t3toolbox.OLD_uniform.ut3_neg

t3toolbox.OLD_uniform.ut3_neg(x_cores: UniformTuckerTensorTrain, use_jax: bool = False) → UniformTuckerTensorTrain

Flip a uniform Tucker tensor train, x -> -x.

Parameters:

x_cores (UniformTuckerTensorTrainCores) – Original uniform Tucker tensor train cores

Returns:

Cores for flipped uniform Tucker tensor train, -x

Return type:

UniformTuckerTensorTrainCores

Examples

>>> import numpy as np
>>> import t3toolbox.tucker_tensor_train as t3
>>> import t3toolbox.uniform_tucker_tensor_train as ut3
>>> x = t3.t3_corewise_randn(((14,15,16), (4,6,5), (2,3,2,2)))
>>> cores, masks = ut3.t3_to_ut3(x)
>>> neg_cores = ut3.ut3_neg(cores) # flip x
>>> dense_x = t3.t3_to_dense(x)
>>> dense_neg_x = ut3.ut3_to_dense(neg_cores, masks)
>>> print(np.linalg.norm(-dense_x - dense_neg_x))
0.0