/2274
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Giorgio Arena <giorgio.arena@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>

2 files changed, 51 insertions, 0 deletions

diff --git a/utils/GraphUtils.cpp b/utils/GraphUtils.cpp
index e07e26f2fd..71bfc372fe 100644
--- a/utils/GraphUtils.cpp
+++ b/utils/GraphUtils.cpp
@@ -223,6 +223,19 @@ bool NumPyAccessor::access_tensor(ITensor &tensor)
     return false;
 }
 
+#ifdef ARM_COMPUTE_ASSERTS_ENABLED
+PrintAccessor::PrintAccessor(std::ostream &output_stream, IOFormatInfo io_fmt)
+    : _output_stream(output_stream), _io_fmt(io_fmt)
+{
+}
+
+bool PrintAccessor::access_tensor(ITensor &tensor)
+{
+    tensor.print(_output_stream, _io_fmt);
+    return false;
+}
+#endif /* ARM_COMPUTE_ASSERTS_ENABLED */
+
 SaveNumPyAccessor::SaveNumPyAccessor(std::string npy_name, const bool is_fortran)
     : _npy_name(std::move(npy_name)), _is_fortran(is_fortran)
 {
diff --git a/utils/GraphUtils.h b/utils/GraphUtils.h
index bc0822cc89..d6bae3ea3f 100644
--- a/utils/GraphUtils.h
+++ b/utils/GraphUtils.h
@@ -199,6 +199,33 @@ private:
     const bool        _is_fortran;
 };
 
+/** Print accessor class
+ *  @note The print accessor will print only when asserts are enabled.
+ *  */
+class PrintAccessor final : public graph::ITensorAccessor
+{
+public:
+    /** Constructor
+     *
+     * @param[out] output_stream (Optional) Output stream
+     * @param[in]  io_fmt        (Optional) Format information
+     */
+    PrintAccessor(std::ostream &output_stream = std::cout, IOFormatInfo io_fmt = IOFormatInfo());
+    /** Allow instances of this class to be move constructed */
+    PrintAccessor(PrintAccessor &&) = default;
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    PrintAccessor(const PrintAccessor &) = delete;
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    PrintAccessor &operator=(const PrintAccessor &) = delete;
+
+    // Inherited methods overriden:
+    bool access_tensor(ITensor &tensor) override;
+
+private:
+    std::ostream &_output_stream;
+    IOFormatInfo  _io_fmt;
+};
+
 /** Image accessor class */
 class ImageAccessor final : public graph::ITensorAccessor
 {
@@ -615,6 +642,17 @@ inline std::unique_ptr<graph::ITensorAccessor> get_save_npy_output_accessor(cons
     }
 }
 
+/** Generates print tensor accessor
+ *
+ * @param[out] output_stream (Optional) Output stream
+ *
+ * @return A print tensor accessor
+ */
+inline std::unique_ptr<graph::ITensorAccessor> get_print_output_accessor(std::ostream &output_stream = std::cout)
+{
+    return arm_compute::support::cpp14::make_unique<PrintAccessor>(output_stream);
+}
+
 /** Permutes a given tensor shape given the input and output data layout
  *
  * @param[in] tensor_shape    Tensor shape to permute