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Edit File: test_item_selection.py
import sys import numpy as np from numpy.testing import ( assert_, assert_raises, assert_array_equal, HAS_REFCOUNT ) class TestTake: def test_simple(self): a = [[1, 2], [3, 4]] a_str = [[b'1', b'2'], [b'3', b'4']] modes = ['raise', 'wrap', 'clip'] indices = [-1, 4] index_arrays = [np.empty(0, dtype=np.intp), np.empty(tuple(), dtype=np.intp), np.empty((1, 1), dtype=np.intp)] real_indices = {'raise': {-1: 1, 4: IndexError}, 'wrap': {-1: 1, 4: 0}, 'clip': {-1: 0, 4: 1}} # Currently all types but object, use the same function generation. # So it should not be necessary to test all. However test also a non # refcounted struct on top of object, which has a size that hits the # default (non-specialized) path. types = int, object, np.dtype([('', 'i2', 3)]) for t in types: # ta works, even if the array may be odd if buffer interface is used ta = np.array(a if np.issubdtype(t, np.number) else a_str, dtype=t) tresult = list(ta.T.copy()) for index_array in index_arrays: if index_array.size != 0: tresult[0].shape = (2,) + index_array.shape tresult[1].shape = (2,) + index_array.shape for mode in modes: for index in indices: real_index = real_indices[mode][index] if real_index is IndexError and index_array.size != 0: index_array.put(0, index) assert_raises(IndexError, ta.take, index_array, mode=mode, axis=1) elif index_array.size != 0: index_array.put(0, index) res = ta.take(index_array, mode=mode, axis=1) assert_array_equal(res, tresult[real_index]) else: res = ta.take(index_array, mode=mode, axis=1) assert_(res.shape == (2,) + index_array.shape) def test_refcounting(self): objects = [object() for i in range(10)] for mode in ('raise', 'clip', 'wrap'): a = np.array(objects) b = np.array([2, 2, 4, 5, 3, 5]) a.take(b, out=a[:6], mode=mode) del a if HAS_REFCOUNT: assert_(all(sys.getrefcount(o) == 3 for o in objects)) # not contiguous, example: a = np.array(objects * 2)[::2] a.take(b, out=a[:6], mode=mode) del a if HAS_REFCOUNT: assert_(all(sys.getrefcount(o) == 3 for o in objects)) def test_unicode_mode(self): d = np.arange(10) k = b'\xc3\xa4'.decode("UTF8") assert_raises(ValueError, d.take, 5, mode=k) def test_empty_partition(self): # In reference to github issue #6530 a_original = np.array([0, 2, 4, 6, 8, 10]) a = a_original.copy() # An empty partition should be a successful no-op a.partition(np.array([], dtype=np.int16)) assert_array_equal(a, a_original) def test_empty_argpartition(self): # In reference to github issue #6530 a = np.array([0, 2, 4, 6, 8, 10]) a = a.argpartition(np.array([], dtype=np.int16)) b = np.array([0, 1, 2, 3, 4, 5]) assert_array_equal(a, b)