def adata():
    adata = ad.AnnData(np.zeros((100, 100)))
    adata.obsm["o"] = np.zeros((100, 50))
    adata.varm["o"] = np.zeros((100, 50))
    return adata
def chunkstring(s, n):
    return [ s[i:i+n] for i in xrange(0, len(s), n) ]