All assignments and provided code scaffolds owned by Columbia University.
You can use my solutions under the open CC BY-SA 3.0 license and cite it as:
@misc{leehanchung,
author = {Lee, Hanchung},
title = {ColumbiaX Artificial Intelligence Solutions},
year = {2017},
howpublished = {Github Repo},
url = {https://github.com/leehanchung/CSMM-101x-AI}
}