in python/mxboard/utils.py [0:0]
def _is_2D_matrix(matrix):
"""Checks to see if a ndarray is 2D or a list of lists is 2D"""
return ((isinstance(matrix[0], list) and _rectangular(matrix) and
not isinstance(matrix[0][0], list)) or
(not isinstance(matrix, list) and matrix.shape == 2))