/**
* Copyright (C) 2011 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.financial.analytics.model.volatility.surface;
import it.unimi.dsi.fastutil.doubles.DoubleArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedSet;
import org.apache.commons.lang.ArrayUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.collect.Sets;
import com.opengamma.OpenGammaRuntimeException;
import com.opengamma.analytics.financial.model.volatility.smile.fitting.HestonModelFitter;
import com.opengamma.analytics.financial.model.volatility.smile.function.HestonVolatilityFunction;
import com.opengamma.analytics.math.curve.NodalDoublesCurve;
import com.opengamma.analytics.math.interpolation.FlatExtrapolator1D;
import com.opengamma.analytics.math.interpolation.GridInterpolator2D;
import com.opengamma.analytics.math.interpolation.Interpolator1DFactory;
import com.opengamma.analytics.math.interpolation.LinearInterpolator1D;
import com.opengamma.analytics.math.matrix.DoubleMatrix1D;
import com.opengamma.analytics.math.matrix.DoubleMatrix2D;
import com.opengamma.analytics.math.statistics.leastsquare.LeastSquareResultsWithTransform;
import com.opengamma.analytics.math.surface.InterpolatedDoublesSurface;
import com.opengamma.core.marketdatasnapshot.VolatilitySurfaceData;
import com.opengamma.engine.ComputationTarget;
import com.opengamma.engine.function.AbstractFunction;
import com.opengamma.engine.function.FunctionCompilationContext;
import com.opengamma.engine.function.FunctionExecutionContext;
import com.opengamma.engine.function.FunctionInputs;
import com.opengamma.engine.target.ComputationTargetType;
import com.opengamma.engine.value.ComputedValue;
import com.opengamma.engine.value.ValueProperties;
import com.opengamma.engine.value.ValuePropertyNames;
import com.opengamma.engine.value.ValueRequirement;
import com.opengamma.engine.value.ValueRequirementNames;
import com.opengamma.engine.value.ValueSpecification;
import com.opengamma.financial.analytics.model.InstrumentTypeProperties;
import com.opengamma.financial.analytics.volatility.fittedresults.HestonFittedSurfaces;
import com.opengamma.id.UniqueId;
import com.opengamma.util.money.Currency;
import com.opengamma.util.tuple.DoublesPair;
import com.opengamma.util.tuple.ObjectsPair;
/**
*
*/
public class HestonFourierIRFutureSurfaceFittingFunction extends AbstractFunction.NonCompiledInvoker {
private static final Logger s_logger = LoggerFactory.getLogger(HestonFourierIRFutureSurfaceFittingFunction.class);
private static final double ERROR = 0.001;
private static final HestonVolatilityFunction HESTON_FUNCTION = new HestonVolatilityFunction();
private static final DoubleMatrix1D HESTON_INITIAL_VALUES = new DoubleMatrix1D(new double[] {1.5, 0.1, 0.1, 0.5, 0.0});
private static final LinearInterpolator1D LINEAR = (LinearInterpolator1D) Interpolator1DFactory.getInterpolator(Interpolator1DFactory.LINEAR);
private static final FlatExtrapolator1D FLAT = new FlatExtrapolator1D();
private static final GridInterpolator2D INTERPOLATOR = new GridInterpolator2D(LINEAR, LINEAR, FLAT, FLAT);
@Override
public Set<ComputedValue> execute(final FunctionExecutionContext executionContext, final FunctionInputs inputs, final ComputationTarget target, final Set<ValueRequirement> desiredValues) {
final ValueRequirement desiredValue = desiredValues.iterator().next();
//currency
final Currency currency = Currency.of(((UniqueId) target.getValue()).getValue());
// future curve
final Object objectFuturePriceData = inputs.getValue(ValueRequirementNames.FUTURE_PRICE_CURVE_DATA);
if (objectFuturePriceData == null) {
throw new OpenGammaRuntimeException("Could not get futures price data");
}
final NodalDoublesCurve futurePriceData = (NodalDoublesCurve) objectFuturePriceData;
// surface
final String surfaceName = desiredValue.getConstraint(ValuePropertyNames.SURFACE);
final Object objectSurfaceData = inputs.getValue(ValueRequirementNames.STANDARD_VOLATILITY_SURFACE_DATA);
if (objectSurfaceData == null) {
throw new OpenGammaRuntimeException("Could not get volatility surface data");
}
@SuppressWarnings("unchecked")
final VolatilitySurfaceData<Double, Double> volatilitySurfaceData = (VolatilitySurfaceData<Double, Double>) objectSurfaceData;
//assumes that the sorting is first x, then y
if (volatilitySurfaceData.size() == 0) {
throw new OpenGammaRuntimeException("Interest rate future option volatility surface definition name=" + futurePriceData.getName() + " contains no data");
}
final SortedSet<Double> x = volatilitySurfaceData.getUniqueXValues();
final DoubleArrayList fittedOptionExpiryList = new DoubleArrayList();
final DoubleArrayList futureDelayList = new DoubleArrayList();
final DoubleArrayList kappaList = new DoubleArrayList();
final DoubleArrayList thetaList = new DoubleArrayList();
final DoubleArrayList vol0List = new DoubleArrayList();
final DoubleArrayList omegaList = new DoubleArrayList();
final DoubleArrayList rhoList = new DoubleArrayList();
final DoubleArrayList chiSqList = new DoubleArrayList();
final Map<DoublesPair, DoubleMatrix2D> inverseJacobians = new HashMap<DoublesPair, DoubleMatrix2D>();
for (final Double t : x) {
final List<ObjectsPair<Double, Double>> strip = volatilitySurfaceData.getYValuesForX(t);
final int n = strip.size();
final DoubleArrayList strikesList = new DoubleArrayList(n);
final DoubleArrayList sigmaList = new DoubleArrayList(n);
final DoubleArrayList errorsList = new DoubleArrayList(n);
final Double futurePrice = futurePriceData.getYValue(t);
if (strip.size() > 4 && futurePrice != null) {
final double forward = 1 - futurePrice / 100;
for (final ObjectsPair<Double, Double> value : strip) {
if (value.first != null && value.second != null) {
strikesList.add(1 - value.first / 100);
sigmaList.add(value.second);
errorsList.add(ERROR);
}
}
if (!strikesList.isEmpty()) {
final double[] strikes = strikesList.toDoubleArray();
final double[] sigma = sigmaList.toDoubleArray();
final double[] errors = errorsList.toDoubleArray();
ArrayUtils.reverse(strikes);
ArrayUtils.reverse(sigma);
ArrayUtils.reverse(errors);
final LeastSquareResultsWithTransform fittedResult = new HestonModelFitter(forward, strikes, t, sigma, errors, HESTON_FUNCTION).solve(HESTON_INITIAL_VALUES);
final DoubleMatrix1D parameters = fittedResult.getModelParameters();
fittedOptionExpiryList.add(t);
futureDelayList.add(0);
kappaList.add(parameters.getEntry(0));
thetaList.add(parameters.getEntry(1));
vol0List.add(parameters.getEntry(2));
omegaList.add(parameters.getEntry(3));
rhoList.add(parameters.getEntry(4));
inverseJacobians.put(DoublesPair.of(t.doubleValue(), 0.), fittedResult.getModelParameterSensitivityToData());
chiSqList.add(fittedResult.getChiSq());
}
}
}
if (fittedOptionExpiryList.size() < 5) { //don't have sufficient fits to construct a surface
throw new OpenGammaRuntimeException("Could not construct Heston parameter surfaces; have under 5 surface points");
}
final double[] fittedOptionExpiry = fittedOptionExpiryList.toDoubleArray();
final double[] futureDelay = futureDelayList.toDoubleArray();
final double[] kappa = kappaList.toDoubleArray();
final double[] theta = thetaList.toDoubleArray();
final double[] vol0 = vol0List.toDoubleArray();
final double[] omega = omegaList.toDoubleArray();
final double[] rho = rhoList.toDoubleArray();
final InterpolatedDoublesSurface kappaSurface = InterpolatedDoublesSurface.from(fittedOptionExpiry, futureDelay, kappa, INTERPOLATOR, "Heston kappa surface");
final InterpolatedDoublesSurface thetaSurface = InterpolatedDoublesSurface.from(fittedOptionExpiry, futureDelay, theta, INTERPOLATOR, "Heston theta surface");
final InterpolatedDoublesSurface vol0Surface = InterpolatedDoublesSurface.from(fittedOptionExpiry, futureDelay, vol0, INTERPOLATOR, "Heston vol0 surface");
final InterpolatedDoublesSurface omegaSurface = InterpolatedDoublesSurface.from(fittedOptionExpiry, futureDelay, omega, INTERPOLATOR, "Heston omega surface");
final InterpolatedDoublesSurface rhoSurface = InterpolatedDoublesSurface.from(fittedOptionExpiry, futureDelay, rho, INTERPOLATOR, "Heston rho surface");
final HestonFittedSurfaces fittedSurfaces = new HestonFittedSurfaces(kappaSurface, thetaSurface, vol0Surface, omegaSurface, rhoSurface, inverseJacobians, currency);
final ValueProperties resultProperties = createValueProperties()
.with(ValuePropertyNames.CURRENCY, currency.getCode())
.with(ValuePropertyNames.SURFACE, surfaceName)
.with(InstrumentTypeProperties.PROPERTY_SURFACE_INSTRUMENT_TYPE, InstrumentTypeProperties.IR_FUTURE_OPTION).get();
final ValueSpecification resultSpecification = new ValueSpecification(ValueRequirementNames.HESTON_SURFACES, target.toSpecification(), resultProperties);
return Sets.newHashSet(new ComputedValue(resultSpecification, fittedSurfaces));
}
@Override
public ComputationTargetType getTargetType() {
return ComputationTargetType.CURRENCY;
}
@Override
public Set<ValueRequirement> getRequirements(final FunctionCompilationContext context, final ComputationTarget target, final ValueRequirement desiredValue) {
final Set<String> surfaceNames = desiredValue.getConstraints().getValues(ValuePropertyNames.SURFACE);
if (surfaceNames == null || surfaceNames.size() != 1) {
return null;
}
final String surfaceName = surfaceNames.iterator().next();
final ValueProperties surfaceProperties = ValueProperties.with(ValuePropertyNames.SURFACE, surfaceName)
.with(InstrumentTypeProperties.PROPERTY_SURFACE_INSTRUMENT_TYPE, InstrumentTypeProperties.IR_FUTURE_OPTION).get();
final ValueRequirement surfaceRequirement = new ValueRequirement(ValueRequirementNames.STANDARD_VOLATILITY_SURFACE_DATA, target.toSpecification(), surfaceProperties);
final ValueProperties futurePriceProperties = ValueProperties.with(ValuePropertyNames.CURVE, surfaceName)
.with(InstrumentTypeProperties.PROPERTY_SURFACE_INSTRUMENT_TYPE, InstrumentTypeProperties.IR_FUTURE_PRICE).get();
final ValueRequirement futurePriceRequirement = new ValueRequirement(ValueRequirementNames.FUTURE_PRICE_CURVE_DATA, target.toSpecification(), futurePriceProperties);
return Sets.newHashSet(futurePriceRequirement, surfaceRequirement);
}
@Override
public Set<ValueSpecification> getResults(final FunctionCompilationContext context, final ComputationTarget target) {
final ValueProperties resultProperties = createValueProperties()
.with(ValuePropertyNames.CURRENCY, target.getUniqueId().getValue())
.withAny(ValuePropertyNames.SURFACE)
.with(InstrumentTypeProperties.PROPERTY_SURFACE_INSTRUMENT_TYPE, InstrumentTypeProperties.IR_FUTURE_OPTION).get();
final ValueSpecification resultSpecification = new ValueSpecification(ValueRequirementNames.HESTON_SURFACES, target.toSpecification(), resultProperties);
return Sets.newHashSet(resultSpecification);
}
}