import logging
import numpy as np
import xarray as xr
from ForMoSA.core.errors import ForMoSAError
from ForMoSA.grid.subgrid_base import SubGrid
from ForMoSA.grid.model_grid import ModelGrid
from ForMoSA.core.loggings import setup_logging
from ForMoSA.grid.grid_loader import GridLoader
from ForMoSA.filter.filter import PhotometryFilter
from ForMoSA.observation.observation_base import Observation
from ForMoSA.transform.photometric_effects import PhotometricEffects
from ForMoSA.transform.observed import ObservedModel, ObservedParameters
from ForMoSA.core.enums import ObservationType, WavelengthUnit, ParameterKind, LogLikelihoodType
[docs]
class SubGridPhotometry(SubGrid):
'''
Photometric subgrid class, which implements adaptation to a specific filter.
Parameters
----------
grid : xr.Dataset
Dataset containing the subgrid
parent_grid : ModelGrid
Parent model grid
Filter : np.ndarray[PhotometryFilter]
Instance of :class:~PhotometryFilter corresponding to the photometric filter
logger : logging.Logger
Logger
log_level : str
Level of the logger
display_unit : WavelengthUnit
Unit of the wavelength to display
name : str
Name of the subgrid
Notes
-----
Authors: Allan Denis
'''
def __init__(self, grid: xr.Dataset, parent_grid: ModelGrid, Filter: np.ndarray[PhotometryFilter], logger: logging.Logger | None = None, log_level: str = "INFO", display_unit: WavelengthUnit = WavelengthUnit.MICROMETER, name: str = 'Unknown'):
super().__init__(grid, parent_grid = parent_grid, logger=logger, log_level=log_level, name=name, display_unit=display_unit)
self._Filter = np.asarray(Filter, dtype = object)
self._validate_photometry()
# ================================================
# Representation
# ================================================
def __repr__(self) -> str:
return f"SubGridPhotometry name={self.name}"
# ================================================
# properties
# ================================================
@property
def GridType(self) -> ObservationType:
"""Observation type."""
return ObservationType.PHOTOMETRIC.obstype
@property
def wave_cont(self) -> np.ndarray | None:
"""Wavelengths for continuum removal."""
return None
@property
def res_cont(self) -> float | None:
"""Resolutions for continuum removal."""
return None
@property
def remove_continuum(self) -> bool:
"""Whether to remove continuum."""
return False
@property
def Filter(self) -> np.ndarray[PhotometryFilter]:
"""Filter."""
return self._Filter
@property
def relevant_parameter_kinds(self) -> list[ParameterKind]:
"""List of relevant parameter kinds the subgrid applies to."""
return [
ParameterKind.GRID,
ParameterKind.ALPHA,
ParameterKind.RADIUS,
ParameterKind.DISTANCE,
ParameterKind.AV,
ParameterKind.BB_T,
ParameterKind.BB_R
]
# ======================================================
# Class methods
# ======================================================
[docs]
@classmethod
def from_parent(cls, parent_grid: ModelGrid, Filter: np.ndarray[PhotometryFilter], name: str = 'unknown', logger: logging.Logger | None = None, log_level: str = 'INFO', display_unit: WavelengthUnit = WavelengthUnit.MICROMETER) -> 'SubGridPhotometry':
'''
Build Photometric subgrid from the parent grid, target_wavelength.
Parameters
----------
parent_grid : ModelGrid
Instance of ModelGrid
Filter : np.ndarray[PhotometryFilter]
Arrays containing instances of class PhotometryFilter corresponding to the photometric filter
name : str
Name of the subgrid
logger : logging.Logger | None
Logger
log_level : str
Level of the Logger
display_unit : WavelengthUnit
Unit to display for the wavelength
Returns
-------
SubGridPhotometryy
Instance of SubGridPhotometry
Examples
--------
>>> subgrid = SubGridPhotometry.from_parent(parent_grid, Filter, name, logger, log_level, display_unit)
Notes
-----
Authors: Allan Denis
'''
subgrid = cls(
grid=parent_grid.grid,
parent_grid=parent_grid,
Filter=Filter,
name=name,
logger=logger,
log_level=log_level,
display_unit=display_unit,
)
target_wavelength = np.array([])
for filt in Filter:
target_wavelength = np.append(target_wavelength, filt.central_wavelength)
subgrid._grid = subgrid._build_empty_adapted_grid(target_wavelength=target_wavelength, target_resolution=np.array([0] * len(target_wavelength)))
subgrid.adapt()
return subgrid
[docs]
@classmethod
def from_grid(cls, ds: xr.Dataset, parent_grid: ModelGrid, logger: logging.Logger | None = None, log_level: str = 'INFO', display_unit: WavelengthUnit = WavelengthUnit.MICROMETER) -> 'SubGridPhotometry':
'''
Retrieve photometric subgrid from grid.
Parameters
----------
dx : xr.Dataset
Grid data
parent_grid : ModelGrid
Instance of ModelGrid
logger : logging.Logger | None
Logger
log_level : str
Level of the Logger
display_unit : WavelengthUnit
Unit to display for the wavelength
Returns
-------
SubGridPhotometry
Instance of SubGridPhotometry
Examples
--------
>>> subgrid = SubGridPhotometry.from_grid(ds, parent_grid, logger, log_level, display_unit)
Notes
-----
Authors: Allan Denis
'''
logger = logger or setup_logging(level=log_level, name='SubGridPhotometry')
# Validation
try:
GridLoader._validate_model_grid_dataset(ds)
except ForMoSAError as e:
raise ForMoSAError(e, logger)
if ds.attrs.get("grid_type") != ObservationType.PHOTOMETRIC.value:
raise ForMoSAError(f"Wrong grid type: {ds.attrs.get('grid_type')}. Expected {ObservationType.PHOTOMETRIC.value}")
name = ds.attrs.get('name', 'unknown')
filter_name = ds.attrs.get("filter_name")
if isinstance(filter_name, str):
filter_name = [filter_name]
Filter = []
for name in filter_name:
Filter.append(PhotometryFilter._from_filter_name(name))
logger.info(' Creating photometric SubGrid from dataset')
return cls(
grid=ds,
parent_grid=parent_grid,
Filter=Filter,
name=name,
logger=logger,
log_level=log_level,
display_unit=display_unit,
)
# ======================================================
# Methods
# ======================================================
def _validate_photometry(self) -> None:
'''
Check the consistency between the target wavelength and the wavelengths of the filter.
Notes
-----
Authors: Allan Denis
'''
for filt in self.Filter:
if not isinstance(filt, PhotometryFilter):
raise ForMoSAError('Filter must be an array of PhotometryFilter objects', self.logger)
filt._set_unit(WavelengthUnit[str(self.unit)])
[docs]
def adapt(self) -> None:
'''
Adapt the native grid to the target wavelength and resolution.
Notes
-----
Authors: Allan Denis
'''
self.adapt_grid()
self._grid.attrs['filter_name'] = [filt.name for filt in self.Filter]
def _get_restriction_bounds(self) -> tuple[float, float]:
'''
Get restriction bounds for computing the restricted subgrid before the adaptation of the subgrid.
Returns
-------
tuple[float, float]
Minimumn and maximum wavelengths of the restricted subgrid
Notes
-----
Authors: Allan Denis
'''
margin = 0.05 # 5% margin
wavelength_min, wavelength_max = [], []
for filt in self.Filter:
wavelength_min.append(filt.wavelength_min * (1 - margin))
wavelength_max.append(filt.wavelength_max * (1 + margin))
return np.min(wavelength_min), np.max(wavelength_max)
def _adapt_model(self, model_to_adapt: xr.DataArray):
'''
Method to adapt a specific model to the photometric filter.
Parameters
----------
model_to_adapt : xr.DataArray
Model to adapt
Returns
-------
model_adapted
Notes
-----
Authors: Allan Denis
'''
model_adapted = self.integrate_filter_curve(model_to_adapt)
return model_adapted
def _apply_physics_effects(self, observed_model: ObservedModel, observed_params: ObservedParameters) -> xr.DataArray:
'''
Apply the physics effects relevant to photometry.
Parameters
----------
observed_model : ObservedModel
Model to modify.
params : ObservedParameters
Dictionary of parameters values.
Returns
-------
(ObservedModel): observed_model transformed by the physics effects
Notes
-----
Authors: Allan Denis
'''
# Parameters relevant to spectroscopy
allowed_kinds = set(self.relevant_parameter_kinds)
# Check provided parameters
invalid = [p.kind for p in observed_params.values.keys() if p.kind not in allowed_kinds]
if invalid:
raise ForMoSAError(f"<Parameters {invalid} are not relevant for photometric subgrid>")
return PhotometricEffects._apply_physics(observed_model, observed_params)
[docs]
def integrate_filter_curve(self, model_to_adapt: xr.DataArray, print_logger: bool = False) -> float:
'''
Method to integrate the filter curve on a spectrum
Parameters
----------
model_to_adapt : xr.DataArray
Model to integrate
Returns
-------
xr.DataArray
Integrated value under the filter curve
Notes
-----
Authors: Allan Denis
'''
if print_logger:
self.logger.debug(f'Integrate filter curve of {self.Filter.name} on the spectrum')
trans_total = []
wave_total = []
wave_model = model_to_adapt.wavelength.values
flux_model = model_to_adapt.values
for filt in self.Filter:
# Filter wavelength and transmission
wave_filt = filt.wavelength
trans_filt = filt.transmission
# Interpolation of transmission onto grid wavelength
trans_interp = np.interp(
wave_model,
wave_filt,
trans_filt,
left=0.0,
right=0.0
)
# integration
numerator = np.trapz(flux_model * trans_interp, wave_model)
denominator = np.trapz(trans_interp, wave_model)
if denominator == 0:
flux = np.nan
else:
flux = numerator / denominator
trans_total.append(flux)
wave_total.append(filt.central_wavelength)
# final concatenation
result_da = xr.DataArray(
data=np.array(trans_total),
coords={"wavelength": wave_total},
dims=("wavelength",),
)
return result_da
def _apply_observational_effects(self, observed_model: ObservedModel, obs: Observation, bounds_lsq: tuple[float, float] =(-np.inf, np.inf)) -> ObservedModel:
'''
Apply the observational effects relevant to photometry.
Parameters
----------
observed_model : ObservedModel
Instance of class ObservedModel to transform
obs : Observation
Instance of class Observation
bounds_lsq : tuple[float, float]
Bounds for the least squares
Returns
-------
ObservedModel
Instance of class ObservedModel transformed
Notes
-----
Authors: Allan Denis
'''
return PhotometricEffects._apply_observation(observed_model, obs, bounds_lsq)
def _compute_loglike(self, observed_model: ObservedModel, obs: Observation, logL_type: LogLikelihoodType) -> float:
'''
Compute the loglikelihood given an ObservedModel, an Observation and a loglikelihood function.
Parameters
----------
observed_model : ObservedModel
Observed model
obs : Observation
Observation
logL_type : LogLikelihoodType
Loglikelihood function
Returns
-------
float
logL value
Notes
-----
Authors: Simon Petrus, Matthieu Ravet and Allan Denis
'''
return PhotometricEffects._compute_loglike(observed_model, obs, logL_type)
# def _determine_target_wavelength_and_resolution(self, target_resolution: str | float) -> tuple[np.ndarray, np.ndarray]:
# '''
# Determine the target wavelength and resolution grids.
# Parameters
# ----------
# target_resolution (str | float): Target resolution to reach ('obs', 'mod', float)
# Returns
# -------
# tuple[np.ndarray, np.ndarray]: Target wavelength and resolution arrays
# Authors: Allan Denis
# '''
# # Update the native unit to the unit of the observation
# self._native_unit = self.observation._display_unit
# return self.observation.wave, np.zeros(len(self.observation.wave))
