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Check for empty localarrays when Distributions are made #447

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Check for empty localarrays when Distributions are made #447

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4a5b506
Add Distribution.localsizes method.
cowlicks Jun 17, 2014
ea7313b
check for empty localarrays when Distributions are made.
cowlicks Jun 17, 2014
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23 changes: 23 additions & 0 deletions distarray/dist/maps.py
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Original file line number Diff line number Diff line change
Expand Up @@ -519,6 +519,11 @@ def from_dim_data_per_rank(cls, context, dim_data_per_rank, targets=None):
self.maps = [_map_from_axis_dim_dicts(axis_dim_dicts) for
axis_dim_dicts in axis_dim_dicts_per_axis]

# check for empty localarrays
sizes = self.localsizes()
if 0 in sizes:
raise ValueError("A localarray has zero size")

return self

@classmethod
Expand Down Expand Up @@ -567,6 +572,12 @@ def from_shape(cls, context, shape, dist=None, grid_shape=None,
# List of `ClientMap` objects, one per dimension.
self.maps = [map_from_sizes(*args)
for args in zip(self.shape, self.dist, self.grid_shape)]

# check for empty localarrays
sizes = self.localsizes()
if 0 in sizes:
raise ValueError("A localarray has zero size")

return self

def __init__(self, context, global_dim_data, targets=None):
Expand Down Expand Up @@ -673,6 +684,11 @@ def __init__(self, context, global_dim_data, targets=None):
nelts = reduce(operator.mul, self.grid_shape, 1)
self.rank_from_coords = np.arange(nelts).reshape(self.grid_shape)

# check for empty localarrays
sizes = self.localsizes()
if 0 in sizes:
raise ValueError("A localarray has zero size")

def __getitem__(self, idx):
return self.maps[idx]

Expand Down Expand Up @@ -782,3 +798,10 @@ def reduce(self, axes):

def localshapes(self):
return shapes_from_dim_data_per_rank(self.get_dim_data_per_rank())

def localsizes(self):
lshapes = shapes_from_dim_data_per_rank(self.get_dim_data_per_rank())
sizes = []
for shape in lshapes:
sizes.append(reduce(operator.mul, shape, 1))
return tuple(sizes)