default_param_impl.hpp

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#ifndef MLPACK_BINDINGS_PYTHON_DEFAULT_PARAM_IMPL_HPP
#define MLPACK_BINDINGS_PYTHON_DEFAULT_PARAM_IMPL_HPP

#include "default_param.hpp"

namespace mlpack {
namespace bindings {
namespace python {

template<typename T>
std::string DefaultParamImpl(
    util::ParamData& data,
    const typename std::enable_if<!arma::is_arma_type<T>::value>::type* /* junk */,
    const typename std::enable_if<!util::IsStdVector<T>::value>::type* /* junk */,
    const typename std::enable_if<!data::HasSerialize<T>::value>::type* /* junk */,
    const typename std::enable_if<!std::is_same<T,
        std::string>::value>::type*,
    const typename std::enable_if<!std::is_same<T,
        std::tuple<mlpack::data::DatasetInfo, arma::mat>>::value>::type* /* junk */)
{
  std::ostringstream oss;
  if (std::is_same<T, bool>::value)
    oss << "False";
  else
    oss << boost::any_cast<T>(data.value);

  return oss.str();
}

template<typename T>
std::string DefaultParamImpl(
    util::ParamData& data,
    const typename std::enable_if<util::IsStdVector<T>::value>::type* /* junk */)
{
  // Print each element in an array delimited by square brackets.
  std::ostringstream oss;
  const T& vector = boost::any_cast<T>(data.value);
  oss << "[";
  if (std::is_same<T, std::vector<std::string>>::value)
  {
    if (vector.size() > 0)
    {
      for (size_t i = 0; i < vector.size() - 1; ++i)
      {
        oss << "'" << vector[i] << "', ";
      }

      oss << "'" << vector[vector.size() - 1] << "'";
    }

    oss << "]";
  }
  else
  {
    if (vector.size() > 0)
    {
      for (size_t i = 0; i < vector.size() - 1; ++i)
      {
        oss << vector[i] << ", ";
      }

      oss << vector[vector.size() - 1];
    }

    oss << "]";
  }
  return oss.str();
}

template<typename T>
std::string DefaultParamImpl(
    util::ParamData& data,
    const typename std::enable_if<std::is_same<T, std::string>::value>::type*)
{
  const std::string& s = *boost::any_cast<std::string>(&data.value);
  return "'" + s + "'";
}

template<typename T>
std::string DefaultParamImpl(
    util::ParamData& /* data */,
    const typename std::enable_if<
        arma::is_arma_type<T>::value ||
        std::is_same<T, std::tuple<mlpack::data::DatasetInfo,
                                   arma::mat>>::value>::type* /* junk */)
{
  // Get the filename and return it, or return an empty string.
  if (std::is_same<T, arma::rowvec>::value ||
      std::is_same<T, arma::vec>::value)
  {
    return "np.empty([0])";
  }
  else if (std::is_same<T, arma::Col<size_t>>::value ||
           std::is_same<T, arma::Row<size_t>>::value)
  {
    return "np.empty([0], dtype=np.uint64)";
  }
  else if (std::is_same<T, arma::Mat<size_t>>::value)
  {
    return "np.empty([0, 0], dtype=np.uint64)";
  }
  else
  {
    return "np.empty([0, 0])";
  }
}

template<typename T>
std::string DefaultParamImpl(
    util::ParamData& /* data */,
    const typename std::enable_if<!arma::is_arma_type<T>::value>::type* /* junk */,
    const typename std::enable_if<data::HasSerialize<T>::value>::type* /* junk */)
{
  return "None";
}

} // namespace python
} // namespace bindings
} // namespace mlpack

#endif