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Separate where combine_cpu functions by ndim #1265

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Aug 8, 2023
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Separate where combine_cpu functions by ndim #1265

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44 changes: 31 additions & 13 deletions datashader/reductions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,6 @@
from datashader.antialias import AntialiasCombination, AntialiasStage2
from datashader.utils import isminus1, isnull
from numba import cuda as nb_cuda
from numba.typed import List

try:
from datashader.transfer_functions._cuda_utils import (
Expand Down Expand Up @@ -1868,7 +1867,16 @@ def _build_combine(self, dshape, antialias, cuda, partitioned):
invalid = isminus1 if self.selector.uses_row_index(cuda, partitioned) else isnull

@ngjit
def combine_cpu(aggs, selector_aggs):
def combine_cpu_2d(aggs, selector_aggs):
ny, nx = aggs[0].shape
for y in range(ny):
for x in range(nx):
value = selector_aggs[1][y, x]
if not invalid(value) and append(x, y, selector_aggs[0], value) >= 0:
aggs[0][y, x] = aggs[1][y, x]

@ngjit
def combine_cpu_3d(aggs, selector_aggs):
ny, nx, ncat = aggs[0].shape
for y in range(ny):
for x in range(nx):
Expand All @@ -1878,9 +1886,21 @@ def combine_cpu(aggs, selector_aggs):
aggs[0][y, x, cat] = aggs[1][y, x, cat]

@ngjit
def combine_cpu_n(aggs, selector_aggs):
# Generic solution for combining dask partitions of a where
# reduction with a selector that is a FloatingNReduction.
def combine_cpu_n_3d(aggs, selector_aggs):
ny, nx, n = aggs[0].shape
for y in range(ny):
for x in range(nx):
for i in range(n):
value = selector_aggs[1][y, x, i]
if invalid(value):
break
update_index = append(x, y, selector_aggs[0], value)
if update_index < 0:
break
shift_and_insert(aggs[0][y, x], aggs[1][y, x, i], update_index)

@ngjit
def combine_cpu_n_4d(aggs, selector_aggs):
ny, nx, ncat, n = aggs[0].shape
for y in range(ny):
for x in range(nx):
Expand Down Expand Up @@ -1955,10 +1975,9 @@ def wrapped_combine(aggs, selector_aggs):
combine_cuda_n_4d[cuda_args(aggs[0].shape[:3])](aggs, selector_aggs)
else:
if ndim == 3:
# 4d view of each agg, note use of numba typed list.
aggs = List([np.expand_dims(agg, 2) for agg in aggs])
selector_aggs = List([np.expand_dims(agg, 2) for agg in selector_aggs])
combine_cpu_n(aggs, selector_aggs)
combine_cpu_n_3d(aggs, selector_aggs)
else:
combine_cpu_n_4d(aggs, selector_aggs)
else:
# ndim is either 2 (ny, nx) or 3 (ny, nx, ncat)
if cuda:
Expand All @@ -1968,10 +1987,9 @@ def wrapped_combine(aggs, selector_aggs):
combine_cuda_3d[cuda_args(aggs[0].shape)](aggs, selector_aggs)
else:
if ndim == 2:
# 3d view of each agg, note use of numba typed list.
aggs = List([np.expand_dims(agg, 2) for agg in aggs])
selector_aggs = List([np.expand_dims(agg, 2) for agg in selector_aggs])
combine_cpu(aggs, selector_aggs)
combine_cpu_2d(aggs, selector_aggs)
else:
combine_cpu_3d(aggs, selector_aggs)

return ret

Expand Down