fix SegNet failing for some tensor sizes

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
src
architectures.py	279	150	46%	73, 86, 98, 144, 155, 188–196, 207–221, 232–283, 292–299, 309–317, 554–572, 584–602, 613–620, 631–714, 721–725, 734–747, 785–803, 816–831, 837–885, 909–915, 926–929, 975–976, 990, 992
cnn_lib.py	306	154	50%	46, 122–136, 154, 165, 175–177, 189–195, 219, 264–267, 287–309, 403–414, 445–459, 496–513, 523–528, 532–565, 576–586, 619–635, 645–649, 653–674, 685–695, 729–747, 757–771, 775–816, 836–847, 888–897, 907–911, 932–939, 978–997, 1008–1013, 1022
data_preparation.py	101	39	61%	36, 52, 56, 83, 91–101, 169–223
detect.py	60	60	0%	3–167
train.py	83	44	47%	29, 41, 59, 96, 110, 147–272
utils.py	43	21	51%	53–60, 73–80, 94–105
visualization.py	89	59	34%	26–40, 75, 97–181
TOTAL	967	527	46%

Tests	Skipped	Failures	Errors	Time
1	0 :zzz:	1 :x:	0 :fire:	13m 6s :stopwatch:

[pesekon2]

Closing as I didn't replicate #33. Close #33.