new_contents: import warnings
  
  warnings.warn("pylearn2.pca has been moved to pylearn2.models.pca and "
      "will be removed from the library on or after Aug 24, 2014.")
  
  # Make sure old import statements still work
  from models.pca import SparseMatPCA
  from models.pca import OnlinePCA
  from models.pca import Cov
  from models.pca import CovEigPCA
  from models.pca import SVDPCA
  from models.pca import SparsePCA
  from models.pca import PcaOnlineEstimator
  
subject: replace old pca.py with indirection file