t3toolbox.weighted_tucker_tensor_train.wt3_sub
==============================================

.. py:function:: t3toolbox.weighted_tucker_tensor_train.wt3_sub(A: WeightedTuckerTensorTrain, B: WeightedTuckerTensorTrain, squash: bool = True, use_jax: bool = False) -> WeightedTuckerTensorTrain

   Subtract two weighted Tucker tensor trains, A-B.

   .. rubric:: Examples

   >>> import numpy as np
   >>> import t3toolbox.tucker_tensor_train as t3
   >>> import t3toolbox.weighted_tucker_tensor_train as wt3
   >>> randn = np.random.randn
   >>> x0 = t3.t3_corewise_randn((6,7,8), (5,6,7), (2,3,3,1), stack_shape=(4,))
   >>> x_tucker_vectors = tuple([randn(4, 5), randn(4, 6), randn(4, 7)])
   >>> x_tt_vectors = tuple([randn(4, 2), randn(4, 3), randn(4, 3), randn(4, 1)])
   >>> x_weights = wt3.EdgeVectors(x_tucker_vectors, x_tt_vectors)
   >>> x = wt3.WeightedTuckerTensorTrain(x0, x_weights)
   >>> y0 = t3.t3_corewise_randn((6,7,8), (2,4,2), (1,3,1,2), stack_shape=(4,))
   >>> y_tucker_vectors = tuple([randn(4, 2), randn(4, 4), randn(4, 2)])
   >>> y_tt_vectors = tuple([randn(4, 1), randn(4, 3), randn(4, 1), randn(4, 2)])
   >>> y_weights = wt3.EdgeVectors(y_tucker_vectors, y_tt_vectors)
   >>> y = wt3.WeightedTuckerTensorTrain(y0, y_weights)
   >>> x_minus_y = wt3.wt3_sub(x, y)
   >>> x_dense = x.contract_edge_weights_into_cores().to_dense()
   >>> y_dense = y.contract_edge_weights_into_cores().to_dense()
   >>> x_minus_y_dense = x_minus_y.contract_edge_weights_into_cores().to_dense()
   >>> print(np.linalg.norm(x_dense - y_dense - x_minus_y_dense))
   1.8944706560546762e-13