def test_bag_array_conversion():
import dask.bag as db
b = db.range(10, npartitions=1)
x, = b.map_partitions(np.asarray).to_delayed()
x, = [da.from_delayed(a, shape=(10,), dtype=int) for a in [x]]
z = da.concatenate([x])
assert_eq(z, np.arange(10), check_graph=False)
def test_temporary_directory(tmpdir):
b = db.range(10, npartitions=4)
with dask.set_options(temporary_directory=str(tmpdir)):
b2 = b.groupby(lambda x: x % 2)
b2.compute()
assert any(fn.endswith('.partd') for fn in os.listdir(str(tmpdir)))
def test_temporary_directory():
b = db.range(10, npartitions=4)
with dask.set_options(temporary_directory=os.getcwd()):
b2 = b.groupby(lambda x: x % 2)
b2.compute()
assert any(fn.endswith('.partd') for fn in os.listdir(os.getcwd()))
def test_bag_array_conversion():
import dask.bag as db
b = db.range(10, npartitions=1)
x, = b.map_partitions(np.asarray).to_delayed()
x, = [da.from_delayed(a, shape=(10,), dtype=int) for a in [x]]
z = da.concatenate([x])
assert_eq(z, np.arange(10), check_graph=False)
def test_groupby_tasks_3():
func = lambda x: x % 10
b = db.range(20, npartitions=5).groupby(func,
shuffle="tasks",
max_branch=2)
result = b.compute(scheduler="sync")
assert dict(result) == groupby(func, range(20))
def test_temporary_directory(tmpdir):
b = db.range(10, npartitions=4)
with dask.config.set(temporary_directory=str(tmpdir)):
b2 = b.groupby(lambda x: x % 2)
b2.compute()
assert any(fn.endswith('.partd') for fn in os.listdir(str(tmpdir)))
def test_KFold_bag():
X = db.range(1000, npartitions=10)
y = db.range(1000, npartitions=10)
cv = list(KFold(4).split(X, y))
for x_train, y_train, x_test, y_test in cv:
train, test = dask.compute(x_train, x_test)
assert len(train) + len(test) == 1000
assert set(train) | set(test) == set(range(1000))
assert (first(KFold(3).split(X, y))[0].name ==
first(KFold(3).split(X, y))[0].name)
assert (first(KFold(4).split(X, y))[0].name !=
first(KFold(3).split(X, y))[0].name)
with pytest.raises(ValueError):
list(KFold(11).split(X, y))
def test_optimize_fuse_keys():
x = db.range(10, npartitions=2)
y = x.map(inc)
z = y.map(inc)
dsk = z._optimize(z.dask, z._keys())
assert not set(y.dask) & set(dsk)
dsk = z._optimize(z.dask, z._keys(), fuse_keys=y._keys())
assert all(k in dsk for k in y._keys())
def test_optimize_fuse_keys():
x = db.range(10, npartitions=2)
y = x.map(inc)
z = y.map(inc)
dsk = z.__dask_optimize__(z.dask, z.__dask_keys__())
assert not y.dask.keys() & dsk.keys()
dsk = z.__dask_optimize__(z.dask, z.__dask_keys__(), fuse_keys=y.__dask_keys__())
assert all(k in dsk for k in y.__dask_keys__())
def test_temporary_directory(tmpdir):
b = db.range(10, npartitions=4)
# We use a pool to avoid a race condition between the pool close
# cleaning up files, and the assert below.
with ProcessPoolExecutor(4) as pool:
with dask.config.set(temporary_directory=str(tmpdir), pool=pool):
b2 = b.groupby(lambda x: x % 2)
b2.compute()
assert any(fn.endswith(".partd") for fn in os.listdir(str(tmpdir)))
def test_random_split_errors():
b = db.range(1000, npartitions=10)
with pytest.raises(ValueError):
random_split(b, 2)
with pytest.raises(ValueError):
random_split(b, -1)
with pytest.raises(ValueError):
random_split(b, 0.5, "not-a-seed-or-RandomState")
with pytest.raises(TypeError):
random_split("not-a-dask-object", 0.5)
def test_optimize_fuse_keys():
x = db.range(10, npartitions=2)
y = x.map(inc)
z = y.map(inc)
dsk = z._optimize(z.dask, z._keys())
assert not set(y.dask) & set(dsk)
dsk = z._optimize(z.dask, z._keys(), fuse_keys=y._keys())
assert all(k in dsk for k in y._keys())
def test_random_split_bag():
b = db.range(1000, npartitions=10)
train, test = random_split(b, 0.2, 123)
assert random_split(b, 0.2, 123)[0].name == train.name
assert random_split(b, 0.3, 123)[0].name != train.name
assert random_split(b, 0.2)[0].name != random_split(b, 0.2)[0].name
train_c, test_c = dask.compute(train, test)
assert 0.75 < len(train_c) / 1000 < 0.85
assert len(train_c) + len(test_c) == 1000
assert set(train_c) | set(test_c) == set(range(1000))
def test_train_test_split():
x = np.arange(1000)
a = da.from_array(x, chunks=100)
m = dm.from_array(a)
b = db.range(1000, npartitions=10)
train_a, test_a = train_test_split(a, test_size=0.2, random_state=123)
train_a2, test_a2, train, test = train_test_split(a, a + 10, test_size=0.2,
random_state=123)
assert train_a2.name == train_a.name
assert test_a2.name == test_a.name
assert train_a2.name != train.name
assert train_a.chunks == train.chunks
assert test_a.chunks == test.chunks
train_b, test_b, train_m, test_m = train_test_split(b, m, random_state=123)
parts_b = train_b._get(train_b.dask, train_b._keys())
parts_m = train_m._get(train_m.dask, train_m._keys())
for p_b, p_m in zip(parts_b, parts_m):
assert set(p_b) == set(p_m)
with pytest.raises(ValueError):
train_test_split(a, invalid_option=1) # invalid kwargs
with pytest.raises(ValueError):
train_test_split(test_size=0.2) # no arrays
with pytest.raises(ValueError):
train_test_split(a, b) # not all da.Array
with pytest.raises(ValueError):
train_test_split(a, da.from_array(x, chunks=10)) # Not aligned
with pytest.raises(ValueError):
train_test_split(m, db.range(1000, npartitions=12)) # Not aligned
def test_optimize_globals():
da = pytest.importorskip("dask.array")
x = da.ones(10, chunks=(5, ))
def optimize_double(dsk, keys):
return {k: (mul, 2, v) for k, v in dsk.items()}
from dask.array.utils import assert_eq
assert_eq(x + 1, np.ones(10) + 1)
with dask.config.set(array_optimize=optimize_double):
assert_eq(x + 1, (np.ones(10) * 2 + 1) * 2, check_chunks=False)
assert_eq(x + 1, np.ones(10) + 1)
b = db.range(10, npartitions=2)
with dask.config.set(array_optimize=optimize_double):
xx, bb = dask.compute(x + 1, b.map(inc), scheduler="single-threaded")
assert_eq(xx, (np.ones(10) * 2 + 1) * 2)
def test_to_textfiles_empty_partitions():
with tmpdir() as d:
b = db.range(5, npartitions=5).filter(lambda x: x == 1).map(str)
b.to_textfiles(os.path.join(d, '*.txt'))
assert len(os.listdir(d)) == 5
def test_groupby_tasks_3():
func = lambda x: x % 10
b = db.range(20, npartitions=5).groupby(func, method='tasks', max_branch=2)
result = b.compute(get=dask.get)
assert dict(result) == groupby(func, range(20))
def test_aggregation(npartitions):
L = list(range(15))
b = db.range(15, npartitions=npartitions)
assert b.mean().compute(get=dask.get) == sum(L) / len(L)
assert b.sum().compute(get=dask.get) == sum(L)
assert b.count().compute(get=dask.get) == len(L)
def test_aggregation(npartitions):
L = list(range(15))
b = db.range(15, npartitions=npartitions)
assert_eq(b.mean(), sum(L) / len(L))
assert_eq(b.sum(), sum(L))
assert_eq(b.count(), len(L))
def test_groupby_tasks_2(size, npartitions, groups):
func = lambda x: x % groups
b = db.range(size, npartitions=npartitions).groupby(func, shuffle="tasks")
result = b.compute(scheduler="sync")
assert dict(result) == groupby(func, range(size))
def test_groupby_tasks_3():
func = lambda x: x % 10
b = db.range(20, npartitions=5).groupby(func, shuffle='tasks', max_branch=2)
result = b.compute(scheduler='sync')
assert dict(result) == groupby(func, range(20))
def test_aggregation(npartitions):
L = list(range(15))
b = db.range(15, npartitions=npartitions)
assert_eq(b.mean(), sum(L) / len(L))
assert_eq(b.sum(), sum(L))
assert_eq(b.count(), len(L))
def test_bag_groupby_tasks_default(e, s, a, b):
with dask.set_options(get=e.get):
b = db.range(100, npartitions=10)
b2 = b.groupby(lambda x: x % 13)
assert not any('partd' in k[0] for k in b2.dask)
def test_range():
for npartitions in [1, 7, 10, 28]:
b = db.range(100, npartitions=npartitions)
assert len(b.dask) == npartitions
assert b.npartitions == npartitions
assert list(b) == list(range(100))
def test_bag_groupby_tasks_default(c, s, a, b):
b = db.range(100, npartitions=10)
b2 = b.groupby(lambda x: x % 13)
assert not any('partd' in k[0] for k in b2.dask)
def test_groupby_tasks_3():
func = lambda x: x % 10
b = db.range(20, npartitions=5).groupby(func, method='tasks', max_branch=2)
result = b.compute(get=dask.get)
assert dict(result) == groupby(func, range(20))
def test_groupby_tasks_2(size, npartitions, groups):
func = lambda x: x % groups
b = db.range(size, npartitions=npartitions).groupby(func, shuffle='tasks')
result = b.compute(scheduler='sync')
assert dict(result) == groupby(func, range(size))
def test_bag_groupby_tasks_default(c, s, a, b):
b = db.range(100, npartitions=10)
b2 = b.groupby(lambda x: x % 13)
assert not any('partd' in k[0] for k in b2.dask)
def test_repeated_groupby():
b = db.range(10, npartitions=4)
c = b.groupby(lambda x: x % 3)
assert valmap(len, dict(c)) == valmap(len, dict(c))
def test_fit(self):
d = from_sklearn(self.sk)
b = db.from_sequence(self.raw_X)
fit = d.fit(b, db.range(len(self.raw_X), len(self.raw_X)))
assert fit is d
def test_aggregation(npartitions):
L = list(range(15))
b = db.range(15, npartitions=npartitions)
assert b.mean().compute(get=dask.get) == sum(L) / len(L)
assert b.sum().compute(get=dask.get) == sum(L)
assert b.count().compute(get=dask.get) == len(L)
def test_repeated_groupby():
b = db.range(10, npartitions=4)
c = b.groupby(lambda x: x % 3)
assert valmap(len, dict(c)) == valmap(len, dict(c))
def test_groupby_tasks_2(size, npartitions, groups):
func = lambda x: x % groups
b = db.range(size, npartitions=npartitions).groupby(func, method='tasks')
result = b.compute(get=dask.get)
assert dict(result) == groupby(func, range(size))
def test_bag_groupby_tasks_default(e, s, a, b):
with dask.set_options(get=e.get):
b = db.range(100, npartitions=10)
b2 = b.groupby(lambda x: x % 13)
assert not any('partd' in k[0] for k in b2.dask)
def test_to_textfiles_empty_partitions():
with tmpdir() as d:
b = db.range(5, npartitions=5).filter(lambda x: x == 1).map(str)
b.to_textfiles(os.path.join(d, '*.txt'))
assert len(os.listdir(d)) == 5
def test_groupby_tasks_2(size, npartitions, groups):
func = lambda x: x % groups
b = db.range(size, npartitions=npartitions).groupby(func, method='tasks')
result = b.compute(get=dask.get)
assert dict(result) == groupby(func, range(size))
def test_range():
for npartitions in [1, 7, 10, 28]:
b = db.range(100, npartitions=npartitions)
assert len(b.dask) == npartitions
assert b.npartitions == npartitions
assert list(b) == list(range(100))
from dask import bag as db
from dask.diagnostics import ProgressBar
import sprite2.aws
import sprite2.dask
import math
# primality test
def is_prime(n):
if n % 2 == 0 and n > 2:
return False
return all(n % i for i in range(3, int(math.sqrt(n)) + 1, 2))
# chunk 10 million
d = (db.range(100000000, npartitions=100).filter(is_prime).count())
# compute result
with ProgressBar():
result = d.compute(get=sprite2.dask.get)
print(result)
