def deconvolve_channel_list_serial_workflow(dirty_list, psf_list,
model_imagelist, subimages,
**kwargs):
"""Create a graph for deconvolution by channels, adding to the model
Does deconvolution channel by channel.
:param subimages:
:param dirty_list:
:param psf_list: Must be the size of a facet
:param model_imagelist: Current model
:param kwargs: Parameters for functions in components
:return:
"""
def deconvolve_subimage(dirty, psf):
assert isinstance(dirty, Image)
assert isinstance(psf, Image)
comp = deconvolve_cube(dirty, psf, **kwargs)
return comp[0]
def add_model(sum_model, model):
assert isinstance(output, Image)
assert isinstance(model, Image)
sum_model.data += model.data
return sum_model
output = create_empty_image_like(model_imagelist)
dirty_lists = image_scatter_channels(dirty_list[0], subimages=subimages)
results = [
deconvolve_subimage(dirty_list, psf_list[0])
for dirty_list in dirty_lists
]
result = image_gather_channels(results, output, subimages=subimages)
return add_model(result, model_imagelist)
def test_gather_channel(self):
for nchan in [128, 16]:
m31cube = create_test_image(polarisation_frame=PolarisationFrame('stokesI'),
frequency=numpy.linspace(1e8, 1.1e8, nchan))
image_list = image_scatter_channels(m31cube, subimages=nchan)
m31cuberec = image_gather_channels(image_list, None, subimages=nchan)
assert m31cube.shape == m31cuberec.shape
diff = m31cube.data - m31cuberec.data
assert numpy.max(numpy.abs(diff)) == 0.0, "Scatter gather failed for %d" % nchan
def deconvolve_list_serial_workflow(dirty_list,
psf_list,
model_imagelist,
prefix='',
**kwargs):
"""Create a graph for deconvolution, adding to the model
:param dirty_list:
:param psf_list:
:param model_imagelist:
:param kwargs: Parameters for functions in components
:return: (graph for the deconvolution, graph for the flat)
"""
nchan = len(dirty_list)
def deconvolve(dirty, psf, model, facet, gthreshold):
import time
starttime = time.time()
if prefix == '':
lprefix = "facet %d" % facet
else:
lprefix = "%s, facet %d" % (prefix, facet)
nmoments = get_parameter(kwargs, "nmoments", 0)
if nmoments > 0:
moment0 = calculate_image_frequency_moments(dirty)
this_peak = numpy.max(numpy.abs(
moment0.data[0, ...])) / dirty.data.shape[0]
else:
this_peak = numpy.max(numpy.abs(dirty.data[0, ...]))
if this_peak > 1.1 * gthreshold:
log.info(
"deconvolve_list_serial_workflow %s: cleaning - peak %.6f > 1.1 * threshold %.6f"
% (lprefix, this_peak, gthreshold))
kwargs['threshold'] = gthreshold
result, _ = deconvolve_cube(dirty, psf, prefix=lprefix, **kwargs)
if result.data.shape[0] == model.data.shape[0]:
result.data += model.data
else:
log.warning(
"deconvolve_list_serial_workflow %s: Initial model %s and clean result %s do not have the same shape"
% (lprefix, str(
model.data.shape[0]), str(result.data.shape[0])))
flux = numpy.sum(result.data[0, 0, ...])
log.info(
'### %s, %.6f, %.6f, True, %.3f # cycle, facet, peak, cleaned flux, clean, time?'
% (lprefix, this_peak, flux, time.time() - starttime))
return result
else:
log.info(
"deconvolve_list_serial_workflow %s: Not cleaning - peak %.6f <= 1.1 * threshold %.6f"
% (lprefix, this_peak, gthreshold))
log.info(
'### %s, %.6f, %.6f, False, %.3f # cycle, facet, peak, cleaned flux, clean, time?'
% (lprefix, this_peak, 0.0, time.time() - starttime))
return copy_image(model)
deconvolve_facets = get_parameter(kwargs, 'deconvolve_facets', 1)
deconvolve_overlap = get_parameter(kwargs, 'deconvolve_overlap', 0)
deconvolve_taper = get_parameter(kwargs, 'deconvolve_taper', None)
if deconvolve_overlap > 0:
deconvolve_number_facets = (deconvolve_facets - 2)**2
else:
deconvolve_number_facets = deconvolve_facets**2
model_imagelist = image_gather_channels(model_imagelist)
# Scatter the separate channel images into deconvolve facets and then gather channels for each facet.
# This avoids constructing the entire spectral cube.
# dirty_list = remove_sumwt, nout=nchan)(dirty_list)
scattered_channels_facets_dirty_list = \
[image_scatter_facets(d[0], facets=deconvolve_facets,
overlap=deconvolve_overlap,
taper=deconvolve_taper)
for d in dirty_list]
# Now we do a transpose and gather
scattered_facets_list = [
image_gather_channels([
scattered_channels_facets_dirty_list[chan][facet]
for chan in range(nchan)
]) for facet in range(deconvolve_number_facets)
]
psf_list = remove_sumwt(psf_list)
psf_list = image_gather_channels(psf_list)
scattered_model_imagelist = \
image_scatter_facets(model_imagelist,
facets=deconvolve_facets,
overlap=deconvolve_overlap)
# Work out the threshold. Need to find global peak over all dirty_list images
threshold = get_parameter(kwargs, "threshold", 0.0)
fractional_threshold = get_parameter(kwargs, "fractional_threshold", 0.1)
nmoments = get_parameter(kwargs, "nmoments", 0)
use_moment0 = nmoments > 0
# Find the global threshold. This uses the peak in the average on the frequency axis since we
# want to use it in a stopping criterion in a moment clean
global_threshold = threshold_list(scattered_facets_list,
threshold,
fractional_threshold,
use_moment0=use_moment0,
prefix=prefix)
facet_list = numpy.arange(deconvolve_number_facets).astype('int')
scattered_results_list = [
deconvolve(d, psf_list, m, facet, global_threshold) for d, m, facet in
zip(scattered_facets_list, scattered_model_imagelist, facet_list)
]
# Gather the results back into one image, correcting for overlaps as necessary. The taper function is is used to
# feather the facets together
gathered_results_list = image_gather_facets(scattered_results_list,
model_imagelist,
facets=deconvolve_facets,
overlap=deconvolve_overlap,
taper=deconvolve_taper)
flat_list = image_gather_facets(scattered_results_list,
model_imagelist,
facets=deconvolve_facets,
overlap=deconvolve_overlap,
taper=deconvolve_taper,
return_flat=True)
return image_scatter_channels(gathered_results_list,
subimages=nchan), flat_list