AFNI CatMatvec: Caching fails and output file undefined

[salma1601]

Summary

AFNI CatMatvec interface caching fails and output file is undefined

How to replicate the behavior

from nipype.interfaces import afni
from nipype.caching import Memory
memory = Memory('/tmp/test_catmatvec/')
catmatvec = memory.cache(afni.CatMatvec)
out_catmatvec = catmatvec(in_file=[('/tmp/test_caching/allineate_affine.aff12.1D', 'ONELINE')], out_file='/tmp/test_catmatvec2.aff12.1D')
print(out_catmatvec.outputs)

gives out_file = <undefined>. Moreover, when launching the same code twice the computations are restarted

Platform details:

{'nibabel_version': '2.2.1', 'sys_executable': '/home/salma/anaconda2/bin/python', 'networkx_version': '2.0', 'numpy_version': '1.13.3', 'sys_platform': 'linux2', 'sys_version': '2.7.14 |Anaconda custom (64-bit)| (default, Oct 16 2017, 17:29:19) \n[GCC 7.2.0]', 'commit_source': 'repository', 'commit_hash': 'e446466', 'pkg_path': '/home/salma/CODE/nipype/nipype', 'nipype_version': '1.0.3-dev+ge446466', 'traits_version': '4.6.0', 'scipy_version': '1.0.0'}
1.0.3-dev+ge446466