source: issm/trunk-jpl/src/m/classes/inversion.py@ 16307

Last change on this file since 16307 was 16307, checked in by Mathieu Morlighem, 11 years ago

CHG: md.inversion.cost_functions is now only one line (i.e., we cannot change the cost function during the optimization)
File size: 9.8 KB
Line 
1import numpy
2import copy
3from fielddisplay import fielddisplay
4from EnumDefinitions import *
5from StringToEnum import StringToEnum
6from checkfield import *
7from WriteData import *
8
9class inversion(object):
10 """
11 INVERSION class definition
12
13 Usage:
14 inversion=inversion();
15 """
16
17 def __init__(self): # {{{
18 self.iscontrol = 0
19 self.tao = 0
20 self.incomplete_adjoint = 0
21 self.control_parameters = float('NaN')
22 self.nsteps = 0
23 self.maxiter_per_step = float('NaN')
24 self.cost_functions = float('NaN')
25 self.cost_functions_coefficients = float('NaN')
26 self.gradient_scaling = float('NaN')
27 self.cost_function_threshold = 0
28 self.min_parameters = float('NaN')
29 self.max_parameters = float('NaN')
30 self.step_threshold = float('NaN')
31 self.vx_obs = float('NaN')
32 self.vy_obs = float('NaN')
33 self.vz_obs = float('NaN')
34 self.vel_obs = float('NaN')
35 self.thickness_obs = float('NaN')
36
37 #set defaults
38 self.setdefaultparameters()
39
40 #}}}
41 def __repr__(self): # {{{
42 string=' inversion parameters:'
43 string="%s\n%s"%(string,fielddisplay(self,'iscontrol','is inversion activated?'))
44 string="%s\n%s"%(string,fielddisplay(self,'incomplete_adjoint','1: linear viscosity, 0: non-linear viscosity'))
45 string="%s\n%s"%(string,fielddisplay(self,'control_parameters','ex: {''FrictionCoefficient''}, or {''MaterialsRheologyBbar''}'))
46 string="%s\n%s"%(string,fielddisplay(self,'nsteps','number of optimization searches'))
47 string="%s\n%s"%(string,fielddisplay(self,'cost_functions','indicate the type of response for each optimization step'))
48 string="%s\n%s"%(string,fielddisplay(self,'cost_functions_coefficients','cost_functions_coefficients applied to the misfit of each vertex and for each control_parameter'))
49 string="%s\n%s"%(string,fielddisplay(self,'cost_function_threshold','misfit convergence criterion. Default is 1%, NaN if not applied'))
50 string="%s\n%s"%(string,fielddisplay(self,'maxiter_per_step','maximum iterations during each optimization step'))
51 string="%s\n%s"%(string,fielddisplay(self,'gradient_scaling','scaling factor on gradient direction during optimization, for each optimization step'))
52 string="%s\n%s"%(string,fielddisplay(self,'step_threshold','decrease threshold for misfit, default is 30%'))
53 string="%s\n%s"%(string,fielddisplay(self,'min_parameters','absolute minimum acceptable value of the inversed parameter on each vertex'))
54 string="%s\n%s"%(string,fielddisplay(self,'max_parameters','absolute maximum acceptable value of the inversed parameter on each vertex'))
55 string="%s\n%s"%(string,fielddisplay(self,'vx_obs','observed velocity x component [m/yr]'))
56 string="%s\n%s"%(string,fielddisplay(self,'vy_obs','observed velocity y component [m/yr]'))
57 string="%s\n%s"%(string,fielddisplay(self,'vel_obs','observed velocity magnitude [m/yr]'))
58 string="%s\n%s"%(string,fielddisplay(self,'thickness_obs','observed thickness [m]'))
59 string="%s\n%s"%(string,'Available cost functions:')
60 string="%s\n%s"%(string,' 101: SurfaceAbsVelMisfit')
61 string="%s\n%s"%(string,' 102: SurfaceRelVelMisfit')
62 string="%s\n%s"%(string,' 103: SurfaceLogVelMisfit')
63 string="%s\n%s"%(string,' 104: SurfaceLogVxVyMisfit')
64 string="%s\n%s"%(string,' 105: SurfaceAverageVelMisfit')
65 string="%s\n%s"%(string,' 201: ThicknessAbsMisfit')
66 string="%s\n%s"%(string,' 501: DragCoefficientAbsGradient')
67 string="%s\n%s"%(string,' 502: RheologyBbarAbsGradient')
68 string="%s\n%s"%(string,' 503: ThicknessAbsGradient')
69 return string
70 #}}}
71 def setdefaultparameters(self): # {{{
72
73 #default is incomplete adjoint for now
74 self.incomplete_adjoint=1
75
76 #parameter to be inferred by control methods (only
77 #drag and B are supported yet)
78 self.control_parameters='FrictionCoefficient'
79
80 #number of steps in the control methods
81 self.nsteps=20
82
83 #maximum number of iteration in the optimization algorithm for
84 #each step
85 self.maxiter_per_step=20*numpy.ones(self.nsteps)
86
87 #the inversed parameter is updated as follows:
88 #new_par=old_par + gradient_scaling(n)*C*gradient with C in [0 1];
89 #usually the gradient_scaling must be of the order of magnitude of the
90 #inversed parameter (10^8 for B, 50 for drag) and can be decreased
91 #after the first iterations
92 self.gradient_scaling=50*numpy.ones((self.nsteps,1))
93
94 #several responses can be used:
95 self.cost_functions=101
96
97 #step_threshold is used to speed up control method. When
98 #misfit(1)/misfit(0) < self.step_threshold, we go directly to
99 #the next step
100 self.step_threshold=.7*numpy.ones(self.nsteps) #30 per cent decrement
101
102 #cost_function_threshold is a criteria to stop the control methods.
103 #if J[n]-J[n-1]/J[n] < criteria, the control run stops
104 #NaN if not applied
105 self.cost_function_threshold=float('NaN') #not activated
106
107 return self
108 #}}}
109 def checkconsistency(self,md,solution,analyses): # {{{
110
111 #Early return
112 if not self.iscontrol:
113 return md
114
115 num_controls=numpy.size(md.inversion.control_parameters)
116 num_costfunc=numpy.size(md.inversion.cost_functions)
117
118 md = checkfield(md,'inversion.iscontrol','values',[0,1])
119 md = checkfield(md,'inversion.tao','values',[0,1])
120 md = checkfield(md,'inversion.incomplete_adjoint','values',[0,1])
121 md = checkfield(md,'inversion.control_parameters','cell',1,'values',['BalancethicknessThickeningRate','FrictionCoefficient','MaterialsRheologyBbar','DamageDbar','Vx','Vy'])
122 md = checkfield(md,'inversion.nsteps','numel',[1],'>=',0)
123 md = checkfield(md,'inversion.maxiter_per_step','size',[md.inversion.nsteps],'>=',0)
124 md = checkfield(md,'inversion.step_threshold','size',[md.inversion.nsteps])
125 md = checkfield(md,'inversion.cost_functions','size',[num_costfunc],'values',[101,102,103,104,105,201,501,502,503,504,505])
126 md = checkfield(md,'inversion.cost_functions_coefficients','size',[md.mesh.numberofvertices,num_costfunc],'>=',0)
127 md = checkfield(md,'inversion.gradient_scaling','size',[md.inversion.nsteps,num_controls])
128 md = checkfield(md,'inversion.min_parameters','size',[md.mesh.numberofvertices,num_controls])
129 md = checkfield(md,'inversion.max_parameters','size',[md.mesh.numberofvertices,num_controls])
130
131 #Only SSA, HO and FS are supported right now
132 if solution==StressbalanceSolutionEnum():
133 if not (md.flowequation.isSSA or md.flowequation.isHO or md.flowequation.isFS):
134 md.checkmessage("'inversion can only be performed for SSA, HO or FS ice flow models");
135
136 if solution==BalancethicknessSolutionEnum():
137 md = checkfield(md,'inversion.thickness_obs','size',[md.mesh.numberofvertices],'NaN',1)
138 else:
139 md = checkfield(md,'inversion.vx_obs','size',[md.mesh.numberofvertices],'NaN',1)
140 md = checkfield(md,'inversion.vy_obs','size',[md.mesh.numberofvertices],'NaN',1)
141
142 return md
143 # }}}
144 def marshall(self,md,fid): # {{{
145
146 yts=365.0*24.0*3600.0
147
148 WriteData(fid,'object',self,'fieldname','iscontrol','format','Boolean')
149 WriteData(fid,'object',self,'fieldname','tao','format','Boolean')
150 WriteData(fid,'object',self,'fieldname','incomplete_adjoint','format','Boolean')
151 if not self.iscontrol:
152 return
153 WriteData(fid,'object',self,'fieldname','nsteps','format','Integer')
154 WriteData(fid,'object',self,'fieldname','maxiter_per_step','format','DoubleMat','mattype',3)
155 WriteData(fid,'object',self,'fieldname','cost_functions_coefficients','format','DoubleMat','mattype',1)
156 WriteData(fid,'object',self,'fieldname','gradient_scaling','format','DoubleMat','mattype',3)
157 WriteData(fid,'object',self,'fieldname','cost_function_threshold','format','Double')
158 WriteData(fid,'object',self,'fieldname','min_parameters','format','DoubleMat','mattype',3)
159 WriteData(fid,'object',self,'fieldname','max_parameters','format','DoubleMat','mattype',3)
160 WriteData(fid,'object',self,'fieldname','step_threshold','format','DoubleMat','mattype',3)
161 WriteData(fid,'object',self,'fieldname','vx_obs','format','DoubleMat','mattype',1,'scale',1./yts)
162 WriteData(fid,'object',self,'fieldname','vy_obs','format','DoubleMat','mattype',1,'scale',1./yts)
163 WriteData(fid,'object',self,'fieldname','vz_obs','format','DoubleMat','mattype',1,'scale',1./yts)
164 WriteData(fid,'object',self,'fieldname','thickness_obs','format','DoubleMat','mattype',1)
165
166 #process control parameters
167 num_control_parameters=len(self.control_parameters)
168 data=numpy.array([StringToEnum(control_parameter)[0] for control_parameter in self.control_parameters]).reshape(1,-1)
169 WriteData(fid,'data',data,'enum',InversionControlParametersEnum(),'format','DoubleMat','mattype',3)
170 WriteData(fid,'data',num_control_parameters,'enum',InversionNumControlParametersEnum(),'format','Integer')
171
172 #process cost functions
173 num_cost_functions=numpy.size(self.cost_functions)
174 data=copy.deepcopy(self.cost_functions)
175 data=[SurfaceAbsVelMisfitEnum() if x==101 else x for x in data]
176 data=[SurfaceRelVelMisfitEnum() if x==102 else x for x in data]
177 data=[SurfaceLogVelMisfitEnum() if x==103 else x for x in data]
178 data=[SurfaceLogVxVyMisfitEnum() if x==104 else x for x in data]
179 data=[SurfaceAverageVelMisfitEnum() if x==105 else x for x in data]
180 data=[ThicknessAbsMisfitEnum() if x==201 else x for x in data]
181 data=[DragCoefficientAbsGradientEnum() if x==501 else x for x in data]
182 data=[RheologyBbarAbsGradientEnum() if x==502 else x for x in data]
183 data=[ThicknessAbsGradientEnum() if x==503 else x for x in data]
184 data=[ThicknessAlongGradientEnum() if x==504 else x for x in data]
185 data=[ThicknessAcrossGradientEnum() if x==505 else x for x in data]
186 WriteData(fid,'data',numpy.array(data).reshape(1,-1),'enum',InversionCostFunctionsEnum(),'format','DoubleMat','mattype',3)
187 WriteData(fid,'data',num_cost_functions,'enum',InversionNumCostFunctionsEnum(),'format','Integer')
188 # }}}
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