Fix test_image path non-exist error in ci-travis (#2531)
Fix test_image path non-exist error in ci-travis (#2531)

* correct inception_v3 network

* store test images in class attribute

* PEP8

dolaameng/keras,kuza55/keras,kemaswill/keras,relh/keras,keras-team/keras,DeepGnosis/keras,nebw/keras,keras-team/keras