gray scale and rgb scale compatability

detection(with boxes) and classification(with label) compatability

cpp and python framework

• flip (vertical and horizontal done)
• rotate 90 degree
• distort/color jitter
• expand
• random crop
• clip bbox to border
• resize
• stable resize (keep width/height ratio unchanged)
• data validation check
• data format convert, Tensor to numpy in pyTorch, tf.Variable to numpy in Tensorflow, etc.
• check data batch and display
• Basic format for test
• cpp data augmentation framework