Source code for pyCP_APR.numpy_backend.double_ktensor

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Python implementation of double utility with Numpy backend from the MATLAB Tensor Toolbox [1].

References
========================================
[1] General software, latest release: Brett W. Bader, Tamara G. Kolda and others, Tensor Toolbox for MATLAB, Version 3.2.1, www.tensortoolbox.org, April 5, 2021.\n
"""

import numpy as np
from . khatrirao_ktensor import khatrirao

[docs]def double(M): """ This function converts the KTENSOR M to a double array. Parameters ---------- M : object KRUSKAL tensor class. ktensor.K_TENSOR. Returns ------- A : array Double array of M. """ sz = M.Size nn = [str(x) for x in reversed(range(0, M.Dimensions))] A = np.dot(M.Weights.T, khatrirao(M, nn).T) A = np.reshape(A, sz) return A