def __init__(self, **kwargs):
"""
Init function.
:param kwargs:
:raises PilotException: NotImplementedError for unknown fitting model, NotDefined if input data not defined.
"""
# extract parameters
self._model = kwargs.get('model', 'linear')
self._x = kwargs.get('x', None)
self._y = kwargs.get('y', None)
if not self._x or not self._y:
raise NotDefined('input data not defined')
if len(self._x) != len(self._y):
raise NotSameLength('input data (lists) have different lengths')
# base calculations
if self._model == 'linear':
self._ss = sum_square_dev(self._x)
self._ss2 = sum_dev(self._x, self._y)
self.set_slope()
self._xm = mean(self._x)
self._ym = mean(self._y)
self.set_intersect()
self.set_chi2()
else:
logger.warning("\'%s\' model is not implemented", self._model)
raise NotImplementedError()
def float_to_rounded_string(num, precision=3):
"""
Convert float to a string with a desired number of digits (the precision).
E.g. num=3.1415, precision=2 -> '3.14'.
:param num: number to be converted (float).
:param precision: number of desired digits (int)
:raises NotDefined: for undefined precisions and float conversions to Decimal.
:return: rounded string.
"""
try:
_precision = Decimal(10) ** -precision
except Exception as e:
raise NotDefined('failed to define precision=%s: %e' % (str(precision), e))
try:
s = Decimal(str(num)).quantize(_precision)
except Exception as e:
raise NotDefined('failed to convert %s to Decimal: %s' % (str(num), e))
return str(s)
def chi2(self):
"""
Return the chi2 of the fit.
:raises NotDefined: exception thrown if fit is not defined.
:return: chi2 (float).
"""
x2 = None
if self._fit:
x2 = self._fit.chi2()
else:
raise NotDefined('Fit has not been defined')
return x2
def intersect(self):
"""
Return the intersect of a linear fit, y(x) = slope * x + intersect.
:raises NotDefined: exception thrown if fit is not defined.
:return: intersect (float).
"""
intersect = None
if self._fit:
intersect = self._fit.intersect()
else:
raise NotDefined('Fit has not been defined')
return intersect
def slope(self):
"""
Return the slope of a linear fit, y(x) = slope * x + intersect.
:raises NotDefined: exception thrown if fit is not defined.
:return: slope (float).
"""
slope = None
if self._fit:
slope = self._fit.slope()
else:
raise NotDefined('Fit has not been defined')
return slope
def get_storage_id(self, ddmendpoint):
"""
Return the storage_id of a ddmendpoint.
:param ddmendpoint: ddmendpoint name.
:returns storage_id: storage_id of the ddmendpoint.
:raises NotDefined:
"""
if ddmendpoint not in self.ddmendpoint2storage_id:
self.resolve_ddmendpoint_storageid(ddmendpoint)
if ddmendpoint in self.ddmendpoint2storage_id:
storage_id = self.ddmendpoint2storage_id[ddmendpoint]
logger.info("Found storage id for ddmendpoint(%s): %s" % (ddmendpoint, storage_id))
return storage_id
else:
raise NotDefined("Cannot find the storage id for ddmendpoint: %s" % ddmendpoint)
def get_ddmendpoint(self, storage_id):
"""
Return the ddmendpoint name from a storage id.
:param storage_id: storage_id as an int.
:returns ddmendpoint: ddmendpoint name.
:raises NotDefined:
"""
storage_id = int(storage_id)
if storage_id not in self.storage_id2ddmendpoint:
self.resolve_ddmendpoint_storageid()
if storage_id in self.storage_id2ddmendpoint:
ddmendpoint = self.storage_id2ddmendpoint[storage_id]
logger.info("Found ddmendpoint for storage id(%s): %s" % (storage_id, ddmendpoint))
return ddmendpoint
else:
self.resolve_storage_data()
raise NotDefined("Cannot find ddmendpoint for storage id: %s" % storage_id)