Add basic definition of augmentation class

Author: kartikdutt18

CMakeLists.txt

@@ -164,6 +164,7 @@ find_package(Boost 1.49
     COMPONENTS
       filesystem
       system
+      regex
       program_options
       serialization
       unit_test_framework

augmentation/CMakeLists.txt

@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
+project(augmentation)
+
+option(DEBUG "DEBUG" OFF)
+
+set(DIR_SRCS ${CMAKE_CURRENT_SOURCE_DIR}/)
+include_directories("${CMAKE_CURRENT_SOURCE_DIR}/../../")
+
+set(SOURCES
+    augmentation.hpp
+)
+
+foreach(file ${SOURCES})
+  set(DIR_SRCS ${DIR_SRCS} ${CMAKE_CURRENT_SOURCE_DIR}/${file})
+endforeach()
+
+# Append sources (with directory name) to list of all models sources (used at
+# the parent scope).
+set(DIRS ${DIRS} ${DIR_SRCS} PARENT_SCOPE)

augmentation/augmentation.hpp

@@ -0,0 +1,130 @@
+/**
+ * @file augmentation.hpp
+ * @author Kartik Dutt
+ * 
+ * Definition of Augmentation class for augmenting data.
+ *
+ * mlpack is free software; you may redistribute it and/or modify it under the
+ * terms of the 3-clause BSD license.  You should have received a copy of the
+ * 3-clause BSD license along with mlpack.  If not, see
+ * http://www.opensource.org/licenses/BSD-3-Clause for more information.
+ */
+
+#include <mlpack/methods/ann/layer/bilinear_interpolation.hpp>
+#include <boost/regex.hpp>
+
+#ifndef MODELS_AUGMENTATION_HPP
+#define MODELS_AUGMENTATION_HPP
+
+/**
+ * Augmentation class used to perform augmentations / transform the data.
+ * For the list of supported augmentation, take a look at our wiki page.
+ *
+ * @code
+ * Augmentation<> augmentation({"horizontal-flip", "resize = (224, 224)"}, 0.2);
+ * augmentation.Transform(dataloader.TrainFeatures);
+ * @endcode
+ * 
+ * @tparam DatasetX Datatype on which augmentation will be done.
+ */
+class Augmentation
+{
+ public:
+  //! Create the augmenation class object.
+  Augmentation();
+
+  /**
+   * Constructor for augmentation class.
+   *
+   * @param augmentation List of strings containing one of the supported
+   *                     augmentation.
+   * @param augmentationProbability Probability of applying augmentation on
+   *                                the dataset.
+   *                                NOTE : This doesn't apply to augmentations
+   *                                such as resize.
+   * @param batches Boolean to determine if input is a single data point or
+   *                a batch. Defaults to true.
+   *                NOTE : If true, each data point must be represented as a
+   *                seperate column.
+   */
+  Augmentation(const std::vector<std::string>& augmentation,
+               const double augmentationProbability);
+
+  /**
+   */
+  template<typename DatasetType = arma::mat>
+  void Transform(DatasetType& dataset);
+
+  template<typename DatasetType = arma::mat>
+  void ResizeTransform(DatasetType& dataset);
+
+  template <typename DatasetType = arma::mat>
+  void HorizontalFlipTransform(DatasetType &dataset);
+
+  template<typename DatasetType = arma::mat>
+  void VerticalFlipTransform(DatasetType& dataset);
+
+
+ private:
+  /**
+   * Function to determine if augmentation has Resize function.
+   */
+  bool HasResizeParam()
+  {
+    return augmentations.size() <= 0 ? false :
+        augmentations[0].find("resize") != std::string::npos ;
+  }
+
+  /**
+   * Sets size of output width and output height of the new data.
+   *
+   * @param outWidth Output width of resized data point.
+   * @param outHeight Output height of resized data point.
+   */
+  void GetResizeParam(size_t& outWidth, size_t& outHeight)
+  {
+    if (!HasResizeParam())
+    {
+      return;
+    }
+
+    outWidth = -1;
+    outHeight = -1;
+
+    // Use regex to find one / two  numbers. If only one provided
+    // set output width equal to output height.
+    boost::regex regex{"[0-9]+"};
+
+    // Create an iterator to find matches.
+    boost::sregex_token_iterator matches(augmentations[0].begin(),
+        augmentations[0].end(), regex, 0), end;
+
+    size_t matchesCount = std::distance(matches, end);
+
+    if (matchesCount == 0)
+    {
+      mlpack::Log::Fatal << "Invalid size / shape in " <<
+          augmentations[0] << std::endl;
+    }
+
+    if (matchesCount == 1)
+    {
+      outWidth = std::stoi(*matches);
+      outHeight = outWidth;
+    }
+    else
+    {
+      outWidth = std::stoi(*matches);
+      matches++;
+      outHeight = std::stoi(*matches);
+    }
+  }
+
+  //! Locally held augmentations / transforms that need to be applied.
+  std::vector<std::string> augmentations;
+
+  //! Locally held value of augmentation probability.
+  double augmentationProbability;
+};
+
+#endif

tests/CMakeLists.txt

@@ -7,6 +7,7 @@ set(MODEL_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/)
 include_directories("${CMAKE_CURRENT_SOURCE_DIR}/../")
 
 add_executable(models_test
+               augmentation_tests.cpp
                dataloader_tests.cpp
                utils_tests.cpp
 )
@@ -19,6 +20,7 @@ target_link_libraries(models_test
   ${Boost_UNIT_TEST_FRAMEWORK_LIBRARY}
   ${Boost_SYSTEM_LIBRARY}
   ${Boost_SERIALIZATION_LIBRARY}
+  ${Boost_REGEX_LIBRARY}
   ${MLPACK_LIBRARIES}
 )
 

tests/augmentation_tests.cpp

@@ -0,0 +1,28 @@
+/**
+ * @file augmentation.cpp
+ * @author Kartik Dutt
+ *
+ * Tests for various functionalities of utils.
+ *
+ * mlpack is free software; you may redistribute it and/or modify it under the
+ * terms of the 3-clause BSD license.  You should have received a copy of the
+ * 3-clause BSD license along with mlpack.  If not, see
+ * http://www.opensource.org/licenses/BSD-3-Clause for more information.
+ */
+#define BOOST_TEST_DYN_LINK
+#include <boost/regex.hpp>
+#include <boost/test/unit_test.hpp>
+using namespace boost::unit_test;
+
+BOOST_AUTO_TEST_SUITE(AugmentationTest);
+
+BOOST_AUTO_TEST_CASE(REGEXTest)
+{
+  std::string s = " resize = {  19,    112 }, resize : 133,442, resize = [12 213]";
+  boost::regex expr{"[0-9]+"};
+  boost::smatch what;
+  boost::sregex_token_iterator iter(s.begin(), s.end(), expr, 0);
+  boost::sregex_token_iterator end;
+}
+
+BOOST_AUTO_TEST_SUITE_END();