test_packbits.py
17.1 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
import numpy as np
from numpy.testing import assert_array_equal, assert_equal, assert_raises
import pytest
from itertools import chain
def test_packbits():
# Copied from the docstring.
a = [[[1, 0, 1], [0, 1, 0]],
[[1, 1, 0], [0, 0, 1]]]
for dt in '?bBhHiIlLqQ':
arr = np.array(a, dtype=dt)
b = np.packbits(arr, axis=-1)
assert_equal(b.dtype, np.uint8)
assert_array_equal(b, np.array([[[160], [64]], [[192], [32]]]))
assert_raises(TypeError, np.packbits, np.array(a, dtype=float))
def test_packbits_empty():
shapes = [
(0,), (10, 20, 0), (10, 0, 20), (0, 10, 20), (20, 0, 0), (0, 20, 0),
(0, 0, 20), (0, 0, 0),
]
for dt in '?bBhHiIlLqQ':
for shape in shapes:
a = np.empty(shape, dtype=dt)
b = np.packbits(a)
assert_equal(b.dtype, np.uint8)
assert_equal(b.shape, (0,))
def test_packbits_empty_with_axis():
# Original shapes and lists of packed shapes for different axes.
shapes = [
((0,), [(0,)]),
((10, 20, 0), [(2, 20, 0), (10, 3, 0), (10, 20, 0)]),
((10, 0, 20), [(2, 0, 20), (10, 0, 20), (10, 0, 3)]),
((0, 10, 20), [(0, 10, 20), (0, 2, 20), (0, 10, 3)]),
((20, 0, 0), [(3, 0, 0), (20, 0, 0), (20, 0, 0)]),
((0, 20, 0), [(0, 20, 0), (0, 3, 0), (0, 20, 0)]),
((0, 0, 20), [(0, 0, 20), (0, 0, 20), (0, 0, 3)]),
((0, 0, 0), [(0, 0, 0), (0, 0, 0), (0, 0, 0)]),
]
for dt in '?bBhHiIlLqQ':
for in_shape, out_shapes in shapes:
for ax, out_shape in enumerate(out_shapes):
a = np.empty(in_shape, dtype=dt)
b = np.packbits(a, axis=ax)
assert_equal(b.dtype, np.uint8)
assert_equal(b.shape, out_shape)
@pytest.mark.parametrize('bitorder', ('little', 'big'))
def test_packbits_large(bitorder):
# test data large enough for 16 byte vectorization
a = np.array([1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0,
0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1,
1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0,
1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1,
1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1,
1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1,
0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1,
1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0,
1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1,
1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0,
0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1,
1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0,
1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0])
a = a.repeat(3)
for dtype in '?bBhHiIlLqQ':
arr = np.array(a, dtype=dtype)
b = np.packbits(arr, axis=None, bitorder=bitorder)
assert_equal(b.dtype, np.uint8)
r = [252, 127, 192, 3, 254, 7, 252, 0, 7, 31, 240, 0, 28, 1, 255, 252,
113, 248, 3, 255, 192, 28, 15, 192, 28, 126, 0, 224, 127, 255,
227, 142, 7, 31, 142, 63, 28, 126, 56, 227, 240, 0, 227, 128, 63,
224, 14, 56, 252, 112, 56, 255, 241, 248, 3, 240, 56, 224, 112,
63, 255, 255, 199, 224, 14, 0, 31, 143, 192, 3, 255, 199, 0, 1,
255, 224, 1, 255, 252, 126, 63, 0, 1, 192, 252, 14, 63, 0, 15,
199, 252, 113, 255, 3, 128, 56, 252, 14, 7, 0, 113, 255, 255, 142, 56, 227,
129, 248, 227, 129, 199, 31, 128]
if bitorder == 'big':
assert_array_equal(b, r)
# equal for size being multiple of 8
assert_array_equal(np.unpackbits(b, bitorder=bitorder)[:-4], a)
# check last byte of different remainders (16 byte vectorization)
b = [np.packbits(arr[:-i], axis=None)[-1] for i in range(1, 16)]
assert_array_equal(b, [128, 128, 128, 31, 30, 28, 24, 16, 0, 0, 0, 199,
198, 196, 192])
arr = arr.reshape(36, 25)
b = np.packbits(arr, axis=0)
assert_equal(b.dtype, np.uint8)
assert_array_equal(b, [[190, 186, 178, 178, 150, 215, 87, 83, 83, 195,
199, 206, 204, 204, 140, 140, 136, 136, 8, 40, 105,
107, 75, 74, 88],
[72, 216, 248, 241, 227, 195, 202, 90, 90, 83,
83, 119, 127, 109, 73, 64, 208, 244, 189, 45,
41, 104, 122, 90, 18],
[113, 120, 248, 216, 152, 24, 60, 52, 182, 150,
150, 150, 146, 210, 210, 246, 255, 255, 223,
151, 21, 17, 17, 131, 163],
[214, 210, 210, 64, 68, 5, 5, 1, 72, 88, 92,
92, 78, 110, 39, 181, 149, 220, 222, 218, 218,
202, 234, 170, 168],
[0, 128, 128, 192, 80, 112, 48, 160, 160, 224,
240, 208, 144, 128, 160, 224, 240, 208, 144,
144, 176, 240, 224, 192, 128]])
b = np.packbits(arr, axis=1)
assert_equal(b.dtype, np.uint8)
assert_array_equal(b, [[252, 127, 192, 0],
[ 7, 252, 15, 128],
[240, 0, 28, 0],
[255, 128, 0, 128],
[192, 31, 255, 128],
[142, 63, 0, 0],
[255, 240, 7, 0],
[ 7, 224, 14, 0],
[126, 0, 224, 0],
[255, 255, 199, 0],
[ 56, 28, 126, 0],
[113, 248, 227, 128],
[227, 142, 63, 0],
[ 0, 28, 112, 0],
[ 15, 248, 3, 128],
[ 28, 126, 56, 0],
[ 56, 255, 241, 128],
[240, 7, 224, 0],
[227, 129, 192, 128],
[255, 255, 254, 0],
[126, 0, 224, 0],
[ 3, 241, 248, 0],
[ 0, 255, 241, 128],
[128, 0, 255, 128],
[224, 1, 255, 128],
[248, 252, 126, 0],
[ 0, 7, 3, 128],
[224, 113, 248, 0],
[ 0, 252, 127, 128],
[142, 63, 224, 0],
[224, 14, 63, 0],
[ 7, 3, 128, 0],
[113, 255, 255, 128],
[ 28, 113, 199, 0],
[ 7, 227, 142, 0],
[ 14, 56, 252, 0]])
arr = arr.T.copy()
b = np.packbits(arr, axis=0)
assert_equal(b.dtype, np.uint8)
assert_array_equal(b, [[252, 7, 240, 255, 192, 142, 255, 7, 126, 255,
56, 113, 227, 0, 15, 28, 56, 240, 227, 255,
126, 3, 0, 128, 224, 248, 0, 224, 0, 142, 224,
7, 113, 28, 7, 14],
[127, 252, 0, 128, 31, 63, 240, 224, 0, 255,
28, 248, 142, 28, 248, 126, 255, 7, 129, 255,
0, 241, 255, 0, 1, 252, 7, 113, 252, 63, 14,
3, 255, 113, 227, 56],
[192, 15, 28, 0, 255, 0, 7, 14, 224, 199, 126,
227, 63, 112, 3, 56, 241, 224, 192, 254, 224,
248, 241, 255, 255, 126, 3, 248, 127, 224, 63,
128, 255, 199, 142, 252],
[0, 128, 0, 128, 128, 0, 0, 0, 0, 0, 0, 128, 0,
0, 128, 0, 128, 0, 128, 0, 0, 0, 128, 128,
128, 0, 128, 0, 128, 0, 0, 0, 128, 0, 0, 0]])
b = np.packbits(arr, axis=1)
assert_equal(b.dtype, np.uint8)
assert_array_equal(b, [[190, 72, 113, 214, 0],
[186, 216, 120, 210, 128],
[178, 248, 248, 210, 128],
[178, 241, 216, 64, 192],
[150, 227, 152, 68, 80],
[215, 195, 24, 5, 112],
[ 87, 202, 60, 5, 48],
[ 83, 90, 52, 1, 160],
[ 83, 90, 182, 72, 160],
[195, 83, 150, 88, 224],
[199, 83, 150, 92, 240],
[206, 119, 150, 92, 208],
[204, 127, 146, 78, 144],
[204, 109, 210, 110, 128],
[140, 73, 210, 39, 160],
[140, 64, 246, 181, 224],
[136, 208, 255, 149, 240],
[136, 244, 255, 220, 208],
[ 8, 189, 223, 222, 144],
[ 40, 45, 151, 218, 144],
[105, 41, 21, 218, 176],
[107, 104, 17, 202, 240],
[ 75, 122, 17, 234, 224],
[ 74, 90, 131, 170, 192],
[ 88, 18, 163, 168, 128]])
# result is the same if input is multiplied with a nonzero value
for dtype in 'bBhHiIlLqQ':
arr = np.array(a, dtype=dtype)
rnd = np.random.randint(low=np.iinfo(dtype).min,
high=np.iinfo(dtype).max, size=arr.size,
dtype=dtype)
rnd[rnd == 0] = 1
arr *= rnd.astype(dtype)
b = np.packbits(arr, axis=-1)
assert_array_equal(np.unpackbits(b)[:-4], a)
assert_raises(TypeError, np.packbits, np.array(a, dtype=float))
def test_packbits_very_large():
# test some with a larger arrays gh-8637
# code is covered earlier but larger array makes crash on bug more likely
for s in range(950, 1050):
for dt in '?bBhHiIlLqQ':
x = np.ones((200, s), dtype=bool)
np.packbits(x, axis=1)
def test_unpackbits():
# Copied from the docstring.
a = np.array([[2], [7], [23]], dtype=np.uint8)
b = np.unpackbits(a, axis=1)
assert_equal(b.dtype, np.uint8)
assert_array_equal(b, np.array([[0, 0, 0, 0, 0, 0, 1, 0],
[0, 0, 0, 0, 0, 1, 1, 1],
[0, 0, 0, 1, 0, 1, 1, 1]]))
def test_pack_unpack_order():
a = np.array([[2], [7], [23]], dtype=np.uint8)
b = np.unpackbits(a, axis=1)
assert_equal(b.dtype, np.uint8)
b_little = np.unpackbits(a, axis=1, bitorder='little')
b_big = np.unpackbits(a, axis=1, bitorder='big')
assert_array_equal(b, b_big)
assert_array_equal(a, np.packbits(b_little, axis=1, bitorder='little'))
assert_array_equal(b[:,::-1], b_little)
assert_array_equal(a, np.packbits(b_big, axis=1, bitorder='big'))
assert_raises(ValueError, np.unpackbits, a, bitorder='r')
assert_raises(TypeError, np.unpackbits, a, bitorder=10)
def test_unpackbits_empty():
a = np.empty((0,), dtype=np.uint8)
b = np.unpackbits(a)
assert_equal(b.dtype, np.uint8)
assert_array_equal(b, np.empty((0,)))
def test_unpackbits_empty_with_axis():
# Lists of packed shapes for different axes and unpacked shapes.
shapes = [
([(0,)], (0,)),
([(2, 24, 0), (16, 3, 0), (16, 24, 0)], (16, 24, 0)),
([(2, 0, 24), (16, 0, 24), (16, 0, 3)], (16, 0, 24)),
([(0, 16, 24), (0, 2, 24), (0, 16, 3)], (0, 16, 24)),
([(3, 0, 0), (24, 0, 0), (24, 0, 0)], (24, 0, 0)),
([(0, 24, 0), (0, 3, 0), (0, 24, 0)], (0, 24, 0)),
([(0, 0, 24), (0, 0, 24), (0, 0, 3)], (0, 0, 24)),
([(0, 0, 0), (0, 0, 0), (0, 0, 0)], (0, 0, 0)),
]
for in_shapes, out_shape in shapes:
for ax, in_shape in enumerate(in_shapes):
a = np.empty(in_shape, dtype=np.uint8)
b = np.unpackbits(a, axis=ax)
assert_equal(b.dtype, np.uint8)
assert_equal(b.shape, out_shape)
def test_unpackbits_large():
# test all possible numbers via comparison to already tested packbits
d = np.arange(277, dtype=np.uint8)
assert_array_equal(np.packbits(np.unpackbits(d)), d)
assert_array_equal(np.packbits(np.unpackbits(d[::2])), d[::2])
d = np.tile(d, (3, 1))
assert_array_equal(np.packbits(np.unpackbits(d, axis=1), axis=1), d)
d = d.T.copy()
assert_array_equal(np.packbits(np.unpackbits(d, axis=0), axis=0), d)
class TestCount():
x = np.array([
[1, 0, 1, 0, 0, 1, 0],
[0, 1, 1, 1, 0, 0, 0],
[0, 0, 1, 0, 0, 1, 1],
[1, 1, 0, 0, 0, 1, 1],
[1, 0, 1, 0, 1, 0, 1],
[0, 0, 1, 1, 1, 0, 0],
[0, 1, 0, 1, 0, 1, 0],
], dtype=np.uint8)
padded1 = np.zeros(57, dtype=np.uint8)
padded1[:49] = x.ravel()
padded1b = np.zeros(57, dtype=np.uint8)
padded1b[:49] = x[::-1].copy().ravel()
padded2 = np.zeros((9, 9), dtype=np.uint8)
padded2[:7, :7] = x
@pytest.mark.parametrize('bitorder', ('little', 'big'))
@pytest.mark.parametrize('count', chain(range(58), range(-1, -57, -1)))
def test_roundtrip(self, bitorder, count):
if count < 0:
# one extra zero of padding
cutoff = count - 1
else:
cutoff = count
# test complete invertibility of packbits and unpackbits with count
packed = np.packbits(self.x, bitorder=bitorder)
unpacked = np.unpackbits(packed, count=count, bitorder=bitorder)
assert_equal(unpacked.dtype, np.uint8)
assert_array_equal(unpacked, self.padded1[:cutoff])
@pytest.mark.parametrize('kwargs', [
{}, {'count': None},
])
def test_count(self, kwargs):
packed = np.packbits(self.x)
unpacked = np.unpackbits(packed, **kwargs)
assert_equal(unpacked.dtype, np.uint8)
assert_array_equal(unpacked, self.padded1[:-1])
@pytest.mark.parametrize('bitorder', ('little', 'big'))
# delta==-1 when count<0 because one extra zero of padding
@pytest.mark.parametrize('count', chain(range(8), range(-1, -9, -1)))
def test_roundtrip_axis(self, bitorder, count):
if count < 0:
# one extra zero of padding
cutoff = count - 1
else:
cutoff = count
packed0 = np.packbits(self.x, axis=0, bitorder=bitorder)
unpacked0 = np.unpackbits(packed0, axis=0, count=count,
bitorder=bitorder)
assert_equal(unpacked0.dtype, np.uint8)
assert_array_equal(unpacked0, self.padded2[:cutoff, :self.x.shape[1]])
packed1 = np.packbits(self.x, axis=1, bitorder=bitorder)
unpacked1 = np.unpackbits(packed1, axis=1, count=count,
bitorder=bitorder)
assert_equal(unpacked1.dtype, np.uint8)
assert_array_equal(unpacked1, self.padded2[:self.x.shape[0], :cutoff])
@pytest.mark.parametrize('kwargs', [
{}, {'count': None},
{'bitorder' : 'little'},
{'bitorder': 'little', 'count': None},
{'bitorder' : 'big'},
{'bitorder': 'big', 'count': None},
])
def test_axis_count(self, kwargs):
packed0 = np.packbits(self.x, axis=0)
unpacked0 = np.unpackbits(packed0, axis=0, **kwargs)
assert_equal(unpacked0.dtype, np.uint8)
if kwargs.get('bitorder', 'big') == 'big':
assert_array_equal(unpacked0, self.padded2[:-1, :self.x.shape[1]])
else:
assert_array_equal(unpacked0[::-1, :], self.padded2[:-1, :self.x.shape[1]])
packed1 = np.packbits(self.x, axis=1)
unpacked1 = np.unpackbits(packed1, axis=1, **kwargs)
assert_equal(unpacked1.dtype, np.uint8)
if kwargs.get('bitorder', 'big') == 'big':
assert_array_equal(unpacked1, self.padded2[:self.x.shape[0], :-1])
else:
assert_array_equal(unpacked1[:, ::-1], self.padded2[:self.x.shape[0], :-1])
def test_bad_count(self):
packed0 = np.packbits(self.x, axis=0)
assert_raises(ValueError, np.unpackbits, packed0, axis=0, count=-9)
packed1 = np.packbits(self.x, axis=1)
assert_raises(ValueError, np.unpackbits, packed1, axis=1, count=-9)
packed = np.packbits(self.x)
assert_raises(ValueError, np.unpackbits, packed, count=-57)