Class SofomoreDataLogger

source code

                   object --+    
                            |    
cma.interfaces.BaseDataLogger --+
                                |
                               SofomoreDataLogger

data logger for class `CMAEvolutionStrategy`.

The logger is identified by its name prefix and (over-)writes or reads according data files. Therefore, the logger must be considered as *global* variable with unpredictable side effects, if two loggers with the same name and on the same working folder are used at the same time.

Examples

:

   import cma
   es = cma.CMAEvolutionStrategy(...)
   logger = cma.CMADataLogger().register(es)
   while not es.stop():
       ...
       logger.add()  # add can also take an argument

   logger.plot() # or a short cut can be used:
   cma.plot()  # plot data from logger with default name

   logger2 = cma.CMADataLogger('just_another_filename_prefix').load()
   logger2.plot()
   logger2.disp()

   import cma
   from matplotlib.pylab import *
   res = cma.fmin(cma.ff.sphere, rand(10), 1e-0)
   logger = res[-1]  # the CMADataLogger
   logger.load()  # by "default" data are on disk
   semilogy(logger.f[:,0], logger.f[:,5])  # plot f versus iteration, see file header
   cma.s.figshow()

Details

After loading data, the logger has the attributes `xmean`, `xrecent`, `std`, `f`, `D` and `corrspec` corresponding to ``xmean``, ``xrecentbest``, ``stddev``, ``fit``, ``axlen`` and ``axlencorr`` filename trails.

:See: `disp` (), `plot` ()