257 lines
8.4 KiB
Cython
257 lines
8.4 KiB
Cython
import numpy as np
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__all__ = ['legendre_transform', 'legendre_roots', 'sht', 'synthesis', 'adjoint_synthesis',
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'analysis', 'adjoint_analysis', 'healpix_grid', 'triangular_order', 'rectangular_order',
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'packed_real_order']
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def legendre_transform(x, bl, out=None):
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if out is None:
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out = np.empty_like(x)
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if out.shape[0] == 0:
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return out
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elif x.dtype == np.float64:
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if bl.dtype != np.float64:
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bl = bl.astype(np.float64)
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return _legendre_transform(x, bl, out=out)
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elif x.dtype == np.float32:
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if bl.dtype != np.float32:
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bl = bl.astype(np.float32)
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return _legendre_transform_s(x, bl, out=out)
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else:
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raise ValueError("unsupported dtype")
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def _legendre_transform(double[::1] x, double[::1] bl, double[::1] out):
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if out.shape[0] != x.shape[0]:
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raise ValueError('x and out must have same shape')
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sharp_legendre_transform(&bl[0], NULL, bl.shape[0] - 1, &x[0], &out[0], x.shape[0])
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return np.asarray(out)
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def _legendre_transform_s(float[::1] x, float[::1] bl, float[::1] out):
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if out.shape[0] != x.shape[0]:
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raise ValueError('x and out must have same shape')
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sharp_legendre_transform_s(&bl[0], NULL, bl.shape[0] - 1, &x[0], &out[0], x.shape[0])
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return np.asarray(out)
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def legendre_roots(n):
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x = np.empty(n, np.double)
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w = np.empty(n, np.double)
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cdef double[::1] x_buf = x, w_buf = w
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if not (x_buf.shape[0] == w_buf.shape[0] == n):
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raise AssertionError()
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if n > 0:
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sharp_legendre_roots(n, &x_buf[0], &w_buf[0])
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return x, w
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JOBTYPE_TO_CONST = {
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'Y': SHARP_Y,
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'Yt': SHARP_Yt,
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'WY': SHARP_WY,
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'YtW': SHARP_YtW
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}
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def sht(jobtype, geom_info ginfo, alm_info ainfo, double[:, :, ::1] input,
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int spin=0, comm=None, add=False):
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cdef void *comm_ptr
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cdef int flags = SHARP_DP | (SHARP_ADD if add else 0)
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cdef int r
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cdef sharp_jobtype jobtype_i
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cdef double[:, :, ::1] output_buf
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cdef int ntrans = input.shape[0] * input.shape[1]
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cdef int i, j
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if spin == 0 and input.shape[1] != 1:
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raise ValueError('For spin == 0, we need input.shape[1] == 1')
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elif spin != 0 and input.shape[1] != 2:
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raise ValueError('For spin != 0, we need input.shape[1] == 2')
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cdef size_t[::1] ptrbuf = np.empty(2 * ntrans, dtype=np.uintp)
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cdef double **alm_ptrs = <double**>&ptrbuf[0]
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cdef double **map_ptrs = <double**>&ptrbuf[ntrans]
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try:
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jobtype_i = JOBTYPE_TO_CONST[jobtype]
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except KeyError:
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raise ValueError('jobtype must be one of: %s' % ', '.join(sorted(JOBTYPE_TO_CONST.keys())))
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if jobtype_i == SHARP_Y or jobtype_i == SHARP_WY:
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output = np.empty((input.shape[0], input.shape[1], ginfo.local_size()), dtype=np.float64)
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output_buf = output
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for i in range(input.shape[0]):
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for j in range(input.shape[1]):
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alm_ptrs[i * input.shape[1] + j] = &input[i, j, 0]
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map_ptrs[i * input.shape[1] + j] = &output_buf[i, j, 0]
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else:
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output = np.empty((input.shape[0], input.shape[1], ainfo.local_size()), dtype=np.float64)
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output_buf = output
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for i in range(input.shape[0]):
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for j in range(input.shape[1]):
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alm_ptrs[i * input.shape[1] + j] = &output_buf[i, j, 0]
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map_ptrs[i * input.shape[1] + j] = &input[i, j, 0]
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if comm is None:
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with nogil:
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sharp_execute (
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jobtype_i,
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geom_info=ginfo.ginfo, alm_info=ainfo.ainfo,
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spin=spin, alm=alm_ptrs, map=map_ptrs,
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ntrans=ntrans, flags=flags, time=NULL, opcnt=NULL)
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else:
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from mpi4py import MPI
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if not isinstance(comm, MPI.Comm):
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raise TypeError('comm must be an mpi4py communicator')
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from .libsharp_mpi import _addressof
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comm_ptr = <void*><size_t>_addressof(comm)
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with nogil:
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r = sharp_execute_mpi_maybe (
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comm_ptr, jobtype_i,
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geom_info=ginfo.ginfo, alm_info=ainfo.ainfo,
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spin=spin, alm=alm_ptrs, map=map_ptrs,
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ntrans=ntrans, flags=flags, time=NULL, opcnt=NULL)
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if r == SHARP_ERROR_NO_MPI:
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raise Exception('MPI requested, but not available')
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return output
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def synthesis(*args, **kw):
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return sht('Y', *args, **kw)
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def adjoint_synthesis(*args, **kw):
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return sht('Yt', *args, **kw)
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def analysis(*args, **kw):
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return sht('YtW', *args, **kw)
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def adjoint_analysis(*args, **kw):
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return sht('WY', *args, **kw)
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#
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# geom_info
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#
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class NotInitializedError(Exception):
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pass
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cdef class geom_info:
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cdef sharp_geom_info *ginfo
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def __cinit__(self, *args, **kw):
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self.ginfo = NULL
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def local_size(self):
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if self.ginfo == NULL:
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raise NotInitializedError()
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return sharp_map_size(self.ginfo)
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def __dealloc__(self):
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if self.ginfo != NULL:
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sharp_destroy_geom_info(self.ginfo)
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self.ginfo = NULL
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cdef class healpix_grid(geom_info):
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_weight_cache = {} # { (nside, 'T'/'Q'/'U') -> numpy array of ring weights cached from file }
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def __init__(self, int nside, stride=1, int[::1] rings=None, double[::1] weights=None):
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if weights is not None and weights.shape[0] != 2 * nside:
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raise ValueError('weights must have length 2 * nside')
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sharp_make_subset_healpix_geom_info(nside, stride,
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nrings=4 * nside - 1 if rings is None else rings.shape[0],
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rings=NULL if rings is None else &rings[0],
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weight=NULL if weights is None else &weights[0],
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geom_info=&self.ginfo)
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@classmethod
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def load_ring_weights(cls, nside, fields):
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"""
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Loads HEALPix ring weights from file. The environment variable
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HEALPIX should be set, and this routine will look in the `data`
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subdirectory.
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Parameters
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----------
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nside: int
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HEALPix nside parameter
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fields: tuple of str
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Which weights to extract; pass ('T',) to only get scalar
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weights back, or ('T', 'Q', 'U') to get all the weights
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Returns
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-------
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List of NumPy arrays, according to fields parameter.
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"""
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import os
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from astropy.io import fits
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data_path = os.path.join(os.environ['HEALPIX'], 'data')
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fits_field_names = {
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'T': 'TEMPERATURE WEIGHTS',
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'Q': 'Q-POLARISATION WEIGHTS',
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'U': 'U-POLARISATION WEIGHTS'}
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must_load = [field for field in fields if (nside, field) not in cls._weight_cache]
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if must_load:
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hdulist = fits.open(os.path.join(data_path, 'weight_ring_n%05d.fits' % nside))
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try:
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for field in must_load:
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w = hdulist[1].data.field(fits_field_names[field]).ravel().astype(np.double)
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w += 1
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cls._weight_cache[nside, field] = w
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finally:
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hdulist.close()
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return [cls._weight_cache[(nside, field)].copy() for field in fields]
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#
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# alm_info
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#
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cdef class alm_info:
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cdef sharp_alm_info *ainfo
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def __cinit__(self, *args, **kw):
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self.ainfo = NULL
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def local_size(self):
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if self.ainfo == NULL:
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raise NotInitializedError()
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return sharp_alm_count(self.ainfo)
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def __dealloc__(self):
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if self.ainfo != NULL:
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sharp_destroy_alm_info(self.ainfo)
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self.ainfo = NULL
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cdef class triangular_order(alm_info):
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def __init__(self, int lmax, mmax=None, stride=1):
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mmax = mmax if mmax is not None else lmax
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sharp_make_triangular_alm_info(lmax, mmax, stride, &self.ainfo)
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cdef class rectangular_order(alm_info):
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def __init__(self, int lmax, mmax=None, stride=1):
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mmax = mmax if mmax is not None else lmax
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sharp_make_rectangular_alm_info(lmax, mmax, stride, &self.ainfo)
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cdef class packed_real_order(alm_info):
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def __init__(self, int lmax, stride=1, int[::1] ms=None):
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sharp_make_mmajor_real_packed_alm_info(lmax=lmax, stride=stride,
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nm=lmax + 1 if ms is None else ms.shape[0],
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ms=NULL if ms is None else &ms[0],
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alm_info=&self.ainfo)
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