/[escript]/trunk/escript/py_src/modelframe.py
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revision 614 by elspeth, Wed Mar 22 01:37:07 2006 UTC revision 874 by elspeth, Tue Oct 17 12:06:11 2006 UTC
# Line 1  Line 1 
1  # $Id$  # $Id$
2    
3    """
4    Environment for implementing models in escript
5    
6    @var __author__: name of author
7    @var __copyright__: copyrights
8    @var __license__: licence agreement
9    @var __url__: url entry point on documentation
10    @var __version__: version
11    @var __date__: date of the version
12    """
13    
14    __author__="Lutz Gross, l.gross@uq.edu.au"
15  __copyright__="""  Copyright (c) 2006 by ACcESS MNRF  __copyright__="""  Copyright (c) 2006 by ACcESS MNRF
16                      http://www.access.edu.au                      http://www.access.edu.au
17                  Primary Business: Queensland, Australia"""                  Primary Business: Queensland, Australia"""
18  __license__="""Licensed under the Open Software License version 3.0  __license__="""Licensed under the Open Software License version 3.0
19               http://www.opensource.org/licenses/osl-3.0.php"""               http://www.opensource.org/licenses/osl-3.0.php"""
20    __url__="http://www.iservo.edu.au/esys"
21    __version__="$Revision$"
22    __date__="$Date$"
23    
24    
25  from types import StringType,IntType,FloatType,BooleanType,ListType,DictType  from types import StringType,IntType,FloatType,BooleanType,ListType,DictType
26  from sys import stdout  from sys import stdout
27    import numarray
28    import operator
29  import itertools  import itertools
30  # import modellib  temporarily removed!!!  # import modellib  temporarily removed!!!
31    
# Line 348  class ParameterSet(LinkableObject): Line 366  class ParameterSet(LinkableObject):
366       - a ParameterSet object       - a ParameterSet object
367       - a Simulation object       - a Simulation object
368       - a Model object       - a Model object
369       - any other object (not considered by writeESySXML and writeXML)       - a numarray object
370             - a list of booleans
371            - any other object (not considered by writeESySXML and writeXML)
372            
373      Example how to create an ESySParameters object::      Example how to create an ESySParameters object::
374            
# Line 460  class ParameterSet(LinkableObject): Line 480  class ParameterSet(LinkableObject):
480    
481              val = document.createElement('Value')              val = document.createElement('Value')
482    
483              if isinstance(value,ParameterSet):              if isinstance(value,(ParameterSet,Link)):
484                  value.toDom(document, val)                  value.toDom(document, val)
485                  param.appendChild(val)                  param.appendChild(val)
486              elif isinstance(value, Link):              elif isinstance(value, numarray.NumArray):
487                  value.toDom(document, val)                  shape = value.getshape()
488                    if isinstance(shape, tuple):
489                        size = reduce(operator.mul, shape)
490                        shape = ' '.join(map(str, shape))
491                    else:
492                        size = shape
493                        shape = str(shape)
494    
495                    arraytype = value.type()
496                    numarrayElement = document.createElement('NumArray')
497                    numarrayElement.appendChild(dataNode(document, 'ArrayType', str(arraytype)))
498                    numarrayElement.appendChild(dataNode(document, 'Shape', shape))
499                    numarrayElement.appendChild(dataNode(document, 'Data', ' '.join(
500                        [str(x) for x in numarray.reshape(value, size)])))
501                    val.appendChild(numarrayElement)
502                  param.appendChild(val)                  param.appendChild(val)
503              elif isinstance(value,StringType):              elif isinstance (value, list):
504                  param.appendChild(dataNode(document, 'Value', value))                  param.appendChild(dataNode(document, 'Value', ' '.join(
505                        [str(x) for x in value])
506                    ))
507              else:              else:
508                  param.appendChild(dataNode(document, 'Value', str(value)))                  param.appendChild(dataNode(document, 'Value', str(value)))
509    
# Line 480  class ParameterSet(LinkableObject): Line 516  class ParameterSet(LinkableObject):
516              """              """
517              Remove the empty nodes from the children of this node.              Remove the empty nodes from the children of this node.
518              """              """
519              return [x for x in node.childNodes              ret = []
520                      if not isinstance(x, minidom.Text) or x.nodeValue.strip()]              for x in node.childNodes:
521                    if isinstance(x, minidom.Text):
522                        if x.nodeValue.strip():
523                            ret.append(x)
524                    else:
525                        ret.append(x)
526                return ret
527    
528          def _floatfromValue(doc):          def _floatfromValue(doc):
529              return float(doc.nodeValue.strip())              return float(doc.nodeValue.strip())
# Line 493  class ParameterSet(LinkableObject): Line 535  class ParameterSet(LinkableObject):
535              return int(doc.nodeValue.strip())              return int(doc.nodeValue.strip())
536    
537          def _boolfromValue(doc):          def _boolfromValue(doc):
538              return bool(doc.nodeValue.strip())              return _boolfromstring(doc.nodeValue.strip())
539    
540          def _nonefromValue(doc):          def _nonefromValue(doc):
541              return None              return None
542          
543            def _numarrayfromValue(doc):
544                for node in _children(doc):
545                    if node.tagName == 'ArrayType':
546                        arraytype = node.firstChild.nodeValue.strip()
547                    if node.tagName == 'Shape':
548                        shape = node.firstChild.nodeValue.strip()
549                        shape = [int(x) for x in shape.split()]
550                    if node.tagName == 'Data':
551                        data = node.firstChild.nodeValue.strip()
552                        data = [float(x) for x in data.split()]
553                return numarray.reshape(numarray.array(data, type=getattr(numarray, arraytype)),
554                                        shape)
555          
556            def _listfromValue(doc):
557                return [_boolfromstring(x) for x in doc.nodeValue.split()]
558    
559    
560            def _boolfromstring(s):
561                if s == 'True':
562                    return True
563                else:
564                    return False
565          # Mapping from text types in the xml to methods used to process trees of that type          # Mapping from text types in the xml to methods used to process trees of that type
566          ptypemap = {"Simulation": Simulation.fromDom,          ptypemap = {"Simulation": Simulation.fromDom,
567                      "Model":Model.fromDom,                      "Model":Model.fromDom,
# Line 507  class ParameterSet(LinkableObject): Line 571  class ParameterSet(LinkableObject):
571                      "int":_intfromValue,                      "int":_intfromValue,
572                      "str":_stringfromValue,                      "str":_stringfromValue,
573                      "bool":_boolfromValue,                      "bool":_boolfromValue,
574                      "NoneType":_nonefromValue                      "list":_listfromValue,
575                        "NumArray":_numarrayfromValue,
576                        "NoneType":_nonefromValue,
577                      }                      }
578    
579  #        print doc.toxml()  #        print doc.toxml()
# Line 524  class ParameterSet(LinkableObject): Line 590  class ParameterSet(LinkableObject):
590    
591                  if childnode.tagName == "Value":                  if childnode.tagName == "Value":
592                      nodes = _children(childnode)                      nodes = _children(childnode)
593                    #    if ptype == 'NumArray':
594                     #       pvalue = _numarrayfromValue(nodes)
595                     #   else:
596                      pvalue = ptypemap[ptype](nodes[0])                      pvalue = ptypemap[ptype](nodes[0])
597    
598              parameters[pname] = pvalue              parameters[pname] = pvalue
# Line 677  class Simulation(Model): Line 746  class Simulation(Model):
746            
747      FAILED_TIME_STEPS_MAX=20      FAILED_TIME_STEPS_MAX=20
748      MAX_ITER_STEPS=50      MAX_ITER_STEPS=50
749        MAX_CHANGE_OF_DT=2.
750            
751      def __init__(self, models=[], **kwargs):      def __init__(self, models=[], **kwargs):
752          """          """
# Line 718  class Simulation(Model): Line 788  class Simulation(Model):
788      Sets the i-th model.      Sets the i-th model.
789      """      """
790          if not isinstance(value,Model):          if not isinstance(value,Model):
791              raise ValueError("assigned value is not a Model, Model was:", i, " an instance of: ", value.__class__.__name__)              raise ValueError,"assigned value is not a Model but instance of %s"%(value.__class__.__name__,)
792          for j in range(max(i-len(self.__models)+1,0)):          for j in range(max(i-len(self.__models)+1,0)):
793              self.__models.append(None)              self.__models.append(None)
794          self.__models[i]=value          self.__models[i]=value
# Line 863  class Simulation(Model): Line 933  class Simulation(Model):
933          while not self.finalize():          while not self.finalize():
934              step_fail_counter=0              step_fail_counter=0
935              iteration_fail_counter=0              iteration_fail_counter=0
936              dt_new=self.getSafeTimeStepSize(dt)              if self.n==0:
937                    dt_new=self.getSafeTimeStepSize(dt)
938                else:
939                    dt_new=min(max(self.getSafeTimeStepSize(dt),dt/self.MAX_CHANGE_OF_DT),dt*self.MAX_CHANGE_OF_DT)
940              self.trace("%d. time step %e (step size %e.)" % (self.n+1,self.tn+dt_new,dt_new))              self.trace("%d. time step %e (step size %e.)" % (self.n+1,self.tn+dt_new,dt_new))
941              end_of_step=False              end_of_step=False
942              while not end_of_step:              while not end_of_step:
943                 end_of_step=True                 end_of_step=True
944                 if not dt_new>0:                 if not dt_new>0:
945                    raise NonPositiveStepSizeError("non-positive step size in step %d",self.n+1)                    raise NonPositiveStepSizeError("non-positive step size in step %d"%(self.n+1))
946                 try:                 try:
947                    self.doStepPreprocessing(dt_new)                    self.doStepPreprocessing(dt_new)
948                    self.doStep(dt_new)                    self.doStep(dt_new)
# Line 879  class Simulation(Model): Line 952  class Simulation(Model):
952                    end_of_step=False                    end_of_step=False
953                    iteration_fail_counter+=1                    iteration_fail_counter+=1
954                    if iteration_fail_counter>self.FAILED_TIME_STEPS_MAX:                    if iteration_fail_counter>self.FAILED_TIME_STEPS_MAX:
955                             raise SimulationBreakDownError("reduction of time step to achieve convergence failed.")                             raise SimulationBreakDownError("reduction of time step to achieve convergence failed after %s steps."%self.FAILED_TIME_STEPS_MAX)
956                    self.trace("iteration fails. time step is repeated with new step size.")                    self.trace("Iteration failed. Time step is repeated with new step size %s."%dt_new)
957                 except FailedTimeStepError:                 except FailedTimeStepError:
958                    dt_new=self.getSafeTimeStepSize(dt)                    dt_new=self.getSafeTimeStepSize(dt)
959                    end_of_step=False                    end_of_step=False
960                    step_fail_counter+=1                    step_fail_counter+=1
961                    self.trace("time step is repeated.")                    self.trace("Time step is repeated with new time step size %s."%dt_new)
962                    if step_fail_counter>self.FAILED_TIME_STEPS_MAX:                    if step_fail_counter>self.FAILED_TIME_STEPS_MAX:
963                          raise SimulationBreakDownError("time integration is given up after %d attempts."%step_fail_counter)                          raise SimulationBreakDownError("Time integration is given up after %d attempts."%step_fail_counter)
964              dt=dt_new              dt=dt_new
965              if not check_point==None:              if not check_point==None:
966                  if n%check_point==0:                  if n%check_point==0:

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