def test_allow_anything_to_bool(self):
# The cost should be large
min_cost = coercion_cost(dshape('int8'), dshape('complex[float64]'))
for ds in ['int8', 'int16', 'int32', 'int64', 'uint8', 'uint16',
'uint32', 'uint64', 'float32', 'float64',
'complex[float32]', 'complex[float64]']:
self.assertGreater(coercion_cost(dshape(ds), dshape('bool')),
min_cost)
def test_allow_anything_to_bool(self):
# The cost should be large
min_cost = coercion_cost(dshape('int8'), dshape('complex[float64]'))
for ds in [
'int8', 'int16', 'int32', 'int64', 'uint8', 'uint16', 'uint32',
'uint64', 'float32', 'float64', 'complex[float32]',
'complex[float64]'
]:
self.assertGreater(coercion_cost(dshape(ds), dshape('bool')),
min_cost)
def test_coerce_ctype(self):
a, b, c = dshapes('float32', 'float32', 'float64')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
a, b, c = dshapes('uint64', 'uint64', 'int64')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
a, b, c = dshapes('int64', 'int64', 'uint64')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
a, b, c = dshapes('float64', 'float64', 'complex[float32]')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_ctype_float_vs_complex(self):
# int -> float32 is preferred over int -> complex[float32]
a, b, c = dshapes('int32', 'float32', 'complex[float32]')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
# int -> float64 is preferred over int -> complex[float64]
a, b, c = dshapes('int32', 'float64', 'complex[float64]')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
# int -> float64 is preferred over int -> complex[float32]
a, b, c = dshapes('int32', 'float64', 'complex[float32]')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_ctype_float_vs_complex(self):
# int -> float32 is preferred over int -> complex[float32]
a, b, c = dshapes('int32', 'float32', 'complex[float32]')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
# int -> float64 is preferred over int -> complex[float64]
a, b, c = dshapes('int32', 'float64', 'complex[float64]')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
# int -> float64 is preferred over int -> complex[float32]
a, b, c = dshapes('int32', 'float64', 'complex[float32]')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
def match_by_weight(func, argtypes, constraints=None):
"""
Return all matched overloads for function `func` given `argtypes`.
Parameters
----------
func: Dispatcher
Overloaded Blaze function
argtypes: [Mono]
List of input argument types
constraints: [(TypeVar, Mono)]
Optional set of constraints, see unification.py
Returns
-------
{ weight : [Overload] }
"""
from datashape import coercion_cost
overloads = func.overloads
# -------------------------------------------------
# Find candidates
candidates = find_matches(overloads, argtypes, constraints or [])
# -------------------------------------------------
# Weigh candidates
matches = defaultdict(list)
for match in candidates:
in_signature = T.Function(*list(argtypes) + [T.TypeVar('R')])
signature = match.sig
try:
weight = coercion_cost(in_signature, signature)
except error.CoercionError:
pass
else:
matches[weight].append(match)
return matches
def test_coercion_transitivity(self):
a, b, c = dshapes('int8', 'complex128', 'float64')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_numeric(self):
a, b = dshapes('float32', 'float64')
self.assertGreater(coercion_cost(a, b), 0)
def test_coerce_ctype(self):
a, b, c = dshapes('float32', 'float32', 'float64')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_dst_ellipsis(self):
a, b, c = dshapes('10 * 10 * float32', 'X * ... * float64',
'X * Y * float64')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_broadcasting(self):
a, b, c = dshapes('10 * 10 * float32', '10 * Y * Z * float64',
'X * Y * float64')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_traits(self):
a, b, c = dshapes('10, 10, float32', '10, X, A : floating', '10, X, float32')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_src_ellipsis(self):
a, b, c = dshapes('10 * ... * float32', 'X * Y * float64',
'X * ... * float64')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_traits(self):
a, b, c = dshapes('10 * 10 * float32', '10 * X * A : floating',
'10 * X * float32')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_broadcasting3(self):
a, b, c = dshapes('10 * 10 * float32', '10 * 10 * 10 * float32',
'1 * 10 * 10 * float32')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_constrained_typevars(self):
a, b, c = dshapes('10 * 10 * float32', 'X * Y * float64',
'X * X * float64')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coercion_transitivity(self):
a, b, c = dshapes('int8', 'complex128', 'float64')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_numeric(self):
a, b = dshapes('float32', 'float64')
self.assertGreater(coercion_cost(a, b), 0)
def test_coerce_constrained_typevars(self):
a, b, c = dshapes('10, 10, float32', 'X, Y, float64', 'X, X, float64')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_broadcasting3(self):
a, b, c = dshapes('10, 10, float32', '10, 10, 10, float32', '1, 10, 10, float32')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_typevars(self):
a, b, c = dshapes('10 * 11 * float32', 'X * Y * float64',
'10 * Y * float64')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_src_ellipsis(self):
a, b, c = dshapes('10, ..., float32', 'X, Y, float64', 'X, ..., float64')
self.assertGreater(coercion_cost(a, b), coercion_cost(a, c))
def test_coerce_ctype(self):
a, b, c = dshapes('float32', 'float32', 'float64')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
a, b, c = dshapes('uint64', 'uint64', 'int64')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
a, b, c = dshapes('int64', 'int64', 'uint64')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
a, b, c = dshapes('float64', 'float64', 'complex[float32]')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
a, b, c = dshapes('int16', 'float64', 'complex[float32]')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))
a, b, c = dshapes('int8', 'float64', 'complex[float32]')
self.assertLess(coercion_cost(a, b), coercion_cost(a, c))