class_docstr: Class for the  backend.
  
  Parameter
  ---------
  data : array-like or string or None
      Indicates the backend to choose.
      If data is a Numpy array or data equals 'numpy' or data is None,
      self.backend is set to NumpyBackend().
      If data is a PyTorch array or data equals 'pytorch',
      self.backend is set to PytorchBackend().
      Optional, default equals None.
code: def get_backend(self):
      return self.backend
  
file_path: tslearn/tslearn/backend/backend.py
imports: from tslearn.backend.numpy_backend import NumPyBackend
label_desc: Use image node_id 2 for calling the Backend obj's underlying member method code with example usage: obj.get_backend() and returns: self