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216 lines
6.9 KiB
216 lines
6.9 KiB
import numbers
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import operator
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import numpy as np
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from numpy.testing import assert_, assert_equal, assert_raises
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# NOTE: This class should be kept as an exact copy of the example from the
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# docstring for NDArrayOperatorsMixin.
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class ArrayLike(np.lib.mixins.NDArrayOperatorsMixin):
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def __init__(self, value):
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self.value = np.asarray(value)
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# One might also consider adding the built-in list type to this
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# list, to support operations like np.add(array_like, list)
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_HANDLED_TYPES = (np.ndarray, numbers.Number)
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def __array_ufunc__(self, ufunc, method, *inputs, **kwargs):
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out = kwargs.get('out', ())
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for x in inputs + out:
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# Only support operations with instances of _HANDLED_TYPES.
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# Use ArrayLike instead of type(self) for isinstance to
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# allow subclasses that don't override __array_ufunc__ to
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# handle ArrayLike objects.
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if not isinstance(x, self._HANDLED_TYPES + (ArrayLike,)):
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return NotImplemented
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# Defer to the implementation of the ufunc on unwrapped values.
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inputs = tuple(x.value if isinstance(x, ArrayLike) else x
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for x in inputs)
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if out:
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kwargs['out'] = tuple(
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x.value if isinstance(x, ArrayLike) else x
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for x in out)
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result = getattr(ufunc, method)(*inputs, **kwargs)
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if type(result) is tuple:
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# multiple return values
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return tuple(type(self)(x) for x in result)
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elif method == 'at':
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# no return value
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return None
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else:
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# one return value
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return type(self)(result)
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def __repr__(self):
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return '%s(%r)' % (type(self).__name__, self.value)
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def wrap_array_like(result):
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if type(result) is tuple:
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return tuple(ArrayLike(r) for r in result)
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else:
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return ArrayLike(result)
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def _assert_equal_type_and_value(result, expected, err_msg=None):
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assert_equal(type(result), type(expected), err_msg=err_msg)
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if isinstance(result, tuple):
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assert_equal(len(result), len(expected), err_msg=err_msg)
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for result_item, expected_item in zip(result, expected):
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_assert_equal_type_and_value(result_item, expected_item, err_msg)
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else:
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assert_equal(result.value, expected.value, err_msg=err_msg)
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assert_equal(getattr(result.value, 'dtype', None),
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getattr(expected.value, 'dtype', None), err_msg=err_msg)
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_ALL_BINARY_OPERATORS = [
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operator.lt,
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operator.le,
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operator.eq,
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operator.ne,
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operator.gt,
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operator.ge,
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operator.add,
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operator.sub,
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operator.mul,
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operator.truediv,
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operator.floordiv,
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operator.mod,
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divmod,
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pow,
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operator.lshift,
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operator.rshift,
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operator.and_,
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operator.xor,
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operator.or_,
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]
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class TestNDArrayOperatorsMixin:
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def test_array_like_add(self):
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def check(result):
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_assert_equal_type_and_value(result, ArrayLike(0))
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check(ArrayLike(0) + 0)
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check(0 + ArrayLike(0))
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check(ArrayLike(0) + np.array(0))
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check(np.array(0) + ArrayLike(0))
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check(ArrayLike(np.array(0)) + 0)
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check(0 + ArrayLike(np.array(0)))
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check(ArrayLike(np.array(0)) + np.array(0))
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check(np.array(0) + ArrayLike(np.array(0)))
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def test_inplace(self):
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array_like = ArrayLike(np.array([0]))
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array_like += 1
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_assert_equal_type_and_value(array_like, ArrayLike(np.array([1])))
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array = np.array([0])
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array += ArrayLike(1)
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_assert_equal_type_and_value(array, ArrayLike(np.array([1])))
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def test_opt_out(self):
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class OptOut:
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"""Object that opts out of __array_ufunc__."""
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__array_ufunc__ = None
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def __add__(self, other):
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return self
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def __radd__(self, other):
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return self
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array_like = ArrayLike(1)
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opt_out = OptOut()
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# supported operations
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assert_(array_like + opt_out is opt_out)
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assert_(opt_out + array_like is opt_out)
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# not supported
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with assert_raises(TypeError):
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# don't use the Python default, array_like = array_like + opt_out
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array_like += opt_out
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with assert_raises(TypeError):
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array_like - opt_out
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with assert_raises(TypeError):
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opt_out - array_like
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def test_subclass(self):
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class SubArrayLike(ArrayLike):
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"""Should take precedence over ArrayLike."""
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x = ArrayLike(0)
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y = SubArrayLike(1)
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_assert_equal_type_and_value(x + y, y)
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_assert_equal_type_and_value(y + x, y)
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def test_object(self):
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x = ArrayLike(0)
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obj = object()
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with assert_raises(TypeError):
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x + obj
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with assert_raises(TypeError):
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obj + x
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with assert_raises(TypeError):
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x += obj
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def test_unary_methods(self):
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array = np.array([-1, 0, 1, 2])
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array_like = ArrayLike(array)
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for op in [operator.neg,
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operator.pos,
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abs,
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operator.invert]:
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_assert_equal_type_and_value(op(array_like), ArrayLike(op(array)))
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def test_forward_binary_methods(self):
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array = np.array([-1, 0, 1, 2])
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array_like = ArrayLike(array)
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for op in _ALL_BINARY_OPERATORS:
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expected = wrap_array_like(op(array, 1))
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actual = op(array_like, 1)
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err_msg = 'failed for operator {}'.format(op)
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_assert_equal_type_and_value(expected, actual, err_msg=err_msg)
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def test_reflected_binary_methods(self):
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for op in _ALL_BINARY_OPERATORS:
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expected = wrap_array_like(op(2, 1))
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actual = op(2, ArrayLike(1))
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err_msg = 'failed for operator {}'.format(op)
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_assert_equal_type_and_value(expected, actual, err_msg=err_msg)
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def test_matmul(self):
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array = np.array([1, 2], dtype=np.float64)
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array_like = ArrayLike(array)
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expected = ArrayLike(np.float64(5))
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_assert_equal_type_and_value(expected, np.matmul(array_like, array))
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_assert_equal_type_and_value(
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expected, operator.matmul(array_like, array))
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_assert_equal_type_and_value(
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expected, operator.matmul(array, array_like))
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def test_ufunc_at(self):
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array = ArrayLike(np.array([1, 2, 3, 4]))
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assert_(np.negative.at(array, np.array([0, 1])) is None)
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_assert_equal_type_and_value(array, ArrayLike([-1, -2, 3, 4]))
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def test_ufunc_two_outputs(self):
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mantissa, exponent = np.frexp(2 ** -3)
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expected = (ArrayLike(mantissa), ArrayLike(exponent))
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_assert_equal_type_and_value(
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np.frexp(ArrayLike(2 ** -3)), expected)
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_assert_equal_type_and_value(
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np.frexp(ArrayLike(np.array(2 ** -3))), expected)
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