Added Flatten layer implementation

modules/dnn/src/layers/flatten_layer.cpp

+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+//  By downloading, copying, installing or using the software you agree to this license.
+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+//
+//                           License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of the copyright holders may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+
+#include "../precomp.hpp"
+#include "layers_common.hpp"
+#include "flatten_layer.hpp"
+#include <float.h>
+#include <algorithm>
+
+namespace cv
+{
+namespace dnn
+{
+
+void FlattenLayer::checkParameter(const LayerParams &params, const string &parameterName)
+{
+    if (!params.has(parameterName))
+    {
+        CV_Error(Error::StsBadArg, "Flatten layer parameter does not contain " + parameterName + " index.");
+    }
+}
+
+FlattenLayer::FlattenLayer(LayerParams &params) : Layer(params)
+{
+    checkParameter(params, "start_axis");
+    checkParameter(params, "end_axis");
+
+    _startAxis = params.start_axis;
+
+    if(params.end_axis > 0)
+    {
+        _endAxis = params.end_axis;
+    }
+    else
+    {
+        _endAxis = _num_axes + params.end_axis;
+    }
+}
+
+void FlattenLayer::checkInputs(const std::vector<Blob*> &inputs)
+{
+    CV_Assert(inputs.size() > 0);
+    for (size_t i = 0; i < inputs.size(); i++)
+    {
+        for (size_t j = 0; j < _num_axes; j++)
+        {
+            CV_Assert(inputs[i]->shape[j] == inputs[0]->shape[j]);
+        }
+    }
+}
+
+void FlattenLayer::allocate(const std::vector<Blob*> &inputs, std::vector<Blob> &outputs)
+{
+    checkInputs(inputs);
+
+    size_t flattenedDimensionSize = 1;
+    for (size_t i = _startAxis; i <= _endAxis; i++)
+    {
+        flattenedDimensionSize *= inputs[0]->shape()[i];
+    }
+
+    BlobShape outputShape;
+    size_t interval = _endAxis - _startAxis;
+
+    // imitate flexible number of axes: make first dimension sizes = 1
+    for (size_t i = 0; i < interval; i++)
+    {
+        outputShape[i] = 1;
+    }
+    for (size_t i = interval; i < _endAxis; i++)
+    {
+        outputShape[i] = inputs[0]->shape()[i - interval];
+    }
+    outputShape[_endAxis] = flattenedDimensionSize;
+    for (size_t i = _endAxis + 1; i < _num_axes; i++)
+    {
+        outputShape[i] = inputs[0]->shape()[i];
+    }
+
+    for (size_t i = 0; i < inputs.size(); i++)
+    {
+        outputs[i].create(BlobShape(outputShape));
+    }
+}
+
+void FlattenLayer::forward(std::vector<Blob*> &inputs, std::vector<Blob> &outputs)
+{
+    for (size_t j = 0; j < inputs.size(); j++)
+    {
+        float *srcData = inputs[j]->ptrf();
+        float *dstData = outputs[j]->ptrf();
+
+        dstData = srcData;
+    }
+}
+}
+}

modules/dnn/src/layers/flatten_layer.hpp

+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+//  By downloading, copying, installing or using the software you agree to this license.
+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+//
+//                           License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of the copyright holders may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+
+#ifndef __OPENCV_DNN_LAYERS_FLATTEN_LAYER_HPP__
+#define __OPENCV_DNN_LAYERS_FLATTEN_LAYER_HPP__
+#include "../precomp.hpp"
+
+namespace cv
+{
+namespace dnn
+{
+class FlattenLayer : public Layer
+{
+    size_t _startAxis;
+    size_t _endAxis;
+
+    static const size_t _num_axes = 4;
+
+public:
+    FlattenLayer(LayerParams &params);
+    void allocate(const std::vector<Blob*> &inputs, std::vector<Blob> &outputs);
+    void forward(std::vector<Blob*> &inputs, std::vector<Blob> &outputs);
+    void checkParameter(const LayerParams &params, const string &parameterName);
+    void checkInputs(const std::vector<Blob*> &inputs);
+};
+}
+}
+#endif