source: trunk/Cbc/README

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Adding download links to bintray

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[2178]1# CBC Version 2.9.4 README
[353]2
[1690]3Welcome to the README for the COIN Branch and Cut Solver (CBC). CBC is
4distributed under the Eclipse Public License and is freely redistributable.
5All source code and documentation is Copyright IBM and others. This README may
6be redistributed freely.
[2]7
[2292]8## DOWNLOAD
9
10Binaries for most platforms are available for download from [Bintray](https://bintray.com/coin-or/download/Cbc)
11
[2139]12## DOCUMENTATION
[2]13
[2139]14For a quick start guide, please see the INSTALL file in this distribution. A
15(somehwat outdated) user's manual is available here:
[2]16
[1690]17http://www.coin-or.org/Cbc
[237]18
[1690]19More up-to-date automatically generated documentation of the source code can
20be found here:
[237]21
[1690]22http://www.coin-or.org/Doxygen/Cbc/
[237]23
[1690]24Further information can be found here:
[237]25
[1690]26http://projects.coin-or.org/Cbc
[237]27
[2139]28## SUPPORT
[237]29
[2139]30### List Serve
[1939]31
[2139]32CBC users should use the Cbc mailing list. To subscribe, go to
33http://list.coin-or.org/mailman/listinfo/cbc
[1939]34
[2139]35### Bug Reports
[1925]36
[2139]37Bug reports should be reported on the CBC development web site at
[1925]38
[2139]39https://projects.coin-or.org/Cbc/newticket
[1928]40
[2139]41## CHANGELOG
[1925]42
[2273]43 * Release 2.9.8
[2222]44
[2273]45   * Update to most current releases of dependencies
[2222]46   * Small bug fixes
[2273]47   * Add support for automatic build and test with Travis and Appveyor
48
49* Release 2.9.7
50
51   * Small bug fixes
[2222]52   * Option to switch to line buffered output
53
[2218]54 * Release 2.9.6
55
56   * Small bug fixes
57
58 * Release 2.9.5
59
60   * Small bug fixes
61
[2178]62 * Release 2.9.4
63
64   * Small fixes for stability
65   * Fixes for Doygen documentation generation
66
[2157]67 * Release 2.9.3
[1925]68
[2157]69   * Minor bug fixes
70
71 * Release 2.9.2
72
[2141]73   * Fix for proper installation with ```DESTDIR```
[1792]74
[2157]75 * Release 2.9.1
[1792]76
[2139]77   * Fix for dependency linking
78   * Minor bug fixes
[1792]79
[2157]80 * Release 2.9.0
81
[2159]82   * Introduced specialized branching methods for dealing with "big Ms".
83   * Introduced new methods for dealing with symmetry (requires installation of [nauty](http://pallini.di.uniroma1.it/))
84   * Introduction of conflict cuts (off by default, turn on with `-constraint conflict`)
[1792]85
[2157]86 * Release 2.8.13
87
[2139]88   * Improved message handling
89   * Miscellaneous bug fixes.
[1803]90
[2157]91 * Release 2.8.12
[2139]92   * Update for dependencies.
[1848]93
[2139]94 * Release 5.8.11
[2157]95
[2139]96   * Major overhaul of C interface
97   * Fixes to SOS
98   * Miscellaneous bug fixes
[1884]99
[2157]100 * Release 2.8.10
101
[2139]102   * More changes related to thread safety.
103   * Fix bug in build system with Visual Studio compiler.
104   * Miscellaneous bug fixes.
[1884]105
[2157]106 * Release 2.8.9
107
[2139]108   * Attempt to make Cbc thread safe.
109   * Add parallel examples.
110   * Add CbcSolverUsefulInfo.
111   * Bug fixes.
[1884]112
[2157]113 * Release 2.8.8
[1884]114
[2139]115   * Added example to show how to use Cbc with installed libraries in MSVC++
116   * Fixed inconsistency in addition of libCbcSolver to dependencies in
117     {{{cbc_addlibs.txt}}}.
[1892]118
[2157]119 * Release 2.8.7
[2139]120
121   * Changed so that Doxygen builds LaTex
122   * Fixes for build system
123
[2157]124 * Release 2.8.6
[2139]125
126   * Added option to explicitly link dependencies to comply with packaging
127     requirements on Fedora and Debian, as well as allow building of MinGW
128     DLLs.
129
[2157]130 * Release 2.8.5
131
[2139]132   * Minor fixes to build system
133
[2157]134 * Release 2.8.4
[2139]135   * Small bug fixes
136   * Upgrades to build system
137
138 * Release 2.8.3:
139
140   * Fix for handling SOS.
141
142 * Release 2.8.2:
143
144   * Fixed recognition of Glpk source in main configure.
145   * Minor bug fixes in CoinUtils, Clp, and Cbc.
146
147 * Release 2.8.1:
148
149   * Minor bug fixes
150
151 * Release 2.8.0:
152
153   * Introduced new secondaryStatus 8 to indicate that solving stopped due to
154     an iteration limit.
155   * Solution pool is now accessible via the command line and the CbcMain*
156     interface.
157   * New mipstart option to read an initial feasible solution from a file.
158     Only values for discrete variables need to be provided.
159
160   * Added Proximity Search heuristic by Fischetti and Monaci (off by
161     default): The simplest way to switch it on using stand-alone version is
162     ```-proximity on```.
163
164     Proximity Search is the new "No-Neighborhood Search" 0-1 MIP refinement
165     heuristic recently proposed by Fischetti and Monaci (2012). The idea is
166     to define a sub-MIP without additional constraints but with a modified
167     objective function intended to attract the search in the proximity of the
168     incumbent. The approach works well for 0-1 MIPs whose solution landscape
169     is not too irregular (meaning the there is reasonable probability of
170     finding an improved solution by flipping a small number of binary
171     variables), in particular when it is applied to the first heuristic
172     solutions found at the root node.
[1884]173   
[2139]174   * An implementation of Zero-Half-Cuts by Alberto Caprara is now available.
175     By default, these cuts are off. To use add to your command line
176     -zerohalfCuts root (or other options) or just -zero. So far, they may
177     help only on a small subset of problems and may need some tuning.
[1848]178
[2139]179     The implementation of these cuts is described in G. Andreello, A.
180     Caprara, and M. Fischetti "Embedding Cuts in a Branch and Cut Framework:
181     a Computational Study with {0,1/2}-Cuts" INFORMS Journal on Computing
182     19(2), 229-238, 2007 http://dx.doi.org/10.1287/ijoc.1050.0162
[1850]183
[2139]184   * An alternative implementation of a reduce and split cut generator by
185     Giacomo Nannicini is now available. By default, these cuts are off. To
186     use add to your command line -reduce2AndSplitCuts root (or other
187     options).
[1853]188
[2139]189     The implementation of these cuts is described in G. Cornuejols and G.
190     Nannicini "Practical strategies for generating rank-1 split cuts in
191     mixed-integer linear programming" Mathematical Programming Computation
192     3(4), 281-318, 2011 http://dx.doi.org/10.1007/s12532-011-0028-6
[1792]193
[2139]194   * An alternative robust implementation of a Gomory cut generator by Giacomo
195     Nannicini is now available. By default, these cuts are off. To use add to
196     your command line -GMI root (or other options).
[1792]197
[2139]198     The implementation of these cuts is described in G. Cornuejols, F.
199     Margot, and G. Nannicini "On the safety of Gomory cut generators"
200     http://faculty.sutd.edu.sg/~nannicini/index.php?page=publications
[1803]201
[2139]202   * To encourage the use of some of the more exotic/expensive cut generators
203     a parameter -slowcutpasses has been added. The idea is that the code does
204     these cuts just a few times - less than the more usual cuts. The default
205     is 10. The cut generators identified by "may be slow" at present are just
206     Lift and project and ReduceAndSplit (both versions).
207   
208   * Allow initialization of random seed by user. Pseudo-random numbers are
209     used in Cbc and Clp. In Clp they are used to break ties in degenerate
210     problems, while in Cbc heuristics such as the Feasibility Pump use them
211     to decide whether to round up or down. So if a different pseudo-random
212     seed is given to Clp then you may get a different continuous optimum and
213     so different cuts and heuristic solutions. This can be switched on by
214     setting randomSeed for Clp and/or randomCbcSeed for Cbc. The special
215     value of 0 tells code to use time of day for initial seed.
216   
217   * Building on this idea, Andrea Lodi, Matteo Fischetti, Michele Monaci,
218     Domenico Salvagnin, Yuji Shinano, and Andrea Tramontani suggest that this
219     idea be improved by running at the root node with multiple copies of
220     solver, each with its own different seed and then passing in the
221     solutions and cuts so that the main solver has a richer set of solutions
222     and possibly stronger cuts. This is switched on by setting
223     -multipleRootPasses. These can also be done in parallel.
224 
225   * Few changes to presolve for special variables and badly scaled problems
226     (in CoinUtils).
[1803]227
[2139]228   * New option -extraVariables <number> which switches on a trivial
229    re-formulation that introduces extra integer variables to group together
230    variables with same cost.
[1785]231
[2139]232   * For some problems, cut generators and general branching work better if
233     the problem would be infeasible if the cost is too high. If the new
234     option -constraintFromCutoff is set, the objective function is added as a
235     constraint which rhs is set to the current cutoff value (objective value
236     of best known solution).
[1785]237
[2139]238 * Release 2.7.8:
[1785]239
[2139]240   * Change message when LP simplex iteration limit is hit from "Exiting on
241     maximum nodes" to "Exiting on maximum number of iterations"
242   * Fix for using overlapping SOS.
243   * Fixes in buildsystem.
[1785]244
[2139]245 * Release 2.7.7:
[1785]246
[2139]247   * Fix to report interruption on user event if SIGINT is received by
248     CbcSolver. model->status() should now be 5 if this event happened. Added
249     method CbcModel::sayEventHappened() to make cbc stop due to an 'user
250     event'.
[1785]251
[2139]252   * Other minor fixes.
[1785]253
[2139]254 * Release 2.7.6:
[1785]255
[2139]256   * Fixes to build system.
[1785]257
[2139]258   * Other minor fixes.
[1785]259
[2139]260 * Release 2.7.5:
[1785]261
[2139]262   * Fixes to get AMPL interface working again.
[1785]263
[2139]264   * More fixes to MSVC++ files.
[1785]265
[2139]266 * Release 2.7.4:
[1785]267
[2139]268   * Minor bugfixes.
[1729]269
[2139]270 * Release 2.7.3:
[1729]271
[2139]272   * Minor bugfixes.
[1729]273
[2139]274   * Fixes to MSVC++ files.
[1729]275
[2139]276 * Release 2.7.2:
[1729]277
[2139]278   * Allow row/column names for GMPL models.
[1729]279
[2139]280   * Added CbcModel::haveMultiThreadSupport() to indicate whether Cbc library
281     has been compiled with multithread support.
[1729]282
[2139]283   * Added CbcModel::waitingForMiniBranchAndBound() to indicate whether
284     sub-MIP heuristic is currently running.
[1729]285
[2139]286   * Cbc shell should work with readline if configured with
287     ```--enable-gnu-packages```.
[1729]288
[2139]289   * Support for compressed input files (.gz, .bz2) is now enabled by default.
[1703]290
[2139]291   * Fix problems with relative gap tolerance > 100% and further bugs.
[1703]292
[2139]293   * Fixes for MSVC++ Version 9 files.
[2]294
[2139]295   * Minor fixes in buildsystem; update to BuildTools 0.7.1.
[2]296
[2139]297 * Release 2.7.1:
[2]298
[2139]299   * Fixes to MSVC++ files
[2]300
[2139]301 * Release 2.7.0:
[2]302
[2139]303   * License has been changed to the EPL.
[2]304
[2139]305   * Support for MSVC++ version 10 added.
[2]306
[2139]307   * Support for BuildTools version 0.7 to incorporate recent enhancements,
308     including proper library versioning in Linux, prohibiting installation of
309     private headers, etc.
[2]310
[2139]311   * Updated externals to new stable versions of dependent projects.
[2]312
[2139]313   * Improvements to heuristics.
[1703]314
[2139]315   * New options for cut generation.
[1703]316
[2139]317   * Improved reporting of results.
[1703]318
[2139]319   * Improvements to documentation.
[1703]320
[2139]321   * Minor bug fixes.
[1703]322
323
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