code: def qvec2rotmat(self):
      return qvec2rotmat(self.qvec)
  
file_path: gaussian-splatting/scene/colmap_loader.py
imports: import numpy
  import collections
  import struct
label_desc: Use image node_id 1 for calling the Image obj's underlying member method code with example usage: obj.qvec2rotmat() and returns: qvec2rotmat