code: def __call__(self, a, b):
      shape = (
          (a.shape[1],)
          if len(b.shape) == 1
          else (a.shape[1], b.shape[1])
      )
      return self.new_tensor([a, b], shape, order=TensorOrder.F_ORDER)
  
imports: import numpy
  from numpy.linalg import LinAlgError
  from ...None import opcodes
  from ...core import recursive_tile
  from ...serialization.serializables import BoolField, KeyField
  from ...utils import has_unknown_shape
  from ..array_utils import device, as_same_device, cp
  from ..operands import TensorOperand, TensorOperandMixin
  from ..datasource import tensor
  from ..utils import decide_unify_split
  from ..core import TensorOrder
label_desc: Use image node_id 6 for calling the TensorSolveTriangular obj's underlying member method code with example usage: obj.__call__(a, b) and returns: self