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test_delayed.py
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test_delayed.py
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from collections import namedtuple
from operator import add, setitem
import pickle
from random import random
from toolz import identity, partial, merge
import pytest
import dask
from dask import set_options, compute
from dask.compatibility import PY2, PY3
from dask.delayed import delayed, to_task_dask, Delayed
from dask.utils_test import inc
class Tuple(object):
__dask_scheduler__ = staticmethod(dask.threaded.get)
def __init__(self, dsk, keys):
self._dask = dsk
self._keys = keys
def __dask_tokenize__(self):
return self._keys
def __dask_graph__(self):
return self._dask
def __dask_keys__(self):
return self._keys
def __dask_postcompute__(self):
return tuple, ()
def test_to_task_dask():
a = delayed(1, name='a')
b = delayed(2, name='b')
task, dask = to_task_dask([a, b, 3])
assert task == ['a', 'b', 3]
task, dask = to_task_dask((a, b, 3))
assert task == (tuple, ['a', 'b', 3])
assert dict(dask) == merge(a.dask, b.dask)
task, dask = to_task_dask({a: 1, b: 2})
assert (task == (dict, [['b', 2], ['a', 1]]) or
task == (dict, [['a', 1], ['b', 2]]))
assert dict(dask) == merge(a.dask, b.dask)
f = namedtuple('f', ['x', 'y'])
x = f(1, 2)
task, dask = to_task_dask(x)
assert task == x
assert dict(dask) == {}
task, dask = to_task_dask(slice(a, b, 3))
assert task == (slice, 'a', 'b', 3)
assert dict(dask) == merge(a.dask, b.dask)
# Issue https://github.com/dask/dask/issues/2107
class MyClass(dict):
pass
task, dask = to_task_dask(MyClass())
assert type(task) is MyClass
assert dict(dask) == {}
# Custom dask objects
x = Tuple({'a': 1, 'b': 2, 'c': (add, 'a', 'b')}, ['a', 'b', 'c'])
task, dask = to_task_dask(x)
assert task in dask
f = dask.pop(task)
assert f == (tuple, ['a', 'b', 'c'])
assert dask == x._dask
def test_delayed():
add2 = delayed(add)
assert add2(1, 2).compute() == 3
assert (add2(1, 2) + 3).compute() == 6
assert add2(add2(1, 2), 3).compute() == 6
a = delayed(1)
assert a.compute() == 1
assert 1 in a.dask.values()
b = add2(add2(a, 2), 3)
assert a.key in b.dask
def test_operators():
a = delayed([1, 2, 3])
assert a[0].compute() == 1
assert (a + a).compute() == [1, 2, 3, 1, 2, 3]
b = delayed(2)
assert a[:b].compute() == [1, 2]
a = delayed(10)
assert (a + 1).compute() == 11
assert (1 + a).compute() == 11
assert (a >> 1).compute() == 5
assert (a > 2).compute()
assert (a ** 2).compute() == 100
def test_methods():
a = delayed("a b c d e")
assert a.split(' ').compute() == ['a', 'b', 'c', 'd', 'e']
assert a.upper().replace('B', 'A').split().count('A').compute() == 2
assert a.split(' ', pure=True).key == a.split(' ', pure=True).key
o = a.split(' ', dask_key_name='test')
assert o.key == 'test'
def test_attributes():
a = delayed(2 + 1j)
assert a.real._key == a.real._key
assert a.real.compute() == 2
assert a.imag.compute() == 1
assert (a.real + a.imag).compute() == 3
def test_method_getattr_call_same_task():
a = delayed([1, 2, 3])
o = a.index(1)
# Don't getattr the method, then call in separate task
assert getattr not in set(v[0] for v in o.__dask_graph__().values())
def test_delayed_errors():
a = delayed([1, 2, 3])
# Immutable
pytest.raises(TypeError, lambda: setattr(a, 'foo', 1))
pytest.raises(TypeError, lambda: setitem(a, 1, 0))
# Can't iterate, or check if contains
pytest.raises(TypeError, lambda: 1 in a)
pytest.raises(TypeError, lambda: list(a))
# No dynamic generation of magic/hidden methods
pytest.raises(AttributeError, lambda: a._hidden())
# Truth of delayed forbidden
pytest.raises(TypeError, lambda: bool(a))
def test_common_subexpressions():
a = delayed([1, 2, 3])
res = a[0] + a[0]
assert a[0].key in res.dask
assert a.key in res.dask
assert len(res.dask) == 3
def test_lists():
a = delayed(1)
b = delayed(2)
c = delayed(sum)([a, b])
assert c.compute() == 3
def test_literates():
a = delayed(1)
b = a + 1
lit = (a, b, 3)
assert delayed(lit).compute() == (1, 2, 3)
lit = [a, b, 3]
assert delayed(lit).compute() == [1, 2, 3]
lit = set((a, b, 3))
assert delayed(lit).compute() == set((1, 2, 3))
lit = {a: 'a', b: 'b', 3: 'c'}
assert delayed(lit).compute() == {1: 'a', 2: 'b', 3: 'c'}
assert delayed(lit)[a].compute() == 'a'
lit = {'a': a, 'b': b, 'c': 3}
assert delayed(lit).compute() == {'a': 1, 'b': 2, 'c': 3}
assert delayed(lit)['a'].compute() == 1
def test_literates_keys():
a = delayed(1)
b = a + 1
lit = (a, b, 3)
assert delayed(lit).key != delayed(lit).key
assert delayed(lit, pure=True).key == delayed(lit, pure=True).key
def test_lists_are_concrete():
a = delayed(1)
b = delayed(2)
c = delayed(max)([[a, 10], [b, 20]], key=lambda x: x[0])[1]
assert c.compute() == 20
def test_iterators():
a = delayed(1)
b = delayed(2)
c = delayed(sum)(iter([a, b]))
assert c.compute() == 3
def f(seq):
return sum(seq)
c = delayed(f)(iter([a, b]))
assert c.compute() == 3
def test_traverse_false():
# Create a list with a dask value, and test that it's not computed
def fail(*args):
raise ValueError("shouldn't have computed")
a = delayed(fail)()
# list
x = [a, 1, 2, 3]
res = delayed(x, traverse=False).compute()
assert len(res) == 4
assert res[0] is a
assert res[1:] == x[1:]
# tuple that looks like a task
x = (fail, a, (fail, a))
res = delayed(x, traverse=False).compute()
assert isinstance(res, tuple)
assert res[0] == fail
assert res[1] is a
# list containing task-like-things
x = [1, (fail, a), a]
res = delayed(x, traverse=False).compute()
assert isinstance(res, list)
assert res[0] == 1
assert res[1][0] == fail and res[1][1] is a
assert res[2] is a
# traverse=False still hits top level
b = delayed(1)
x = delayed(b, traverse=False)
assert x.compute() == 1
def test_pure():
v1 = delayed(add, pure=True)(1, 2)
v2 = delayed(add, pure=True)(1, 2)
assert v1.key == v2.key
myrand = delayed(random)
assert myrand().key != myrand().key
def test_pure_global_setting():
# delayed functions
func = delayed(add)
with set_options(delayed_pure=True):
assert func(1, 2).key == func(1, 2).key
with set_options(delayed_pure=False):
assert func(1, 2).key != func(1, 2).key
func = delayed(add, pure=True)
with set_options(delayed_pure=False):
assert func(1, 2).key == func(1, 2).key
# delayed objects
assert delayed(1).key != delayed(1).key
with set_options(delayed_pure=True):
assert delayed(1).key == delayed(1).key
with set_options(delayed_pure=False):
assert delayed(1, pure=True).key == delayed(1, pure=True).key
# delayed methods
data = delayed([1, 2, 3])
assert data.index(1).key != data.index(1).key
with set_options(delayed_pure=True):
assert data.index(1).key == data.index(1).key
assert data.index(1, pure=False).key != data.index(1, pure=False).key
with set_options(delayed_pure=False):
assert data.index(1, pure=True).key == data.index(1, pure=True).key
# magic methods always pure
with set_options(delayed_pure=False):
assert data.index.key == data.index.key
element = data[0]
assert (element + element).key == (element + element).key
def test_nout():
func = delayed(lambda x: (x, -x), nout=2, pure=True)
x = func(1)
assert len(x) == 2
a, b = x
assert compute(a, b) == (1, -1)
assert a._length is None
assert b._length is None
pytest.raises(TypeError, lambda: len(a))
pytest.raises(TypeError, lambda: list(a))
pytest.raises(ValueError, lambda: delayed(add, nout=-1))
pytest.raises(ValueError, lambda: delayed(add, nout=True))
func = delayed(add, nout=None)
a = func(1)
assert a._length is None
pytest.raises(TypeError, lambda: list(a))
pytest.raises(TypeError, lambda: len(a))
func = delayed(lambda x: (x,), nout=1, pure=True)
x = func(1)
assert len(x) == 1
a, = x
assert a.compute() == 1
assert a._length is None
pytest.raises(TypeError, lambda: len(a))
func = delayed(lambda x: tuple(), nout=0, pure=True)
x = func(1)
assert len(x) == 0
assert x.compute() == tuple()
def test_kwargs():
def mysum(a, b, c=(), **kwargs):
return a + b + sum(c) + sum(kwargs.values())
dmysum = delayed(mysum)
ten = dmysum(1, 2, c=[delayed(3), 0], four=dmysum(2, 2))
assert ten.compute() == 10
dmysum = delayed(mysum, pure=True)
c = [delayed(3), 0]
ten = dmysum(1, 2, c=c, four=dmysum(2, 2))
assert ten.compute() == 10
assert dmysum(1, 2, c=c, four=dmysum(2, 2)).key == ten.key
assert dmysum(1, 2, c=c, four=dmysum(2, 3)).key != ten.key
assert dmysum(1, 2, c=c, four=4).key != ten.key
assert dmysum(1, 2, c=c, four=4).key != dmysum(2, 2, c=c, four=4).key
def test_custom_delayed():
x = Tuple({'a': 1, 'b': 2, 'c': (add, 'a', 'b')}, ['a', 'b', 'c'])
x2 = delayed(add, pure=True)(x, (4, 5, 6))
n = delayed(len, pure=True)(x)
assert delayed(len, pure=True)(x).key == n.key
assert x2.compute() == (1, 2, 3, 4, 5, 6)
assert compute(n, x2, x) == (3, (1, 2, 3, 4, 5, 6), (1, 2, 3))
def test_array_delayed():
np = pytest.importorskip('numpy')
da = pytest.importorskip('dask.array')
arr = np.arange(100).reshape((10, 10))
darr = da.from_array(arr, chunks=(5, 5))
val = delayed(sum)([arr, darr, 1])
assert isinstance(val, Delayed)
assert np.allclose(val.compute(), arr + arr + 1)
assert val.sum().compute() == (arr + arr + 1).sum()
assert val[0, 0].compute() == (arr + arr + 1)[0, 0]
task, dsk = to_task_dask(darr)
orig = set(darr.dask)
final = set(dsk)
assert orig.issubset(final)
diff = final.difference(orig)
assert len(diff) == 1
delayed_arr = delayed(darr)
assert (delayed_arr.compute() == arr).all()
def test_array_bag_delayed():
db = pytest.importorskip('dask.bag')
da = pytest.importorskip('dask.array')
np = pytest.importorskip('numpy')
arr1 = np.arange(100).reshape((10, 10))
arr2 = arr1.dot(arr1.T)
darr1 = da.from_array(arr1, chunks=(5, 5))
darr2 = da.from_array(arr2, chunks=(5, 5))
b = db.from_sequence([1, 2, 3])
seq = [arr1, arr2, darr1, darr2, b]
out = delayed(sum)([i.sum() for i in seq])
assert out.compute() == 2 * arr1.sum() + 2 * arr2.sum() + sum([1, 2, 3])
def test_delayed_picklable():
# Delayed
x = delayed(divmod, nout=2, pure=True)(1, 2)
y = pickle.loads(pickle.dumps(x))
assert x.dask == y.dask
assert x._key == y._key
assert x._length == y._length
# DelayedLeaf
x = delayed(1j + 2)
y = pickle.loads(pickle.dumps(x))
assert x.dask == y.dask
assert x._key == y._key
assert x._nout == y._nout
assert x._pure == y._pure
# DelayedAttr
x = x.real
y = pickle.loads(pickle.dumps(x))
assert x._obj._key == y._obj._key
assert x._obj.dask == y._obj.dask
assert x._attr == y._attr
assert x._key == y._key
def test_delayed_compute_forward_kwargs():
x = delayed(1) + 2
x.compute(bogus_keyword=10)
def test_delayed_method_descriptor():
delayed(bytes.decode)(b'') # does not err
def test_delayed_callable():
f = delayed(add, pure=True)
v = f(1, 2)
assert v.dask == {v.key: (add, 1, 2)}
assert f.dask == {f.key: add}
assert f.compute() == add
def test_delayed_name_on_call():
f = delayed(add, pure=True)
assert f(1, 2, dask_key_name='foo')._key == 'foo'
def test_callable_obj():
class Foo(object):
def __init__(self, a):
self.a = a
def __call__(self):
return 2
foo = Foo(1)
f = delayed(foo)
assert f.compute() is foo
assert f.a.compute() == 1
assert f().compute() == 2
def test_name_consistent_across_instances():
func = delayed(identity, pure=True)
data = {'x': 1, 'y': 25, 'z': [1, 2, 3]}
if PY2:
assert func(data)._key == 'identity-6700b857eea9a7d3079762c9a253ffbd'
if PY3:
assert func(data)._key == 'identity-84c5e2194036c17d1d97c4e3a2b90482'
data = {'x': 1, 1: 'x'}
assert func(data)._key == func(data)._key
if PY2:
assert func(1)._key == 'identity-91f02358e13dca18cde218a63fee436a'
if PY3:
assert func(1)._key == 'identity-7126728842461bf3d2caecf7b954fa3b'
def test_sensitive_to_partials():
assert (delayed(partial(add, 10), pure=True)(2)._key !=
delayed(partial(add, 20), pure=True)(2)._key)
def test_delayed_name():
assert delayed(1)._key.startswith('int-')
assert delayed(1, pure=True)._key.startswith('int-')
assert delayed(1, name='X')._key == 'X'
def myfunc(x):
return x + 1
assert delayed(myfunc)(1).key.startswith('myfunc')
def test_finalize_name():
da = pytest.importorskip('dask.array')
x = da.ones(10, chunks=5)
v = delayed([x])
assert set(x.dask).issubset(v.dask)
def key(s):
if isinstance(s, tuple):
s = s[0]
return s.split('-')[0]
assert all(key(k).isalpha() for k in v.dask)
def test_keys_from_array():
da = pytest.importorskip('dask.array')
from dask.array.utils import _check_dsk
X = da.ones((10, 10), chunks=5).to_delayed().flatten()
xs = [delayed(inc)(x) for x in X]
_check_dsk(xs[0].dask)