Hi Manan,
First, that is a very old version of the package. Farther up the tree `version.py` states it's version 0.6.1 - we are currently shipping version 0.11.3. I hope Python(X,Y) isn't still shipping 0.6.1. Before anything else, upgrade your scikit-image installation if needed.
Second, the test files is designed to test the package, not as direct examples of usage. They can be helpful to understand how files work, but realize they are unit tests. We run all files matching `test_*.py` in the repo using nosetests in our continuous integration builds. We don't want output from these; they are designed to pass if everything is well. So the fact that you don't get any output is working as intended, and reassuring. That means HOG is operating on your system.
The documentation for HOG is located here: http://scikit-image.org/docs/stable/api/skimage.feature.html#hog
I hope that helps set you on your way,
Josh
On Wednesday, June 24, 2015 at 8:15:48 PM UTC-5, Manan Dey wrote: