lp_interior_point.cpp 57.7 KB
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/**
 * @file math/python/LPInteriorPoint.cc
 * @date Fri Jan 27 21:06:59 2012 +0100
 * @author Laurent El Shafey <Laurent.El-Shafey@idiap.ch>
 *
 * @brief Binds the interior point methods which allow to solve a
 *        Linear Programming problem (LP).
 *
 * Copyright (C) 2011-2013 Idiap Research Institute, Martigny, Switzerland
 */

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#include "lp_interior_point.h"
#include <xbob.blitz/cppapi.h>
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#include <xbob.blitz/cleanup.h>
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#include <bob/math/LPInteriorPoint.h>
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#include <structmember.h>
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/************************************************
 * Implementation of LPInteriorPoint base class *
 ************************************************/

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PyDoc_STRVAR(s_lpinteriorpoint_str, XBOB_EXT_MODULE_PREFIX ".LPInteriorPoint");

PyDoc_STRVAR(s_lpinteriorpoint_doc,
"Base class to solve a linear program using interior point methods.\n\
For more details about the algorithms,please refer to the following\n\
book: *\"Primal-Dual Interior-Point Methods\", Stephen J. Wright,\n\
ISBN: 978-0898713824, Chapter 5, \"Path-Following Algorithms\"*.\n\
\n\
.. warning::\n\
\n\
   You cannot instantiate an object of this type directly, you must\n\
   use it through one of the inherited types.\n\
\n\
The primal linear program (LP) is defined as follows:\n\
\n\
   min transpose(c)*x, s.t. A*x=b, x>=0\n\
\n\
The dual formulation is:\n\
\n\
   min transpose(b)*lambda, s.t. transpose(A)*lambda+mu=c\n\
\n\
");

/* Type definition for PyBobMathLpInteriorPointObject */
typedef struct {
  PyObject_HEAD

  /* Type-specific fields go here. */
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  bob::math::LPInteriorPoint* base;
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} PyBobMathLpInteriorPointObject;


static int PyBobMathLpInteriorPoint_init(PyBobMathLpInteriorPointObject* self, PyObject*, PyObject*) {

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  PyErr_Format(PyExc_NotImplementedError, "cannot initialize object of base type `%s' - use one of the inherited classes", Py_TYPE(self)->tp_name);
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  return -1;

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}

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PyDoc_STRVAR(s_M_str, "m");
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PyDoc_STRVAR(s_M_doc,
"The first dimension of the problem/A matrix"
);

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static PyObject* PyBobMathLpInteriorPoint_getM (PyBobMathLpInteriorPointObject* self,
    void* /*closure*/) {
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  return Py_BuildValue("n", self->base->getDimM());
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}

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static int PyBobMathLpInteriorPoint_setM (PyBobMathLpInteriorPointObject* self,
    PyObject* o, void* /*closure*/) {

  Py_ssize_t M = PyNumber_AsSsize_t(o, PyExc_OverflowError);
  if (PyErr_Occurred()) return -1;

  try {
    self->base->setDimM(M);
  }
  catch (std::exception& e) {
    PyErr_SetString(PyExc_RuntimeError, e.what());
    return -1;
  }
  catch (...) {
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    PyErr_Format(PyExc_RuntimeError, "cannot reset size M of `%s': unknown exception caught", Py_TYPE(self)->tp_name);
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    return -1;
  }

  return 0;

}

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PyDoc_STRVAR(s_N_str, "n");
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PyDoc_STRVAR(s_N_doc,
"The second dimension of the problem/A matrix"
);

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static PyObject* PyBobMathLpInteriorPoint_getN (PyBobMathLpInteriorPointObject* self,
    void* /*closure*/) {
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  return Py_BuildValue("n", self->base->getDimN());
}

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static int PyBobMathLpInteriorPoint_setN (PyBobMathLpInteriorPointObject* self,
    PyObject* o, void* /*closure*/) {

  Py_ssize_t N = PyNumber_AsSsize_t(o, PyExc_OverflowError);
  if (PyErr_Occurred()) return -1;

  try {
    self->base->setDimN(N);
  }
  catch (std::exception& e) {
    PyErr_SetString(PyExc_RuntimeError, e.what());
    return -1;
  }
  catch (...) {
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    PyErr_Format(PyExc_RuntimeError, "cannot reset size N of `%s': unknown exception caught", Py_TYPE(self)->tp_name);
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    return -1;
  }

  return 0;

}

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PyDoc_STRVAR(s_epsilon_str, "epsilon");
PyDoc_STRVAR(s_epsilon_doc,
"The precision to determine whether an equality constraint is fulfilled or not"
);

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static PyObject* PyBobMathLpInteriorPoint_getEpsilon (PyBobMathLpInteriorPointObject* self, void* /*closure*/) {
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  return Py_BuildValue("d", self->base->getEpsilon());
}

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static int PyBobMathLpInteriorPoint_setEpsilon (PyBobMathLpInteriorPointObject* self,
    PyObject* o, void* /*closure*/) {

  double e = PyFloat_AsDouble(o);
  if (PyErr_Occurred()) return -1;

  try {
    self->base->setEpsilon(e);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
    return -1;
  }
  catch (...) {
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    PyErr_Format(PyExc_RuntimeError, "cannot reset `epsilon' of `%s': unknown exception caught", Py_TYPE(self)->tp_name);
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    return -1;
  }

  return 0;

}

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PyDoc_STRVAR(s_lambda_str, "lambda_");
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PyDoc_STRVAR(s_lambda_doc,
"The value of the lambda dual variable (read-only)"
);

static PyObject* PyBobMathLpInteriorPoint_lambda (PyBobMathLpInteriorPointObject* self) {
  Py_ssize_t length = self->base->getDimM();
  PyObject* retval = PyBlitzArray_SimpleNew(NPY_FLOAT64, 1, &length);
  if (!retval) return 0;

  blitz::Array<double,1>* wrapper = PyBlitzArrayCxx_AsBlitz<double,1>
    (reinterpret_cast<PyBlitzArrayObject*>(retval));
  (*wrapper) = self->base->getLambda();

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  return PyBlitzArray_NUMPY_WRAP(retval);
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}

PyDoc_STRVAR(s_mu_str, "mu");
PyDoc_STRVAR(s_mu_doc,
"The value of the mu dual variable (read-only)"
);

static PyObject* PyBobMathLpInteriorPoint_mu (PyBobMathLpInteriorPointObject* self) {
  Py_ssize_t length = self->base->getDimN();
  PyObject* retval = PyBlitzArray_SimpleNew(NPY_FLOAT64, 1, &length);
  if (!retval) return 0;

  blitz::Array<double,1>* wrapper = PyBlitzArrayCxx_AsBlitz<double,1>
    (reinterpret_cast<PyBlitzArrayObject*>(retval));
  (*wrapper) = self->base->getMu();

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  return PyBlitzArray_NUMPY_WRAP(retval);
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}

static PyGetSetDef PyBobMathLpInteriorPoint_getseters[] = {
    {
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      s_M_str,
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      (getter)PyBobMathLpInteriorPoint_getM,
      (setter)PyBobMathLpInteriorPoint_setM,
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      s_M_doc,
      0
    },
    {
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      s_N_str,
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      (getter)PyBobMathLpInteriorPoint_getN,
      (setter)PyBobMathLpInteriorPoint_setN,
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      s_N_doc,
      0
    },
    {
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      s_epsilon_str,
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      (getter)PyBobMathLpInteriorPoint_getEpsilon,
      (setter)PyBobMathLpInteriorPoint_setEpsilon,
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      s_epsilon_doc,
      0
    },
    {
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      s_lambda_str,
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      (getter)PyBobMathLpInteriorPoint_lambda,
      0,
      s_lambda_doc,
      0
    },
    {
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      s_mu_str,
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      (getter)PyBobMathLpInteriorPoint_mu,
      0,
      s_mu_doc,
      0
    },
    {0}  /* Sentinel */
};

PyDoc_STRVAR(s_reset_str, "reset");
PyDoc_STRVAR(s_reset_doc,
"o.reset(M, N) -> None\n\
\n\
Resets the size of the problem (M and N correspond to the dimensions of the\n\
A matrix");

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static PyObject* PyBobMathLpInteriorPoint_reset
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(PyBobMathLpInteriorPointObject* self, PyObject *args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"M", "N", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  Py_ssize_t M = 0;
  Py_ssize_t N = 0;

  if (!PyArg_ParseTupleAndKeywords(args, kwds, "nn", kwlist, &M, &N)) return 0;

  try {
    self->base->reset(M, N);
  }
  catch (std::exception& e) {
    PyErr_SetString(PyExc_RuntimeError, e.what());
    return 0;
  }
  catch (...) {
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    PyErr_Format(PyExc_RuntimeError, "cannot reset `%s': unknown exception caught", Py_TYPE(self)->tp_name);
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    return 0;
  }

  Py_RETURN_NONE;

}

PyDoc_STRVAR(s_solve_str, "solve");
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PyDoc_STRVAR(s_solve_doc,
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"o.solve(A, b, c, x0, [lambda, mu]) -> x\n\
\n\
Solves an LP problem\n\
");

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static PyObject* PyBobMathLpInteriorPoint_solve
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(PyBobMathLpInteriorPointObject* self, PyObject *args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"A", "b", "c", "x0", "lambda", "mu", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  PyBlitzArrayObject* A = 0;
  PyBlitzArrayObject* b = 0;
  PyBlitzArrayObject* c = 0;
  PyBlitzArrayObject* x0 = 0;
  PyBlitzArrayObject* lambda = 0;
  PyBlitzArrayObject* mu = 0;

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  if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&O&O&O&|O&O&", kwlist,
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        &PyBlitzArray_Converter, &A,
        &PyBlitzArray_Converter, &b,
        &PyBlitzArray_Converter, &c,
        &PyBlitzArray_Converter, &x0,
        &PyBlitzArray_Converter, &lambda,
        &PyBlitzArray_Converter, &mu
        )) return 0;

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  //protects acquired resources through this scope
  auto A_ = make_safe(A);
  auto b_ = make_safe(b);
  auto c_ = make_safe(c);
  auto x0_ = make_safe(x0);
  auto lambda_ = make_xsafe(lambda);
  auto mu_ = make_xsafe(mu);

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  if (A->type_num != NPY_FLOAT64 || A->ndim != 2) {
    PyErr_SetString(PyExc_TypeError, "Linear program solver only supports 64-bit floats 2D arrays for input vector `A'");
    return 0;
  }

  if (b->type_num != NPY_FLOAT64 || b->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program solver only supports 64-bit floats 1D arrays for input vector `b'");
    return 0;
  }

  if (c->type_num != NPY_FLOAT64 || c->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program solver only supports 64-bit floats 1D arrays for input vector `c'");
    return 0;
  }

  if (x0->type_num != NPY_FLOAT64 || x0->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program solver only supports 64-bit floats 1D arrays for input vector `x0'");
    return 0;
  }

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  if (lambda && (lambda->type_num != NPY_FLOAT64 || lambda->ndim != 1)) {
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    PyErr_SetString(PyExc_TypeError, "Linear program solver only supports 64-bit floats 1D arrays for input vector `lambda'");
    return 0;
  }

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  if (mu && (mu->type_num != NPY_FLOAT64 || mu->ndim != 1)) {
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    PyErr_SetString(PyExc_TypeError, "Linear program solver only supports 64-bit floats 1D arrays for input vector `mu'");
    return 0;
  }

  if ( (lambda && !mu) || (mu && !lambda) ) {
    PyErr_SetString(PyExc_RuntimeError, "Linear program solver requires none or both `mu' and `lambda' - you cannot just specify one of them");
    return 0;
  }

  /* This is where the output is going to be stored */
  PyObject* retval = PyBlitzArray_SimpleNew(NPY_FLOAT64, x0->ndim, x0->shape);
  if (!retval) {
    return 0;
  }
  blitz::Array<double,1>* wrapper = PyBlitzArrayCxx_AsBlitz<double,1>(reinterpret_cast<PyBlitzArrayObject*>(retval));
  (*wrapper) = *PyBlitzArrayCxx_AsBlitz<double,1>(x0);

  try {
    if (lambda && mu) {
      self->base->solve(
          *PyBlitzArrayCxx_AsBlitz<double,2>(A),
          *PyBlitzArrayCxx_AsBlitz<double,1>(b),
          *PyBlitzArrayCxx_AsBlitz<double,1>(c),
          *wrapper,
          *PyBlitzArrayCxx_AsBlitz<double,1>(lambda),
          *PyBlitzArrayCxx_AsBlitz<double,1>(mu)
          );
    }
    else {
      self->base->solve(
          *PyBlitzArrayCxx_AsBlitz<double,2>(A),
          *PyBlitzArrayCxx_AsBlitz<double,1>(b),
          *PyBlitzArrayCxx_AsBlitz<double,1>(c),
          *wrapper
          );
    }
  }
  catch (std::exception& e) {
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    Py_DECREF(retval);
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    PyErr_SetString(PyExc_RuntimeError, e.what());
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    return 0;
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  }
  catch (...) {
    Py_DECREF(retval);
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    PyErr_Format(PyExc_RuntimeError, "cannot solve `%s': unknown exception caught", Py_TYPE(self)->tp_name);
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    return 0;
  }

  /* We only "return" the first half of the `x' vector */
  (reinterpret_cast<PyBlitzArrayObject*>(retval))->shape[0] /= 2;
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  return PyBlitzArray_NUMPY_WRAP(retval);
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}

PyDoc_STRVAR(s_is_feasible_str, "is_feasible");
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PyDoc_STRVAR(s_is_feasible_doc,
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"o.is_feasible(A, b, c, x, lambda, mu) -> bool\n\
\n\
Checks if a primal-dual point (x,lambda,mu) belongs to the set of\n\
feasible point (i.e. fulfill the constraints)\n\
\n\
");

static PyObject* PyBobMathLpInteriorPoint_is_feasible
(PyBobMathLpInteriorPointObject* self, PyObject *args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"A", "b", "c", "x", "lambda", "mu", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  PyBlitzArrayObject* A = 0;
  PyBlitzArrayObject* b = 0;
  PyBlitzArrayObject* c = 0;
  PyBlitzArrayObject* x = 0;
  PyBlitzArrayObject* lambda = 0;
  PyBlitzArrayObject* mu = 0;

  if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&O&O&O&O&O&", kwlist,
        &PyBlitzArray_Converter, &A,
        &PyBlitzArray_Converter, &b,
        &PyBlitzArray_Converter, &c,
        &PyBlitzArray_Converter, &x,
        &PyBlitzArray_Converter, &lambda,
        &PyBlitzArray_Converter, &mu
        )) return 0;

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  //protects acquired resources through this scope
  auto A_ = make_safe(A);
  auto b_ = make_safe(b);
  auto c_ = make_safe(c);
  auto x_ = make_safe(x);
  auto lambda_ = make_safe(lambda);
  auto mu_ = make_safe(mu);

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  if (A->type_num != NPY_FLOAT64 || A->ndim != 2) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_feasible only supports 64-bit floats 2D arrays for input vector `A'");
    return 0;
  }

  if (b->type_num != NPY_FLOAT64 || b->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_feasible only supports 64-bit floats 1D arrays for input vector `b'");
    return 0;
  }

  if (c->type_num != NPY_FLOAT64 || c->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_feasible only supports 64-bit floats 1D arrays for input vector `c'");
    return 0;
  }

  if (x->type_num != NPY_FLOAT64 || x->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_feasible only supports 64-bit floats 1D arrays for input vector `x0'");
    return 0;
  }

  if (lambda->type_num != NPY_FLOAT64 || lambda->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_feasible only supports 64-bit floats 1D arrays for input vector `lambda'");
    return 0;
  }

  if (mu->type_num != NPY_FLOAT64 || mu->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_feasible only supports 64-bit floats 1D arrays for input vector `mu'");
    return 0;
  }

  bool feasible = false;

  try {
    feasible = self->base->isFeasible(
        *PyBlitzArrayCxx_AsBlitz<double,2>(A),
        *PyBlitzArrayCxx_AsBlitz<double,1>(b),
        *PyBlitzArrayCxx_AsBlitz<double,1>(c),
        *PyBlitzArrayCxx_AsBlitz<double,1>(x),
        *PyBlitzArrayCxx_AsBlitz<double,1>(lambda),
        *PyBlitzArrayCxx_AsBlitz<double,1>(mu)
        );
  }
  catch (std::exception& e) {
    PyErr_SetString(PyExc_RuntimeError, e.what());
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    return 0;
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  }
  catch (...) {
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    PyErr_Format(PyExc_RuntimeError, "cannot check feasibility of `%s': unknown exception caught", Py_TYPE(self)->tp_name);
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    return 0;
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  }

  if (feasible) Py_RETURN_TRUE;
  Py_RETURN_FALSE;

}

PyDoc_STRVAR(s_is_in_v_str, "is_in_v");
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PyDoc_STRVAR(s_is_in_v_doc,
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"o.is_in_v(x, mu, theta) -> bool\n\
\n\
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Checks if a primal-dual point (x,lambda,mu) belongs to the V2\n\
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neighborhood of the central path.\n\
\n\
");

static PyObject* PyBobMathLpInteriorPoint_is_in_v
(PyBobMathLpInteriorPointObject* self, PyObject *args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"x", "mu", "theta", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  PyBlitzArrayObject* x = 0;
  PyBlitzArrayObject* mu = 0;
  double theta = 0.;

  if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&O&d", kwlist,
        &PyBlitzArray_Converter, &x,
        &PyBlitzArray_Converter, &mu,
        &theta
        )) return 0;

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  //protects acquired resources through this scope
  auto x_ = make_safe(x);
  auto mu_ = make_safe(mu);

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  if (x->type_num != NPY_FLOAT64 || x->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_in_v only supports 64-bit floats 1D arrays for input vector `x0'");
    return 0;
  }

  if (mu->type_num != NPY_FLOAT64 || mu->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_in_v only supports 64-bit floats 1D arrays for input vector `mu'");
    return 0;
  }

  bool in_v = false;

  try {
    in_v = self->base->isInV(
        *PyBlitzArrayCxx_AsBlitz<double,1>(x),
        *PyBlitzArrayCxx_AsBlitz<double,1>(mu),
        theta
        );
  }
  catch (std::exception& e) {
    PyErr_SetString(PyExc_RuntimeError, e.what());
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    return 0;
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  }
  catch (...) {
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    PyErr_Format(PyExc_RuntimeError, "cannot check if point is in V at `%s': unknown exception caught", Py_TYPE(self)->tp_name);
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    return 0;
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  }

  if (in_v) Py_RETURN_TRUE;
  Py_RETURN_FALSE;

}

PyDoc_STRVAR(s_is_in_v_s_str, "is_in_v_s");
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PyDoc_STRVAR(s_is_in_v_s_doc,
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"o.is_in_v_s(A, b, c, x, lambda, mu) -> bool\n\
\n\
Checks if a primal-dual point (x,lambda,mu) belongs to the V\n\
neighborhood of the central path and the set of feasible points.\n\
\n\
");

static PyObject* PyBobMathLpInteriorPoint_is_in_v_s
(PyBobMathLpInteriorPointObject* self, PyObject *args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"A", "b", "c", "x", "lambda", "mu", "theta", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  PyBlitzArrayObject* A = 0;
  PyBlitzArrayObject* b = 0;
  PyBlitzArrayObject* c = 0;
  PyBlitzArrayObject* x = 0;
  PyBlitzArrayObject* lambda = 0;
  PyBlitzArrayObject* mu = 0;
  double theta = 0.;

  if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&O&O&O&O&O&d", kwlist,
        &PyBlitzArray_Converter, &A,
        &PyBlitzArray_Converter, &b,
        &PyBlitzArray_Converter, &c,
        &PyBlitzArray_Converter, &x,
        &PyBlitzArray_Converter, &lambda,
        &PyBlitzArray_Converter, &mu,
        &theta
        )) return 0;

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  //protects acquired resources through this scope
  auto A_ = make_safe(A);
  auto b_ = make_safe(b);
  auto c_ = make_safe(c);
  auto x_ = make_safe(x);
  auto lambda_ = make_safe(lambda);
  auto mu_ = make_safe(mu);

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  if (A->type_num != NPY_FLOAT64 || A->ndim != 2) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_in_v_s only supports 64-bit floats 2D arrays for input vector `A'");
    return 0;
  }

  if (b->type_num != NPY_FLOAT64 || b->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_in_v_s only supports 64-bit floats 1D arrays for input vector `b'");
    return 0;
  }

  if (c->type_num != NPY_FLOAT64 || c->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_in_v_s only supports 64-bit floats 1D arrays for input vector `c'");
    return 0;
  }

  if (x->type_num != NPY_FLOAT64 || x->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_in_v_s only supports 64-bit floats 1D arrays for input vector `x0'");
    return 0;
  }

  if (lambda->type_num != NPY_FLOAT64 || lambda->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_in_v_s only supports 64-bit floats 1D arrays for input vector `lambda'");
    return 0;
  }

  if (mu->type_num != NPY_FLOAT64 || mu->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_in_v_s only supports 64-bit floats 1D arrays for input vector `mu'");
    return 0;
  }

  bool in_v_s = false;

  try {
    in_v_s = self->base->isInVS(
        *PyBlitzArrayCxx_AsBlitz<double,2>(A),
        *PyBlitzArrayCxx_AsBlitz<double,1>(b),
        *PyBlitzArrayCxx_AsBlitz<double,1>(c),
        *PyBlitzArrayCxx_AsBlitz<double,1>(x),
        *PyBlitzArrayCxx_AsBlitz<double,1>(lambda),
        *PyBlitzArrayCxx_AsBlitz<double,1>(mu),
        theta
        );
  }
  catch (std::exception& e) {
    PyErr_SetString(PyExc_RuntimeError, e.what());
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    return 0;
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  }
  catch (...) {
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    PyErr_Format(PyExc_RuntimeError, "cannot check if point is in VS at `%s': unknown exception caught", Py_TYPE(self)->tp_name);
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    return 0;
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  }

  if (in_v_s) Py_RETURN_TRUE;
  Py_RETURN_FALSE;

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}

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PyDoc_STRVAR(s_initialize_dual_lambda_mu_str, "initialize_dual_lambda_mu");
PyDoc_STRVAR(s_initialize_dual_lambda_mu_doc,
"o.initialize_dual_lambda_mu(A, c) -> None\n\
\n\
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Initializes the dual variables ``lambda`` and ``mu`` by minimizing the\n\
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logarithmic barrier function.\n\
\n\
");

static PyObject* PyBobMathLpInteriorPoint_initialize_dual_lambda_mu
(PyBobMathLpInteriorPointObject* self, PyObject *args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"A", "c", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  PyBlitzArrayObject* A = 0;
  PyBlitzArrayObject* c = 0;

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  if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&O&", kwlist,
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        &PyBlitzArray_Converter, &A,
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        &PyBlitzArray_Converter, &c
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        )) return 0;

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  //protects acquired resources through this scope
  auto A_ = make_safe(A);
  auto c_ = make_safe(c);

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  if (A->type_num != NPY_FLOAT64 || A->ndim != 2) {
    PyErr_SetString(PyExc_TypeError, "Linear program initialize_dual_lambda_mu only supports 64-bit floats 2D arrays for input vector `A'");
    return 0;
  }

  if (c->type_num != NPY_FLOAT64 || c->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program initialize_dual_lambda_mu only supports 64-bit floats 1D arrays for input vector `c'");
    return 0;
  }

  try {
    self->base->initializeDualLambdaMu(
        *PyBlitzArrayCxx_AsBlitz<double,2>(A),
        *PyBlitzArrayCxx_AsBlitz<double,1>(c)
        );
  }
  catch (std::exception& e) {
    PyErr_SetString(PyExc_RuntimeError, e.what());
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    return 0;
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  }
  catch (...) {
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    PyErr_Format(PyExc_RuntimeError, "cannot initialize dual lambda-mu at `%s': unknown exception caught", Py_TYPE(self)->tp_name);
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    return 0;
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  }

  Py_RETURN_NONE;

}

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static PyMethodDef PyBobMathLpInteriorPoint_methods[] = {
    {
      s_reset_str,
      (PyCFunction)PyBobMathLpInteriorPoint_reset,
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      METH_VARARGS|METH_KEYWORDS,
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      s_reset_doc
    },
    {
      s_solve_str,
      (PyCFunction)PyBobMathLpInteriorPoint_solve,
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      METH_VARARGS|METH_KEYWORDS,
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      s_solve_doc
    },
    {
      s_is_feasible_str,
      (PyCFunction)PyBobMathLpInteriorPoint_is_feasible,
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      METH_VARARGS|METH_KEYWORDS,
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      s_is_feasible_doc
    },
    {
      s_is_in_v_str,
      (PyCFunction)PyBobMathLpInteriorPoint_is_in_v,
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      METH_VARARGS|METH_KEYWORDS,
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      s_is_in_v_doc
    },
    {
      s_is_in_v_s_str,
      (PyCFunction)PyBobMathLpInteriorPoint_is_in_v_s,
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      METH_VARARGS|METH_KEYWORDS,
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      s_is_in_v_s_doc
    },
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    {
      s_initialize_dual_lambda_mu_str,
      (PyCFunction)PyBobMathLpInteriorPoint_initialize_dual_lambda_mu,
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      METH_VARARGS|METH_KEYWORDS,
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      s_initialize_dual_lambda_mu_doc
    },
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    {0}  /* Sentinel */
};

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static int PyBobMathLpInteriorPoint_Check(PyObject* o) {
  return PyObject_IsInstance(o, reinterpret_cast<PyObject*>(&PyBobMathLpInteriorPoint_Type));
}

static PyObject* PyBobMathLpInteriorPoint_RichCompare (PyBobMathLpInteriorPointObject* self, PyObject* other, int op) {

  if (!PyBobMathLpInteriorPoint_Check(other)) {
    PyErr_Format(PyExc_TypeError, "cannot compare `%s' with `%s'",
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        Py_TYPE(self)->tp_name, other->ob_type->tp_name);
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    return 0;
  }
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  PyBobMathLpInteriorPointObject* other_ = reinterpret_cast<PyBobMathLpInteriorPointObject*>(other);
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  switch (op) {
    case Py_EQ:
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      if (*(self->base) == *(other_->base)) Py_RETURN_TRUE;
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      Py_RETURN_FALSE;
      break;
    case Py_NE:
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      if (*(self->base) != *(other_->base)) Py_RETURN_TRUE;
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      Py_RETURN_FALSE;
      break;
    default:
      Py_INCREF(Py_NotImplemented);
      return Py_NotImplemented;
  }

}

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PyTypeObject PyBobMathLpInteriorPoint_Type = {
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    PyVarObject_HEAD_INIT(0, 0)
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    s_lpinteriorpoint_str,                             /*tp_name*/
    sizeof(PyBobMathLpInteriorPointObject),            /*tp_basicsize*/
    0,                                                 /*tp_itemsize*/
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    0,                                                 /*tp_dealloc*/
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    0,                                                 /*tp_print*/
    0,                                                 /*tp_getattr*/
    0,                                                 /*tp_setattr*/
    0,                                                 /*tp_compare*/
    0,                                                 /*tp_repr*/
    0,                                                 /*tp_as_number*/
    0,                                                 /*tp_as_sequence*/
    0,                                                 /*tp_as_mapping*/
    0,                                                 /*tp_hash */
    0,                                                 /*tp_call*/
    0,                                                 /*tp_str*/
    0,                                                 /*tp_getattro*/
    0,                                                 /*tp_setattro*/
    0,                                                 /*tp_as_buffer*/
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,          /*tp_flags*/
    s_lpinteriorpoint_doc,                             /* tp_doc */
    0,		                                             /* tp_traverse */
    0,		                                             /* tp_clear */
    (richcmpfunc)PyBobMathLpInteriorPoint_RichCompare, /* tp_richcompare */
    0,		                                             /* tp_weaklistoffset */
    0,		                                             /* tp_iter */
    0,		                                             /* tp_iternext */
    PyBobMathLpInteriorPoint_methods,                  /* tp_methods */
    0,                                                 /* tp_members */
    PyBobMathLpInteriorPoint_getseters,                /* tp_getset */
    0,                                                 /* tp_base */
    0,                                                 /* tp_dict */
    0,                                                 /* tp_descr_get */
    0,                                                 /* tp_descr_set */
    0,                                                 /* tp_dictoffset */
    (initproc)PyBobMathLpInteriorPoint_init,           /* tp_init */
    0,                                                 /* tp_alloc */
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    0,                                                 /* tp_new */
};

/****************************************************
 * Implementation of LPInteriorPointShortstep class *
 ****************************************************/

PyDoc_STRVAR(s_lpinteriorpointshortstep_str, XBOB_EXT_MODULE_PREFIX ".LPInteriorPointShortstep");

PyDoc_STRVAR(s_lpinteriorpointshortstep_doc,
"LPInteriorPointShortstep(M, N, theta, epsilon) -> new LPInteriorPointShortstep\n\
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LPInteriorPointShortstep(solver) -> new LPInteriorPointShortstep\n\
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\n\
A Linear Program solver based on a short step interior point method.\n\
\n\
See :py:class:`LPInteriorPoint` for more details on the base class.\n\
\n\
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Objects of this class can be initialized in two different ways: a\n\
detailed constructor with the parameters described below or a copy\n\
constructor, that deep-copies the input object and creates a new\n\
object (**not** a new reference to the same object).\n\
\n\
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Constructor parameters:\n\
\n\
M\n\
  (int) first dimension of the A matrix\n\
\n\
N\n\
  (int) second dimension of the A matrix\n\
\n\
theta\n\
  (float) theta The value defining the size of the V2 neighborhood\n\
\n\
epsilon\n\
  (float) The precision to determine whether an equality constraint\n\
  is fulfilled or not.\n\
\n\
");

/* Type definition for PyBobMathLpInteriorPointObject */
typedef struct {
  PyBobMathLpInteriorPointObject parent;

  /* Type-specific fields go here. */
  bob::math::LPInteriorPointShortstep* base;

} PyBobMathLpInteriorPointShortstepObject;

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static int PyBobMathLpInteriorPointShortstep_Check(PyObject* o) {
  return PyObject_IsInstance(o, reinterpret_cast<PyObject*>(&PyBobMathLpInteriorPointShortstep_Type));
}

static int PyBobMathLpInteriorPointShortstep_init1(PyBobMathLpInteriorPointShortstepObject* self, PyObject* args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"solver", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  PyObject* solver = 0;

  if (!PyArg_ParseTupleAndKeywords(args, kwds, "O", kwlist, &solver)) return -1;

  if (!PyBobMathLpInteriorPointShortstep_Check(solver)) {
    PyErr_Format(PyExc_TypeError, "copy-constructor for %s requires an object of the same type, not %s", s_lpinteriorpointshortstep_str, solver->ob_type->tp_name);
    return -1;
  }

  PyBobMathLpInteriorPointShortstepObject* other = reinterpret_cast<PyBobMathLpInteriorPointShortstepObject*>(solver);

  try {
    self->base = new bob::math::LPInteriorPointShortstep(*other->base);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
  }
  catch (...) {
    PyErr_Format(PyExc_RuntimeError, "cannot deep-copy object of type %s: unknown exception caught", s_lpinteriorpointshortstep_str);
  }
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  self->parent.base = self->base;

  if (PyErr_Occurred()) return -1;

  return 0;

}

static int PyBobMathLpInteriorPointShortstep_init4(PyBobMathLpInteriorPointShortstepObject* self, PyObject* args, PyObject* kwds) {
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  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"M", "N", "theta", "epsilon", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  Py_ssize_t M = 0;
  Py_ssize_t N = 0;
  double theta = 0.;
  double epsilon = 0.;

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  if (!PyArg_ParseTupleAndKeywords(args, kwds, "nndd", kwlist,
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        &M, &N, &theta, &epsilon)) return -1;

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  try {
    self->base = new bob::math::LPInteriorPointShortstep(M, N, theta, epsilon);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
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    return -1;
  }
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  catch (...) {
    PyErr_Format(PyExc_RuntimeError, "cannot construct object of type %s: unknown exception caught", s_lpinteriorpointshortstep_str);
    return -1;
  }
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  self->parent.base = self->base;

  return 0;

}

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static int PyBobMathLpInteriorPointShortstep_init(PyBobMathLpInteriorPointShortstepObject* self, PyObject* args, PyObject* kwds) {

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  Py_ssize_t nargs = (args?PyTuple_Size(args):0) + (kwds?PyDict_Size(kwds):0);
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  switch (nargs) {

    case 1:
      return PyBobMathLpInteriorPointShortstep_init1(self, args, kwds);
      break;

    case 4:
      return PyBobMathLpInteriorPointShortstep_init4(self, args, kwds);
      break;

    default:

      PyErr_Format(PyExc_RuntimeError, "number of arguments mismatch - %s requires 1 or 4 arguments, but you provided %" PY_FORMAT_SIZE_T "d (see help)", s_lpinteriorpointshortstep_str, nargs);

  }

  return -1;

}

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static void PyBobMathLpInteriorPointShortstep_delete (PyBobMathLpInteriorPointShortstepObject* self) {
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  delete self->base;
  self->parent.base = 0;
  self->base = 0;
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  Py_TYPE(&self->parent)->tp_free((PyObject*)self);
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}

PyDoc_STRVAR(s_theta_str, "theta");
PyDoc_STRVAR(s_theta_doc,
"The value theta used to define a V2 neighborhood"
);

static PyObject* PyBobMathLpInteriorPointShortstep_getTheta (PyBobMathLpInteriorPointShortstepObject* self, void* /*closure*/) {
  return Py_BuildValue("d", self->base->getTheta());
}

static int PyBobMathLpInteriorPointShortstep_setTheta (PyBobMathLpInteriorPointShortstepObject* self,
    PyObject* o, void* /*closure*/) {

  double e = PyFloat_AsDouble(o);
  if (PyErr_Occurred()) return -1;

  try {
    self->base->setTheta(e);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
    return -1;
  }
  catch (...) {
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    PyErr_Format(PyExc_RuntimeError, "cannot reset `theta' of %s: unknown exception caught", s_lpinteriorpointshortstep_str);
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    return -1;
  }

  return 0;

}

static PyGetSetDef PyBobMathLpInteriorPointShortstep_getseters[] = {
    {
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      s_theta_str,
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      (getter)PyBobMathLpInteriorPointShortstep_getTheta,
      (setter)PyBobMathLpInteriorPointShortstep_setTheta,
      s_theta_doc,
      0
    },
    {0}  /* Sentinel */
};

static PyObject* PyBobMathLpInteriorPointShortstep_RichCompare
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(PyBobMathLpInteriorPointShortstepObject* self, PyObject* other, int op) {

  if (!PyBobMathLpInteriorPointShortstep_Check(other)) {
    PyErr_Format(PyExc_TypeError, "cannot compare `%s' with `%s'",
        s_lpinteriorpointshortstep_str, other->ob_type->tp_name);
    return 0;
  }
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  PyBobMathLpInteriorPointShortstepObject* other_ = reinterpret_cast<PyBobMathLpInteriorPointShortstepObject*>(other);
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  switch (op) {
    case Py_EQ:
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      if (*(self->base) == *(other_->base)) Py_RETURN_TRUE;
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      Py_RETURN_FALSE;
      break;
    case Py_NE:
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      if (*(self->base) != *(other_->base)) Py_RETURN_TRUE;
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      Py_RETURN_FALSE;
      break;
    default:
      Py_INCREF(Py_NotImplemented);
      return Py_NotImplemented;
  }

}

PyTypeObject PyBobMathLpInteriorPointShortstep_Type = {
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    PyVarObject_HEAD_INIT(0, 0)
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    s_lpinteriorpointshortstep_str,                             /*tp_name*/
    sizeof(PyBobMathLpInteriorPointShortstepObject),            /*tp_basicsize*/
    0,                                                          /*tp_itemsize*/
    (destructor)PyBobMathLpInteriorPointShortstep_delete,       /*tp_dealloc*/
    0,                                                          /*tp_print*/
    0,                                                          /*tp_getattr*/
    0,                                                          /*tp_setattr*/
    0,                                                          /*tp_compare*/
    0,                                                          /*tp_repr*/
    0,                                                          /*tp_as_number*/
    0,                                                          /*tp_as_sequence*/
    0,                                                          /*tp_as_mapping*/
    0,                                                          /*tp_hash */
    0,                                                          /*tp_call*/
    0,                                                          /*tp_str*/
    0,                                                          /*tp_getattro*/
    0,                                                          /*tp_setattro*/
    0,                                                          /*tp_as_buffer*/
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,                   /*tp_flags*/
    s_lpinteriorpointshortstep_doc,                             /* tp_doc */
    0,		                                                      /* tp_traverse */
    0,		                                                      /* tp_clear */
    (richcmpfunc)PyBobMathLpInteriorPointShortstep_RichCompare, /* tp_richcompare */
    0,		                                                      /* tp_weaklistoffset */
    0,		                                                      /* tp_iter */
    0,		                                                      /* tp_iternext */
    0,                                                          /* tp_methods */
    0,                                                          /* tp_members */
    PyBobMathLpInteriorPointShortstep_getseters,                /* tp_getset */
    0,                                                          /* tp_base */
    0,                                                          /* tp_dict */
    0,                                                          /* tp_descr_get */
    0,                                                          /* tp_descr_set */
    0,                                                          /* tp_dictoffset */
    (initproc)PyBobMathLpInteriorPointShortstep_init,           /* tp_init */
    0,                                                          /* tp_alloc */
    0,                                                          /* tp_new */
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};

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/*************************************************************
 * Implementation of LPInteriorPointPredictorCorrector class *
 *************************************************************/

PyDoc_STRVAR(s_lpinteriorpointpredictorcorrector_str, XBOB_EXT_MODULE_PREFIX ".LPInteriorPointPredictorCorrector");

PyDoc_STRVAR(s_lpinteriorpointpredictorcorrector_doc,
"LPInteriorPointPredictorCorrector(M, N, theta_pred, theta_corr, epsilon) -> new LPInteriorPointPredictorCorrector\n\
LPInteriorPointPredictorCorrector(solver) -> new LPInteriorPointPredictorCorrector\n\
\n\
A Linear Program solver based on a predictor-corrector interior point\n\
method.\n\
\n\
See :py:class:`LPInteriorPoint` for more details on the base class.\n\
\n\
Objects of this class can be initialized in two different ways: a\n\
detailed constructor with the parameters described below or a copy\n\
constructor, that deep-copies the input object and creates a new\n\
object (**not** a new reference to the same object).\n\
\n\
Constructor parameters:\n\
\n\
M\n\
  (int) first dimension of the A matrix\n\
\n\
N\n\
  (int) second dimension of the A matrix\n\
\n\
theta_pred\n\
  (float) the value theta_pred used to define a V2 neighborhood\n\
\n\
theta_corr\n\
  (float) the value theta_corr used to define a V2 neighborhood\n\
\n\
epsilon\n\
  (float) The precision to determine whether an equality constraint\n\
  is fulfilled or not.\n\
\n\
");

/* Type definition for PyBobMathLpInteriorPointObject */
typedef struct {
  PyBobMathLpInteriorPointObject parent;

  /* Type-specific fields go here. */
  bob::math::LPInteriorPointPredictorCorrector* base;

} PyBobMathLpInteriorPointPredictorCorrectorObject;

static int PyBobMathLpInteriorPointPredictorCorrector_Check(PyObject* o) {
  return PyObject_IsInstance(o, reinterpret_cast<PyObject*>(&PyBobMathLpInteriorPointPredictorCorrector_Type));
}

static int PyBobMathLpInteriorPointPredictorCorrector_init1(PyBobMathLpInteriorPointPredictorCorrectorObject* self, PyObject* args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"solver", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  PyObject* solver = 0;

  if (!PyArg_ParseTupleAndKeywords(args, kwds, "O", kwlist, &solver)) return -1;

  if (!PyBobMathLpInteriorPointPredictorCorrector_Check(solver)) {
    PyErr_Format(PyExc_TypeError, "copy-constructor for %s requires an object of the same type, not %s", s_lpinteriorpointpredictorcorrector_str, solver->ob_type->tp_name);
    return -1;
  }

  PyBobMathLpInteriorPointPredictorCorrectorObject* other = reinterpret_cast<PyBobMathLpInteriorPointPredictorCorrectorObject*>(solver);

  try {
    self->base = new bob::math::LPInteriorPointPredictorCorrector(*other->base);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
  }
  catch (...) {
    PyErr_Format(PyExc_RuntimeError, "cannot deep-copy object of type %s: unknown exception caught", s_lpinteriorpointpredictorcorrector_str);
  }
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  self->parent.base = self->base;

  if (PyErr_Occurred()) return -1;

  return 0;

}

static int PyBobMathLpInteriorPointPredictorCorrector_init5(PyBobMathLpInteriorPointPredictorCorrectorObject* self, PyObject* args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"M", "N", "theta_pred", "theta_corr", "epsilon", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  Py_ssize_t M = 0;
  Py_ssize_t N = 0;
  double theta_pred = 0.;
  double theta_corr = 0.;
  double epsilon = 0.;

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  if (!PyArg_ParseTupleAndKeywords(args, kwds, "nnddd", kwlist,
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        &M, &N, &theta_pred, &theta_corr, &epsilon)) return -1;

  try {
    self->base = new bob::math::LPInteriorPointPredictorCorrector(M, N, theta_pred, theta_corr, epsilon);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
    return -1;
  }
  catch (...) {
    PyErr_Format(PyExc_RuntimeError, "cannot construct object of type %s: unknown exception caught", s_lpinteriorpointpredictorcorrector_str);
    return -1;
  }
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  self->parent.base = self->base;

  return 0;

}

static int PyBobMathLpInteriorPointPredictorCorrector_init(PyBobMathLpInteriorPointPredictorCorrectorObject* self, PyObject* args, PyObject* kwds) {

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  Py_ssize_t nargs = (args?PyTuple_Size(args):0) + (kwds?PyDict_Size(kwds):0);
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  switch (nargs) {

    case 1:
      return PyBobMathLpInteriorPointPredictorCorrector_init1(self, args, kwds);
      break;

    case 5:
      return PyBobMathLpInteriorPointPredictorCorrector_init5(self, args, kwds);
      break;

    default:

      PyErr_Format(PyExc_RuntimeError, "number of arguments mismatch - %s requires 1 or 5 arguments, but you provided %" PY_FORMAT_SIZE_T "d (see help)", s_lpinteriorpointpredictorcorrector_str, nargs);

  }

  return -1;

}

static void PyBobMathLpInteriorPointPredictorCorrector_delete (PyBobMathLpInteriorPointPredictorCorrectorObject* self) {
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  delete self->base;
  self->parent.base = 0;
  self->base = 0;
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  Py_TYPE(&self->parent)->tp_free((PyObject*)self);
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}

PyDoc_STRVAR(s_theta_pred_str, "theta_pred");
PyDoc_STRVAR(s_theta_pred_doc,
"The value theta_pred used to define a V2 neighborhood"
);

static PyObject* PyBobMathLpInteriorPointPredictorCorrector_getThetaPred (PyBobMathLpInteriorPointPredictorCorrectorObject* self, void* /*closure*/) {
  return Py_BuildValue("d", self->base->getThetaPred());
}

static int PyBobMathLpInteriorPointPredictorCorrector_setThetaPred (PyBobMathLpInteriorPointPredictorCorrectorObject* self, PyObject* o, void* /*closure*/) {

  double e = PyFloat_AsDouble(o);
  if (PyErr_Occurred()) return -1;

  try {
    self->base->setThetaPred(e);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
    return -1;
  }
  catch (...) {
    PyErr_Format(PyExc_RuntimeError, "cannot reset `theta_pred' of %s: unknown exception caught", s_lpinteriorpointpredictorcorrector_str);
    return -1;
  }

  return 0;

}

PyDoc_STRVAR(s_theta_corr_str, "theta_corr");
PyDoc_STRVAR(s_theta_corr_doc,
"The value theta_corr used to define a V2 neighborhood"
);

static PyObject* PyBobMathLpInteriorPointPredictorCorrector_getThetaCorr (PyBobMathLpInteriorPointPredictorCorrectorObject* self, void* /*closure*/) {
  return Py_BuildValue("d", self->base->getThetaCorr());
}

static int PyBobMathLpInteriorPointPredictorCorrector_setThetaCorr (PyBobMathLpInteriorPointPredictorCorrectorObject* self, PyObject* o, void* /*closure*/) {

  double e = PyFloat_AsDouble(o);
  if (PyErr_Occurred()) return -1;

  try {
    self->base->setThetaCorr(e);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
    return -1;
  }
  catch (...) {
    PyErr_Format(PyExc_RuntimeError, "cannot reset `theta_corr' of %s: unknown exception caught", s_lpinteriorpointpredictorcorrector_str);
    return -1;
  }

  return 0;

}

static PyGetSetDef PyBobMathLpInteriorPointPredictorCorrector_getseters[] = {
    {
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      s_theta_pred_str,
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      (getter)PyBobMathLpInteriorPointPredictorCorrector_getThetaPred,
      (setter)PyBobMathLpInteriorPointPredictorCorrector_setThetaPred,
      s_theta_pred_doc,
      0
    },
    {
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      s_theta_corr_str,
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      (getter)PyBobMathLpInteriorPointPredictorCorrector_getThetaCorr,
      (setter)PyBobMathLpInteriorPointPredictorCorrector_setThetaCorr,
      s_theta_corr_doc,
      0
    },
    {0}  /* Sentinel */
};

static PyObject* PyBobMathLpInteriorPointPredictorCorrector_RichCompare
(PyBobMathLpInteriorPointPredictorCorrectorObject* self, PyObject* other, int op) {

  if (!PyBobMathLpInteriorPointPredictorCorrector_Check(other)) {
    PyErr_Format(PyExc_TypeError, "cannot compare `%s' with `%s'",
        s_lpinteriorpointpredictorcorrector_str, other->ob_type->tp_name);
    return 0;
  }
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  PyBobMathLpInteriorPointPredictorCorrectorObject* other_ = reinterpret_cast<PyBobMathLpInteriorPointPredictorCorrectorObject*>(other);

  switch (op) {
    case Py_EQ:
      if (*(self->base) == *(other_->base)) Py_RETURN_TRUE;
      Py_RETURN_FALSE;
      break;
    case Py_NE:
      if (*(self->base) != *(other_->base)) Py_RETURN_TRUE;
      Py_RETURN_FALSE;
      break;
    default:
      Py_INCREF(Py_NotImplemented);
      return Py_NotImplemented;
  }

}

PyTypeObject PyBobMathLpInteriorPointPredictorCorrector_Type = {
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    PyVarObject_HEAD_INIT(0, 0)
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    s_lpinteriorpointpredictorcorrector_str,                    /*tp_name*/
    sizeof(PyBobMathLpInteriorPointPredictorCorrectorObject),   /*tp_basicsize*/
    0,                                                          /*tp_itemsize*/
    (destructor)PyBobMathLpInteriorPointPredictorCorrector_delete, /*tp_dealloc*/
    0,                                                          /*tp_print*/
    0,                                                          /*tp_getattr*/
    0,                                                          /*tp_setattr*/
    0,                                                          /*tp_compare*/
    0,                                                          /*tp_repr*/
    0,                                                          /*tp_as_number*/
    0,                                                          /*tp_as_sequence*/
    0,                                                          /*tp_as_mapping*/
    0,                                                          /*tp_hash */
    0,                                                          /*tp_call*/
    0,                                                          /*tp_str*/
    0,                                                          /*tp_getattro*/
    0,                                                          /*tp_setattro*/
    0,                                                          /*tp_as_buffer*/
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,                   /*tp_flags*/
    s_lpinteriorpointpredictorcorrector_doc,                    /* tp_doc */
    0,		                                                      /* tp_traverse */
    0,		                                                      /* tp_clear */
    (richcmpfunc)PyBobMathLpInteriorPointPredictorCorrector_RichCompare, /* tp_richcompare */
    0,		                                                      /* tp_weaklistoffset */
    0,		                                                      /* tp_iter */
    0,		                                                      /* tp_iternext */
    0,                                                          /* tp_methods */
    0,                                                          /* tp_members */
    PyBobMathLpInteriorPointPredictorCorrector_getseters,       /* tp_getset */
    0,                                                          /* tp_base */
    0,                                                          /* tp_dict */
    0,                                                          /* tp_descr_get */
    0,                                                          /* tp_descr_set */
    0,                                                          /* tp_dictoffset */
    (initproc)PyBobMathLpInteriorPointPredictorCorrector_init,  /* tp_init */
    0,                                                          /* tp_alloc */
    0,                                                          /* tp_new */
};

/****************************************************
 * Implementation of LPInteriorPointLongstep class *
 ****************************************************/

PyDoc_STRVAR(s_lpinteriorpointlongstep_str, XBOB_EXT_MODULE_PREFIX ".LPInteriorPointLongstep");

PyDoc_STRVAR(s_lpinteriorpointlongstep_doc,
"LPInteriorPointLongstep(M, N, gamma, sigma, epsilon) -> new LPInteriorPointLongstep\n\
LPInteriorPointLongstep(solver) -> new LPInteriorPointLongstep\n\
\n\
A Linear Program solver based on a long step interior point method.\n\
\n\
See :py:class:`LPInteriorPoint` for more details on the base class.\n\
\n\
Objects of this class can be initialized in two different ways: a\n\
detailed constructor with the parameters described below or a copy\n\
constructor, that deep-copies the input object and creates a new\n\
object (**not** a new reference to the same object).\n\
\n\
Constructor parameters:\n\
\n\
M\n\
  (int) first dimension of the A matrix\n\
\n\
N\n\
  (int) second dimension of the A matrix\n\
\n\
gamma\n\
  (float) The value gamma used to define a V-inf neighborhood\n\
\n\
sigma\n\
  (float) The value sigma used to define a V-inf neighborhood\n\
\n\
epsilon\n\
  (float) The precision to determine whether an equality constraint\n\
  is fulfilled or not.\n\
\n\
");

typedef struct {
  PyBobMathLpInteriorPointObject parent;

  /* Type-specific fields go here. */
  bob::math::LPInteriorPointLongstep* base;

} PyBobMathLpInteriorPointLongstepObject;

static int PyBobMathLpInteriorPointLongstep_Check(PyObject* o) {
  return PyObject_IsInstance(o, reinterpret_cast<PyObject*>(&PyBobMathLpInteriorPointLongstep_Type));
}

static int PyBobMathLpInteriorPointLongstep_init1(PyBobMathLpInteriorPointLongstepObject* self, PyObject* args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"solver", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  PyObject* solver = 0;

  if (!PyArg_ParseTupleAndKeywords(args, kwds, "O", kwlist, &solver)) return -1;

  if (!PyBobMathLpInteriorPointLongstep_Check(solver)) {
    PyErr_Format(PyExc_TypeError, "copy-constructor for %s requires an object of the same type, not %s", s_lpinteriorpointlongstep_str, solver->ob_type->tp_name);
    return -1;
  }

  PyBobMathLpInteriorPointLongstepObject* other = reinterpret_cast<PyBobMathLpInteriorPointLongstepObject*>(solver);

  try {
    self->base = new bob::math::LPInteriorPointLongstep(*other->base);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
  }
  catch (...) {
    PyErr_Format(PyExc_RuntimeError, "cannot deep-copy object of type %s: unknown exception caught", s_lpinteriorpointlongstep_str);
  }
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  self->parent.base = self->base;

  if (PyErr_Occurred()) return -1;

  return 0;

}

static int PyBobMathLpInteriorPointLongstep_init5(PyBobMathLpInteriorPointLongstepObject* self, PyObject* args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"M", "N", "gamma", "sigma", "epsilon", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  Py_ssize_t M = 0;
  Py_ssize_t N = 0;
  double gamma = 0.;
  double sigma = 0.;
  double epsilon = 0.;

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  if (!PyArg_ParseTupleAndKeywords(args, kwds, "nnddd", kwlist,
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        &M, &N, &gamma, &sigma, &epsilon)) return -1;

  try {
    self->base = new bob::math::LPInteriorPointLongstep(M, N, gamma, sigma, epsilon);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
    return -1;
  }
  catch (...) {
    PyErr_Format(PyExc_RuntimeError, "cannot construct object of type %s: unknown exception caught", s_lpinteriorpointlongstep_str);
    return -1;
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  }
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  self->parent.base = self->base;

  return 0;

}

static int PyBobMathLpInteriorPointLongstep_init(PyBobMathLpInteriorPointLongstepObject* self, PyObject* args, PyObject* kwds) {

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  Py_ssize_t nargs = (args?PyTuple_Size(args):0) + (kwds?PyDict_Size(kwds):0);
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  switch (nargs) {

    case 1:
      return PyBobMathLpInteriorPointLongstep_init1(self, args, kwds);
      break;

    case 5:
      return PyBobMathLpInteriorPointLongstep_init5(self, args, kwds);
      break;

    default:

      PyErr_Format(PyExc_RuntimeError, "number of arguments mismatch - %s requires 1 or 5 arguments, but you provided %" PY_FORMAT_SIZE_T "d (see help)", s_lpinteriorpointlongstep_str, nargs);

  }

  return -1;

}

static void PyBobMathLpInteriorPointLongstep_delete (PyBobMathLpInteriorPointLongstepObject* self) {
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  delete self->base;
  self->parent.base = 0;
  self->base = 0;
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  Py_TYPE(&self->parent)->tp_free((PyObject*)self);
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}

PyDoc_STRVAR(s_gamma_str, "gamma");
PyDoc_STRVAR(s_gamma_doc,
"The value gamma used to define a V-Inf neighborhood"
);

static PyObject* PyBobMathLpInteriorPointLongstep_getGamma (PyBobMathLpInteriorPointLongstepObject* self, void* /*closure*/) {
  return Py_BuildValue("d", self->base->getGamma());
}

static int PyBobMathLpInteriorPointLongstep_setGamma (PyBobMathLpInteriorPointLongstepObject* self,
    PyObject* o, void* /*closure*/) {

  double e = PyFloat_AsDouble(o);
  if (PyErr_Occurred()) return -1;

  try {
    self->base->setGamma(e);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
    return -1;
  }
  catch (...) {
    PyErr_Format(PyExc_RuntimeError, "cannot reset `gamma' of %s: unknown exception caught", s_lpinteriorpointlongstep_str);
    return -1;
  }

  return 0;

}

PyDoc_STRVAR(s_sigma_str, "sigma");
PyDoc_STRVAR(s_sigma_doc,
"The value sigma used to define a V-Inf neighborhood"
);

static PyObject* PyBobMathLpInteriorPointLongstep_getSigma (PyBobMathLpInteriorPointLongstepObject* self, void* /*closure*/) {
  return Py_BuildValue("d", self->base->getSigma());
}

static int PyBobMathLpInteriorPointLongstep_setSigma (PyBobMathLpInteriorPointLongstepObject* self,
    PyObject* o, void* /*closure*/) {

  double e = PyFloat_AsDouble(o);
  if (PyErr_Occurred()) return -1;

  try {
    self->base->setSigma(e);
  }
  catch (std::exception& ex) {
    PyErr_SetString(PyExc_RuntimeError, ex.what());
    return -1;
  }
  catch (...) {
    PyErr_Format(PyExc_RuntimeError, "cannot reset `sigma' of %s: unknown exception caught", s_lpinteriorpointlongstep_str);
    return -1;
  }

  return 0;

}

static PyGetSetDef PyBobMathLpInteriorPointLongstep_getseters[] = {
    {
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      s_gamma_str,
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      (getter)PyBobMathLpInteriorPointLongstep_getGamma,
      (setter)PyBobMathLpInteriorPointLongstep_setGamma,
      s_gamma_doc,
      0
    },
    {
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      s_sigma_str,
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      (getter)PyBobMathLpInteriorPointLongstep_getSigma,
      (setter)PyBobMathLpInteriorPointLongstep_setSigma,
      s_sigma_doc,
      0
    },
    {0}  /* Sentinel */
};

static PyObject* PyBobMathLpInteriorPointLongstep_RichCompare
(PyBobMathLpInteriorPointLongstepObject* self, PyObject* other, int op) {

  if (!PyBobMathLpInteriorPointLongstep_Check(other)) {
    PyErr_Format(PyExc_TypeError, "cannot compare `%s' with `%s'",
        s_lpinteriorpointlongstep_str, other->ob_type->tp_name);
    return 0;
  }
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  PyBobMathLpInteriorPointLongstepObject* other_ = reinterpret_cast<PyBobMathLpInteriorPointLongstepObject*>(other);

  switch (op) {
    case Py_EQ:
      if (*(self->base) == *(other_->base)) Py_RETURN_TRUE;
      Py_RETURN_FALSE;
      break;
    case Py_NE:
      if (*(self->base) != *(other_->base)) Py_RETURN_TRUE;
      Py_RETURN_FALSE;
      break;
    default:
      Py_INCREF(Py_NotImplemented);
      return Py_NotImplemented;
  }

}

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PyDoc_STRVAR(s_is_in_vinf_str, "is_in_v");
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PyDoc_STRVAR(s_is_in_vinf_doc,
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"o.is_in_v(x, mu, gamma) -> bool\n\
\n\
Checks if a primal-dual point (x,lambda,mu) belongs to the V-Inf\n\
neighborhood of the central path.\n\
\n\
");

static PyObject* PyBobMathLpInteriorPoint_is_in_vinf
(PyBobMathLpInteriorPointObject* self, PyObject *args, PyObject* kwds) {

  /* Parses input arguments in a single shot */
  static const char* const_kwlist[] = {"x", "mu", "gamma", 0};
  static char** kwlist = const_cast<char**>(const_kwlist);

  PyBlitzArrayObject* x = 0;
  PyBlitzArrayObject* mu = 0;
  double gamma = 0.;

  if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&O&d", kwlist,
        &PyBlitzArray_Converter, &x,
        &PyBlitzArray_Converter, &mu,
        &gamma
        )) return 0;

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  //protects acquired resources through this scope
  auto x_ = make_safe(x);
  auto mu_ = make_safe(mu);

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  if (x->type_num != NPY_FLOAT64 || x->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_in_vinf only supports 64-bit floats 1D arrays for input vector `x0'");
    return 0;
  }

  if (mu->type_num != NPY_FLOAT64 || mu->ndim != 1) {
    PyErr_SetString(PyExc_TypeError, "Linear program is_in_vinf only supports 64-bit floats 1D arrays for input vector `mu'");
    return 0;
  }

  bool in_vinf = false;

  try {
    in_vinf = self->base->isInV(
        *PyBlitzArrayCxx_AsBlitz<double,1>(x),
        *PyBlitzArrayCxx_AsBlitz<double,1>(mu),
        gamma
        );
  }
  catch (std::exception& e) {
    PyErr_SetString(PyExc_RuntimeError, e.what());
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    return 0;
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  }
  catch (...) {
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    PyErr_Format(PyExc_RuntimeError, "cannot check if point is in V-Inf at `%s': unknown exception caught", Py_TYPE(self)->tp_name);
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    return 0;
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  }

  if (in_vinf) Py_RETURN_TRUE;
  Py_RETURN_FALSE;

}

static PyMethodDef PyBobMathLpInteriorPointLongstep_methods[] = {
    {
      s_is_in_vinf_str,
      (PyCFunction)PyBobMathLpInteriorPoint_is_in_vinf,
      METH_VARARGS|METH_KEYWORDS,
      s_is_in_vinf_doc
    },
    {0}  /* Sentinel */
};

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PyTypeObject PyBobMathLpInteriorPointLongstep_Type = {
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    PyVarObject_HEAD_INIT(0, 0)
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    s_lpinteriorpointlongstep_str,                              /*tp_name*/
    sizeof(PyBobMathLpInteriorPointLongstepObject),             /*tp_basicsize*/
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    0,                                                          /*tp_itemsize*/
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    (destructor)PyBobMathLpInteriorPointLongstep_delete,        /*tp_dealloc*/
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    0,                                                          /*tp_print*/
    0,                                                          /*tp_getattr*/
    0,                                                          /*tp_setattr*/
    0,                                                          /*tp_compare*/
    0,                                                          /*tp_repr*/
    0,                                                          /*tp_as_number*/
    0,                                                          /*tp_as_sequence*/
    0,                                                          /*tp_as_mapping*/
    0,                                                          /*tp_hash */
    0,                                                          /*tp_call*/
    0,                                                          /*tp_str*/
    0,                                                          /*tp_getattro*/
    0,                                                          /*tp_setattro*/
    0,                                                          /*tp_as_buffer*/
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,                   /*tp_flags*/
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    s_lpinteriorpointlongstep_doc,                              /* tp_doc */
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    0,		                                                      /* tp_traverse */
    0,		                                                      /* tp_clear */
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    (richcmpfunc)PyBobMathLpInteriorPointLongstep_RichCompare,  /* tp_richcompare */
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    0,		                                                      /* tp_weaklistoffset */
    0,		                                                      /* tp_iter */
    0,		                                                      /* tp_iternext */
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    PyBobMathLpInteriorPointLongstep_methods,                   /* tp_methods */
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    0,                                                          /* tp_members */
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    PyBobMathLpInteriorPointLongstep_getseters,                 /* tp_getset */
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    0,                                                          /* tp_base */
    0,                                                          /* tp_dict */
    0,                                                          /* tp_descr_get */
    0,                                                          /* tp_descr_set */
    0,                                                          /* tp_dictoffset */
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    (initproc)PyBobMathLpInteriorPointLongstep_init,            /* tp_init */
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    0,                                                          /* tp_alloc */
    0,                                                          /* tp_new */
};