code: def __call__(self, ta, tb=None, return_U=False, return_A=False):
      raise NotImplementedError
  
file_path: torchsde/torchsde/_brownian/brownian_base.py
imports: import abc
label_desc: Use image node_id 1 for calling the BaseBrownian obj's underlying member method code with example usage: obj.__call__(ta, tb, return_U, return_A) without return types