stream 2.0-0 (09/01/22)

New Features

• We now support %>% and defining pipelines with the new class DST_Runner.
• New base class DSF for data stream filters with implementations for DSF_Downsample, DSF_Convolve, DSF_Func, DSF_dplyr
• New DST_Multi to run multiple tasks on a stream.
• New DSD_NULL
• New DSOutlier: DSOutlier_DBSTREAM, DSOutlier_DStream
• DSD_ReadCSV gained parameter col.names
• Added DSD_ReadStream as an alias for DSD_ReadCSV.
• Added DST_WriteStream to write streams using update().
• Added DSD_Mixture to combine streams.
• update() now returns information like cluster assignments as a data.frame.
• DSC implementations now have a formula argument to decide what variables should be used for clustering.
• DSD_ReadDB has now close_stream().
• DSD_Memory, DSD_ReadDB and DSD_ReadStream have now a parameter called outofpoints to handle the situation that get_points requests more points than available.

Changes

• stream now implements a standard predict function (get_assignment() is now deprecated).
• class information and extra information is now stored as columns starting with ‘.’ instead of as attributes. See get_points().
• DSD_ScaleStream is now DSF_Scale and DSD_ScaleStream is deprecated.
• DSO is now called DSAggregate.
• The NAMESPACE is now managed using roxygen.
• evaluate is now a generic.
• noise and outliers are now the same concept. DS_Gaussian can make sure that noise points are separated from clusters.
• evaluate() is now called evaluate_static() and evaluate_cluster is evaluate_stream(), both are now generics.
• plot for DSC now automatically finds micro and macro-clusters to plot.

stream 1.5-1 (05/09/22)

Changes

• Removed registry in favor of using R Studio auto-complete.
• Outlier detectors are now in class DSOutlier class.
• We use now roxygen2 for man pages.
• Abstract classes now have constructors.

Bug Fixes

• Fixed typo in BIRCH interface: treshold -> threshold (by dinarior)

stream 1.5-0 (09/07/21)

New Features

• DSC implementations are now registered using DSC_registry.

Bug Fixes

• Fixed get_assignment.DSC_TwoStage when new data is available (reported by ozlempoyraz).

stream 1.4-0 (12/01/20)

New Features

• Added additional features to the DSD_Gaussians, now capable of using Mahalanobis distance and generating outliers.
• Updated evaluation procedure, now capable of performing external indices calculation using callbacks
• Added support for single-pass clusterers and outlier detectors
• Added outlier correctness assessment indices

stream 1.3-2 (05/04/20)

Bug Fixes

• DBSTREAM: Fixed array index bug (reported by MatthiasCarnein)
• BIRCH: Fixed C++ this pointer problem.

stream 1.3-1 (06/07/19)

New Features

• Added DSC_evoStream and DSC_EA. Code by Matthias Carnein.

Changes

• Package animation is now only suggested since it requires package magick which may need the imagemagick++ libraries installed.

stream 1.3-0 (05/31/18)

New Features

• Added DSC_BIRCH. Code and Interface by Dennis Assenmacher and Matthias Carnein.
• Added DSC_BICO. Code by Hendrik Fichtenberger, Marc Gille, Melanie Schmidt, Chris Schwiegelshohn, Christian Sohler and Interface provided by Matthias Carnein and Dennis Assenmacher.
• animate_cluster: noise now accepts “class” or “exclude” (“ignore” is deprecated).

Bug Fixes

• DSD_ReadCSV: Fixed bug with streams that have no class/cluster label (reported by Matthias Carnein).

stream 1.2-4 (02/25/17)

Bug Fixes

• Use dbFetch in DSD_ReadDB (new version of RSQLite).
• Register native C routines.

stream 1.2-3 (08/07/16)

Bug Fixes

• fixed saveDSC for DBStream.
• fixed handling of data with d=1 (reported by Ilana Lichtenstein).
• plot now automatically determines if the data supports a class attribute.

stream 1.2-2 (10/28/15)

• evaluate now reports noise information.

stream 1.2-1 (09/08/15)

• fixed problem with failing test under Windows.

stream 1.2-0 (09/06/15)

• generic and methods for description() added to exact descriptions from DSD, DSC and DSO objects.
• write_stream() gained parameter append and now throws an error if it would overwrite a file.
• DSC objects can now be saved and loaded using saveDSC and readDSC.
• we use now DBSCAN from package dbscan.
• DSC_DBSTREAM gained parameter metric and now also supports Manhattan and Maximum norm.
• DSC_DBSTREAM gained parameter assignments and function get_cluster_assignments() to retrieve the MC assignment of the clustered data points.
• cleaned up interface for animate_cluster() and animate_data().
• DSD_ReadCSV was completely rewritten to be more reliable. Lost argument d which is now figured out automatically.
• write_stream has now an argument called header (former name was col.names) to be consistent with DSD_ReadCSV.

stream 1.1-5 (07/02/15)

• NAMESPACE now imports non-standard packages correctly.
• DSC_DBSTREAM uses now Cm instead of noise.
• fixed iterator bug for DSC_DBSTREAM.
• evaluate gains argument noise to control if noise is ignored

stream 1.1-4 (05/24/15)

• evaluate checks if DSD has cluster labels for external evaluation measures.
• DSD_mlbenchmarkGenerator now shuffles data points.
• DSC_ReadCSV gains arguments skip and header.
• DSC_DStream: was reimplemented in C++ (Rcpp), number of grids N can now be fixed by the user.
• DSC_tNN was renamed DSC_DBSTREAM. Uses now SOM-style micro-cluster update and was reimplemented in C++ (Rcpp).

stream 1.1-1 (01/15/15)

• DSC_DStream: fixed bug with removing too many sporadic grids
• DSD_ReadCSV now uses readLine so it can read properly from URLs
• updated vignette

stream 1.1-0 (12/18/14)

• update now directly dispatches
• DSC_Memory replaces DSD_Wrapper
• DSD_ReadCSV replaces DSD_ReadStream. Improved handling of blocking and end of stream.
• added DSD_ReadDB (DBI interface)
• get_points can now produce cluster and class information

stream 1.0-3 (07/14/14)

• Fixed precision and recall calculation
• Added DSC_TwoStage

stream 1.0-2 (06/16/14)

• Warning for reclusterers removed.
• plot can now show micro-cluster assignment areas using assignment=TRUE

stream 1.0-1 (06/12/14)

• Improved documentation
• Improved DSD_MG
• plot gained a dim argument to plot only selected dimensions
• get_assignment gained a threshold argument
• DSC_Window added
• DSC_Sample gained a biased argument for biased sampling
• DSC_Wrapper can now wrap matrix-like objects (e.g., from package ff and bigmemory)

stream 1.0-0 (5/24/14)

• added D-Stream (with attraction)
• improved support for creating animations
• tnn: new decay models, tNN without shared density now reclusters using density reachability
• plot gained the type “both” that plots micro and macro-clusters
• DSC_Hierarchical and DSC_Kmeans gained min_weight to filter low weight micro-clusters before reclustering
• removed default radius, etc. for most clustering algorithms
• Added DSD_MG for simulating streams with concept drift
• moved MOA related code to streamMOA
• suspended DSC_BIRCH because of memory issues
• reset_stream gained a pos argument

stream 0.2-0 (2/21/14)

• major restructuring

stream 0.1-1 (8/16/13)

• initial version