split and load arrays to a list of contexts

def split_and_load(arrs, ctx):
    """split and load arrays to a list of contexts"""
    assert isinstance(arrs, (list, tuple))
    # split and load
    loaded_arrs = [mx.gluon.utils.split_and_load(arr, ctx, even_split=False) for arr in arrs]
    return zip(*loaded_arrs)