Is rotation matrix defined correctly in dataset.py?

Line 182 in f0c2430

    
           rotation_matrix = np.array([[np.cos(theta), -np.sin(theta)], [np.sin(theta), np.cos(theta)]])

I understand this rotation matrix for data argumentation. Thus, theta and -theta might function the same. Logically, if we are doing pc.dot(rotation matrix), I guess we need to transpose the rotation_matrix in the original code?