def map(self, func):
"""
Apply a function on each subarray.
Parameters
----------
func : function
This is applied to each value in the intermediate RDD.
Returns
-------
StackedArray
"""
vshape = self.shape[self.split:]
x = self._rdd.values().first()
if x.shape == vshape:
a, b = asarray([x]), asarray([x, x])
else:
a, b = x, concatenate((x, x))
try:
atest = func(a)
btest = func(b)
except Exception as e:
raise RuntimeError(
"Error evaluating function on test array, got error:\n %s" % e)
if not (isinstance(atest, ndarray) and isinstance(btest, ndarray)):
raise ValueError("Function must return ndarray")
# different shapes map to the same new shape
elif atest.shape == btest.shape:
if self._rekeyed is True:
# we've already rekeyed
rdd = self._rdd.map(lambda kv: (kv[0], func(kv[1])))
shape = (self.shape[0], ) + atest.shape
else:
# do the rekeying
count, rdd = zip_with_index(self._rdd.values())
rdd = rdd.map(lambda kv: ((kv[1], ), func(kv[0])))
shape = (count, ) + atest.shape
split = 1
rekeyed = True
# different shapes stay different (along the first dimension)
elif atest.shape[0] == a.shape[0] and btest.shape[0] == b.shape[0]:
shape = self.shape[0:self.split] + atest.shape[1:]
split = self.split
rdd = self._rdd.map(lambda kv: (kv[0], func(kv[1])))
rekeyed = self._rekeyed
else:
raise ValueError("Cannot infer effect of function on shape")
return self._constructor(rdd,
rekeyed=rekeyed,
shape=shape,
split=split).__finalize__(self)
def map(self, func):
"""
Apply a function on each subarray.
Parameters
----------
func : function
This is applied to each value in the intermediate RDD.
Returns
-------
StackedArray
"""
vshape = self.shape[self.split:]
x = self._rdd.values().first()
if x.shape == vshape:
a, b = asarray([x]), asarray([x, x])
else:
a, b = x, concatenate((x, x))
try:
atest = func(a)
btest = func(b)
except Exception as e:
raise RuntimeError("Error evaluating function on test array, got error:\n %s" % e)
if not (isinstance(atest, ndarray) and isinstance(btest, ndarray)):
raise ValueError("Function must return ndarray")
# different shapes map to the same new shape
elif atest.shape == btest.shape:
if self._rekeyed is True:
# we've already rekeyed
rdd = self._rdd.map(lambda kv: (kv[0], func(kv[1])))
shape = (self.shape[0],) + atest.shape
else:
# do the rekeying
count, rdd = zip_with_index(self._rdd.values())
rdd = rdd.map(lambda kv: ((kv[1],), func(kv[0])))
shape = (count,) + atest.shape
split = 1
rekeyed = True
# different shapes stay different (along the first dimension)
elif atest.shape[0] == a.shape[0] and btest.shape[0] == b.shape[0]:
shape = self.shape[0:self.split] + atest.shape[1:]
split = self.split
rdd = self._rdd.map(lambda kv: (kv[0], func(kv[1])))
rekeyed = self._rekeyed
else:
raise ValueError("Cannot infer effect of function on shape")
return self._constructor(rdd, rekeyed=rekeyed, shape=shape, split=split).__finalize__(self)
def filter(self, func, axis=(0, ), sort=False):
"""
Filter array along an axis.
Applies a function which should evaluate to boolean,
along a single axis or multiple axes. Array will be
aligned so that the desired set of axes are in the keys,
which may incur a swap.
Parameters
----------
func : function
Function to apply, should return boolean
axis : tuple or int, optional, default=(0,)
Axis or multiple axes to filter along.
sort: bool, optional, default=False
Whether or not to sort by key before reindexing
Returns
-------
BoltArraySpark
"""
axis = tupleize(axis)
swapped = self._align(axis)
def f(record):
return func(record[1])
rdd = swapped._rdd.filter(f)
if sort:
rdd = rdd.sortByKey().values()
else:
rdd = rdd.values()
# count the resulting array in order to reindex (linearize) the keys
count, zipped = zip_with_index(rdd)
if not count:
count = zipped.count()
reindexed = zipped.map(lambda kv: (tupleize(kv[1]), kv[0]))
# since we can only filter over one axis, the remaining shape is always the following
remaining = list(swapped.shape[len(axis):])
if count != 0:
shape = tuple([count] + remaining)
else:
shape = (0, )
return self._constructor(reindexed, shape=shape,
split=swapped.split).__finalize__(swapped)
def filter(self, func, axis=(0,), sort=False):
"""
Filter array along an axis.
Applies a function which should evaluate to boolean,
along a single axis or multiple axes. Array will be
aligned so that the desired set of axes are in the keys,
which may incur a swap.
Parameters
----------
func : function
Function to apply, should return boolean
axis : tuple or int, optional, default=(0,)
Axis or multiple axes to filter along.
sort: bool, optional, default=False
Whether or not to sort by key before reindexing
Returns
-------
BoltArraySpark
"""
axis = tupleize(axis)
swapped = self._align(axis)
def f(record):
return func(record[1])
rdd = swapped._rdd.filter(f)
if sort:
rdd = rdd.sortByKey().values()
else:
rdd = rdd.values()
# count the resulting array in order to reindex (linearize) the keys
count, zipped = zip_with_index(rdd)
if not count:
count = zipped.count()
reindexed = zipped.map(lambda kv: (tupleize(kv[1]), kv[0]))
# since we can only filter over one axis, the remaining shape is always the following
remaining = list(swapped.shape[len(axis):])
if count != 0:
shape = tuple([count] + remaining)
else:
shape = (0,)
return self._constructor(reindexed, shape=shape, split=swapped.split).__finalize__(swapped)
def filter(self, func, axis=(0, )):
"""
Filter array along an axis.
Applies a function which should evaluate to boolean,
along a single axis or multiple axes. Array will be
aligned so that the desired set of axes are in the keys,
which may incur a swap.
Parameters
----------
func : function
Function to apply, should return boolean
axis : tuple or int, optional, default=(0,)
Axis or multiple axes to filter along.
Returns
-------
BoltArraySpark
"""
axis = tupleize(axis)
if len(axis) != 1:
raise NotImplementedError(
"Filtering over multiple axes will not be "
"supported until SparseBoltArray is implemented.")
swapped = self._align(axis)
rdd = swapped._rdd.values().filter(func)
# count the resulting array in order to reindex (linearize) the keys
count, zipped = zip_with_index(rdd)
if not count:
count = zipped.count()
reindexed = zipped.map(lambda kv: (kv[1], kv[0]))
# since we can only filter over one axis, the remaining shape is always the following
remaining = list(swapped.shape[1:])
if count != 0:
shape = tuple([count] + remaining)
else:
shape = (0, )
return self._constructor(reindexed, shape=shape,
split=swapped.split).__finalize__(swapped)
def filter(self, func, axis=(0, )):
"""
Filter array along an axis.
Applies a function which should evaluate to boolean,
along a single axis or multiple axes.
Parameters
----------
func : function
Function to apply, should return boolean
axis : tuple or int, optional, default=(0,)
Axis or multiple axes to filter along.
Returns
-------
BoltSparkArray
"""
axis = tupleize(axis)
if len(axis) != 1:
raise NotImplementedError(
"Filtering over multiple axes will not be "
"supported until SparseBoltArray is implemented.")
swapped = self._align(axis)
rdd = swapped._rdd.values().filter(func)
# count the resulting array in order to reindex (linearize) the keys
count, zipped = zip_with_index(rdd)
if not count:
count = zipped.count()
reindexed = zipped.map(lambda kv: (kv[1], kv[0]))
remaining = [
swapped.shape[dim] for dim in range(len(swapped.shape))
if dim not in axis
]
if count != 0:
shape = tuple([count] + remaining)
else:
shape = (0, )
return self._constructor(reindexed, shape=shape,
split=swapped.split).__finalize__(swapped)
def filter(self, func, axis=(0,)):
"""
Filter array along an axis.
Applies a function which should evaluate to boolean,
along a single axis or multiple axes. Array will be
aligned so that the desired set of axes are in the keys,
which may incur a swap.
Parameters
----------
func : function
Function to apply, should return boolean
axis : tuple or int, optional, default=(0,)
Axis or multiple axes to filter along.
Returns
-------
BoltArraySpark
"""
axis = tupleize(axis)
if len(axis) != 1:
raise NotImplementedError("Filtering over multiple axes will not be "
"supported until SparseBoltArray is implemented.")
swapped = self._align(axis)
rdd = swapped._rdd.values().filter(func)
# count the resulting array in order to reindex (linearize) the keys
count, zipped = zip_with_index(rdd)
if not count:
count = zipped.count()
reindexed = zipped.map(lambda kv: (kv[1], kv[0]))
# since we can only filter over one axis, the remaining shape is always the following
remaining = list(swapped.shape[1:])
if count != 0:
shape = tuple([count] + remaining)
else:
shape = (0,)
return self._constructor(reindexed, shape=shape, split=swapped.split).__finalize__(swapped)
def filter(self, func, axis=(0,)):
"""
Filter array along an axis.
Applies a function which should evaluate to boolean,
along a single axis or multiple axes.
Parameters
----------
func : function
Function to apply, should return boolean
axis : tuple or int, optional, default=(0,)
Axis or multiple axes to filter along.
Returns
-------
BoltSparkArray
"""
axis = tupleize(axis)
if len(axis) != 1:
raise NotImplementedError("Filtering over multiple axes will not be "
"supported until SparseBoltArray is implemented.")
swapped = self._align(axis)
rdd = swapped._rdd.values().filter(func)
# count the resulting array in order to reindex (linearize) the keys
count, zipped = zip_with_index(rdd)
if not count:
count = zipped.count()
reindexed = zipped.map(lambda kv: (kv[1], kv[0]))
remaining = [swapped.shape[dim] for dim in range(len(swapped.shape)) if dim not in axis]
if count != 0:
shape = tuple([count] + remaining)
else:
shape = (0,)
return self._constructor(reindexed, shape=shape, split=swapped.split).__finalize__(swapped)
