/usr/lib/python2.7/dist-packages/mdp/nodes/ is in python-mdp 3.5-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/mdp/nodes/__init__.py
/usr/lib/python2.7/dist-packages/mdp/nodes/classifier_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/convolution_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/em_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/expansion_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/fda_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/ica_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/isfa_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/jade.py
/usr/lib/python2.7/dist-packages/mdp/nodes/libsvm_classifier.py
/usr/lib/python2.7/dist-packages/mdp/nodes/lle_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/misc_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/neural_gas_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/nipals.py
/usr/lib/python2.7/dist-packages/mdp/nodes/pca_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/rbm_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/regression_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/scikits_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/sfa_nodes.py
/usr/lib/python2.7/dist-packages/mdp/nodes/shogun_svm_classifier.py
/usr/lib/python2.7/dist-packages/mdp/nodes/svm_classifiers.py
/usr/lib/python2.7/dist-packages/mdp/nodes/xsfa_nodes.py