class ModelFitterCore(rpickle.RPickler):
def __init__(
self,
modelSpecification,
observedData,
parametersToFit=None,
selectedColumns=None,
fitterMethods=METHOD_FITTER_DEFAULTS,
numFitRepeat=1,
bootstrapMethods=METHOD_BOOTSTRAP_DEFAULTS,
parameterLowerBound=PARAMETER_LOWER_BOUND,
parameterUpperBound=PARAMETER_UPPER_BOUND,
parameterDct={},
fittedDataTransformDct={},
logger=Logger(),
isPlot=True,
_loggerPrefix="",
# The following must be kept in sync with ModelFitterBootstrap.bootstrap
numIteration: int = 10,
reportInterval: int = 1000,
synthesizerClass=ObservationSynthesizerRandomizedResiduals,
maxProcess: int = None,
serializePath: str = None,
):
"""
Constructs estimates of parameter values.
Parameters
----------
modelSpecification: ExtendedRoadRunner/str
roadrunner model or antimony model
observedData: NamedTimeseries/str
str: path to CSV file
parametersToFit: list-str/None
parameters in the model that you want to fit
if None, no parameters are fit
selectedColumns: list-str
species names you wish use to fit the model
default: all columns in observedData
parameterLowerBound: float
lower bound for the fitting parameters
parameterUpperBound: float
upper bound for the fitting parameters
parameterDct: dict
key: parameter name
value: triple - (lowerVange, startingValue, upperRange)
fittedDataTransformDct: dict
key: column in selectedColumns
value: function of the data in selectedColumns;
input: NamedTimeseries
output: array for the values of the column
logger: Logger
fitterMethods: str/list-str
method used for minimization in fitModel
numFitRepeat: int
number of times fitting is repeated for a method
bootstrapMethods: str/list-str
method used for minimization in bootstrap
numIteration: number of bootstrap iterations
reportInterval: number of iterations between progress reports
synthesizerClass: object that synthesizes new observations
Must subclass ObservationSynthesizer
maxProcess: Maximum number of processes to use. Default: numCPU
serializePath: Where to serialize the fitter after bootstrap
Usage
-----
parameterDct = {
"k1": (1, 5, 10), # name of parameter: low value, initial, high
"k2": (2, 3, 6)}
ftter = ModelFitter(roadrunnerModel, "observed.csv",
parameterDct=parameterDct)
fitter.fitModel() # Do the fit
fitter.bootstrap() # Estimate parameter variance with bootstrap
"""
if modelSpecification is not None:
# Not the default constructor
self._loggerPrefix = _loggerPrefix
self.modelSpecification = modelSpecification
self.parametersToFit = parametersToFit
self.lowerBound = parameterLowerBound
self.upperBound = parameterUpperBound
self.bootstrapKwargs = dict(
numIteration=numIteration,
reportInterval=reportInterval,
maxProcess=maxProcess,
serializePath=serializePath,
)
self.parameterDct = self._updateParameterDct(parameterDct)
self._numFitRepeat = numFitRepeat
if self.parametersToFit is None:
self.parametersToFit = [p for p in self.parameterDct.keys()]
self.observedTS = observedData
if self.observedTS is not None:
self.observedTS = mkNamedTimeseries(observedData)
#
self.fittedDataTransformDct = fittedDataTransformDct
#
if (selectedColumns is None) and (self.observedTS is not None):
selectedColumns = self.observedTS.colnames
self.selectedColumns = selectedColumns
# Construct array of non-nan observed values
self._observedArr = self.observedTS[self.selectedColumns].flatten()
# Other internal state
self._fitterMethods = fitterMethods
if isinstance(self._fitterMethods, str):
if self._fitterMethods == METHOD_BOTH:
self._fitterMethods = METHOD_FITTER_DEFAULTS
else:
self._fitterMethods = [self._fitterMethods]
self._bootstrapMethods = bootstrapMethods
if isinstance(self._bootstrapMethods, str):
self._bootstrapMethods = [self._bootstrapMethods]
self._isPlot = isPlot
self._plotter = tp.TimeseriesPlotter(isPlot=self._isPlot)
self._plotFittedTS = None # Timeseries that is plotted
self.logger = logger
# The following are calculated during fitting
self.roadrunnerModel = None
self.minimizer = None # lmfit.minimizer
self.minimizerResult = None # Results of minimization
self.params = None # params property in lmfit.minimizer
self.fittedTS = self.observedTS.copy(
isInitialize=True) # Initialize
self.residualsTS = None # Residuals for selectedColumns
self.bootstrapResult = None # Result from bootstrapping
# Validation checks
self._validateFittedDataTransformDct()
else:
pass
@classmethod
def rpConstruct(cls):
"""
Overrides rpickler.rpConstruct to create a method that
constructs an instance without arguments.
Returns
-------
Instance of cls
"""
return cls(None, None, None)
def rpRevise(self):
"""
Overrides rpickler.
"""
if not "logger" in self.__dict__.keys():
self.logger = Logger()
def _validateFittedDataTransformDct(self):
if self.fittedDataTransformDct is not None:
keySet = set(self.fittedDataTransformDct.keys())
selectedColumnsSet = self.selectedColumns
if (keySet is not None) and (selectedColumnsSet is not None):
excess = set(keySet).difference(selectedColumnsSet)
if len(excess) > 0:
msg = "Columns not in selectedColumns: %s" % str(excess)
raise ValueError(excess)
def _transformFittedTS(self, data):
"""
Updates the fittedTS taking into account required transformations.
Parameters
----------
data: np.ndarray
Results
----------
NamedTimeseries
"""
colnames = list(self.selectedColumns)
colnames.insert(0, TIME)
fittedTS = NamedTimeseries(array=data[:, :], colnames=colnames)
if self.fittedDataTransformDct is not None:
for column, func in self.fittedDataTransformDct.items():
if func is not None:
fittedTS[column] = func(fittedTS)
return fittedTS
def _updateParameterDct(self, parameterDct):
"""
Handles values that are tuples instead of ParameterSpecification.
"""
dct = dict(parameterDct)
for name, value in parameterDct.items():
if isinstance(value, tuple):
dct[name] = ParameterSpecification(lower=value[0],
upper=value[1],
value=value[2])
return dct
@staticmethod
def addParameter(parameterDct: dict, name: str, lower: float, upper: float,
value: float):
"""
Adds a parameter to a list of parameters.
Parameters
----------
parameterDct: parameter dictionary to agument
name: parameter name
lower: lower range of parameter value
upper: upper range of parameter value
value: initial value
Returns
-------
dict
"""
parameterDct[name] = ParameterSpecification(lower=lower,
upper=upper,
value=value)
def _adjustNames(self, antimonyModel:str, observedTS:NamedTimeseries) \
->typing.Tuple[NamedTimeseries, list]:
"""
Antimony exports can change the names of floating species
by adding a "_" at the end. Check for this and adjust
the names in observedTS.
Return
------
NamedTimeseries: newObservedTS
list: newSelectedColumns
"""
rr = te.loada(antimonyModel)
dataNames = rr.simulate().colnames
names = ["[%s]" % n for n in observedTS.colnames]
missingNames = [n[1:-1] for n in set(names).difference(dataNames)]
newSelectedColumns = list(self.selectedColumns)
if len(missingNames) > 0:
newObservedTS = observedTS.copy()
self.logger.exception("Missing names in antimony export: %s" %
str(missingNames))
for name in observedTS.colnames:
missingName = "%s_" % name
if name in missingNames:
newObservedTS = newObservedTS.rename(name, missingName)
newSelectedColumns.remove(name)
newSelectedColumns.append(missingName)
else:
newObservedTS = observedTS
return newObservedTS, newSelectedColumns
def copy(self, isKeepLogger=False):
"""
Creates a copy of the model fitter.
Preserves the user-specified settings and the results
of bootstrapping.
"""
if not isinstance(self.modelSpecification, str):
try:
modelSpecification = self.modelSpecification.getAntimony()
except Exception as err:
self.logger.error(
"Problem wth conversion to Antimony. Details:", err)
raise ValueError("Cannot proceed.")
observedTS, selectedColumns = self._adjustNames(
modelSpecification, self.observedTS)
else:
modelSpecification = self.modelSpecification
observedTS = self.observedTS.copy()
selectedColumns = self.selectedColumns
#
if isKeepLogger:
logger = self.logger
elif self.logger is not None:
logger = self.logger.copy()
else:
logger = None
newModelFitter = self.__class__(
copy.deepcopy(modelSpecification),
observedTS,
copy.deepcopy(self.parametersToFit),
selectedColumns=selectedColumns,
fitterMethods=self._fitterMethods,
bootstrapMethods=self._bootstrapMethods,
parameterLowerBound=self.lowerBound,
parameterUpperBound=self.upperBound,
parameterDct=copy.deepcopy(self.parameterDct),
fittedDataTransformDct=copy.deepcopy(self.fittedDataTransformDct),
logger=logger,
isPlot=self._isPlot)
if self.bootstrapResult is not None:
newModelFitter.bootstrapResult = self.bootstrapResult.copy()
newModelFitter.params = newModelFitter.bootstrapResult.params
else:
newModelFitter.bootstrapResult = None
newModelFitter.params = self.params
return newModelFitter
def _initializeRoadrunnerModel(self):
"""
Sets self.roadrunnerModel.
"""
if isinstance(self.modelSpecification,
te.roadrunner.extended_roadrunner.ExtendedRoadRunner):
self.roadrunnerModel = self.modelSpecification
elif isinstance(self.modelSpecification, str):
self.roadrunnerModel = te.loada(self.modelSpecification)
else:
msg = 'Invalid model.'
msg = msg + "\nA model must either be a Roadrunner model "
msg = msg + "an Antimony model."
raise ValueError(msg)
def getDefaultParameterValues(self):
"""
Obtain the original values of parameters.
Returns
-------
dict:
key: parameter name
value: value of parameter
"""
dct = {}
self._initializeRoadrunnerModel()
self.roadrunnerModel.reset()
for parameterName in self.parametersToFit:
dct[parameterName] = self.roadrunnerModel.model[parameterName]
return dct
def simulate(self,
params=None,
startTime=None,
endTime=None,
numPoint=None):
"""
Runs a simulation. Defaults to parameter values in the simulation.
Parameters
----------
params: lmfit.Parameters
startTime: float
endTime: float
numPoint: int
Return
------
NamedTimeseries
"""
def set(default, parameter):
# Sets to default if parameter unspecified
if parameter is None:
return default
else:
return parameter
##V
block = Logger.join(self._loggerPrefix, "fitModel.simulate")
guid = self.logger.startBlock(block)
## V
sub1Block = Logger.join(block, "sub1")
sub1Guid = self.logger.startBlock(sub1Block)
startTime = set(self.observedTS.start, startTime)
endTime = set(self.observedTS.end, endTime)
numPoint = set(len(self.observedTS), numPoint)
## V
sub1aBlock = Logger.join(sub1Block, "sub1a")
sub1aGuid = self.logger.startBlock(sub1aBlock)
if self.roadrunnerModel is None:
self._initializeRoadrunnerModel()
self.roadrunnerModel.reset()
## ^
self.logger.endBlock(sub1aGuid)
## V
sub1bBlock = Logger.join(sub1Block, "sub1b")
sub1bGuid = self.logger.startBlock(sub1bBlock)
if params is not None:
# Parameters have been specified
self._setupModel(params)
## ^
self.logger.endBlock(sub1bGuid)
# Do the simulation
selectedColumns = list(self.selectedColumns)
if not TIME in selectedColumns:
selectedColumns.insert(0, TIME)
## ^
self.logger.endBlock(sub1Guid)
## V
roadrunnerBlock = Logger.join(block, "roadrunner")
roadrunnerGuid = self.logger.startBlock(roadrunnerBlock)
data = self.roadrunnerModel.simulate(startTime, endTime, numPoint,
selectedColumns)
self.logger.endBlock(roadrunnerGuid)
## ^
# Select the required columns
## V
sub2Block = Logger.join(block, "sub2")
sub2Guid = self.logger.startBlock(sub2Block)
fittedTS = NamedTimeseries(namedArray=data)
self.logger.endBlock(sub2Guid)
## ^
self.logger.endBlock(guid)
##^
return fittedTS
def updateFittedAndResiduals(self, **kwargs) -> np.ndarray:
"""
Updates values of self.fittedTS and self.residualsTS
based on self.params.
Parameters
----------
kwargs: dict
arguments for simulation
Instance Variables Updated
--------------------------
self.fittedTS
self.residualsTS
Returns
-------
1-d ndarray of residuals
"""
self.fittedTS = self.simulate(**kwargs) # Updates self.fittedTS
cols = self.selectedColumns
if self.residualsTS is None:
self.residualsTS = self.observedTS.subsetColumns(cols)
self.residualsTS[cols] = self.observedTS[cols] - self.fittedTS[cols]
for col in cols:
self.residualsTS[col] = np.nan_to_num(self.residualsTS[col])
def _residuals(self, params) -> np.ndarray:
"""
Compute the residuals between objective and experimental data
Handle nan values in observedTS. This internal-only method
is implemented to maximize efficieency.
Parameters
----------
kwargs: dict
arguments for simulation
Instance Variables Updated
--------------------------
self.residualsTS
Returns
-------
1-d ndarray of residuals
"""
block = Logger.join(self._loggerPrefix, "fitModel._residuals")
guid = self.logger.startBlock(block)
##V
self.roadrunnerModel.reset()
self._setupModel(params)
#
roadrunnerBlock = Logger.join(block, "roadrunner")
roadrunnerGuid = self.logger.startBlock(roadrunnerBlock)
## V
#
data = self.roadrunnerModel.simulate(self.observedTS.start,
self.observedTS.end,
len(self.observedTS),
self.selectedColumns)
## ^
self.logger.endBlock(roadrunnerGuid)
#
tailBlock = Logger.join(block, "tail")
tailGuid = self.logger.startBlock(tailBlock)
## V
residualsArr = self._observedArr - data.flatten()
residualsArr = np.nan_to_num(residualsArr)
## ^
self.logger.endBlock(tailGuid)
##^
self.logger.endBlock(guid)
#
# Used for detailed debugging
if False:
self.logger.details("_residuals/std(residuals): %f" %
np.std(residualsArr))
self.logger.details("_residuals/params: %s" % str(params))
return residualsArr
def fitModel(self, params: lmfit.Parameters = None, max_nfev: int = 100):
"""
Fits the model by adjusting values of parameters based on
differences between simulated and provided values of
floating species.
Parameters
----------
params: starting values of parameters
max_nfev: maximum number of function evaluations
Example
-------
f.fitModel()
"""
ParameterDescriptor = collections.namedtuple(
"ParameterDescriptor",
"params method std minimizer minimizerResult")
block = Logger.join(self._loggerPrefix, "fitModel")
guid = self.logger.startBlock(block)
self._initializeRoadrunnerModel()
if self.parametersToFit is None:
# Compute fit and residuals for base model
self.params = None
else:
if params is None:
params = self.mkParams()
# Fit the model to the data using one or more methods.
# Choose the result with the lowest residual standard deviation
paramDct = {}
for method in self._fitterMethods:
for _ in range(self._numFitRepeat):
minimizer = lmfit.Minimizer(self._residuals,
params,
max_nfev=max_nfev)
try:
minimizerResult = minimizer.minimize(method=method,
max_nfev=max_nfev)
except Exception as excp:
msg = "Error minimizing for method: %s" % method
self.logger.error(msg, excp)
continue
params = minimizerResult.params
std = np.std(self._residuals(params))
if method in paramDct.keys():
if std >= paramDct[method].std:
continue
paramDct[method] = ParameterDescriptor(
params=params.copy(),
method=method,
std=std,
minimizer=minimizer,
minimizerResult=minimizerResult,
)
if len(paramDct) == 0:
msg = "*** Minimizer failed for this model and data."
raise ValueError(msg)
# Select the result that has the smallest residuals
sortedMethods = sorted(paramDct.keys(),
key=lambda m: paramDct[m].std)
bestMethod = sortedMethods[0]
self.params = paramDct[bestMethod].params
self.minimizer = paramDct[bestMethod].minimizer
self.minimizerResult = paramDct[bestMethod].minimizerResult
# Ensure that residualsTS and fittedTS match the parameters
self.updateFittedAndResiduals(params=self.params)
self.logger.endBlock(guid)
def getFittedModel(self):
"""
Provides the roadrunner model with fitted parameters
Returns
-------
ExtendedRoadrunner
"""
self._checkFit()
self.roadrunnerModel.reset()
self._setupModel(self.params)
return self.roadrunnerModel
def _setupModel(self, params):
"""
Sets up the model for use based on the parameter parameters
Parameters
----------
params: lmfit.Parameters
"""
pp = params.valuesdict()
for parameter in self.parametersToFit:
try:
self.roadrunnerModel.model[parameter] = pp[parameter]
except Exception as err:
msg = "_modelFitterCore/_setupModel: Could not set value for %s" \
% parameter
self.logger.error(msg, err)
def mkParams(self, parameterDct: dict = None) -> lmfit.Parameters:
"""
Constructs lmfit parameters based on specifications.
Parameters
----------
parameterDct: key=name, value=ParameterSpecification
Returns
-------
lmfit.Parameters
"""
def get(value, base_value, multiplier):
if value is not None:
return value
return base_value * multiplier
#
if parameterDct is None:
parameterDct = self.parameterDct
params = lmfit.Parameters()
for parameterName in self.parametersToFit:
if parameterName in parameterDct.keys():
specification = parameterDct[parameterName]
value = get(specification.value, specification.value, 1.0)
if value > 0:
lower_factor = LOWER_PARAMETER_MULT
upper_factor = UPPER_PARAMETER_MULT
else:
upper_factor = UPPER_PARAMETER_MULT
lower_factor = LOWER_PARAMETER_MULT
lower = get(specification.lower, specification.value,
lower_factor)
upper = get(specification.upper, specification.value,
upper_factor)
if np.isclose(lower - upper, 0):
upper = 0.0001
try:
params.add(parameterName,
value=value,
min=lower,
max=upper)
except Exception as err:
msg = "modelFitterCore/mkParams parameterName %s" \
% parameterName
self.logger.error(msg, err)
else:
value = np.mean([self.lowerBound, self.upperBound])
params.add(parameterName,
value=value,
min=self.lowerBound,
max=self.upperBound)
return params
def _checkFit(self):
if self.params is None:
raise ValueError("Must use fitModel before using this method.")
def serialize(self, path):
"""
Serialize the model to a path.
Parameters
----------
path: str
File path
"""
newModelFitter = self.copy()
with open(path, "wb") as fd:
rpickle.dump(newModelFitter, fd)
@classmethod
def deserialize(cls, path):
"""
Deserialize the model from a path.
Parameters
----------
path: str
File path
Return
------
ModelFitter
Model is initialized.
"""
with open(path, "rb") as fd:
fitter = rpickle.load(fd)
fitter._initializeRoadrunnerModel()
return fitter
class TestLogger(unittest.TestCase):
def setUp(self):
self.remove()
self.logger = Logger(toFile=LOG_PATH,
logPerformance=True,
logLevel=logs.LEVEL_MAX)
def tearDown(self):
self.remove()
def remove(self):
for ffile in FILES:
if os.path.isfile(ffile):
os.remove(ffile)
def isFile(self):
return os.path.isfile(LOG_PATH)
def read(self):
if not self.isFile():
raise RuntimeError("Missing log file.")
with open(LOG_PATH, "r") as fd:
lines = fd.readlines()
return lines
def testConstructor(self):
if IGNORE_TEST:
return
self.assertFalse(self.isFile())
self.assertEqual(self.logger.logLevel, logs.LEVEL_MAX)
def testFileDescriptor(self):
if IGNORE_TEST:
return
fd = self.logger.getFileDescriptor()
self.assertIsInstance(fd, io.TextIOWrapper)
fd.close()
def _checkMsg(self, msg):
lines = self.read()
true = any([MSG in t for t in lines])
self.assertTrue(true)
return lines
def testWrite(self):
if IGNORE_TEST:
return
self.logger._write(MSG, 0)
_ = self._checkMsg(MSG)
def _testApi(self, method, logLevel):
if IGNORE_TEST:
return
logger = Logger(toFile=LOG_PATH, logLevel=logLevel)
stmt = "logger.%s(MSG)" % method
exec(stmt)
line1s = self._checkMsg(MSG)
#
logger = Logger(toFile=LOG_PATH, logLevel=0)
stmt = "logger.%s(MSG)" % method
exec(stmt)
line2s = self.read()
self.assertEqual(len(line1s), len(line2s))
def testActivity(self):
if IGNORE_TEST:
return
self._testApi("activity", logs.LEVEL_ACTIVITY)
def testResult(self):
if IGNORE_TEST:
return
self._testApi("result", logs.LEVEL_RESULT)
def testStatus(self):
if IGNORE_TEST:
return
self._testApi("status", logs.LEVEL_STATUS)
def testException(self):
if IGNORE_TEST:
return
self._testApi("status", logs.LEVEL_EXCEPTION)
def testStartBlock(self):
if IGNORE_TEST:
return
guid = self.logger.startBlock(BLOCK1)
self.assertLess(guid, BlockSpecification.guid)
self.assertEqual(len(self.logger.blockDct), 1)
def testEndBlock(self):
if IGNORE_TEST:
return
guid1 = self.logger.startBlock(BLOCK1)
guid2 = self.logger.startBlock(BLOCK2)
self.logger.endBlock(guid2)
self.logger.endBlock(guid1)
self.assertGreater(self.logger.statisticDct[BLOCK1].total,
self.logger.statisticDct[BLOCK2].total)
def testNoLogPerformance(self):
if IGNORE_TEST:
return
logger = Logger(toFile=LOG_PATH,
logPerformance=False,
logLevel=logs.LEVEL_MAX)
guid = logger.startBlock(BLOCK1)
self.assertEqual(len(self.logger.blockDct), 0)
logger.endBlock(guid)
self.assertEqual(len(self.logger.blockDct), 0)
def testPerformanceReport(self):
if IGNORE_TEST:
return
def test(numBlock, sleepTime):
logger = Logger(logPerformance=True)
for idx in range(numBlock):
block = "blk_%d" % idx
guid = logger.startBlock(block)
time.sleep(sleepTime)
logger.endBlock(guid)
df = logger.performanceDF
self.assertLess(np.abs(sleepTime - df["mean"].mean()), sleepTime)
self.assertEqual(df["count"].mean(), 1.0)
#
test(3, 0.1)
test(30, 0.1)
def testJoin(self):
if IGNORE_TEST:
return
NAMES = ["aa", "bbb", "z"]
result = Logger.join(*NAMES)
for name in NAMES:
self.assertGreaterEqual(result.index(name), 0)
def testCopy(self):
if IGNORE_TEST:
return
newLogger = self.logger.copy()
self.assertTrue(self.logger.equals(newLogger))
class ModelFitterCore(rpickle.RPickler):
# Subclasses used in interface
class OptimizerMethod():
def __init__(self, method, kwargs):
self.method = method
self.kwargs = kwargs
def __init__(
self,
modelSpecification,
observedData,
parametersToFit=None,
selectedColumns=None,
fitterMethods=None,
numFitRepeat=1,
bootstrapMethods=None,
parameterLowerBound=PARAMETER_LOWER_BOUND,
parameterUpperBound=PARAMETER_UPPER_BOUND,
parameterDct=None,
fittedDataTransformDct=None,
logger=Logger(),
isPlot=True,
_loggerPrefix="",
# The following must be kept in sync with ModelFitterBootstrap.bootstrap
numIteration: int = 10,
reportInterval: int = 1000,
maxProcess: int = None,
serializePath: str = None,
):
"""
Constructs estimates of parameter values.
Parameters
----------
modelSpecification: ExtendedRoadRunner/str
roadrunner model or antimony model
observedData: NamedTimeseries/str
str: path to CSV file
parametersToFit: list-str/None
parameters in the model that you want to fit
if None, no parameters are fit
selectedColumns: list-str
species names you wish use to fit the model
default: all columns in observedData
parameterLowerBound: float
lower bound for the fitting parameters
parameterUpperBound: float
upper bound for the fitting parameters
parameterDct: dict
key: parameter name
value: triple - (lowerVange, startingValue, upperRange)
fittedDataTransformDct: dict
key: column in selectedColumns
value: function of the data in selectedColumns;
input: NamedTimeseries
output: array for the values of the column
logger: Logger
fitterMethods: str/list-str/list-OptimizerMethod
method used for minimization in fitModel
numFitRepeat: int
number of times fitting is repeated for a method
bootstrapMethods: str/list-str/list-OptimizerMethod
method used for minimization in bootstrap
numIteration: number of bootstrap iterations
reportInterval: number of iterations between progress reports
maxProcess: Maximum number of processes to use. Default: numCPU
serializePath: Where to serialize the fitter after bootstrap
Usage
-----
parameterDct = {
"k1": (1, 5, 10), # name of parameter: low value, initial, high
"k2": (2, 3, 6)}
ftter = ModelFitter(roadrunnerModel, "observed.csv",
parameterDct=parameterDct)
fitter.fitModel() # Do the fit
fitter.bootstrap() # Estimate parameter variance with bootstrap
"""
if modelSpecification is not None:
# Not the default constructor
self._loggerPrefix = _loggerPrefix
self.modelSpecification = modelSpecification
self.parametersToFit = parametersToFit
self.lowerBound = parameterLowerBound
self.upperBound = parameterUpperBound
self.bootstrapKwargs = dict(
numIteration=numIteration,
reportInterval=reportInterval,
maxProcess=maxProcess,
serializePath=serializePath,
)
self.parameterDct = ModelFitterCore._updateParameterDct(
parameterDct)
self._numFitRepeat = numFitRepeat
if self.parametersToFit is None:
self.parametersToFit = list(self.parameterDct.keys())
self.observedTS = observedData
if self.observedTS is not None:
self.observedTS = mkNamedTimeseries(observedData)
#
self.fittedDataTransformDct = fittedDataTransformDct
#
if (selectedColumns is None) and (self.observedTS is not None):
selectedColumns = self.observedTS.colnames
self.selectedColumns = selectedColumns
if self.observedTS is not None:
self._observedArr = self.observedTS[
self.selectedColumns].flatten()
else:
self._observedArr = None
# Other internal state
self._fitterMethods = self._makeMethods(fitterMethods,
METHOD_FITTER_DEFAULTS)
self._bootstrapMethods = self._makeMethods(
bootstrapMethods, METHOD_BOOTSTRAP_DEFAULTS)
if isinstance(self._bootstrapMethods, str):
self._bootstrapMethods = [self._bootstrapMethods]
self._isPlot = isPlot
self._plotter = tp.TimeseriesPlotter(isPlot=self._isPlot)
self._plotFittedTS = None # Timeseries that is plotted
self.logger = logger
# The following are calculated during fitting
self.roadrunnerModel = None
self.minimizer = None # lmfit.minimizer
self.minimizerResult = None # Results of minimization
self.params = None # params property in lmfit.minimizer
self.fittedTS = self.observedTS.copy(
isInitialize=True) # Initialize
self.residualsTS = None # Residuals for selectedColumns
self.bootstrapResult = None # Result from bootstrapping
# Validation checks
self._validateFittedDataTransformDct()
self._bestParameters = _BestParameters(rssq=None, params=None)
else:
pass
def _makeMethods(self, methods, default):
"""
Creates a method dictionary.
Parameters
----------
methods: str/list-str/dict
method used for minimization in fitModel
dict: key-method, value-optional parameters
Returns
-------
list-OptimizerMethod
key: method name
value: dict of optional parameters
"""
if methods is None:
methods = default
if isinstance(methods, str):
if methods == METHOD_BOTH:
methods = METHOD_FITTER_DEFAULTS
else:
methods = [methods]
if isinstance(methods, list):
if isinstance(methods[0], str):
results = [
ModelFitterCore.OptimizerMethod(method=m, kwargs={})
for m in methods
]
else:
results = methods
else:
raise RuntimeError("Must be a list")
trues = [
isinstance(m, ModelFitterCore.OptimizerMethod) for m in results
]
if not all(trues):
raise ValueError("Invalid methods: %s" % str(methods))
return results
@classmethod
def mkParameters(
cls,
parameterDct: dict = None,
parametersToFit: list = None,
logger: Logger = Logger(),
lowerBound: float = PARAMETER_LOWER_BOUND,
upperBound: float = PARAMETER_UPPER_BOUND) -> lmfit.Parameters:
"""
Constructs lmfit parameters based on specifications.
Parameters
----------
parameterDct: key=name, value=ParameterSpecification
parametersToFit: list of parameters to fit
logger: error logger
lowerBound: lower value of range for parameters
upperBound: upper value of range for parameters
Returns
-------
lmfit.Parameters
"""
def get(value, base_value, multiplier):
if value is not None:
return value
return base_value * multiplier
#
if (parametersToFit is None) and (parameterDct is None):
raise RuntimeError("Must specify one of these parameters.")
if parameterDct is None:
parameterDct = {}
if parametersToFit is None:
parametersToFit = parameterDct.keys()
if logger is None:
logger = logger()
params = lmfit.Parameters()
for parameterName in parametersToFit:
if parameterName in parameterDct.keys():
specification = parameterDct[parameterName]
value = get(specification.value, specification.value, 1.0)
if value > 0:
lower_factor = LOWER_PARAMETER_MULT
upper_factor = UPPER_PARAMETER_MULT
else:
upper_factor = UPPER_PARAMETER_MULT
lower_factor = LOWER_PARAMETER_MULT
lower = get(specification.lower, specification.value,
lower_factor)
upper = get(specification.upper, specification.value,
upper_factor)
if np.isclose(lower - upper, 0):
upper = 0.0001
try:
params.add(parameterName,
value=value,
min=lower,
max=upper)
except Exception as err:
msg = "modelFitterCore/mkParameters parameterName %s" \
% parameterName
logger.error(msg, err)
else:
value = np.mean([lowerBound, upperBound])
params.add(parameterName,
value=value,
min=lowerBound,
max=upperBound)
return params
@classmethod
def initializeRoadrunnerModel(cls, modelSpecification):
"""
Sets self.roadrunnerModel.
Parameters
----------
modelSpecification: ExtendedRoadRunner/str
Returns
-------
ExtendedRoadRunner
"""
if isinstance(modelSpecification,
te.roadrunner.extended_roadrunner.ExtendedRoadRunner):
roadrunnerModel = modelSpecification
elif isinstance(modelSpecification, str):
roadrunnerModel = te.loada(modelSpecification)
else:
msg = 'Invalid model.'
msg = msg + "\nA model must either be a Roadrunner model "
msg = msg + "an Antimony model."
raise ValueError(msg)
return roadrunnerModel
@classmethod
def setupModel(cls, roadrunner, parameters, logger=Logger()):
"""
Sets up the model for use based on the parameter parameters
Parameters
----------
roadrunner: ExtendedRoadRunner
parameters: lmfit.Parameters
logger Logger
"""
pp = parameters.valuesdict()
for parameter in pp.keys():
try:
roadrunner.model[parameter] = pp[parameter]
except Exception as err:
msg = "_modelFitterCore.setupModel: Could not set value for %s" \
% parameter
logger.error(msg, err)
@classmethod
def runSimulation(
cls,
parameters=None,
roadrunner=None,
startTime=0,
endTime=5,
numPoint=30,
selectedColumns=None,
returnDataFrame=True,
_logger=Logger(),
_loggerPrefix="",
):
"""
Runs a simulation. Defaults to parameter values in the simulation.
Parameters
----------
roadrunner: ExtendedRoadRunner/str
Roadrunner model
parameters: lmfit.Parameters
lmfit parameters
startTime: float
start time for the simulation
endTime: float
end time for the simulation
numPoint: int
number of points in the simulation
selectedColumns: list-str
output columns in simulation
returnDataFrame: bool
return a DataFrame
_logger: Logger
_loggerPrefix: str
Return
------
NamedTimeseries (or None if fail to converge)
"""
if isinstance(roadrunner, str):
roadrunner = cls.initializeRoadrunnerModel(roadrunner)
else:
roadrunner.reset()
if parameters is not None:
# Parameters have been specified
cls.setupModel(roadrunner, parameters, logger=_logger)
# Do the simulation
if selectedColumns is not None:
newSelectedColumns = list(selectedColumns)
if TIME not in newSelectedColumns:
newSelectedColumns.insert(0, TIME)
try:
data = roadrunner.simulate(startTime, endTime, numPoint,
newSelectedColumns)
except Exception as err:
_logger.error("Roadrunner exception: ", err)
data = None
else:
try:
data = roadrunner.simulate(startTime, endTime, numPoint)
except Exception as err:
_logger.exception("Roadrunner exception: %s", err)
data = None
if data is None:
return data
fittedTS = NamedTimeseries(namedArray=data)
if returnDataFrame:
result = fittedTS.to_dataframe()
else:
result = fittedTS
return result
@classmethod
def rpConstruct(cls):
"""
Overrides rpickler.rpConstruct to create a method that
constructs an instance without arguments.
Returns
-------
Instance of cls
"""
return cls(None, None, None)
def rpRevise(self):
"""
Overrides rpickler.
"""
if "logger" not in self.__dict__.keys():
self.logger = Logger()
def _validateFittedDataTransformDct(self):
if self.fittedDataTransformDct is not None:
keySet = set(self.fittedDataTransformDct.keys())
selectedColumnsSet = self.selectedColumns
if (keySet is not None) and (selectedColumnsSet is not None):
excess = set(keySet).difference(selectedColumnsSet)
if len(excess) > 0:
msg = "Columns not in selectedColumns: %s" % str(excess)
raise ValueError(msg)
def _transformFittedTS(self, data):
"""
Updates the fittedTS taking into account required transformations.
Parameters
----------
data: np.ndarray
Results
----------
NamedTimeseries
"""
colnames = list(self.selectedColumns)
colnames.insert(0, TIME)
fittedTS = NamedTimeseries(array=data[:, :], colnames=colnames)
if self.fittedDataTransformDct is not None:
for column, func in self.fittedDataTransformDct.items():
if func is not None:
fittedTS[column] = func(fittedTS)
return fittedTS
@staticmethod
def _updateParameterDct(parameterDct):
"""
Handles values that are tuples instead of ParameterSpecification.
"""
if parameterDct is None:
parameterDct = {}
dct = dict(parameterDct)
for name, value in parameterDct.items():
if isinstance(value, tuple):
dct[name] = ParameterSpecification(lower=value[0],
upper=value[1],
value=value[2])
return dct
@staticmethod
def addParameter(parameterDct: dict, name: str, lower: float, upper: float,
value: float):
"""
Adds a parameter to a list of parameters.
Parameters
----------
parameterDct: parameter dictionary to agument
name: parameter name
lower: lower range of parameter value
upper: upper range of parameter value
value: initial value
Returns
-------
dict
"""
parameterDct[name] = ParameterSpecification(lower=lower,
upper=upper,
value=value)
def _adjustNames(self, antimonyModel:str, observedTS:NamedTimeseries) \
->typing.Tuple[NamedTimeseries, list]:
"""
Antimony exports can change the names of floating species
by adding a "_" at the end. Check for this and adjust
the names in observedTS.
Return
------
NamedTimeseries: newObservedTS
list: newSelectedColumns
"""
rr = te.loada(antimonyModel)
dataNames = rr.simulate().colnames
names = ["[%s]" % n for n in observedTS.colnames]
missingNames = [n[1:-1] for n in set(names).difference(dataNames)]
newSelectedColumns = list(self.selectedColumns)
if len(missingNames) > 0:
newObservedTS = observedTS.copy()
self.logger.exception("Missing names in antimony export: %s" %
str(missingNames))
for name in observedTS.colnames:
missingName = "%s_" % name
if name in missingNames:
newObservedTS = newObservedTS.rename(name, missingName)
newSelectedColumns.remove(name)
newSelectedColumns.append(missingName)
else:
newObservedTS = observedTS
return newObservedTS, newSelectedColumns
def copy(self, isKeepLogger=False):
"""
Creates a copy of the model fitter.
Preserves the user-specified settings and the results
of bootstrapping.
"""
if not isinstance(self.modelSpecification, str):
try:
modelSpecification = self.modelSpecification.getAntimony()
except Exception as err:
self.logger.error(
"Problem wth conversion to Antimony. Details:", err)
raise ValueError("Cannot proceed.")
observedTS, selectedColumns = self._adjustNames(
modelSpecification, self.observedTS)
else:
modelSpecification = self.modelSpecification
observedTS = self.observedTS.copy()
selectedColumns = self.selectedColumns
#
if isKeepLogger:
logger = self.logger
elif self.logger is not None:
logger = self.logger.copy()
else:
logger = None
newModelFitter = self.__class__(
copy.deepcopy(modelSpecification),
observedTS,
copy.deepcopy(self.parametersToFit),
selectedColumns=selectedColumns,
fitterMethods=self._fitterMethods,
bootstrapMethods=self._bootstrapMethods,
parameterLowerBound=self.lowerBound,
parameterUpperBound=self.upperBound,
parameterDct=copy.deepcopy(self.parameterDct),
fittedDataTransformDct=copy.deepcopy(self.fittedDataTransformDct),
logger=logger,
isPlot=self._isPlot)
if self.bootstrapResult is not None:
newModelFitter.bootstrapResult = self.bootstrapResult.copy()
newModelFitter.params = newModelFitter.bootstrapResult.params
else:
newModelFitter.bootstrapResult = None
newModelFitter.params = self.params
return newModelFitter
def initializeRoadRunnerModel(self):
"""
Sets self.roadrunnerModel.
"""
self.roadrunnerModel = ModelFitterCore.initializeRoadrunnerModel(
self.modelSpecification)
def getDefaultParameterValues(self):
"""
Obtain the original values of parameters.
Returns
-------
dict:
key: parameter name
value: value of parameter
"""
dct = {}
self.initializeRoadRunnerModel()
self.roadrunnerModel.reset()
for parameterName in self.parametersToFit:
dct[parameterName] = self.roadrunnerModel.model[parameterName]
return dct
def simulate(self,
params=None,
startTime=None,
endTime=None,
numPoint=None):
"""
Runs a simulation. Defaults to parameter values in the simulation.
Parameters
----------
params: lmfit.Parameters
startTime: float
endTime: float
numPoint: int
Return
------
NamedTimeseries
"""
def setValue(default, parameter):
# Sets to default if parameter unspecified
if parameter is None:
return default
return parameter
#
startTime = setValue(self.observedTS.start, startTime)
endTime = setValue(self.observedTS.end, endTime)
numPoint = setValue(len(self.observedTS), numPoint)
#
if self.roadrunnerModel is None:
self.initializeRoadRunnerModel()
#
return ModelFitterCore.runSimulation(
parameters=params,
roadrunner=self.roadrunnerModel,
startTime=startTime,
endTime=endTime,
numPoint=numPoint,
selectedColumns=self.selectedColumns,
_logger=self.logger,
_loggerPrefix=self._loggerPrefix,
returnDataFrame=False)
def updateFittedAndResiduals(self, **kwargs) -> np.ndarray:
"""
Updates values of self.fittedTS and self.residualsTS
based on self.params.
Parameters
----------
kwargs: dict
arguments for simulation
Instance Variables Updated
--------------------------
self.fittedTS
self.residualsTS
Returns
-------
1-d ndarray of residuals
"""
self.fittedTS = self.simulate(**kwargs) # Updates self.fittedTS
residualsArr = self._residuals(self.params)
numRow = len(self.fittedTS)
numCol = len(residualsArr) // numRow
residualsArr = np.reshape(residualsArr, (numRow, numCol))
cols = self.selectedColumns
if self.residualsTS is None:
self.residualsTS = self.observedTS.subsetColumns(cols)
self.residualsTS[cols] = residualsArr
def _residuals(self, params) -> np.ndarray:
"""
Compute the residuals between objective and experimental data
Handle nan values in observedTS. This internal-only method
is implemented to maximize efficieency.
Parameters
----------
kwargs: dict
arguments for simulation
Returns
-------
1-d ndarray of residuals
"""
data = ModelFitterCore.runSimulation(
parameters=params,
roadrunner=self.roadrunnerModel,
startTime=self.observedTS.start,
endTime=self.observedTS.end,
numPoint=len(self.observedTS),
selectedColumns=self.selectedColumns,
_logger=self.logger,
_loggerPrefix=self._loggerPrefix,
returnDataFrame=False)
if data is None:
residualsArr = np.repeat(LARGE_RESIDUAL, len(self._observedArr))
else:
residualsArr = self._observedArr - data.flatten()
residualsArr = np.nan_to_num(residualsArr)
rssq = sum(residualsArr**2)
if (self._bestParameters.rssq is None) \
or (rssq < self._bestParameters.rssq):
self._bestParameters = _BestParameters(params=params.copy(),
rssq=rssq)
return residualsArr
def fitModel(self, params: lmfit.Parameters = None, max_nfev=100):
"""
Fits the model by adjusting values of parameters based on
differences between simulated and provided values of
floating species.
Parameters
----------
params: starting values of parameters
Example
-------
f.fitModel()
"""
ParameterDescriptor = collections.namedtuple(
"ParameterDescriptor",
"params method rssq kwargs minimizer minimizerResult")
MAX_NFEV = "max_nfev"
block = Logger.join(self._loggerPrefix, "fitModel")
guid = self.logger.startBlock(block)
self.initializeRoadRunnerModel()
self.params = None
if self.parametersToFit is not None:
if params is None:
params = self.mkParams()
# Fit the model to the data using one or more methods.
# Choose the result with the lowest residual standard deviation
paramResults = []
lastExcp = None
for idx, optimizerMethod in enumerate(self._fitterMethods):
method = optimizerMethod.method
kwargs = optimizerMethod.kwargs
if MAX_NFEV not in kwargs:
kwargs[MAX_NFEV] = max_nfev
for _ in range(self._numFitRepeat):
self._bestParameters = _BestParameters(params=None,
rssq=None)
minimizer = lmfit.Minimizer(self._residuals, params)
try:
minimizerResult = minimizer.minimize(method=method,
**kwargs)
except Exception as excp:
lastExcp = excp
msg = "Error minimizing for method: %s" % method
self.logger.error(msg, excp)
continue
params = self._bestParameters.params.copy()
rssq = np.sum(self._residuals(params)**2)
if len(paramResults) > idx:
if rssq >= paramResults[idx].rssq:
continue
parameterDescriptor = ParameterDescriptor(
params=params,
method=method,
rssq=rssq,
kwargs=dict(kwargs),
minimizer=minimizer,
minimizerResult=minimizerResult,
)
paramResults.append(parameterDescriptor)
if len(paramResults) == 0:
msg = "*** Minimizer failed for this model and data."
self.logger.error(msg, lastExcp)
else:
# Select the result that has the smallest residuals
sortedMethods = sorted(paramResults, key=lambda r: r.rssq)
bestMethod = sortedMethods[0]
self.params = bestMethod.params
self.minimizer = bestMethod.minimizer
self.minimizerResult = bestMethod.minimizerResult
# Ensure that residualsTS and fittedTS match the parameters
self.updateFittedAndResiduals(params=self.params)
self.logger.endBlock(guid)
def getFittedModel(self):
"""
Provides the roadrunner model with fitted parameters
Returns
-------
ExtendedRoadrunner
"""
self._checkFit()
self.roadrunnerModel.reset()
self._setupModel(self.params)
return self.roadrunnerModel
def _setupModel(self, parameters):
"""
Sets up the model for use based on the parameter parameters
Parameters
----------
parameters: lmfit.Parameters
"""
ModelFitterCore.setupModel(self.roadrunnerModel,
parameters,
logger=self.logger)
def mkParams(self, parameterDct: dict = None) -> lmfit.Parameters:
"""
Constructs lmfit parameters based on specifications.
Parameters
----------
parameterDct: key=name, value=ParameterSpecification
Returns
-------
lmfit.Parameters
"""
if parameterDct is None:
parameterDct = self.parameterDct
return ModelFitterCore.mkParameters(
parameterDct,
parametersToFit=self.parametersToFit,
logger=self.logger,
lowerBound=self.lowerBound,
upperBound=self.upperBound)
def _checkFit(self):
if self.params is None:
raise ValueError("Must use fitModel before using this method.")
def serialize(self, path):
"""
Serialize the model to a path.
Parameters
----------
path: str
File path
"""
newModelFitter = self.copy()
with open(path, "wb") as fd:
rpickle.dump(newModelFitter, fd)
@classmethod
def deserialize(cls, path):
"""
Deserialize the model from a path.
Parameters
----------
path: str
File path
Return
------
ModelFitter
Model is initialized.
"""
with open(path, "rb") as fd:
fitter = rpickle.load(fd)
fitter.initializeRoadRunnerModel()
return fitter