def searchdask(a, v, how=None, atol=None):
n_a = a.shape[0]
searchfunc, args = presearch(a, v)
if how == 'nearest':
l_index = da.maximum(searchfunc(*args, side='right') - 1, 0)
r_index = da.minimum(searchfunc(*args), n_a - 1)
cond = 2 * v < (select(a, r_index) + select(a, l_index))
indexer = da.maximum(da.where(cond, l_index, r_index), 0)
elif how == 'bfill':
indexer = searchfunc(*args)
elif how == 'ffill':
indexer = searchfunc(*args, side='right') - 1
indexer = da.where(indexer == -1, n_a, indexer)
elif how is None:
l_index = searchfunc(*args)
r_index = searchfunc(*args, side='right')
indexer = da.where(l_index == r_index, n_a, l_index)
else:
return NotImplementedError
if atol is not None:
a2 = da.concatenate([a, [atol + da.max(v) + 1]])
indexer = da.where(
da.absolute(select(a2, indexer) - v) > atol, n_a, indexer)
return indexer
def envelope(self, darray, preview=None):
"""
Description
-----------
Compute the Envelope of the input data
Parameters
----------
darray : Array-like, acceptable inputs include Numpy, HDF5, or Dask Arrays
Keywork Arguments
-----------------
preview : str, enables or disables preview mode and specifies direction
Acceptable inputs are (None, 'inline', 'xline', 'z')
Optimizes chunk size in different orientations to facilitate rapid
screening of algorithm output
Returns
-------
result : Dask Array
"""
kernel = (1, 1, 25)
darray, chunks_init = self.create_array(darray,
kernel,
preview=preview)
analytical_trace = darray.map_blocks(util.hilbert, dtype=darray.dtype)
result = da.absolute(analytical_trace)
result = util.trim_dask_array(result, kernel)
return (result)
def __call__(self, projectables, optional_datasets=None, **info):
"""Get the corrected reflectance when removing Rayleigh scattering.
Uses pyspectral.
"""
from pyspectral.rayleigh import Rayleigh
if not optional_datasets or len(optional_datasets) != 4:
vis, red = self.match_data_arrays(projectables)
sata, satz, suna, sunz = self.get_angles(vis)
red.data = da.rechunk(red.data, vis.data.chunks)
else:
vis, red, sata, satz, suna, sunz = self.match_data_arrays(
projectables + optional_datasets)
sata, satz, suna, sunz = optional_datasets
# get the dask array underneath
sata = sata.data
satz = satz.data
suna = suna.data
sunz = sunz.data
# First make sure the two azimuth angles are in the range 0-360:
sata = sata % 360.
suna = suna % 360.
ssadiff = da.absolute(suna - sata)
ssadiff = da.minimum(ssadiff, 360 - ssadiff)
del sata, suna
atmosphere = self.attrs.get('atmosphere', 'us-standard')
aerosol_type = self.attrs.get('aerosol_type', 'marine_clean_aerosol')
rayleigh_key = (vis.attrs['platform_name'], vis.attrs['sensor'],
atmosphere, aerosol_type)
logger.info(
"Removing Rayleigh scattering with atmosphere '%s' and "
"aerosol type '%s' for '%s'", atmosphere, aerosol_type,
vis.attrs['name'])
if rayleigh_key not in self._rayleigh_cache:
corrector = Rayleigh(vis.attrs['platform_name'],
vis.attrs['sensor'],
atmosphere=atmosphere,
aerosol_type=aerosol_type)
self._rayleigh_cache[rayleigh_key] = corrector
else:
corrector = self._rayleigh_cache[rayleigh_key]
try:
refl_cor_band = corrector.get_reflectance(sunz, satz, ssadiff,
vis.attrs['name'],
red.data)
except (KeyError, IOError):
logger.warning(
"Could not get the reflectance correction using band name: %s",
vis.attrs['name'])
logger.warning(
"Will try use the wavelength, however, this may be ambiguous!")
refl_cor_band = corrector.get_reflectance(
sunz, satz, ssadiff, vis.attrs['wavelength'][1], red.data)
proj = vis - refl_cor_band
proj.attrs = vis.attrs
self.apply_modifier_info(vis, proj)
return proj
def instantaneous_frequency(self, darray, sample_rate=4, preview=None):
"""
Description
-----------
Compute the Instantaneous Frequency of the input data
Parameters
----------
darray : Array-like, acceptable inputs include Numpy, HDF5, or Dask Arrays
Keywork Arguments
-----------------
sample_rate : Number, sample rate in milliseconds (ms)
preview : str, enables or disables preview mode and specifies direction
Acceptable inputs are (None, 'inline', 'xline', 'z')
Optimizes chunk size in different orientations to facilitate rapid
screening of algorithm output
Returns
-------
result : Dask Array
"""
darray, chunks_init = self.create_array(darray, preview=preview)
fs = 1000 / sample_rate
phase = self.instantaneous_phase(darray)
phase = da.deg2rad(phase)
phase = phase.map_blocks(np.unwrap, dtype=darray.dtype)
phase_prime = sp().first_derivative(phase, axis=-1)
result = da.absolute((phase_prime / (2.0 * np.pi) * fs))
return (result)
def _select_by_prediction(self, unlabel_index, predict, batch_size=1):
predict_shape = da.shape(predict)
assert (len(predict_shape) in [1, 2])
if len(predict_shape) == 2:
if predict_shape[1] != 1:
raise Exception(
'1d or 2d with 1 column array is expected, but received: \n%s'
% str(predict))
else:
pv = da.absolute(predict.flatten())
else:
pv = da.absolute(predict)
tpl = da.from_array(unlabel_index)
return tpl[nsmallestarg(pv, batch_size)].compute()
def power_spectrum(filter, time):
"""Compute the mean power spectrum over all particles at a given time.
This routine gives the power spectrum (power spectral density) for
each of the sampled variables within `filter`, as a mean over
all particles. It will run a single advection step at the
specified time. The resulting dictionary contains a `freq` item,
with the FFT frequency bins for the output spectra.
Args:
filter (filtering.LagrangeFilter): The pre-configured filter object
to use for running the analysis.
time (float): The time at which to perform the analysis.
Returns:
Dict[str, numpy.ndarray]: A dictionary of power spectra for each of
the sampled variables on the filter.
"""
psds = {}
advection_data = filter.advection_step(time, output_time=True)
time_series = advection_data.pop("time")
for v, a in advection_data.items():
spectra = da.fft.fft(a[1].rechunk((-1, "auto")), axis=0)
mean_spectrum = da.nanmean(da.absolute(spectra) ** 2, axis=1)
psds[v] = mean_spectrum.compute()
psds["freq"] = 2 * np.pi * np.fft.fftfreq(time_series.size, filter.output_dt)
return psds
def instantaneous_bandwidth(self, darray, preview=None):
"""
Description
-----------
Compute the Instantaneous Bandwidth of the input data
Parameters
----------
darray : Array-like, acceptable inputs include Numpy, HDF5, or Dask Arrays
Keywork Arguments
-----------------
preview : str, enables or disables preview mode and specifies direction
Acceptable inputs are (None, 'inline', 'xline', 'z')
Optimizes chunk size in different orientations to facilitate rapid
screening of algorithm output
Returns
-------
result : Dask Array
"""
darray, chunks_init = self.create_array(darray, preview=preview)
rac = self.relative_amplitude_change(darray)
result = da.absolute(rac) / (2.0 * np.pi)
return (result)
def _ttest_finish(df, t):
"""Common code between all 3 t-test functions."""
# XXX: np.abs -> da.absolute
# XXX: delayed(distributions.t.sf)
prob = delayed(distributions.t.sf)(da.absolute(t),
df) * 2 # use np.abs to get upper tail
if t.ndim == 0:
t = t[()]
return t, prob
def pis_mVc(x,y,beta):
'''
rewrite mVc and mMSE,share the 'p' and 'dif'!!!!
'''
p=logistic_func(beta, x)
dif=da.absolute(y-p)
xnorm=da.linalg.norm(x,axis=1)
pis=dif*xnorm
pi=pis/da.sum(pis)
return pi
def _ttest_finish(df, t):
"""Common code between all 3 t-test functions."""
# XXX: np.abs -> da.absolute
# XXX: delayed(distributions.t.sf)
prob = (delayed(distributions.t.sf)(da.absolute(t), df) * 2
) # use np.abs to get upper tail
if t.ndim == 0:
t = t[()]
return t, prob
def __call__(self, projectables, optional_datasets=None, **info):
"""Get the corrected reflectance when removing Rayleigh scattering.
Uses pyspectral.
"""
from pyspectral.rayleigh import Rayleigh
if not optional_datasets or len(optional_datasets) != 4:
vis, red = self.check_areas(projectables)
sata, satz, suna, sunz = self.get_angles(vis)
red.data = da.rechunk(red.data, vis.data.chunks)
else:
vis, red, sata, satz, suna, sunz = self.check_areas(
projectables + optional_datasets)
sata, satz, suna, sunz = optional_datasets
# get the dask array underneath
sata = sata.data
satz = satz.data
suna = suna.data
sunz = sunz.data
LOG.info('Removing Rayleigh scattering and aerosol absorption')
# First make sure the two azimuth angles are in the range 0-360:
sata = sata % 360.
suna = suna % 360.
ssadiff = da.absolute(suna - sata)
ssadiff = da.minimum(ssadiff, 360 - ssadiff)
del sata, suna
atmosphere = self.attrs.get('atmosphere', 'us-standard')
aerosol_type = self.attrs.get('aerosol_type', 'marine_clean_aerosol')
rayleigh_key = (vis.attrs['platform_name'],
vis.attrs['sensor'], atmosphere, aerosol_type)
if rayleigh_key not in self._rayleigh_cache:
corrector = Rayleigh(vis.attrs['platform_name'], vis.attrs['sensor'],
atmosphere=atmosphere,
aerosol_type=aerosol_type)
self._rayleigh_cache[rayleigh_key] = corrector
else:
corrector = self._rayleigh_cache[rayleigh_key]
try:
refl_cor_band = corrector.get_reflectance(sunz, satz, ssadiff,
vis.attrs['name'],
red.data)
except (KeyError, IOError):
LOG.warning("Could not get the reflectance correction using band name: %s", vis.attrs['name'])
LOG.warning("Will try use the wavelength, however, this may be ambiguous!")
refl_cor_band = corrector.get_reflectance(sunz, satz, ssadiff,
vis.attrs['wavelength'][1],
red.data)
proj = vis - refl_cor_band
proj.attrs = vis.attrs
self.apply_modifier_info(vis, proj)
return proj
def compute_power_spectrum(xarr, r_bins=100, x_dim='X', y_dim='Y'):
"""
Compute the radially-binned power spectrum of individual images. Intended use case if
for xarr to be a set of z stacks of brightfield images.
Parameters
----------
xarr : xarray.DataArray
DataArray backed by dask arrays. If the DataArray does not have named dimensions
"x" and "y" assume that the last two dimensions correspond to image dimensions.
r_bins : int
Number of bins to use for radial histogram. Default 100.
x_dim : str default 'X'
Name of dimension corresponding to X pixels
y_dim : str default 'Y'
Name of dimension corresponding to Y pixels
Returns
-------
log_power_spectrum : (..., r_bins)
Log power spectrum of each individiual image in xarr.
"""
if not isinstance(xarr, xr.DataArray):
raise TypeError(
"Can only compute power spectra for xarray.DataArrays.")
if not isinstance(xarr.data, da.Array):
xarr.data = da.array(xarr.data)
fft_mags = xr.DataArray(
da.fft.fftshift(da.absolute(da.fft.fft2(xarr.data))**2),
dims=xarr.dims,
coords=xarr.coords,
)
fft_mags.coords[x_dim] = np.arange(
fft_mags[x_dim].shape[0]) - fft_mags[x_dim].shape[0] / 2
fft_mags.coords[y_dim] = np.arange(
fft_mags[y_dim].shape[0]) - fft_mags[y_dim].shape[0] / 2
logR = 0.5 * xr.ufuncs.log1p(fft_mags.coords[x_dim]**2 +
fft_mags.coords[y_dim]**2)
log_power_spectra = xr.ufuncs.log1p(
fft_mags.groupby_bins(
logR, bins=r_bins).mean(dim=f"stacked_{x_dim}_{y_dim}"))
log_power_spectra["group_bins"] = pd.IntervalIndex(
log_power_spectra.group_bins.values).mid.values
return log_power_spectra
def calc_amplitude(ydata):
"""Convert complex data to amplitude (absolute value)
Parameters
----------
ydata : :obj:`xarray.DataArray`
y axis data to be processed
Returns
-------
amplitude : :obj:`xarray.DataArray`
:attr:`ydata` converted to an amplitude
"""
logger.debug("Calculating amplitude data")
amplitude = da.absolute(ydata)
return amplitude
def searchdaskuniform(a0, step, n_a, v, how=None, atol=None):
index = (v - a0) / step
if how == 'nearest':
indexer = da.maximum(da.minimum(da.around(index), n_a - 1), 0)
elif how == 'bfill':
indexer = da.maximum(da.ceil(index), 0)
elif how == 'ffill':
indexer = da.minimum(da.floor(index), n_a - 1)
elif how is None:
indexer = da.ceil(index)
indexer = da.where(indexer != index, n_a, indexer)
if atol is not None:
indexer = da.where((da.absolute(indexer - index) * step > atol) |
(indexer < 0) | (indexer >= n_a), n_a, indexer)
else:
indexer = da.where((indexer < 0) | (indexer >= n_a), n_a, indexer)
return indexer.astype(int)
def wiener(data, aux, fr, fr_npy, L):
return uirdft2((da.conj(fr) * urdft2(data) + L * urdft2(aux)) /
(da.absolute(fr_npy)**2 + L))
def smooth(xds,
dv='IMAGE',
kernel='gaussian',
size=[1., 1., 30.],
current=None,
scale=1.0,
name='BEAM'):
"""
Smooth data along the spatial plane of the image cube.
Computes a correcting beam to produce defined size when kernel=gaussia and current is defined. Otherwise the size
or existing beam is used directly.
Parameters
----------
xds : xarray.core.dataset.Dataset
input Image Dataset
dv : str
name of data_var in xds to smooth. Default is 'IMAGE'
kernel : str
Type of kernel to use:'boxcar', 'gaussian' or the name of a data var in this xds. Default is 'gaussian'.
size : list of floats
list of three values corresponding to major and minor axes (in arcseconds) and position angle (in degrees).
current : list of floats
same structure as size, a list of three values corresponding to major and minor axes (in arcseconds) and position
angle (in degrees) of the current beam applied to the image. Default is None
scale : float
gain factor after convolution. Default is unity gain (1.0)
name : str
dataset variable name for kernel, overwrites if already present
Returns
-------
xarray.core.dataset.Dataset
output Image
"""
import xarray
import dask.array as da
import numpy as np
import cngi._helper.beams as chb
# compute kernel beam
size_corr = None
if kernel in xds.data_vars:
beam = xds[kernel] / xds[kernel].sum(axis=[0, 1])
elif kernel == 'gaussian':
beam, parms_tar = chb.synthesizedbeam(size[0], size[1], size[2],
len(xds.d0), len(xds.d1),
xds.incr[:2])
beam = xarray.DataArray(da.from_array(beam /
np.sum(beam, axis=(0, 1))),
dims=['d0', 'd1'],
name=name) # normalized to unity
cf_tar = ((4 * np.pi**2) /
(4 * parms_tar[0] * parms_tar[2] -
parms_tar[1]**2)) * parms_tar # equation 12
size_corr = size
else: # boxcar
incr = np.abs(xds.incr[:2]) * 180 / np.pi * 60 * 60
xx, yy = np.mgrid[:int(np.round(size[0] / incr[0])
), :int(np.round(size[1] / incr[1]))]
box = np.array(
(xx.ravel() - np.max(xx) // 2,
yy.ravel() - np.max(yy) // 2)) + np.array(
[len(xds.d0) // 2, len(xds.d1) // 2])[:, None]
beam = np.zeros((len(xds.d0), len(xds.d1)))
beam[box[0], box[1]] = 1.0
beam = xarray.DataArray(da.from_array(beam /
np.sum(beam, axis=(0, 1))),
dims=['d0', 'd1'],
name=name) # normalized to unity
# compute the correcting beam if necessary
# this is done analytically using the parameters of the current beam, not the actual data
# see equations 19 - 26 here:
# https://casa.nrao.edu/casadocs-devel/stable/memo-series/casa-memos/casa_memo10_restoringbeam.pdf/view
if (kernel == 'gaussian') and (current is not None):
parms_curr = chb.synthesizedbeam(current[0], current[1], current[2],
len(xds.d0), len(xds.d1),
xds.incr[:2])[1]
cf_curr = ((4 * np.pi**2) /
(4 * parms_curr[0] * parms_curr[2] -
parms_curr[1]**2)) * parms_curr # equation 12
cf_corr = (cf_tar - cf_curr) # equation 19
c_corr = ((4 * np.pi**2) / (4 * cf_corr[0] * cf_corr[2] -
cf_corr[1]**2)) * cf_corr # equation 12
# equations 21 - 23
d1 = np.sqrt(8 * np.log(2) /
((c_corr[0] + c_corr[2]) -
np.sqrt(c_corr[0]**2 - 2 * c_corr[0] * c_corr[2] +
c_corr[2]**2 + c_corr[1]**2)))
d2 = np.sqrt(8 * np.log(2) /
((c_corr[0] + c_corr[2]) +
np.sqrt(c_corr[0]**2 - 2 * c_corr[0] * c_corr[2] +
c_corr[2]**2 + c_corr[1]**2)))
theta = 0.5 * np.arctan2(-c_corr[1], c_corr[2] - c_corr[0])
# make a beam out of the correcting size
incr_arcsec = np.abs(xds.incr[:2]) * 180 / np.pi * 60 * 60
size_corr = [
d1 * incr_arcsec[0], d2 * incr_arcsec[1], theta * 180 / np.pi
]
scale_corr = (4 * np.log(2) / (np.pi * d1 * d2)) * (
size[0] * size[1] / (current[0] * current[1])) # equation 20
beam = scale_corr * chb.synthesizedbeam(size_corr[0], size_corr[1],
size_corr[2], len(xds.d0),
len(xds.d1), xds.incr[:2])[0]
beam = xarray.DataArray(
da.from_array(beam),
dims=[xds[dv].dims[dd] for dd in range(beam.ndim)],
name=name)
# scale and FFT the kernel beam
da_beam = da.atleast_3d(beam.data)
if da_beam.ndim < 4: da_beam = da_beam[:, :, :, None]
ft_beam = da.fft.fft2((da_beam * scale), axes=[0, 1])
# FFT the image, multiply by the kernel beam FFT, then inverse FFT it back
ft_image = da.fft.fft2(xds[dv].data, axes=[0, 1])
ft_smooth = ft_image * ft_beam
ift_smooth = da.fft.fftshift(da.fft.ifft2(ft_smooth, axes=[0, 1]),
axes=[0, 1])
# store the smooth image and kernel beam back in the xds
xda_smooth = xarray.DataArray(da.absolute(ift_smooth),
dims=xds[dv].dims,
coords=xds[dv].coords)
new_xds = xds.assign({dv: xda_smooth, name: beam * scale})
if size_corr is not None:
new_xds = new_xds.assign_attrs({name + '_params': tuple(size_corr)})
return new_xds
def absolute(A):
return da.absolute(A)
def make_psf(self):
print("Making PSF", file=log)
psfs = []
self.stokes_weights = {}
self.uvws = {}
for ims in self.ms:
xds = xds_from_ms(ims,
group_cols=('FIELD_ID', 'DATA_DESC_ID'),
chunks=self.chunks[ims],
columns=self.columns)
# subtables
ddids = xds_from_table(ims + "::DATA_DESCRIPTION")
fields = xds_from_table(ims + "::FIELD", group_cols="__row__")
spws = xds_from_table(ims + "::SPECTRAL_WINDOW",
group_cols="__row__")
pols = xds_from_table(ims + "::POLARIZATION", group_cols="__row__")
# subtable data
ddids = dask.compute(ddids)[0]
fields = dask.compute(fields)[0]
spws = dask.compute(spws)[0]
pols = dask.compute(pols)[0]
self.stokes_weights[ims] = {}
self.uvws[ims] = {}
for ds in xds:
field = fields[ds.FIELD_ID]
radec = field.PHASE_DIR.data.squeeze()
if not np.array_equal(radec, self.radec):
continue
# this is not correct, need to use spw
spw = ds.DATA_DESC_ID
freq_bin_idx = self.freq_bin_idx[ims][spw]
freq_bin_counts = self.freq_bin_counts[ims][spw]
freq = self.freq[ims][spw]
uvw = ds.UVW.data
flag = getattr(ds, self.flag_column).data
weights = getattr(ds, self.weight_column).data
if len(weights.shape) < 3:
weights = da.broadcast_to(weights[:, None, :],
flag.shape,
chunks=flag.chunks)
if self.imaging_weight_column is not None:
imaging_weights = getattr(ds,
self.imaging_weight_column).data
if len(imaging_weights.shape) < 3:
imaging_weights = da.broadcast_to(
imaging_weights[:, None, :],
flag.shape,
chunks=flag.chunks)
weightsxx = imaging_weights[:, :, 0] * weights[:, :, 0]
weightsyy = imaging_weights[:, :, -1] * weights[:, :, -1]
else:
weightsxx = weights[:, :, 0]
weightsyy = weights[:, :, -1]
# for the PSF we need to scale the weights by the
# Mueller amplitudes squared
if self.mueller_column is not None:
mueller = getattr(ds, self.mueller_column).data
weightsxx *= da.absolute(mueller[:, :, 0])**2
weightsyy *= da.absolute(mueller[:, :, -1])**2
# weighted sum corr to Stokes I
weights = weightsxx + weightsyy
# only keep data where both corrs are unflagged
flagxx = flag[:, :, 0]
flagyy = flag[:, :, -1]
flag = ~(flagxx | flagyy) # ducc0 convention
weights *= flag
data = weights.astype(np.complex64)
psf = vis2im(uvw,
freq,
data,
freq_bin_idx,
freq_bin_counts,
self.nx_psf,
self.ny_psf,
self.cell,
flag=flag.astype(np.uint8),
nthreads=self.nthreads,
epsilon=self.epsilon,
do_wstacking=self.do_wstacking,
double_accum=True)
psfs.append(psf)
# assumes that stokes weights and uvw fit into memory
# self.stokes_weights[ims][spw] = dask.persist(weights.rechunk({0:-1}))[0]
# self.uvws[ims][spw] = dask.persist(uvw.rechunk({0:-1}))[0]
# for comparison with numpy implementation
# self.stokes_weights[ims][spw] = dask.compute(weights)[0]
# self.uvws[ims][spw] = dask.compute(uvw)[0]
# import pdb
# pdb.set_trace()
psfs = dask.compute(psfs, scheduler='single-threaded')[0]
return accumulate_dirty(psfs, self.nband,
self.band_mapping).astype(self.real_type)
def make_dirty(self):
print("Making dirty", file=log)
dirty = da.zeros((self.nband, self.nx, self.ny),
dtype=np.float32,
chunks=(1, self.nx, self.ny),
name=False)
dirties = []
for ims in self.ms:
xds = xds_from_ms(ims,
group_cols=('FIELD_ID', 'DATA_DESC_ID'),
chunks=self.chunks[ims],
columns=self.columns)
# subtables
ddids = xds_from_table(ims + "::DATA_DESCRIPTION")
fields = xds_from_table(ims + "::FIELD", group_cols="__row__")
spws = xds_from_table(ims + "::SPECTRAL_WINDOW",
group_cols="__row__")
pols = xds_from_table(ims + "::POLARIZATION", group_cols="__row__")
# subtable data
ddids = dask.compute(ddids)[0]
fields = dask.compute(fields)[0]
spws = dask.compute(spws)[0]
pols = dask.compute(pols)[0]
for ds in xds:
field = fields[ds.FIELD_ID]
radec = field.PHASE_DIR.data.squeeze()
if not np.array_equal(radec, self.radec):
continue
spw = ds.DATA_DESC_ID # this is not correct, need to use spw
freq_bin_idx = self.freq_bin_idx[ims][spw]
freq_bin_counts = self.freq_bin_counts[ims][spw]
freq = self.freq[ims][spw]
freq_chunk = freq_bin_counts[0].compute()
uvw = ds.UVW.data
data = getattr(ds, self.data_column).data
dataxx = data[:, :, 0]
datayy = data[:, :, -1]
weights = getattr(ds, self.weight_column).data
if len(weights.shape) < 3:
weights = da.broadcast_to(weights[:, None, :],
data.shape,
chunks=data.chunks)
if self.imaging_weight_column is not None:
imaging_weights = getattr(ds,
self.imaging_weight_column).data
if len(imaging_weights.shape) < 3:
imaging_weights = da.broadcast_to(
imaging_weights[:, None, :],
data.shape,
chunks=data.chunks)
weightsxx = imaging_weights[:, :, 0] * weights[:, :, 0]
weightsyy = imaging_weights[:, :, -1] * weights[:, :, -1]
else:
weightsxx = weights[:, :, 0]
weightsyy = weights[:, :, -1]
# apply adjoint of mueller term.
# Phases modify data amplitudes modify weights.
if self.mueller_column is not None:
mueller = getattr(ds, self.mueller_column).data
dataxx *= da.exp(-1j * da.angle(mueller[:, :, 0]))
datayy *= da.exp(-1j * da.angle(mueller[:, :, -1]))
weightsxx *= da.absolute(mueller[:, :, 0])
weightsyy *= da.absolute(mueller[:, :, -1])
# weighted sum corr to Stokes I
weights = weightsxx + weightsyy
data = (weightsxx * dataxx + weightsyy * datayy)
# TODO - turn off this stupid warning
data = da.where(weights, data / weights, 0.0j)
# only keep data where both corrs are unflagged
flag = getattr(ds, self.flag_column).data
flagxx = flag[:, :, 0]
flagyy = flag[:, :, -1]
# ducc0 convention uses uint8 mask not flag
flag = ~(flagxx | flagyy)
dirty = vis2im(uvw,
freq,
data,
freq_bin_idx,
freq_bin_counts,
self.nx,
self.ny,
self.cell,
weights=weights,
flag=flag.astype(np.uint8),
nthreads=self.nthreads,
epsilon=self.epsilon,
do_wstacking=self.do_wstacking,
double_accum=True)
dirties.append(dirty)
dirties = dask.compute(dirties, scheduler='single-threaded')[0]
return accumulate_dirty(dirties, self.nband,
self.band_mapping).astype(self.real_type)
nx=2 * args.npix)
# Should only be one correlation
assert psf.shape[2] == 1, psf.shape
# FFT the PSF
psf_fft = da.fft.fftshift(da.fft.ifft2(da.fft.ifftshift(psf[:, :, 0])))
# Dirty image composed of the diagonal correlations
if ncorr == 1:
dirty = dirty_fft[0].real
else:
dirty = (dirty_fft[0].real + dirty_fft[ncorr - 1].real) * 0.5
# Normalised Amplitude
psf = da.absolute(psf_fft.real)
psf = (psf / da.max(psf))
# Scale the dirty image by the psf
# x4 because the N**2 FFT normalization factor
# on a square image double the size
dirty = dirty / (da.max(psf) * 4.)
# Visualise profiling if we have bokeh
try:
import bokeh # noqa
except ImportError:
from dask.diagnostics import ProgressBar
with ProgressBar():
dirty = dirty.compute()
def model_flux_per_scan_dask(time_chunks,
freq_chunks,
fluxcols,
w,
f,
filename="M1",
outdir="./soln-intervals",
indices=None):
"""compute the flux per interval scans"""
if len(fluxcols) == 1:
m0 = getattr(xds[0], fluxcols[0]).data
__sub_model = False
else:
m1 = getattr(xds[0], fluxcols[0]).data
m0 = getattr(xds[0], fluxcols[1]).data
__sub_model = True
# apply flags and weights
m0 *= (f == False)
m0 *= w
if __sub_model:
# p*=(f==False) select based on m only
m1 *= w
LOGGER.debug("Done applying weights and flags")
if indices is None:
nt, nv = len(time_chunks), len(freq_chunks)
flux = np.zeros((nt, nv))
for tt, time_chunk in enumerate(time_chunks):
for ff, freq_chunk in enumerate(freq_chunks):
tsel = slice(time_chunk[0], time_chunk[1])
fsel = slice(freq_chunk[0], freq_chunk[1])
if __sub_model:
model_abs = da.absolute(m1[tsel, fsel, :][..., [0, 3]][m0[
tsel, fsel, :][..., [0, 3]] != 0] - m0[tsel, fsel, :][
..., [0, 3]][m0[tsel, fsel, :][..., [0, 3]] != 0])
else:
model_abs = da.absolute(
m0[tsel,
fsel, :][...,
[0, 3]][m0[tsel, fsel, :][...,
[0, 3]] != 0])
with warnings.catch_warnings():
warnings.simplefilter("ignore", category=RuntimeWarning)
flux[tt, ff] = np.mean(model_abs.compute())
if tt % 6 == 0:
LOGGER.info(
"Done computing model flux for {%d}/{%d} time chunks" %
(tt + 1, len(time_chunks)))
LOGGER.info("Done computing model flux")
np.save(outdir + "/" + filename + "flux.npy", flux)
return flux
else:
flux = np.zeros(len(indices))
for loc, index in enumerate(indices):
tsel = slice(time_chunks[index[0]][0], time_chunks[index[0]][1])
fsel = slice(freq_chunks[index[1]][0], freq_chunks[index[1]][1])
if __sub_model:
model_abs = da.absolute(m1[tsel, fsel, :][..., [0, 3]][
m0[tsel, fsel, :][..., [0, 3]] != 0] - m0[tsel, fsel, :][
..., [0, 3]][m0[tsel, fsel, :][..., [0, 3]] != 0])
else:
model_abs = da.absolute(
m0[tsel,
fsel, :][...,
[0, 3]][m0[tsel, fsel, :][..., [0, 3]] != 0])
with warnings.catch_warnings():
warnings.simplefilter("ignore", category=RuntimeWarning)
flux[loc] = np.mean(model_abs.compute())
LOGGER.info("Done computing model flux")
return flux
def visualize(xda, axis=None, tsize=250):
"""
Plot a preview of any xarray DataArray contents
Parameters
----------
xda : xarray.core.dataarray.DataArray
input DataArray
axis : str or list
DataArray coordinate(s) to plot against data. Default None uses range
tsize : int
target size of the preview plot (might be smaller). Default is 250 points per axis
Returns
-------
Open matplotlib window
"""
import matplotlib.pyplot as plt
import xarray
import numpy as np
import dask.array as da
from pandas.plotting import register_matplotlib_converters
register_matplotlib_converters()
fig, axes = plt.subplots(1, 1)
# fast decimate to roughly the desired size
thinf = np.ceil(np.array(xda.shape) / tsize)
txda = xda.thin(
dict([(xda.dims[ii], int(thinf[ii])) for ii in range(len(thinf))]))
# can't plot complex numbers, bools (sometimes), or strings
if txda.dtype == 'complex128':
txda = da.absolute(txda)
elif txda.dtype == 'bool':
txda = txda.astype(int)
elif txda.dtype.type is np.str_:
txda = xarray.DataArray(np.unique(txda, return_inverse=True)[1],
dims=txda.dims,
coords=txda.coords,
name=txda.name)
# default pcolormesh plot axes
if (txda.ndim > 1) and (axis is None):
axis = np.array(txda.dims[:2])
if 'chan' in txda.dims: axis[-1] = 'chan'
# collapse data to 1-D or 2-D
if axis is not None:
axis = np.atleast_1d(axis)
if txda.ndim > 1:
txda = txda.max(dim=[dd for dd in txda.dims if dd not in axis])
# different types of plots depending on shape and parameters
if (txda.ndim == 1) and (axis is None):
dname = txda.name if txda.name is not None else 'value'
pxda = xarray.DataArray(np.arange(len(txda)),
dims=[dname],
coords={dname: txda.values})
pxda.plot.line(ax=axes, y=pxda.dims[0], marker='.', linewidth=0.0)
plt.title(dname)
elif (txda.ndim == 1):
txda.plot.line(ax=axes, x=axis[0], marker='.', linewidth=0.0)
if txda.name is not None: plt.title(txda.name + ' vs ' + axis[0])
else: # more than 1-D
txda.plot.pcolormesh(ax=axes, x=axis[0], y=axis[1])
plt.title(txda.name + ' ' + axis[1] + ' vs ' + axis[0])
plt.show()
def _residual(ms, stack, **kw):
args = OmegaConf.create(kw)
OmegaConf.set_struct(args, True)
pyscilog.log_to_file(args.output_filename + '.log')
pyscilog.enable_memory_logging(level=3)
# number of threads per worker
if args.nthreads is None:
if args.host_address is not None:
raise ValueError(
"You have to specify nthreads when using a distributed scheduler"
)
import multiprocessing
nthreads = multiprocessing.cpu_count()
args.nthreads = nthreads
else:
nthreads = args.nthreads
# configure memory limit
if args.mem_limit is None:
if args.host_address is not None:
raise ValueError(
"You have to specify mem-limit when using a distributed scheduler"
)
import psutil
mem_limit = int(psutil.virtual_memory()[0] /
1e9) # 100% of memory by default
args.mem_limit = mem_limit
else:
mem_limit = args.mem_limit
nband = args.nband
if args.nworkers is None:
nworkers = nband
args.nworkers = nworkers
else:
nworkers = args.nworkers
if args.nthreads_per_worker is None:
nthreads_per_worker = 1
args.nthreads_per_worker = nthreads_per_worker
else:
nthreads_per_worker = args.nthreads_per_worker
# the number of chunks being read in simultaneously is equal to
# the number of dask threads
nthreads_dask = nworkers * nthreads_per_worker
if args.ngridder_threads is None:
if args.host_address is not None:
ngridder_threads = nthreads // nthreads_per_worker
else:
ngridder_threads = nthreads // nthreads_dask
args.ngridder_threads = ngridder_threads
else:
ngridder_threads = args.ngridder_threads
ms = list(ms)
print('Input Options:', file=log)
for key in kw.keys():
print(' %25s = %s' % (key, args[key]), file=log)
# numpy imports have to happen after this step
from pfb import set_client
set_client(nthreads, mem_limit, nworkers, nthreads_per_worker,
args.host_address, stack, log)
import numpy as np
from pfb.utils.misc import chan_to_band_mapping
import dask
from dask.graph_manipulation import clone
from dask.distributed import performance_report
from daskms import xds_from_storage_ms as xds_from_ms
from daskms import xds_from_storage_table as xds_from_table
import dask.array as da
from africanus.constants import c as lightspeed
from africanus.gridding.wgridder.dask import residual as im2residim
from ducc0.fft import good_size
from pfb.utils.misc import stitch_images, plan_row_chunk
from pfb.utils.fits import set_wcs, save_fits
# chan <-> band mapping
freqs, freq_bin_idx, freq_bin_counts, freq_out, band_mapping, chan_chunks = chan_to_band_mapping(
ms, nband=nband)
# gridder memory budget
max_chan_chunk = 0
max_freq = 0
for ims in ms:
for spw in freqs[ims]:
counts = freq_bin_counts[ims][spw].compute()
freq = freqs[ims][spw].compute()
max_chan_chunk = np.maximum(max_chan_chunk, counts.max())
max_freq = np.maximum(max_freq, freq.max())
# assumes measurement sets have the same columns,
# number of correlations etc.
xds = xds_from_ms(ms[0])
ncorr = xds[0].dims['corr']
nrow = xds[0].dims['row']
data_bytes = getattr(xds[0], args.data_column).data.itemsize
bytes_per_row = max_chan_chunk * ncorr * data_bytes
memory_per_row = bytes_per_row
# real valued weights
wdims = getattr(xds[0], args.weight_column).data.ndim
if wdims == 2: # WEIGHT
memory_per_row += ncorr * data_bytes / 2
else: # WEIGHT_SPECTRUM
memory_per_row += bytes_per_row / 2
# flags (uint8 or bool)
memory_per_row += np.dtype(np.uint8).itemsize * max_chan_chunk * ncorr
# UVW
memory_per_row += xds[0].UVW.data.itemsize * 3
# ANTENNA1/2
memory_per_row += xds[0].ANTENNA1.data.itemsize * 2
columns = (args.data_column, args.weight_column, args.flag_column, 'UVW',
'ANTENNA1', 'ANTENNA2')
# flag row
if 'FLAG_ROW' in xds[0]:
columns += ('FLAG_ROW', )
memory_per_row += xds[0].FLAG_ROW.data.itemsize
# imaging weights
if args.imaging_weight_column is not None:
columns += (args.imaging_weight_column, )
memory_per_row += bytes_per_row / 2
# Mueller term (complex valued)
if args.mueller_column is not None:
columns += (args.mueller_column, )
memory_per_row += bytes_per_row
# get max uv coords over all fields
uvw = []
u_max = 0.0
v_max = 0.0
for ims in ms:
xds = xds_from_ms(ims, columns=('UVW'), chunks={'row': -1})
for ds in xds:
uvw = ds.UVW.data
u_max = da.maximum(u_max, abs(uvw[:, 0]).max())
v_max = da.maximum(v_max, abs(uvw[:, 1]).max())
uv_max = da.maximum(u_max, v_max)
uv_max = uv_max.compute()
del uvw
# image size
cell_N = 1.0 / (2 * uv_max * max_freq / lightspeed)
if args.cell_size is not None:
cell_size = args.cell_size
cell_rad = cell_size * np.pi / 60 / 60 / 180
if cell_N / cell_rad < 1:
raise ValueError(
"Requested cell size too small. "
"Super resolution factor = ", cell_N / cell_rad)
print("Super resolution factor = %f" % (cell_N / cell_rad), file=log)
else:
cell_rad = cell_N / args.super_resolution_factor
cell_size = cell_rad * 60 * 60 * 180 / np.pi
print("Cell size set to %5.5e arcseconds" % cell_size, file=log)
if args.nx is None:
fov = args.field_of_view * 3600
npix = int(fov / cell_size)
if npix % 2:
npix += 1
nx = good_size(npix)
ny = good_size(npix)
else:
nx = args.nx
ny = args.ny if args.ny is not None else nx
print("Image size set to (%i, %i, %i)" % (nband, nx, ny), file=log)
# get approx image size
# this is not a conservative estimate when multiple SPW's map to a single
# imaging band
pixel_bytes = np.dtype(args.output_type).itemsize
band_size = nx * ny * pixel_bytes
if args.host_address is None:
# full image on single node
row_chunk = plan_row_chunk(mem_limit / nworkers, band_size, nrow,
memory_per_row, nthreads_per_worker)
else:
# single band per node
row_chunk = plan_row_chunk(mem_limit, band_size, nrow, memory_per_row,
nthreads_per_worker)
if args.row_chunks is not None:
row_chunk = int(args.row_chunks)
if row_chunk == -1:
row_chunk = nrow
print(
"nrows = %i, row chunks set to %i for a total of %i chunks per node" %
(nrow, row_chunk, int(np.ceil(nrow / row_chunk))),
file=log)
chunks = {}
for ims in ms:
chunks[ims] = [] # xds_from_ms expects a list per ds
for spw in freqs[ims]:
chunks[ims].append({
'row': row_chunk,
'chan': chan_chunks[ims][spw]['chan']
})
dirties = []
radec = None # assumes we are only imaging field 0 of first MS
for ims in ms:
xds = xds_from_ms(ims, chunks=chunks[ims], columns=columns)
# subtables
ddids = xds_from_table(ims + "::DATA_DESCRIPTION")
fields = xds_from_table(ims + "::FIELD")
spws = xds_from_table(ims + "::SPECTRAL_WINDOW")
pols = xds_from_table(ims + "::POLARIZATION")
# subtable data
ddids = dask.compute(ddids)[0]
fields = dask.compute(fields)[0]
spws = dask.compute(spws)[0]
pols = dask.compute(pols)[0]
for ds in xds:
field = fields[ds.FIELD_ID]
# check fields match
if radec is None:
radec = field.PHASE_DIR.data.squeeze()
if not np.array_equal(radec, field.PHASE_DIR.data.squeeze()):
continue
# this is not correct, need to use spw
spw = ds.DATA_DESC_ID
uvw = clone(ds.UVW.data)
data = getattr(ds, args.data_column).data
dataxx = data[:, :, 0]
datayy = data[:, :, -1]
weights = getattr(ds, args.weight_column).data
if len(weights.shape) < 3:
weights = da.broadcast_to(weights[:, None, :],
data.shape,
chunks=data.chunks)
if args.imaging_weight_column is not None:
imaging_weights = getattr(ds, args.imaging_weight_column).data
if len(imaging_weights.shape) < 3:
imaging_weights = da.broadcast_to(imaging_weights[:,
None, :],
data.shape,
chunks=data.chunks)
weightsxx = imaging_weights[:, :, 0] * weights[:, :, 0]
weightsyy = imaging_weights[:, :, -1] * weights[:, :, -1]
else:
weightsxx = weights[:, :, 0]
weightsyy = weights[:, :, -1]
# apply adjoint of mueller term.
# Phases modify data amplitudes modify weights.
if args.mueller_column is not None:
mueller = getattr(ds, args.mueller_column).data
dataxx *= da.exp(-1j * da.angle(mueller[:, :, 0]))
datayy *= da.exp(-1j * da.angle(mueller[:, :, -1]))
weightsxx *= da.absolute(mueller[:, :, 0])
weightsyy *= da.absolute(mueller[:, :, -1])
# weighted sum corr to Stokes I
weights = weightsxx + weightsyy
data = (weightsxx * dataxx + weightsyy * datayy)
# TODO - turn off this stupid warning
data = da.where(weights, data / weights, 0.0j)
# MS may contain auto-correlations
if 'FLAG_ROW' in xds[0]:
frow = ds.FLAG_ROW.data | (ds.ANTENNA1.data
== ds.ANTENNA2.data)
else:
frow = (ds.ANTENNA1.data == ds.ANTENNA2.data)
# only keep data where both corrs are unflagged
flag = getattr(ds, args.flag_column).data
flagxx = flag[:, :, 0]
flagyy = flag[:, :, -1]
# ducc0 uses uint8 mask not flag
mask = ~da.logical_or((flagxx | flagyy), frow[:, None])
dirty = vis2im(uvw,
freqs[ims][spw],
data,
freq_bin_idx[ims][spw],
freq_bin_counts[ims][spw],
nx,
ny,
cell_rad,
weights=weights,
flag=mask.astype(np.uint8),
nthreads=ngridder_threads,
epsilon=args.epsilon,
do_wstacking=args.wstack,
double_accum=args.double_accum)
dirties.append(dirty)
# dask.visualize(dirties, filename=args.output_filename + '_graph.pdf', optimize_graph=False)
if not args.mock:
# result = dask.compute(dirties, wsum, optimize_graph=False)
with performance_report(filename=args.output_filename + '_per.html'):
result = dask.compute(dirties, optimize_graph=False)
dirties = result[0]
dirty = stitch_images(dirties, nband, band_mapping)
hdr = set_wcs(cell_size / 3600, cell_size / 3600, nx, ny, radec,
freq_out)
save_fits(args.output_filename + '_dirty.fits',
dirty,
hdr,
dtype=args.output_type)
print("All done here.", file=log)
def _psf(**kw):
args = OmegaConf.create(kw)
from omegaconf import ListConfig
if not isinstance(args.ms, list) and not isinstance(args.ms, ListConfig):
args.ms = [args.ms]
OmegaConf.set_struct(args, True)
import numpy as np
from pfb.utils.misc import chan_to_band_mapping
import dask
# from dask.distributed import performance_report
from dask.graph_manipulation import clone
from daskms import xds_from_storage_ms as xds_from_ms
from daskms import xds_from_storage_table as xds_from_table
from daskms import Dataset
from daskms.experimental.zarr import xds_to_zarr
import dask.array as da
from africanus.constants import c as lightspeed
from africanus.gridding.wgridder.dask import dirty as vis2im
from ducc0.fft import good_size
from pfb.utils.misc import stitch_images, plan_row_chunk
from pfb.utils.fits import set_wcs, save_fits
# chan <-> band mapping
ms = args.ms
nband = args.nband
freqs, freq_bin_idx, freq_bin_counts, freq_out, band_mapping, chan_chunks = chan_to_band_mapping(
ms, nband=nband)
# gridder memory budget
max_chan_chunk = 0
max_freq = 0
for ims in args.ms:
for spw in freqs[ims]:
counts = freq_bin_counts[ims][spw].compute()
freq = freqs[ims][spw].compute()
max_chan_chunk = np.maximum(max_chan_chunk, counts.max())
max_freq = np.maximum(max_freq, freq.max())
# assumes measurement sets have the same columns,
# number of correlations etc.
xds = xds_from_ms(args.ms[0])
ncorr = xds[0].dims['corr']
nrow = xds[0].dims['row']
# we still have to cater for complex valued data because we cast
# the weights to complex but we not longer need to factor the
# weight column into our memory budget
data_bytes = getattr(xds[0], args.data_column).data.itemsize
bytes_per_row = max_chan_chunk * ncorr * data_bytes
memory_per_row = bytes_per_row
# flags (uint8 or bool)
memory_per_row += bytes_per_row / 8
# UVW
memory_per_row += xds[0].UVW.data.itemsize * 3
# ANTENNA1/2
memory_per_row += xds[0].ANTENNA1.data.itemsize * 2
# TIME
memory_per_row += xds[0].TIME.data.itemsize
# data column is not actually read into memory just used to infer
# dtype and chunking
columns = (args.data_column, args.weight_column, args.flag_column, 'UVW',
'ANTENNA1', 'ANTENNA2', 'TIME')
# flag row
if 'FLAG_ROW' in xds[0]:
columns += ('FLAG_ROW', )
memory_per_row += xds[0].FLAG_ROW.data.itemsize
# imaging weights
if args.imaging_weight_column is not None:
columns += (args.imaging_weight_column, )
memory_per_row += bytes_per_row / 2
# Mueller term (complex valued)
if args.mueller_column is not None:
columns += (args.mueller_column, )
memory_per_row += bytes_per_row
# get max uv coords over all fields
uvw = []
u_max = 0.0
v_max = 0.0
for ims in args.ms:
xds = xds_from_ms(ims, columns=('UVW'), chunks={'row': -1})
for ds in xds:
uvw = ds.UVW.data
u_max = da.maximum(u_max, abs(uvw[:, 0]).max())
v_max = da.maximum(v_max, abs(uvw[:, 1]).max())
uv_max = da.maximum(u_max, v_max)
uv_max = uv_max.compute()
del uvw
# image size
cell_N = 1.0 / (2 * uv_max * max_freq / lightspeed)
if args.cell_size is not None:
cell_size = args.cell_size
cell_rad = cell_size * np.pi / 60 / 60 / 180
if cell_N / cell_rad < 1:
raise ValueError(
"Requested cell size too small. "
"Super resolution factor = ", cell_N / cell_rad)
print("Super resolution factor = %f" % (cell_N / cell_rad), file=log)
else:
cell_rad = cell_N / args.super_resolution_factor
cell_size = cell_rad * 60 * 60 * 180 / np.pi
print("Cell size set to %5.5e arcseconds" % cell_size, file=log)
if args.nx is None:
fov = args.field_of_view * 3600
npix = int(args.psf_oversize * fov / cell_size)
if npix % 2:
npix += 1
nx = npix
ny = npix
else:
nx = args.nx
ny = args.ny if args.ny is not None else nx
print("PSF size set to (%i, %i, %i)" % (nband, nx, ny), file=log)
# get approx image size
# this is not a conservative estimate when multiple SPW's map to a single
# imaging band
pixel_bytes = np.dtype(args.output_type).itemsize
band_size = nx * ny * pixel_bytes
if args.host_address is None:
# full image on single node
row_chunk = plan_row_chunk(args.mem_limit / args.nworkers, band_size,
nrow, memory_per_row,
args.nthreads_per_worker)
else:
# single band per node
row_chunk = plan_row_chunk(args.mem_limit, band_size, nrow,
memory_per_row, args.nthreads_per_worker)
if args.row_chunks is not None:
row_chunk = int(args.row_chunks)
if row_chunk == -1:
row_chunk = nrow
print(
"nrows = %i, row chunks set to %i for a total of %i chunks per node" %
(nrow, row_chunk, int(np.ceil(nrow / row_chunk))),
file=log)
chunks = {}
for ims in args.ms:
chunks[ims] = [] # xds_from_ms expects a list per ds
for spw in freqs[ims]:
chunks[ims].append({
'row': row_chunk,
'chan': chan_chunks[ims][spw]['chan']
})
psfs = []
radec = None # assumes we are only imaging field 0 of first MS
out_datasets = []
for ims in args.ms:
xds = xds_from_ms(ims, chunks=chunks[ims], columns=columns)
# subtables
ddids = xds_from_table(ims + "::DATA_DESCRIPTION")
fields = xds_from_table(ims + "::FIELD")
spws = xds_from_table(ims + "::SPECTRAL_WINDOW")
pols = xds_from_table(ims + "::POLARIZATION")
# subtable data
ddids = dask.compute(ddids)[0]
fields = dask.compute(fields)[0]
spws = dask.compute(spws)[0]
pols = dask.compute(pols)[0]
for ds in xds:
field = fields[ds.FIELD_ID]
# check fields match
if radec is None:
radec = field.PHASE_DIR.data.squeeze()
if not np.array_equal(radec, field.PHASE_DIR.data.squeeze()):
continue
# this is not correct, need to use spw
spw = ds.DATA_DESC_ID
uvw = clone(ds.UVW.data)
data_type = getattr(ds, args.data_column).data.dtype
data_shape = getattr(ds, args.data_column).data.shape
data_chunks = getattr(ds, args.data_column).data.chunks
weights = getattr(ds, args.weight_column).data
if len(weights.shape) < 3:
weights = da.broadcast_to(weights[:, None, :],
data_shape,
chunks=data_chunks)
if args.imaging_weight_column is not None:
imaging_weights = getattr(ds, args.imaging_weight_column).data
if len(imaging_weights.shape) < 3:
imaging_weights = da.broadcast_to(imaging_weights[:,
None, :],
data_shape,
chunks=data_chunks)
weightsxx = imaging_weights[:, :, 0] * weights[:, :, 0]
weightsyy = imaging_weights[:, :, -1] * weights[:, :, -1]
else:
weightsxx = weights[:, :, 0]
weightsyy = weights[:, :, -1]
# apply mueller term
if args.mueller_column is not None:
mueller = getattr(ds, args.mueller_column).data
weightsxx *= da.absolute(mueller[:, :, 0])**2
weightsyy *= da.absolute(mueller[:, :, -1])**2
# weighted sum corr to Stokes I
weights = weightsxx + weightsyy
# MS may contain auto-correlations
if 'FLAG_ROW' in xds[0]:
frow = ds.FLAG_ROW.data | (ds.ANTENNA1.data
== ds.ANTENNA2.data)
else:
frow = (ds.ANTENNA1.data == ds.ANTENNA2.data)
# only keep data where both corrs are unflagged
flag = getattr(ds, args.flag_column).data
flagxx = flag[:, :, 0]
flagyy = flag[:, :, -1]
# ducc0 uses uint8 mask not flag
mask = ~da.logical_or((flagxx | flagyy), frow[:, None])
psf = vis2im(uvw,
freqs[ims][spw],
weights.astype(data_type),
freq_bin_idx[ims][spw],
freq_bin_counts[ims][spw],
nx,
ny,
cell_rad,
flag=mask.astype(np.uint8),
nthreads=args.nvthreads,
epsilon=args.epsilon,
do_wstacking=args.wstack,
double_accum=args.double_accum)
psfs.append(psf)
data_vars = {
'FIELD_ID': (('row', ),
da.full_like(ds.TIME.data,
ds.FIELD_ID,
chunks=args.row_out_chunk)),
'DATA_DESC_ID': (('row', ),
da.full_like(ds.TIME.data,
ds.DATA_DESC_ID,
chunks=args.row_out_chunk)),
'WEIGHT':
(('row', 'chan'), weights.rechunk({0: args.row_out_chunk
})), # why no 'f4'?
'UVW': (('row', 'uvw'), uvw.rechunk({0: args.row_out_chunk}))
}
coords = {'chan': (('chan', ), freqs[ims][spw])}
out_ds = Dataset(data_vars, coords)
out_datasets.append(out_ds)
writes = xds_to_zarr(out_datasets,
args.output_filename + '.zarr',
columns='ALL')
# dask.visualize(writes, filename=args.output_filename + '_psf_writes_graph.pdf', optimize_graph=False)
# dask.visualize(psfs, filename=args.output_filename + '_psf_graph.pdf', optimize_graph=False)
if not args.mock:
# psfs = dask.compute(psfs, writes, optimize_graph=False)[0]
# with performance_report(filename=args.output_filename + '_psf_per.html'):
psfs = dask.compute(psfs, writes, optimize_graph=False)[0]
psf = stitch_images(psfs, nband, band_mapping)
hdr = set_wcs(cell_size / 3600, cell_size / 3600, nx, ny, radec,
freq_out)
save_fits(args.output_filename + '_psf.fits',
psf,
hdr,
dtype=args.output_type)
psf_mfs = np.sum(psf, axis=0)
wsum = psf_mfs.max()
psf_mfs /= wsum
hdr_mfs = set_wcs(cell_size / 3600, cell_size / 3600, nx, ny, radec,
np.mean(freq_out))
save_fits(args.output_filename + '_psf_mfs.fits',
psf_mfs,
hdr_mfs,
dtype=args.output_type)
print("All done here.", file=log)
def plot_wavelet_spectrogram(s, f, t, *, kind='amplitude', freq_limits=None, time_limits=None,
zscore=False, zscore_axis=None, n_workers=cpu_count(),
timescale='seconds', relative_time=False, center_time=False,
colorbar=True, plot_type='pcolormesh', fig=None,
ax=None, **kwargs):
"""
Plot a wavelet based spectrogram. Note that the spectrogram
data need not fit into memory but the data used for the
plot should.
Parameters
----------
s : np.ndarray, with shape (n_freqs, n_timepoints)
The spectrogram. Should be real-valued.
f : np.ndarray, with shape (n_freqs, )
Spectrogram frequencies in Hz. Must be uniformly
spaced and strictly increasing or strictly
decreasing.
t : np.ndarray, with shape (n_timepoints, )
Midpoints of each spectrogram time window in seconds.
Must be uniformly spaced and strictly increasing
or strictly decreasing.
kind : {'amplitude', 'power'}, optional
Display the data using the wavelet coefficient amplitudes
or power, depending on what 'kind' is.
Default is 'amplitude'.
freq_limits : list or None, optional
If not None, a list consisting of the half-open interval
[min_frequency, max_frequency) to show in the plot.
Note that these are only approximate since the data may
not contain those exact frequencies. However, the
plot is guaranteed not to show anything < min_frequency or
>= max_frequency.
Default is None, where all frequencies are shown.
time_limits : list or None, optional
If not None, a list consisting of the half-interval
[min_time, max_time) to show in the plot. Note that these
are only approximate since the data may not contain those
exact time values. However, the plot is guaranteed not to
show anything < min_time or >= max_time.
Default is None, where all time points are shown.
zscore : boolean, optional
Whether to zscore the data before visualizing. zscoring
is applied before restricting the display according to
'freq_limits' and 'time_limits'
zscore axis : None or int, optional
The axis of s over which to apply zscoring. If None, zscoring
is applied over the entire array s.
Default is None.
n_workers : integer, optional
Number of parallel computations. Only used if 'zscore' is True.
Default is the total number of CPUs (which may be virtual).
timescale : string, optional
The time scale to use on the plot's x-axis. Can be
'milliseconds', seconds', 'minutes', or 'hours'.
Default is 'seconds'
relative_time : boolean, optional
Whether the time axis shown on the plot will be relative
Default is False
center_time : boolean, optional
Whether the time axis is centered around 0. This option
is only available if 'relative_time' is set to True
Default is False
colorbar : boolean, optional
Whether to show colorbar or not.
Default is True.
plot_type : {'pcolormesh', 'contourf', 'quadmesh'}, optional
Type of plot to show. Note that the 'quadmesh' option uses
hvplot as the backend.
Default is 'pcolormesh'
fig : matplotlib figure
Used if 'colorbar' is True and 'plot_type' is not 'quadmesh'
ax : matplotlib axes
If None, new axes will be generated. Note that this argument
is ignored if plot_type=='quadmesh'
**kwargs: optional
Other keyword arguments. Passed directly to pcolormesh(),
contourf(), or quadmesh().
Returns
-------
If plot_type is 'pcolormesh' or 'contourf':
fig, ax : tuple consisting of (matplotlib figure, matplotlib axes)
Otherwise:
plot : bokeh plot handle
"""
if not np.iscomplexobj(s):
raise TypeError("Expected input data to be complex")
if kind == 'amplitude':
title_str = "Amplitude"
elif kind == 'power':
title_str = "Power"
if freq_limits is not None:
freq_slices = _get_frequency_slices(f, freq_limits[0], freq_limits[1])
else:
freq_slices = slice(None, None, None)
if time_limits is not None:
time_slices = _get_time_slices(t, time_limits[0], time_limites[1])
else:
time_slices = slice(None, None, None)
tvec = t[time_slices]
if timescale == 'milliseconds':
tvec = tvec * 1000
xlabel = "Time (msec)"
elif timescale == 'seconds':
xlabel = "Time (sec)"
elif timescale == 'minutes':
tvec = tvec / 60
xlabel = "Time (min)"
else:
tvec = tvec / 3600
xlabel = "Time (hr)"
if relative_time:
tvec = tvec - tvec[0]
if center_time:
a = (tvec[0] + tvec[-1]) / 2
tvec = tvec - a
fvec = f[freq_slices]
if zscore:
# data may be large. use dask for computation
dask_data = da.absolute(da.from_array(s))
if kind == 'power':
dask_data = da.square(dask_data)
if zscore_axis is None:
dask_data = (dask_data - dask_data.mean()) / dask_data.std()
else:
dask_data = (
(dask_data - dask_data.mean(axis=zscore_axis, keepdims=True)) /
dask_data.std(axis=zscore_axis, keepdims=True)
)
data = dask_data[freq_slices, time_slices].compute(num_workers=n_workers)
else:
data = np.abs(s[freq_slices, time_slices])
if kind == 'power':
data = data**2
if ax is None and plot_type != 'quadmesh':
fig, ax = plt.subplots(1, 1)
if colorbar:
if (fig is None and ax is not None) or (fig is not None and ax is None):
raise ValueError(
"Both 'fig' and 'ax' must be passed in if either is specified")
if plot_type == 'pcolormesh':
_set_matplotlib(True)
im = ax.pcolormesh(tvec, fvec, data, **kwargs)
if colorbar:
fig.colorbar(im, ax=ax)
ax.set_title(title_str)
ax.set_xlabel(xlabel)
ax.set_ylabel("Frequency")
return fig, ax
elif plot_type == 'contourf':
_set_matplotlib(True)
im = ax.contourf(tvec, fvec, data, **kwargs)
if colorbar:
fig.colorbar(im, ax=ax)
ax.set_title(title_str)
ax.set_xlabel(xlabel)
ax.set_ylabel("Frequency")
return fig, ax
elif plot_type == 'quadmesh':
_set_matplotlib(False)
xa = xr.DataArray(
data,
dims=['Frequency', xlabel],
coords={'Frequency':fvec, xlabel:tvec})
plot = xa.hvplot.quadmesh(
x=xlabel, y='Frequency', title=title_str,
colorbar=colorbar, **kwargs)
return plot
def wiener(data, aux, fr, L):
l_del = delayed(L)
return uirdft2((da.conj(delayed(fr)) * urdft2(data) + l_del * urdft2(aux)) * ((da.absolute(fr_npy)**2 + l_del)**-1))
