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Fix dask TriMesh rasterization #4935

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merged 4 commits into from
May 18, 2021
Merged

Fix dask TriMesh rasterization #4935

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1e32913
Fix dask TriMesh rasterization
philippjfr May 18, 2021
55f5164
Add warning
philippjfr May 18, 2021
bf47c35
Add tests
philippjfr May 18, 2021
4dd1986
Fix flakes
philippjfr May 18, 2021
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28 changes: 21 additions & 7 deletions holoviews/operation/datashader.py
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Original file line number Diff line number Diff line change
Expand Up @@ -987,16 +987,31 @@ class trimesh_rasterize(aggregate):
def _precompute(self, element, agg):
from datashader.utils import mesh
if element.vdims and getattr(agg, 'column', None) not in element.nodes.vdims:
simplices = element.dframe([0, 1, 2, 3])
verts = element.nodes.dframe([0, 1])
simplex_dims = [0, 1, 2, 3]
vert_dims = [0, 1]
elif element.nodes.vdims:
simplices = element.dframe([0, 1, 2])
verts = element.nodes.dframe([0, 1, 3])
simplex_dims = [0, 1, 2]
vert_dims = [0, 1, 3]
else:
raise ValueError("Cannot shade TriMesh without value dimension.")
if set([element.interface.datatype, element.nodes.interface.datatype]) == {'dask'}:
dims, node_dims = element.dimensions(), element.nodes.dimensions()
simplices = element.data[[dims[sd].name for sd in simplex_dims]]
verts = element.nodes.data[[node_dims[vd].name for vd in vert_dims]]
else:
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simplices = element.dframe(simplex_dims)
verts = element.nodes.dframe(vert_dims)
for c, dtype in zip(simplices.columns[:3], simplices.dtypes):
if dtype.kind != 'i':
simplices[c] = simplices[c].astype('int')
return {'mesh': mesh(verts, simplices), 'simplices': simplices,
'vertices': verts}
mesh = mesh(verts, simplices)
if hasattr(mesh, 'persist'):
mesh = mesh.persist()
return {
'mesh': mesh,
'simplices': simplices,
'vertices': verts
}

def _precompute_wireframe(self, element, agg):
if hasattr(element, '_wireframe'):
Expand Down Expand Up @@ -1037,7 +1052,6 @@ def _process(self, element, key=None):
precomputed = self._precompute_wireframe(element, agg)
else:
precomputed = self._precompute(element, agg)

bounds = (x_range[0], y_range[0], x_range[1], y_range[1])
params = self._get_agg_params(element, x, y, agg, bounds)

Expand Down