code: def lstsq(a, b, rcond=None, driver="gelsd"):
      return torch.linalg.lstsq(a, b, rcond=rcond, driver=driver)
  
imports: from packaging.version import Version
  import numpy
  from .core import Backend, backend_types, backend_basic_math, backend_array
label_desc: Use image node_id 26 for calling the PyTorchBackend obj's underlying member method code with example usage: obj.lstsq(a, b, rcond, driver) and returns: torch