T3Frame.stack

static t3toolbox.frame_variations_format.T3Frame.stack(xx)

def stack(
        xx, # Array-like tree of T3Frame
):

Stack array-like tree of T3Frame into a single T3Frame.

Examples

>>> import numpy as np
>>> import t3toolbox.frame_variations_format as bvf
>>> import t3toolbox.corewise as cw
>>> np.random.seed(0)
>>> rnd = lambda x: np.random.randn(*x)
>>> ss = (2, 3)                                   # stack C
>>> up_tucker_cores = (rnd(ss+(10, 14)), rnd(ss+(11, 15)), rnd(ss+(12, 16)))
>>> down_tt_cores = (rnd(ss+(1, 9, 4)), rnd(ss+(2, 8, 5)), rnd(ss+(3, 7, 1)))
>>> left_tt_cores = (rnd(ss+(1, 10, 2)), rnd(ss+(2, 11, 3)), rnd(ss+(3, 12, 5)))
>>> right_tt_cores = (rnd(ss+(2, 10, 4)), rnd(ss+(4, 11, 5)), rnd(ss+(5, 12, 1)))
>>> x = bvf.T3Frame(up_tucker_cores, down_tt_cores, left_tt_cores, right_tt_cores)
>>> x2 = bvf.T3Frame.stack(x.unstack())           # stack is the inverse of unstack
>>> print(np.allclose(cw.corewise_norm(cw.corewise_sub(x.data, x2.data)), 0.0))
True