Yehyun/model/data preprocessing

[yehyunsuh]

Motivation 🤔

• Enhancement

Key Changes 🔑

• Data downloading/preprocessing
• White color classification

To Reviewers 🙏

• No conflicts

resolves: references: #7 #31 #42

[seoulsky-field]

LGTM. (I'll send a request message about my branch PR as soon as possible)