Release notes.txt

Accord.NET Framework 3.0.0 release notes
-----------------------------------------
16.05.2015.

Version updates and fixes:
  - GC-70: Merge with AForge.NET.

* General
  - This release marks a milestone in the Accord.NET Framework. Starting from this
    release, the AForge.NET Framework has been incorporated directly in the project,
	meaning that we are now free to fix, maintain, transform and improve AForge.NET
	directly.

  - This release provides most of the AForge.NET namespaces unchanged. This means
    that this specific version of Accord.NET Framework can be used as drop-in
	replacement in any project currently using the AForge.NET Framework and that
    is willing to upgrade to Accord.NET sometime in the future.

  - This release is mostly a transition release to help projects using the AForge.NET
    framework make the transition to Accord.NET more easily. Further releases will be
	aimed at improving the interaction between the two codebases and streamlining the
	provided functionality.




Accord.NET Framework 2.15.0 release notes
-----------------------------------------
01.05.2015.

Version updates and fixes:
  - GC-56:  Reuse decision attributes in the C4.5 algorithm for decision trees;
  - GC-109: The GoldfarbIdnani optimizer does not optimize well some problems;
  - GH-24:  Disentangling unit test projects and adding a LGPL-only project;
  - GH-57:  Decision trees created using C4.5 depends on the sorting order;
  - GH-58:  SURF detector might generate Divide By Zero exceptions;
  - GH-60:  Regularization breaks LogisticRegressionAnalysis in 2.14;
  - GH-61:  SVM code that worked with version 2.11 now fails to converge;
  - GH-64:  Exception in KPCA when using jagged matrices;
  - GH-69:  Fix K-Means deserialization between framework versions.
  
* General
  - Upgrading solution to VS2013 and adding support for .NET 4.5;
  - Packaging scripts can now create NuGet symbol packages;
  - The framework can now be built using Mono.

* Accord.Statistics
  - Correcting Circular statistics' AngularDeviation method;
  - Correcting kernel profile functions and their gradient;
  - Improving the precision of the Binomial distribution;
  - Improving sample generation for Poisson and Rayleigh distributions;
  - Updating all univariate distributions to support sample generation;
  - Making sure all probability distributions implement IFormattable;
  - Adding Generalized Beta distribution with PERT estimation;
  - Adding the von-Mises Fisher distribution for circular data;
  - Adding sample generation in Beta and Generalized Beta distributions;
  - Adding estimation using the Method-of-moments and Maximum Likelihood;
  - Adding support for weighted samples in LogisticRegressionAnalysis;
  - Adding a named constructor to create an Analysis from summary data;
  - Adding all missing Shapiro-Wilk distribution's methods;
  - Adding a common interface for radial basis function kernels;
  - Adding a new generic Gaussian kernel for creating composite kernels;
  - Adding a Windowing filter in the Statistics filters namespace;
  - Adding support for weighted samples in LogisticRegressionAnalysis;
  - Adding a named constructor to create an Analysis from summary data;
  - Adding Multinomial Logistic Regression Analysis.

* Accord.Math
  - Updating Augmented Lagragian to detect more accurately 
    when the inner optimization algorithm has diverged;
  - Adding a new Fast Fourier Transform (FFT) implementation for general 
    matrices and vectors whose dimensions are not necessarily powers of 2;
  - Adding Hellinge and Levenshtein distances for generic arrays;
  - Adding jagged-matrix version of the QR and Eigenvalue decompositions.

* Accord.MachineLearning
  - Updating tree inducing algorithms (ID3 and C4.5) se they can reuse
    decision variables multiple times when creating a decision tree;
  - Correcting Levenberg-Marquardt's chain-rule Jacobian calculation 
    when there are many output neurons in the learned neural network;
  - Updating the way SVM learning algorithms detect whether a machine is linear or not;
  - Updating SVM learning algorithms to use an heuristic value for 
    C by default unless it has been manually specified by the user;
  - Updating the linear kernels so they are created without a constant term by default;
  - Improving multi-class SVM to generate more user-friendly stack traces when
    an exception occurs during the learning of one of the binary sub-problems;
  - Updating Kd-Trees to use interval heaps instead of general .NET structures;
  - Adding Nu-SVMs based on LibSVM's quadratic programming solver.

* Accord.Neuro
  - Updating Levenberg-Marquardt to avoid setting lambda to zero. 

* Accord.Imaging
  - Updating IntegralImage to work with In64 matrices to avoid overflows;
  - Correcting Variance, Sauvola and Niblack threshold filters;
  - Adding Fast Variance, Wolf-Joulion Threshold, RG Chromaticity and 
    Objective fidelity filters.

* Accord.IO
  - Integrating and repackaging Sebastien Lorion's Fast CSV Reader into the Accord.IO
    namespace with an added support for auto-detecting the file's field delimiter.

* Accord.Audio
  - Adding IWindow apply overloads to operate directly on double[] vectors;
  - Adding Sine and Custom signal generators and correcting existing ones.
  
* Sample applications
  - Adding feature selection sample application using L1-regularized logistic SVMs;
  - Correcting the display of all sample applications in high-DPI displays.




Accord.NET Framework 2.14.0 release notes
-----------------------------------------
15.12.2014.

Version updates and fixes:
  - GH-29: HiddenConditionalRandomField is not correctly serialized;
  - GH-31: Adding hidden Markov Model methods for computing the probability of 
           a state assuming a particular value inside an observation sequence;
  - GH-36: Extensions class collides with the Accord.NET Extensions Framework;
  - GH-35: Distribution issue with .NET 3.5 assemblies;
  - GH-37: Adding Taylor series functions and dissimilarity functions;
  - GH-42: Adding new contributed distance functions;
  - GH-46: Optimization functions and constraints to now support different cultures;
  - GH-48: Fix calculation of log likelihoods for BaumWelch learning algorithm;
  - GC-33: GoldfarbIdnaniQuadraticSolver class failed to give correct answer.

* Accord.Core
  - Adding Red-Black trees and a Red-Black dictionary based on those trees
    with support for efficiently searching for maximum and minimum elements.

* Accord.IO
  - Updating the IDX reader to automatically convert between different data types.

* Accord.Math
  - Adding the Nelder-Mead and Subplex non-linear optimization algorithms;
  - Adding matrix padding methods (adding extra rows and columns with zeros);
  - Updating quadratic optimization constraints to support tolerance parameters.

* Accord.Statistics
  - Adding regularization in IterativeReweightedLeastSquares;
  - Adding DistributionAnalysis for estimating distributions from observed data;
  - Adding weighted measure methods in Statistics.Tools that are 
    based on element repetitions rather than element importance;
  - Adding Anderson-Daring, Shapiro-Wilk, Inverse Chi-Square, Lévy, Folded 
    Normal, Shifted Log-Logistic, Kumaraswamy, Trapezoidal, U-quadratic and
    BetaPrime distributions;
  - Adding Anderson-Daring and Shapiro-Wilk hypothesis tests;
  - Correcting the MarkovMultivariateFunction constructor for 
    explicit Independent<NormalDistribution> hidden Markov models;
  - Correcting discrete Viterbi learning convergence check and unifying 
    the Viterbi implementations for discrete and continuous variables;
  - Correcting the calculation of log likelihoods in Baum Welch learning;
  - Correcting serialization issue with DynamicTimeWarping kernel;
  - Updating all distribution functions constructors to offer Range attributes
    that can be used to automatically determine valid values for its parameters;
  - Updating Logistic Regression and Cox's Proportional Hazards 
    analyses to avoid computing LR-ratio tests unless necessary;
  - Updating Multivariate Empirical Distributions to support CDF;
  - Updating Empirical Distributions to support weighted samples;
  - Updating CRF output feature functions to activate only once per sequence;
  - Updating all probability distributions to offer a Generate method;
  - Updating ChiSquare Test to support testing against continuous distributions;
  - Updating univariate discrete distributions with Quantile Density functions.

* Accord.MachineLearning
  - Adding LIBLINEAR's linear support vector regression (SVR) algorithms;
  - Adding LinearCoordinateDescent for the primal formulation and renaming the 
    previous coordinate descent algorithm to LinearDualCoordinateDescent;
  - Adding named constructors in Naive Bayes to build Gaussian models more easily;
  - Updating Naive Bayes classifiers to estimate component variables in parallel;
  - Updating ID3 algorithm so attributes can join multiple times a decision;
  - Updating Bag-of-Visual-Words to avoid computing costly cluster measures;
  - Updating K-Means to support setting algorithm options through its class itself;
  - Updating K-NearestNeighbor feature matching to use KD-Trees when its possible;
  - Updating error-based pruning to avoid computing modes when there are no elements;
  - Updating K-Modes to select modes per column, instead of entire elements. Now it 
    is also possible to use the Kmeans++ initialization scheme in this algorithm.
 
* Accord.Neuro
  - Adding Rectified Linear activation functions.

* Accord.Imaging
  - Fixing Niblack and Sauvola thresholding algorithms for 8bpp images.

* Accord.Audio
  - Adding a Volume adjustment filter for audio signals.

* Accord.Controls
  - Adding a DataBarBox visualization box;
  - Updating visualizations to offer more flexibility in customizing ZedGraph charts;

* Sample applications
  - Adding support for adjusting volume in the Recorder sample application.




Accord.NET Framework 2.13.1 release notes
-----------------------------------------
30.08.2014.

Version updates and fixes:
  - GC-61: GoldfarbIdnani should implement the IOptimizationMethod interface;
  - GC-63: Updating optimization methods to avoid throwing exceptions;
  - GC-80: Audio.Formats.WaveDecoder.AverageBitsPerSecond should be bytes, not bits;
  - GC-85: Tools.Random is not thread safe;
  - GC-87: Add a base distance method for kernel functions;
  - GC-88: General Discrete Distribution estimation doesn't handle negative values;
  - GC-90: EmpiricalDistribution's SmoothingRule should use +0.2 in the factor calculation;
  - GC-91: Update L-BFGS optimization algorithms from the latest Fortran source algorithms;
  - GC-96: ConvexHullDefects doesn't accounts for defects between the last and first points;
  - GC-98: Fixing ProbabilityDensityFunction in MultivariateNormalDistribution;
  - GC-99: Combinatorics.Permutations(array) method does not include the original array;
  - GC-101: Issue with Haar transform at orders grater than one;
  - GH-04: Replacing SlimDX with SharpDX in Audio libraries;
  - GH-05: ComplexSignalConstructor unit test fails;
  - GH-07: Fixing typos in Haralick algorithm;
  - GH-08: Updating IntegralImage2 to support Format32bppRgb images;
  - GH-09: Binomial probability mass function result differs from Excel result;
  - GH-10: Fixing issue in Singular value decomposition clone method;
  - GH-11: Fixing issue in Statistics.Filters.Codification.Translate method;
  - GH-12: Add a HistogramBox viewer in the same spirit as ScatterplotBox and DataGridBox;
  - GH-13: NaiveBayes constructor incorrectly checks its arguments;
  - GH-25: SauvolaThreshold and NiblackThreshold filter are always making whole black image;
  - GH-27: Fixing Bernoulli distribution sampling.

* General
  - This release brings some big changes. The SlimDX libraries have been replaced by SharpDX, 
    which now enables the framework to be run into more platforms. Two new assemblies have also 
    been created to further accommodate future framework extensions, such as a dedicate matrix
    format library, and an additional library for math algorithms that are not available under 
    the LGPL. As such, the former Accord.Statistics.Formats namespace has been moved into the
    new Accord.IO, and a new Accord.Math.NonCommercial assembly has been created to contain
    other algorithms that are free but are not shared under a free software license and thus 
    cannot be used in commercial applications.

* Accord.IO
  - Adding a LibSVM's file model to load and save LibSVM's classifiers;
  - Adding a IDX file reader to read the MNIST (and possibly others) datasets;
  - Adding a MAT file reader to read Matlab/Octave data, including sparse,
    structures and objects.
    
* Accord.Statistics
  - Fixing Codification filter when columns have a max-length constraint;
  - Fixing MultivariateNormalDistribution to handle edge cases;
  - Fixing distance computations for most kernel functions;
  - Updating Hidden Markov Model classes with more Debug assertions;
  - Updating descriptive analysis to support quantile computation;
  - Adding Deviance measure in the DescriptiveAnalysis;
  - Adding a IReverseDistance interface to separate distinct kernel distances;
  - Adding support for directly processing matrices in the Normalization filter;
  - Adding support for explicit feature space transformation in some kernels;
  - Adding Beta and Pareto distribution fitting;
  - Adding explicit Gaussian kernel projection using a Taylor approximation;
  - Adding Birnbaum-Saunders, Generalized Normal, Gumbel, Power Lognormal, 
    Power Normal, Triangular, Tukey Lambda, Logistic, Hyperbolic Secant,
    Degenerate and General Continuous distributions.

* Accord.Imaging
  - Adding new user-contributed imaging filters: Difference of 
    Gaussians, HighBoost, Niblack Threshold, Sauvola Threshold.

* Accord.Math
  - Introducing the Accord.Math.Integration namespace for numerical integration;
  - Updating FiniteDifferences to support any order and number of interpolation points;
  - Fixing NonnegativeFactorization when smaller rank approximations are requested;
  - Updating the previous L-BFGS implementation from the latest Lbfgsb.3.0 version;
  - Adding the L-BFGS optimizer with support for Orthant-Wise optimizer from LibBFGS;
  - Adding the Cobyla method for derivative-free optimization (user contribution);
  - Adding Carl Edward Rasmussen's FminCG conjugate gradient minimizer (user contribution);
  - Adding the Discrete Curve Evolution algorithm (user contribution);
  - Adding a Singular value decomposition implementation for Jagged matrices;
  - Adding a simple 2D Kalman filter implementation (user contribution);
  - Adding an 'online' version of the TruthTable method which can generate samples on the fly
    through IEnumerable. Now it can also work with any number of symbols per element position.

* Accord.Audio
  - Fixing position calculation when sampleIndex is set in WindowBase.Apply method.

* Accord.MachineLearning
  - Fixing SequentialMinimalOptimization when working with weighted samples;
  - Renaming ProbabilisticOutputLearning to ProbabilisticOutputCalibration;
  - Updating cross-validation to support class-balanced partitions;
  - Adding support for different sample weights in SMO and and IRLS;
  - Adding a configurable model threshold for AdaBoost learning;
  - Adding a generic base model for AdaBoost's weak classifiers;
  - Adding specialized linear SVM algorithms based on liblinear's offerings, 
    such as L2-regularized L1 and L2-loss SVM for the dual formulation and
    the L2-regularized, L2-loss SVM for the primal formulation, as well as
    probabilistic SVM and Logistic Regression algorithms.

* Accord.Controls
  - Adding HistogramBox for displaying histograms in the same manner as MessageBox;
  - Updating Scatterplot to allow for constructing a plot from a single parameter.



Accord.NET Framework 2.12.0 release notes
-----------------------------------------
04.01.2014.    

Version updates and fixes:
  - GC-83: Error in Accord.Statistics.Tools;
  - GC-81: Redundant condition check in specialized Inverse method;
  - GC-82: Serializable annotation is needed on class contrast functions;
  - GC-66: Adding fitting options for empirical distributions.

* General
  - The general focus for this release was again to improve 
    the documentation and provide standard bug-fixing;
  - The project now also provides Debug binaries which be used
    to provide more detailed information when debugging applications.

* Accord.Controls
  - Adding a WavechartBox control to display wavecharts with ease, in 
    the same way as MessageBox can display text messages on screen.

* Accord.Audio
  - Correcting WaveDecoder.AverageBytesPerSecond (Google Code #80);
  - Correcting the creation of base audio windows;
  - Adding the ExtractChannel filter for extracting single channels
    from multiple-channel audio signals.

* Accord.Statistics
  - Adding generic base classes for probability distributions;
  - Adding support for computing the cumulative multivariate normal 
    distribution function for specifically one and two dimensions;
  - Correcting behavior of the Binomial test under .NET 4.5;
  - Updating DescriptiveAnalysis to provide sums and confidence intervals;
  - Updating ChiSquareTest to accept ConfusionMatrices as input;
  - Unifying Univariate and Multivariate mixture distribution fitting
    through Expectation-Maximization into a single and generic class;
  - Updating the WeightedMean method to accept unnormalized weights;
  - Updating the Codification filter to work without DataTables;
  - Adding fitting options for empirical distributions (Google Code #66);
  - Adding options to robustly fit Multivariate Normal Distributions using 
    the Singular Value Decomposition, avoiding non-positive definite issues. 

* Accord.MachineLearning
  - GaussianMixtureModel now accepts a maximum number of iterations;
  - Updating the KDTree class to provide a non-generic version when there 
    is no interest in the kind of values stored as information in the nodes;
  - Adding specialized methods for when only the closest neighbor is needed
    in a KDTree. Also adding options to provide only an approximate answer;
  - Updating the K-Means algorithm to fully support parallel processing;
  - Adding support for generating decision rules from Decision Trees.

* Accord.Math
  - Correcting InsertColumn and InsertRow implementations;
  - Improving Submatrix creation to avoid extra memory allocations when desired;
  - Reshape method for jagged arrays can now work with non-rectangular arrays;
  - Correcting relative convergence issues with negative watched interest values;
  - Adding Modulo and Modular distance for double-precision floating point inputs.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.5. May work with newer versions.



Accord.NET Framework 2.11.0 release notes
-----------------------------------------
27.10.2013.    

Version updates and fixes:

* General
  - The general focus for this release was to improve the documentation, 
    re-organize the sample applications and provide standard bug-fixing.

* Accord.Controls
  - Fixing ArrayDataView to show jagged arrays in DataGridViews;
  - Adding a ComponentView control to display analysis information.

* Accord.Imaging
  - Adding a Save overload to BagOfVisualWords (Google Code #74);
  - Marking FAST and FREAK as Serializable (Google Code #75).

* Accord.Statistics
  - Improving documentation for the 'unbiased' parameter (Google Code #66);
  - Removing the DEBUG flag from the Statistics assembly (Google Code #78);
  - Adding NonlinearRegression models and least-squares learning algorithms;
  - Adding a option to force the use of SVD when fitting linear regressions;
  - Adding a option to disable normalization when creating Cox's models;
  - Adding MultipleBaumWelchLearning to test random weight initializations;
  - Updating HCRF learning algorithms to use relative convergence by default.

* Accord.MachineLearning
  - Correcting the score generation on k-NN classifier (Google Code #68);
  - Fixing the Compact property of the SequentialMinimalOptimization class;
  - Correcting the KD-Tree implementation to correctly identify all neighbor
    points when querying for a finite number of neighbors (Google Code #71).

* Accord.Math
  - Adding the Gauss-Newton and Levenberg-Marquardt Least-Squares algorithms;
  - Updating Absolute and Relative Convergence to implement a common interface;
  - Adding a configurable minimum convergence checks in relative convergence.

* Sample applications
  - Reorganizing all sample applications, adding more relevant information
    to their description and improving their documentation.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.5. May work with newer versions.




Accord.NET Framework 2.10.0 release notes
-----------------------------------------
07.09.2013.    

Version updates and fixes:

* General
  - This release aimed to provide improvements to the documentation. 
    Most of the Univariate Distributions now include proper examples
    for all main functions and measures in their summary page.

* Accord.Imaging
  - Adding Haralick's set of textural features;
  - Adding Local Binary Pattern (LBP) features;
  - Adding Gabor, Variance and Kuwahara filters;
  - Adding Gray-World, WhitePatch filters;
  - Adding Kirsch and Robinson edge detectors;
  - Adding Gray-Level Co-occurrence Matrices (GLCM);
  - Adding Gray-Level Run-length Matrices (GLRLM);
  - Adding Gray-Level Difference Method (GLDM);
  - Adding byte and color conversions in the ArrayToImage converter;
  - Updating IFeaturePoint's to include better conversion operators.

* Accord.Statistics
  - Adding random Covariance matrix generation methods;
  - Adding Von-Mises cumulative distribution function;
  - Adding Poisson inverse cumulative distribution function;
  - Adding Support information for all distributions;
  - Adding support for threshold models in Markov running filters;
  - Adding default support computing the true Median and Quantile 
    functions (inverse cumulative distribution function) for all 
    univariate continuous distributions;
  - Improving ToString methods for linear/polynomial regressions;
  - Updating all regression methods to use SVD by default;
  - Correcting Wishart and Inverse Wishart distributions.

* Accord.MachineLearning
  - Adding simple Minimum (Mean) Distance Classifier;
  - Adding RANSAC methods for plane, circle and line fitting;
  - Adding options to trade speed vs. accuracy in Mean-Shift; 
  - Updating Bag-of-Words to support any feature point type;
  - Fixing Grid-Search issue when one of the models returns NaN;
  - Fixing issue when k-Nearest Neighbors Matching is called 
    with less than k points on its second argument;
  - Improving the performance of KD-Trees and Mean Shift;
  - Updating Gaussian Mixture Model methods to report the 
    classification strength (score) as an out parameter.

* Accord.Math
  - Adding the first version of the Math.Kinematics
    namespace with Denavit-Hartenberg joint models;
  - Adding Binary Search root finding algorithm;
  - Adding missing Gamma.Inverse special function;
  - Adding Mixture Distribution's Distribution functions;
  - Adding dedicated class for Gram-Schmidt Orthogonalization;
  - Adding general purpose Resilient Backpropagation algorithm; 
  - Fixing precision-loss issue in the Augmented Lagrangian Solver;
  - Updating FiniteDifferences to support configurable step sizes;
  - Updating Matrix.Range methods to require a dimension parameter;
  - Moving matrix formatters from Accord.Math.Formats to 
    Accord.Math in order to improve their discoverability.

* Accord.Vision
  - Moving the GroupMatching algorithms to Accord.Vision.

* Sample applications
  - Adding sample application for Denavit-Hartenberg joint models;
  - Adding sample application for Eigenfaces, PCA for images;
  - Adding sample application for mouse gesture classification 
    using Dynamic Time Warping Kernel Support Vector Machines. 
  
* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.5. May work with newer versions.




Accord.NET Framework 2.9.0 release notes
-----------------------------------------
20.04.2013.    

Version updates and fixes:

* General
  - Updating installer to register framework libraries.

* Accord.MachineLearning
  - Adding Least-Squares Support Vector Machines (LS-SVMs);
  - Adding support for Decision Tree pruning (experimental);
  - Adding Hybrid Markov Models (experimental, use with care);
  - Adding Load and Save methods to Bag-of-Words;
  - Adding initial support for Boosting (AdaBoost);
  - Correcting k-Nearest Neighbors, KD-Trees and 
    Mean-Shift to respect non-Euclidean distances;
  - Fixing IndexOutOfRange Exception in C4.5 learning;
  - Fixing bug in k-Nearest Neighbors classifier;
  - Fixing C4.5 split when working with continuous attributes;
  - Renaming DecisionAttributeKind to DecisionVariableKind
    for better naming consistency with DecisionVariables.

* Accord.Statistics
  - Adding support for combining Confusion Matrices;
  - Updating Levene's Test to support Trimmed Mean;
  - Updating Binomial Test to use the small p-values;
  - Fixing Two-Tailed computation in Binomial test.

* Accord.Math
  - Adding Discrete Cosine, Sine and Hartley Transforms.

* Accord.Imaging
  - Adding missing overloads for image moment calculators;
  - Adding the Fast Retina Keypoint (FREAK) image descriptor;
  - Correcting Histograms-of-Oriented-Gradients;
  - Updating HaarObjectDetector to ignore Channel 
    information when working with Grayscale images.

* Accord.DirectSound
  - Adding support for recording multiple bit-rates.

* Accord.Controls
  - Adding support for Codebooks in DecisionTreeView.
  
* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.4. May work with newer versions.





Accord.NET Framework 2.8.2 release notes
-----------------------------------------
25.02.2013.    

Version updates and fixes:

* Accord.MachineLearning
  - Adding several K-d tree traversal methods;
  - Adding support for generating decision tree assemblies;
  - Adding maximum height option for ID3 and C4.5 learning;
  - Adding a generic Bag-Of-Words to accept other feature detectors;
  - Updating DecisionVariable to initialize itself from a Codebook;
  - Fixing C4.5 learning when presented with constant variable inputs;
  - Fixing and normalizing the name of cluster identification methods.
  
* Accord.Statistics
  - Adding support for opening binary streams in ExcelReader;
  - Adding support for generalized linear regression models;
  - Adding support for integer observations in generic density HMMs;
  - Fixing Levene's test to behave as a one-tailed test;
  - Fixing Stepwise Logistic Regression's result property;
  - Fixing HMM classifier rejection using Threshold models;
  - Fixing ConfusionMatrix's ToGeneralMatrix method so it respects
    the expected order of elements in the contingency table.

* Accord.Math
  - Adding Discrete Cosine, Sine and Hartley Transforms.

* Accord.Imaging
  - Adding Hu's set of invariant image moments;
  - Adding k-nearest neighbors feature point matching;
  - Adding an early, experimental version of the Histograms of
    Oriented Gradients (HOG) descriptors due to popular demand;
  - Correcting image converters for different pixel sizes.

* Accord.DirectSound
  - Adding support for capturing audio in different bit resolutions.
  
* Accord.Controls
  - Fixing the initialization of ScatterplotView.
  
* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.4. May work with newer versions.




Accord.NET Framework 2.8.1 release notes
-----------------------------------------
21.12.2012.    

Version updates and fixes:

* General
  - Working on more source code examples for the documentation.

* Accord.Math
  - Adding Levenshtein distance for strings.

* Accord.Imaging
  - Updating BagOfVisualWords to be fully serializable.

* Accord.MachineLearning
  - Adding K-dimensional trees (K-d trees);
  - Adding Mean-Shift clustering algorithm;
  - Adding support for weights in Gaussian Mixture Models;
  - Correcting the name of the K-Nearest Neighbors algorithm;
  - Improving K-Nearest Neighbors for double[] using a K-d tree;
  - Changing K-Nearest Neighbors generic argument to represent the 
    instance type rather than the type of the array of instances.

* Accord.Statistics
  - Adding interfaces for density estimation kernels;
  - Adding Gaussian, Epanechnikov, Uniform density kernels;
  - Adding Bartlett's and Levene's tests for variances;
  - Adding hypothesis tests for comparing ROC curves;
  - Adding support for scatter plot generation directly from ROC curves;
  - Adding running Markov models and running Markov classifier filters;
  - Adding stochastic gradient descent learning for logistic regression models;
  - Updating Two-Sample Kolmogorov to work with number of samples in double-precision;
  - Correcting standard error calculation in Paired T-Tests.

* Accord.Neuro
  - Adding Boltzmann Machines, Contrastive Divergence Learning and Deep Neural Networks.

* Accord.Vision
  - Adding rectangle averaging support in the Haar object detector.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.4. May work with newer versions.




Accord.NET Framework 2.8.0 release notes
-----------------------------------------
06.11.2012.    

Version updates and fixes:

* General
  - Adding support for previous versions of the .NET framework (3.5).

* Accord.Audio
  - Fixing finalizers to avoid disposing null object references.

* Accord.Math
  - Adding Absolute and Relative convergence classes;
  - Adding Algorithm Environments to the Math project;
  - Fixing SVD precision when solving ill-conditioned problems.

* Accord.Statistics
  - Reorganizing the (Hidden) Conditional Random Fields namespace;
  - Adding Forward-Backward Gradient calculator for linear-chain HCRFs;
  - Adding Cox's Proportional Hazards and Partial Newton-Raphson estimation algorithm;
  - Adding Gompertz and Empirical Hazard Distributions;
  - Adding Weighted Confusion Matrix and Weighted Kappa;
  - Adding support for Weighted Kappa in Kappa tests;
  - Fixing class balancing in the Grouping filter;

* Accord.MachineLearning
  - Marking DecisionAttributeCollection as Serializable;
  - Updating Multi-class and Multi-label SVMs to implement the IEnumerable interface;
  - Updating Multi-class SVM decision to be thread-safe in multithreaded environments;
  - Adding explicit class count parameter to KNearestNeighbors;
  - Adding Bag-of-Words model for text categorization;
  - Fixing SMO when there is only one class label in outputs;
  - Fixing set size counting in Cross-Validation.

* Accord.Controls
  - Updating Confusion Matrix View to display Actual and Expected labels.

* Accord.Imaging
  - Fixing an issue with PointH transform method.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.4. May work with newer versions.




Accord.NET Framework 2.7.1 release notes
-----------------------------------------
01.09.2012.    

Version updates and fixes:

* Accord.Statistics
  - Adding data processing filters for data randomization,
    branching, grouping, elimination and imputation;
  - Adding Precision, Recall and F-Score in Confusion matrix; 
  - Adding GrandMean calculation in Statistics.Tools;
  - Adding the Negative Binomial, Pareto, Laplace, Inverse
    Gamma, Beta, Wishart, Inverse Wishart, Dirichlet distributions;
  - Adding the Two Proportion Z-Test, Paired T-Test and Multinomial test
  - Correcting Noncentral T distribution pdf calculation; 
  - Correcting Skewness and Kurtosis calculations; 
  - Correcting ANOVA when groups have different sizes;
  - Adding support for newer Excel versions in ExcelReader;
  - Adding support for different sample weights in HMM learning;
  - Adding distinct elements calculation in DescriptiveAnalysis;
  - Adding standalone Standard Error computation for ROC curves. 

* Accord.MachineLearning
  - Redesigning clustering framework to accommodate the
    Binary-Split algorithm, K-Means, K-Modes and GMMs;
  - Adding support for cancellation in SVM learning;
  - Adding support for different class weights in SMO;

* Accord.Controls
  - Adding Confusion Matrix viewer;
  - Adding numeric collection editor.

* Accord.Imaging
  - Adding Mean and Standard Deviation for images.

* Accord.Vision
  - Marking TrackingObject as Serializable.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.4. May work with newer versions.




Accord.NET Framework 2.7.0 release notes
-----------------------------------------
08.07.2012.    

Version updates and fixes:

* Accord.Statistics
  - Standardizing statistical tests hypotheses;
  - Adding power analysis for statistical tests;
  - Adding Fisher's exact test for contingency tables;
  - Adding Multiple-Matrix Kappa and Average Kappa tests;
  - Adding Binomial tests, Sign tests, Wilcoxon and Mann-Whitney tests;
  - Adding Noncentral T, Wilcoxon's W and Mann-Whitney's U distributions;
  - Adding Multiple Linear Regression Analysis with ANOVA statistics;
  - Adding inverse distribution calculation in the T-Distribution;
  - Adding the unsupervised Viterbi learning and the supervised
    Maximum Likelihood Estimation learning for hidden Markov models;
  - Adding Generate methods for sampling from hidden Markov models;
  - Marking several Statistics.Tools methods as extension methods;
  - Introducing the ISampleableDistribution interface for probability
    distributions and adding generate methods for most distributions;
  - Correcting variance calculation for Cohen's Kappa, adding variants
    for the null hypothesis and the calculation using the Delta method;
  - Correcting F-Distribution ComplementaryDistributionFunction;
  - Correcting Kernel Principal Component Analysis bug when auto-
    selecting the maximum number of components;
  - Resolving naming confusion in KMeans, renaming Classify to Nearest;
  - Renaming ContinuousUniformDistribution to UniformContinuousDistribution;
  - Renaming DiscreteUniformDistribution to UniformDiscreteDistribution;
  - Renaming Random to RandomSample for clarity;
  - Updating MultipleLinearRegression to use a single SVD;
  - Updating Covariance method with two variables to generate
    a covariance value rather than a 2x2 covariance matrix;
  - Renaming IMultipleRegressionAnalysis interface to the
    more adequate name IMultivariateRegressionAnalysis;
  - Renaming ConfusionMatrix.Observations to .Samples to  
    maintain consistency with the GeneralConfusionMatrix.

* Accord.MachineLearning
  - Adding Bootstrap for generalization performance estimation;
  - Adding the K-Modes clustering algorithm for discrete data;
  - Optimizing both memory usage and performance for Sequential
    Minimal Optimization learning and the kernel function cache.

* Accord.Math
  - Adding Brent Search Root Finding Algorithm;
  - Adding Combinatorics class for permutations and combinations;
  - Fixing a bug in Goldfarb-Idnani Quadratic Solver;
  - Adding Trigamma function to Gamma class;
  - Adding array format providers.

* Accord.Controls
  - Adding ScatterplotBox class for displaying point data; DataGridBox for
    displaying tabular data; and DataSeriesBox to display series data in the
    same way as Windows.Forms's MessageBox can be used to display text data;
  - Adding extension method for enabling DataGridViewColumns nested properties;
  - Adding ImageBox overloads to work with images represented in matrix form.

* Accord.Imaging
  - Adding the Bag of Visual Words (BoW) feature extractor;
  - Renaming SpeededUpRobustFeatures (SURF) classes avoiding acronyms.
  - Updating FeaturesMarker to make it work with indexed images.

* Sample applications
  - Adding image classification sample application;
  - Updating Regression sample application to include
    more information for linear regression analysis.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.4. May work with newer versions.




Accord.NET Framework 2.6.1 release notes
-----------------------------------------
05.05.2012.    

Version updates and fixes:

* General
  - The project's website has moved. This minor release updates all
    references to reflect the new project URL and includes only some new
    additions and fixes. The project is now being hosted at Google Code.

* Accord.MachineLearning
  - Adding Multi-label Support Vector Machines;
  - Adding K-Nearest Neighbor (k-NN) classifiers;
  - Adding linear elimination Support Vector Reduction;
  - Correcting SVM serialization compatibility.

* Accord.Statistics
  - Adding named constructors in PCA to create analysis
    directly from covariance or correlation matrices;
  - Adding support for adjusting the rejection threshold
    in Hidden Markov Classifiers with threshold models;
  - Updating Center, Standardize and ZScores methods so
    they are not in-place by default.

* Accord.Math
  - Adding Augmented Lagrangian solver for Non-linear programming problems;
  - Adding Row-reduced Echelon Form reductor.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.4. May work with newer versions.




Accord.NET Framework 2.6.0 release notes
-----------------------------------------
05.04.2012.    

Version updates and fixes:

* General
  - Introducing experimental NuGet packages.

* Accord.Statistics
  - Adding class features to HCRF potential functions;
  - Adding resilient gradient (RProp) learning for HCRFs;
  - Adding notifications for HMM classifier learning;
  - Adding non-stochastic mode for GradientDescentHiddenLearning;
  - Adding notifications for stochastic and conjugate gradient learning;
  - Adding optimizations for HMM-based linear-chain HCRFs;
  - Implementing ICloneable in all CRF/HCRF related classes;
  - Updating positive definite checks in Cholesky decompositions;
  - Correcting HMM computations to normalize probabilities only if required;
  - Correcting DistributionBase to be marked as serializable;
  - Correcting catastrophic cancellation in HCRF evaluation;
  - Correcting output feature marginal probability calculation;
  - Correcting Phi and ChiSquare calculation in GeneralConfusionMatrix;
  - Renaming BaseSequenceClassifierLearning to BaseHiddenMarkovClassifierLearning.

* Accord.MachineLearning
  - Adding pooled variance support for Cross-Validation;
  - Adding a switch to disable parallel computations in Cross-Validation;
  - Adding support for external initialization in  Cross-Validation;
  - Adding support for compact form linear SVMs;
  - Adding kernel function cache in SVMs and SMO;
  - Adding notification events to multi-class SVM learning;
  - Adding Keerthi et al. improvements to the SMO algorithm;
  - Splitting Cross-Validation and Grid-Search classes in different files;
  - Splitting Multiquadric and InverseMultiquadric kernels;
  - Correcting Multiquadric kernel to be positive-definite;
  - Optimizing multi-class SVM evaluation based on DAGs.

* Accord.Math
  - Adding the Goldfarb-Idnani solver for constrained QP problems.

* Accord.Imaging
  - Adding further options to disable gradient blending in Blend filter;
  - Adding image rectification filter for projective transformations;
  - Adding specialized RANSAC fundamental matrix estimator.

* Sample applications
  - Adding Solver sample application for constrained optimization problems.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.4. May work with newer versions.




Accord.NET Framework 2.5.0 release notes
-----------------------------------------
20.01.2012.    

Version updates and fixes:

* Accord.Math
  - Splitting Special class into smaller classes;
  - Moving ComplexMatrix to ComplexExtensions namespace.

* Accord.Statistics
  - Introducing Accord.Statistics.Links namespace for link functions;
  - Adding Absolute, Cauchit, Identity, Inverse, Inverse Squared,
    Logit, Log, Log-log, Probit and Sin link functions;
  - Adding IFittableDistribution interface to eventually replace
    the functionality of IDistribution.Fit in a future version;
  - Adding Gamma, Cauchy, InverseGaussian, Hypergeometric, Geometric,
    Exponential, Binomial and Kolmogorov-Smirnov probability distributions;
  - Adding InverseDistributionFunction to most Univariate distributions;
  - Adding ComplementaryDistributionFunction for all IDistributions;
  - Adding HypothesisTest interface for specifying statistical tests;
  - Adding Kolmogorov-Smirnov tests for one and two samples;
  - Adding Student's T-Test for one and two samples;
  - Adding Quartiles function to statistical tools;
  - Adding several association measures to general contingency tables;
  - Adding Bhapkar, Bowker, Kappa, McNemar, Stuart-Maxwell and Two-matrix Kappa tests;
  - Adding symmetric triangle, Squared sinc, Hypersecant and Dirichlet kernels;
  - Adding Gamma formulations to sparse Gaussian and sparse Laplacian kernels;
  - Correcting property name from LogEmissions to Emissions in Markov models.

* Accord.MachineLearning
  - Adding small optimizations to SMO such as index sets and diagonal caching;
  - Adding support vector sharing in the computation of multi-class SVMs;
  - Adding Estimate methods for Gaussian, Laplacian and Sigmoid kernels;
  - Adding probabilistic output learning and link functions to SVMs;
  - Adding elimination-based multi-class decision for multi-class SVMs (DAGs);
  - Changing default value for constant in linear and polynomial kernels to 1;
  - Changing default behavior of SVM compute in order to return decisions.

* Accord.Neuro
  - Adding linear activation function.

* Accord.Audio
  - Adding simple mode to Wavechart control;
  - Adding navigation support to WaveEncoder;
  - Correcting Wave Encoder and Decoder classes.

* Accord.Imaging
  - Adding better starting values in Image/Matrix converters.

* Sample applications
  - Updating Handwriting (SVM) sample application to use all samples
    available and to perform automatic estimation of Gaussian kernel;
  - Adding new audio recording sample application.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.3. May work with newer versions.




Accord.NET Framework 2.4.0 release notes
-----------------------------------------
04.01.2012.    

Version updates and fixes:

* General
  - Updating all projects to .NET 4.0;
  - Updating all libraries to use Task Parallel Library;
  - Updating SlimDX to latest version (September 2011);
  - Adding new project for GPL source codes.

* Accord.Audio
  - Adding WaveEncoder class for saving/encoding Wave files.

* Accord.Controls
  - Updating ArrowDataView to support row labels.

Accord.Imaging
  - Correcting Blending filter and Harris corners detector convolutions.

* Accord.MachineLearning
  - Adding Naïve Bayes classifier;
  - Adding Decision Trees models;
  - Adding ID3 and C4.5 learning algorithms for decision trees;
  - Adding Load and Save methods to all Support Vector Machines;
  - Correcting race condition in multi-class vector machine decision;
  - Renaming KMean's method "Nearest" to "Classify".

* Accord.Math
  - Adding Conjugate Gradient (CG) optimization algorithm;
  - Adding IsUpperTriangular, IsLowerTriangular, IsDiagonal methods to matrix class;
  - Adding Mode for integers and Entropy calculation in Math.Tools;
  - Adding Lambda Comparer for specifying ad-hoc comparison rules;
  - Adding LogSum function for summing exponential without losing accuracy;
  - Adding efficient trace of the inverse in Cholesky decomposition;
  - Adding jagged-array variants of Cholesky and Lu decompositions;
  - Adding single-precision and decimal variants of Cholesky, Qr,
    Eigenvalue, Singular value and Lu matrix decompositions;
  - Correcting matrix formatter to use argument culture;
  - Correcting regularized Gamma special functions;
  - Updating numeric decompositions to use T4 templates;
  - Renaming LbfgsOptimization to BroydenFletcherGoldfarbShanno;
  - Adding parallelization to LDLt Cholesky Decomposition.

* Accord.Neuro
  - Heavily optimizing Levenberg-Marquardt to lessen memory and CPU requirements;
  - Adding partial Jacobian calculation in Levenberg-Marquardt to conserve memory;
  - Adding Resilient Backpropagation (RProp) learning algorithm;
  - Renaming NguyenWidrowInitializer to NguyenWidrow.
  
* Accord.Statistics
  - Adding Conditional Random Fields (CRFs);
  - Adding Hidden Conditional Random Fields (HCRFs);
  - Adding Stochastic Gradient Descent (SGD) learning for HCRFs;
  - Adding Conjugate Gradient and QuasiNewton (L-BFGS) learning for HCRFs;
  - Renaming SequenceClassifiers to HiddenMarkovClassifiers;
  - Adding class priors to HiddenMarkovClassifiers;
  - Adding InverseGaussian, Nakagami, Rayleigh and Weibull distributions;
  - Adding Joint and Independent probability distributions;
  - Adding fitting options for GeneralDiscreteDistribution;
  - Adding LogProbabilityFunction method to all probability distributions;
  - Adding Load and Save methods for all Hidden Markov Models and Fields;
  - Updating Markov models to use log-domain computations by default;
  - Updating Normal fitting options to limit to diagonal covariance matrices; 
  - Correcting weighted mixture distribution fitting;
  - Correcting running normal statistics;
  - Correcting LDA classification function;
  - Correcting Kernel matrix centering in KPCA;
  - Correcting Backward algorithm for HMMs.

* Accord.Vision
  - Adding smoothness to Camshift image extraction;
  - Adding parallelism to Haar Object Detector;
  - Optimizing IntegralImage computation with unsafe operations.

* Sample applications
  - Adding Naive Bayes sample application;
  - Adding Decision Tree sample application;
  - Adding Classification sample application for
    Levenberg-Marquardt trained Neural Networks;
  - Adding XOR, TimeSeries and Approximation samples
    for ResilientBackpropagation trained Networks.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.3. May work with newer versions.




Accord.NET Framework 2.3.0 release notes
-----------------------------------------
01.09.2011.    

Version updates and fixes:

* General
  - Ensuring copyright information stay as complete as possible.
  
* Accord.Neuro
  - Levenberg-Marquardt now supports networks with multiple hidden layers.

* Accord.Statistics
  - Adding ANOVA and Two-way ANOVA;
  - Adding Odds Ratio, Overall Diagnostic Power and Normalized 
    Mutual Information properties for 2 x 2 confusion matrices;
  - Adding class for General Confusion Matrices (i.e. NxN confusion matrices);
  - Adding Multinomial Logistic Regression using a Lower-Bound Newton optimization;
  - Adding Predict method for arbitrary-density hidden Markov models;
  - Adding Empirical, Lognormal, T and Uniform distributions;
  - Splitting logistic regression models and related 
    fitting algorithms into independent classes;
  - Fixing Clone operation of Mixture distributions.
  - Fixing Normal distributions constructor's parameters;
  - Fixing variance calculation for multivariate mixture;
  - Replacing continuous-density hidden Markov models with generic, arbitrary-density models;
  - Correcting an infinite loop when regularization is zero in MultivariateNormalDistribution;
  - Correcting KDA to avoid argument out of range exceptions when removing unneeded components;
  - Correcting probability mass function for general discrete distribution;
  - Renaming Multivariate distributions to make a better distinction from univariate ones;
  - Renaming UniformDistribution to ContinuousUniformDistribution;
  - Updating univariate Normal to use log computations instead;
  - Adding initial class for Scatter plots.

* Accord.Math
  - Adding Kronecker product to Matrix class.

* Accord.Controls
  - Introducing ScatterplotView.

* Sample applications
  - Adding Kinect controller for interfacing with Microsoft Kinect.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.2.1. May work with newer versions.




Accord.NET Framework 2.2.0 release notes
-----------------------------------------
01.07.2011.    

Version updates and fixes:

* General
  - This release introduces some breaking interface changes. As
    result, the current minor version number has been increased;
  - Updating DimensionMismatchException to be an ArgumentException;
  - Merging Accord.Wavelets into Accord.Math.

* Accord.MachineLearning
  - Adding more argument checks in SVM learning related classes;
  - Adding a overload to initialize GMM with known distributions;
  - Adding a overload to compute K-Means errors directly from the data.

* Accord.Math  
  - Adding 1D convolution extension method in Matrix class;
  - Adding modified Bessel functions in the Special functions class;
  - Adding Finite Differences class for automatic gradient computation;
  - Adding GetAngle(IntPoint, IntPoint) and GetDirection in Math.Tools.
  - Adding new LogDeteminant properties to Cholesky and LU decompositions
    to compute the determinant's logarithm avoiding overflown values;
  - Correcting LU decomposition of matrices with more columns than rows;
  - Correcting matrix Power operation.

* Accord.Statistics
  - Adding Circular statistics tools;
  - Adding Von-Mises probability distribution;
  - Adding static methods for NormalDistribution estimation;
  - Adding Moving and Running namespaces for moving window and running statistics;
  - Adding MovingNormalStatistics class for computing moving averages and variances;
  - Adding MovingCircularStatistics class for moving circular averages and variances;
  - Adding more method overloads for float input values in Statistics.Tools;
  - Adding versions of the Forward and Backward algorithms without scaling;
  - Adding smoothing support in hidden Markov Threshold model creation;
  - Adding more argument checks in statistical analysis and models;
  - Adding base interfaces for statistical analyses;
  - Updating analyses classes to implement base interfaces;
  - Updating SequenceClassifierBase to compute the threshold model in parallel;
  - Updating Continuous Baum-Welch to automatically convert univariate distributions;
  - Updating multivariate NormalDistribution to use logarithmic computations;
  - Fixing initialization of the symbols property in Hidden Markov Model constructor;
  - Fixing univariate mixture distribution to respect component's fitting options;
  - Fixing threshold model generation in discrete sequence Markov classifiers;
  - Experimental version of linear-chain Conditional Random Fields;
  - Marking all kernel classes as sealed.
  
* Accord.Neuro
  - Correcting iterator bug in Levenberg Marquardt learning.
  
* Accord.Imaging
  - Adding Raw and Central image moments calculators;
  - Adding border following contour extraction algorithm;
  - Adding K-curvature algorithm for contour peak detection;
  - Adding convex hull defects extraction algorithm;
  - Updating PointsMarker and RectanglesMarker to accept
    any IEnumerable collection rather than just arrays.

* Accord.Vision
  - Adding HSL Range Blob Tracker for color-based tracking;
  - Adding Block Matching Tracker for template-based tracking;
  - Adding steady detection in Camshift and HaarObjectDetector;
  - Adding new classes for default Face and Nose Haar cascades;
  - Adding support for hard-coded code generation in Haar cascades;
  - Adding Axis orientation support for TrackingObject;
  - Updating TrackingObject to use integer coordinates;
  - Updating all Haar related classes to implement the ICloneable interface;
  - Splitting HaarCascade class from the HaarCascadeClassifier;
  - Fixing multi-threaded issues when using the default face detector;
  - Fixing red channel extraction in HaarObjectDetector;
  - Fixing minimum window size in HaarObjectDetector.
  
* Accord.Controls
  - Adding Accord.Controls.Vision namespace for vision related controls;
  - Adding AngleBox and PointBox controls to show angle and position information;
  - Adding HeadController component for interface control based on head events;
  - Adding FaceController component for interface control based on face events;

* Sample applications
  - Adding Controller sample application for head and face based application control;
  - Adding Glove Tracking sample application for colored glove tracking and finger detection;
  - Updating Mouse Gestures sample application to perform continuous recognition using
    hidden Markov threshold models and use discrete models instead.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.1.5. May work with newer versions.




Accord.NET Framework 2.1.6 release notes
-----------------------------------------
01.04.2011.    

Version updates and fixes:

* General
  - Introducing new exception classes for math operations.

* Accord.Audio
  - Adding new AudioDeviceCollection class to list available 
    audio devices information based on category (output or capture);
  - Updating AudioCaptureDevice and AudioOutputDevice to actually 
    support any available audio device (Origo Issue #21).
 
* Accord.MachineLearning
  - Adding methods to (re-)initialize Gaussian Mixture Models and K-Means;
  - Adding support for setting the centroids in K-Means (Origo Issue #20);

* Accord.Math
  - Adding L-BFGS method for non-linear optimization;
  - Adding optimized matrix inversions for 3x3 and 2x2 matrices; 
  - Matrix decompositions now implement the ICloneable interface;
  - Updating Multivariate/NormalDistribution to always use the
    Cholesky decomposition and throw exceptions when appropriate;
  - Updating Cholesky decomposition to cache the result of the
    determinant property to avoid unnecessary computations.

* Accord.Statistics
  - New architecture for statistical distribution fitting;
  - Adding a regularization parameter in multivariate Normal distribution
    fitting to avoid non-positive definite or singular covariance matrices;
  - Adding configurable fitting options in the ContinuousBaumWelchLearning;
  - Adding confidence support in sequence classifiers using Threshold models;
  - Adding support for inclusive upper bounds in the Histogram class;
  - Adding more selection rules for the number and widths of Histogram bins;
  - Fixing Histogram computing when data is constant (Origo Issue #23);
  - Renaming weighted sample methods from Statistics.Tools.
  
* Accord.Imaging
  - Adding Speeded-Up Robust Features (SURF) detector and descriptor;
  - Adding Features from Accelerated Segment Test (FAST) corners detector;

* Sample applications
  - Mouse gestures sample application now supports non-gesture models
    and a regularization parameter for Normal distribution estimation.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.1.5. May work with newer versions.




Accord.NET Framework 2.1.5 release notes
-----------------------------------------
12.02.2011.    

Version updates and fixes:

* General
  - The various works on this release have introduced some breaking
    interface changes, mainly in the Audio and Statistics namespaces.

* Accord.Audio
  - Major architectural changes of the Audio namespace;
  - Code cleanup of untested audio processing filters;
  - Signal processing filters now operate in more similar
    ways to AForge.NET's image processing filters;
  - Signals can now have multiple sample formats.
 
* Accord.MachineLearning
  - Updating GridSearch to use parallel computing;
  - Adding a new option to automatically compute the complexity parameter
    C using a heuristic in Sequential Minimal Optimization SVM learning.

* Accord.Math
  - Reorganizing Special functions, adding (ln) Beta functions;
  - Splitting Matrix.cs into several partial classes for organization;
  - Adding MultiplyByTranspose and TransposeAndMultiply methods for matrices;
  - Adding a new algorithm for LDLt Cholesky matrix decomposition;
  - Adding a new property in SVD to store original value sorting order;
  - Adding options for Eigenvalue and Singular value decompositions to
    be computed in place, conserving memory.

* Accord.Neuro
  - Updating LevenbergMarquardtLearning to introduce a constant factor
    while computing the Hessian/Bayesian Regularization weight update.

* Accord.Statistics
  - Major refactoring of the Statistics.Models.Markov namespace;
  - Adding a new Predict method in HMMs to predict next observations in a sequence;
  - Adding Topology classes to specify a Hidden Markov Model architecture at model
    construction, such as Ergodic (fully connected) or Forward-only (left-to-right);
  - Adding a base class and interfaces for Continuous and Discrete hidden Markov models;
  - Adding a base class and interfaces for hidden Markov model learning algorithms;
  - Adding a class for the Univariate F-Distribution;
  - Adding a class for Independent Component Analysis (ICA);
  - Adding a Whitening Transform method in Statistics.Tools;
  - Adding Sparse versions of Gaussian, Polynomial, Laplacian, Sigmoid
    and Cauchy kernels to operate on sparse vectors directly;
  - Adding options for Principal Component Analysis and Kernel Principal
    Component Analysis to be computed in place, conserving memory;
  - Updating Projection filter to use a Collection instead of List<T> (CA1002);
  - Updating Histogram and HistogramView to work with empty sample vectors;
  - Updating Principal Component Analysis and Partial Least Squares Analysis
    to raise exception if std deviation is zero, instead of failing silently;
  - Updating Evaluate method in Hidden Markov models to compute forward
    probabilities instead of the probability of the most likely (Viterbi) path;
  - Fixing an issue with Mixture model fitting when one of the weights is zero.
  

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.1.5. May work with newer versions.




Accord.NET Framework 2.1.4 release notes
-----------------------------------------
01.12.2010.    

Version updates and fixes:
 
* Accord.Core
  - Adding a new assembly, Accord.Core, to accommodate common
    framework classes such as specialized exceptions;

* Accord.Math
  - Adding some Tools.Scale overloads to operate on matrices and arrays;
  - Adding an option to compute LU decomposition and transpose in place;
  - Cleaning Matrix to have only generic implementations for Max and Min;
  - Fixing a bug in Nonnegative Matrix Factorization in which certain
    input characteristics would raise an IndexOutOfRange exception.

* Accord.MachineLearning
  - Adding a SparseSampleReader class to read from files containing
    sparse data samples represented in libsvm's sparse vector format;
  - Changing MulticlassSupportVectorMachine to implement the interface
    ISupportVectorMachine.Compute explicitly, so the method can also
    return a more intuitive integer class label rather than a double.
  
* Accord.Neuro
  - Adding several optimizations to Levenberg-Marquardt learning.

* Accord.Statistics
  - Adding a Custom (lambda) kernel for ad-hoc kernels;
  - Adding a Precomputed kernel for manually specifying a kernel Matrix;
  - Adding a Sparse Linear Kernel to operate on sparse vectors directly;
  - Adding support for different weights in the Additive combination kernel;
  - Adding support for setting the Gamma parameter in the Gaussian kernel;
  - Moving nested classes in StepwiseLogisticRegression to separate locations;
  - Correcting error calculation in Multiple Linear Regression.

* Accord.Imaging
  - Adding a ToBitmap overload to convert from byte matrices;
  - Adding a new overload to the Scale method to accept floats;
  - Adding a new overload to ImageBox to support background color;
  - Correcting Harris Corners Detector (with support for Nobel's corner measure);
  - Correcting Blend filter to ignore fully transparent pixels;
  - Modifying Blend filter to use float instead of doubles.

* Accord.Vision
  - Adding different scaling modes to Haar Cascade Object Detector;
  - Adding initial support for Tilted features in HaarCascadeClassifier and
    Tilted Integral Image calculation in IntegralImage2 class;
  - Rewrite of the Haar Cascade Classifier to work with all compatible XML
    definitions. Serialization is now performed using standard .NET serializers.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.1.4. May work with newer versions.




Accord.NET Framework 2.1.3 release notes
-----------------------------------------
01.11.2010.    

Version updates and fixes:
 
* General
  - Heavy work on documentation;
  - Adding parameter verification in several methods;

* Accord.Math
  - Adding Non-Negative Matrix Factorization;
  - Adding a new Split method to split vectors in Matrix class;
  - Adding a new IsPositiveDefinite method in Matrix class;
  - Adding a new method for equation solving in LU and QR
    decompositions to help in multiplication by inverse;
  - Adding a new overload to the Solve method in Cholesky
    decomposition to solve for vectors;
  - Updating Matrix.Divide to use the LU and QR decompositions;
  - Correcting a bug in the Submatrix method for vectors;
  - Reworking some of the matrix formatting architecture.

* Accord.MachineLearning
  - Adding Gaussian Mixture Models;
  - Adding configurable distance metric and adjustable/relative
    convergence threshold to K-Means clustering;
  - Updating the interface of Crossvalidation and Multiclass Support
    Vector Machines to use delegates instead of raw lambda functions.

* Accord.Statistics
  - Major reorganization of the Statistics.Markov namespace;
  - Major reorganization of the Statistics.Distributions namespace;
  - Adding Continuous Hidden Markov Models and Sequence Classifier;
  - Adding support for univariate/multivariate Mixture distributions;
  - Adding Poisson, Multinomial and Bernoulli probability distributions; 
  - Adding overloads to Statistics.Tools for weighted measures;
  - Correcting an infinite loop issue in hidden Markov models learning;
  - Fixing Wavelet kernel - translation parameter was being ignored.

* Accord.Imaging
  - Adding ToBitmap/ToDoubleArray extension methods for color images;
  - Correcting a bug in distance function in RansacHomograpyEstimation.

* Accord.Vision
  - Adding HaarCascadeClassifier as a parameter to HaarObjectDetector;
  - Changing DefaultFaceDetector to be a property rather than a method.

* Accord.Controls
  - Adding a RangeTypeConverter to show AForge.IntRange and DoubleRanges
    properly in controls such as the PropertyGrid.

* Samples 
  - Added Continuous density Hidden Markov Models sample application;
  - Added Gaussian Mixture Models sample application;
  - Added K-Means color clustering sample application.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.1.4. May work with newer versions.




Accord.NET Framework 2.1.2 release notes
-----------------------------------------
01.10.2010.    

Version updates and fixes:
 
* Accord.Math
  - Adding formatting and parsing extension methods for matrices;
  - Fixing an infinite-loop condition in SVD, also updating the
    inverse and solve methods to use optimized matrix multiplication;

* Accord.MachineLearning
  - Adding initial version of the K-Means clustering algorithm;

* Accord.Statistics
  - Adding a missing overload of the Variance method;
  - Adding a minimum variance threshold for components in KPCA;
  - Fixing an issue with the Result property of PCA, KPCA, LDA and KDA;

* Accord.Imaging
  - Adding ToBitmap extension methods;
  - Performance improvements in the Harris Corners Detector;
  - Fixing interface compatibility with the latest version of AForge.
    Minimum required version of AForge.NET is now version 2.1.4.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.1.4. May work with newer versions.




Accord.NET Framework 2.1.1 release notes
-----------------------------------------
01.09.2010.    

Version updates and fixes:

* General
  - Most model classes are now serializable;
  - Adding a new icon for the framework;
  - Adding a great number of unit tests;
  - Several improvements in documentation;

* Accord.Vision
  - Fixing some issues with Camshift in HSL mode;
  - Adding a Camshift mixed mode to work on a HSL space
    with some lightness/saturation information;

* Accord.Math
  - Added optimizations to some matrix operations;
  - Added autocorrection for JAMA's SVD assumptions;
  - Added more tests for the matrix decompositions;

* Accord.MachineLearning
  - Corrected the casing of the name of GridSearch related classes;

* Accord.Statistics
  - Several corrections to basic statistics tools;
  - Added Wavelet and Dynamic Time Warp kernels;

* Accord.Imaging
  - Added support for 32bpp images in the blending
    filter, also fixed a issue with final image size;
  - Some fixes for the Correlation Matching class;

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.1.3. May work with other versions.




Accord.NET Framework 2.1.0 release notes
-----------------------------------------
01.08.2010.    

Version updates and fixes:

* General
  - Updated AForge version to v2.1.3
  - Updating some projects to target .NET 3.5
  - Added the Accord.Vision namespace

* Accord.Statistics
  - Correction of the ANOVA kernel;
  - Added minor optimizations to some radial basis function kernels;
  - Added option to force the inclusion of the origin point in ROC curves;

* Accord.Imaging
  - Fixed blending filter issue when second image was placed at left of the first image.
  - WaveletTransform now works properly on 16bpp Grayscale images for added precision;

* Accord.Vision
  - Added support for Camshift-based object tracking;
  - Added support for the Viola-Jones method for face detection;

* Accord.Math
  - Added more comments on the Singular Value Decomposition issues;
  - Added more extension methods to Accord.Math.Matrix, such as CartesianProduct;
  - Updated Factorial, Binomial and other special functions;

* Accord.MachineLearning
  - Added support for Multiclass (Kernel) Support Vector Machines;
  - Added a Grid Search class for parameter tuning;
  - Added a Crossvalidation class for model measurement;
  - Sequential Minimal Optimization now works with common (linear) machines;

* Samples 
  - Adjusting Panorama sample application;
  - Removed incomplete SignalSplitter sample;
  - Added Multiclass Support Vector Machine-based Handwriting Recognition sample application;
  - Added sample applications for face tracking and detection
  - Added a sample application to demonstrate some matrix operations.

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.1.3. May work with other versions.




Accord.NET Framework 2.0.2 release notes
-----------------------------------------
01.07.2010.            

Version updates and fixes:

* General
  - Some refactoring to comply with more Code Analysis rules

* Accord.Statistics
  - Added common base class for DataTable Filters
  - Added computation of Variable Importance in Projection (VIP) for PLS
  - Changed Kernel Discriminant Analysis to use a Generalized Eigenvalue
    Decomposition for increased efficiency.

* Accord.Imaging
  - Added Wavelet transform filter
  - Improvements to the Blending filter
  - Adding sample pictures for the Panorama sample application
  - Added MatrixH to represent general transformation matrices more efficiently
  - Simplification of RansacHomographyEstimator using PointF instead of PointH

* Accord.MachineLearning
  - Adding initial Crossvalidation class for general models
  - Simplifying RANSAC to be independent of the model data type

* Accord.Wavelets
  - Updating the Wavelet libraries and adding a sample application

* Accord.Math
  - Added special functions Log1p and Expm1 to Accord.Math.Special
  - Added support for computing Generalized Eigenvalue Decompositions

* AForge Compatibility
  - Compiled against AForge.NET Framework 2.1.2. May work with other versions.




Accord.NET Framework 2.0.1 release notes
-----------------------------------------
01.06.2010.            

Version updates and fixes:

* General
  - Added support for Sandcastle generated documentation
  - Added unit testing for Imaging, MachineLearning, Math, Neuro, Statistics and Wavelets namespaces
  - Updated assemblies information

* Accord.Statistics
  - Fixed an issue with Kernel Principal Component Analysis reversion

* Accord.Wavelets
  - Added Haar and CDF97 1D and 2D Wavelet Transforms




Accord.NET Framework 2.0.0 release notes
-----------------------------------------
20.05.2010.

Initial release.

* Accord.Math
  - MATLAB-like matrix manipulation of multidimensional-arrays
  - Hilbert transform
  - Numeric decompositions (SVD, Eigen, Cholesky, LU, QR)
  - Special scientific functions;

* Accord.Statistics
  - Simple Descriptive Analysis
  - Linear Discriminant Analysis (LDA)
  - Kernel Discriminant Analysis (KDA)
  - Principal Component Analysis (PCA)
  - Kernel Principal Component Analysis (KPCA)
  - Partial Least Squares Analysis (PLS)
  - Logistic Regression Fitting and Analysis
  - Multivariate, Multiple and Simple Linear Regressions
  - Receiver Operating Curves (ROC)
  - Chi-Square and Wald Hypothesis Tests
  - Wide variety of Kernels for machine learning
  - Hidden Markov Models (HMM) and Sequence Classifiers
  - Filters for preprocessing of DataTables such as
    discretization, normalization, categorization and equalization
  
* Accord.Neuro
  - Levenberg-Marquardt (with Bayesian Regularization) Learning Algorithm
  - Nguyen-Widrow Weight Initialization for Activation Networks
  
* Accord.MachineLearning
  - Support Vector Machines (SVM)
  - Kernel Support Vector Machines (kSVM)
  - Sequential Minimal Optimization Learning (SMO)
  - Sequential Minimal Optimization for Regression (SMOr)
  - Multipurpose RANSAC for robust model estimation

* Accord.Imaging
  - Harris Corner Detector for AForge.NET
  - Robust Homography estimation using RANSAC
  
* Accord.Audio
  - Experimental audio library for audio processing
  
* Accord.Audition
  - Experimental audio library for computer audition

  
* Samples
  - Sample applications for almost all features listed here.