These five subdirectories have intermediate output for forming the ChromImpute ChIP-seq imputed data and WGBS DNA Methylation.
The final data for each is available in bigWig format. In addition DNA methylation imputed data is also available in a grid format.

The sub-directories for intermediate outputs are as follows:
CONVERT_EPIATLAS - contains the output of the Convert command of ChromImpute (not used for DNA Methylation)
DISTANCEDIR_EPIATLAS - contains the output of the ComputeGlobalDist command of ChromImpute
TRAINDATADIR_EPIATLAS - contains the output of the GenerateTrainData command of ChromImpute
PREDICTORDIR_EPIATLAS - contains the output of the Train command of ChromImpute
OUTPUTDATA_EPIATLAS_TIEGLOBAL - contains the output of the Apply command of ChromImpute 

Additional information for each of these commands can be found in the ChromImpute manual available at https://ernstlab.biolchem.ucla.edu/ChromImpute/

Additional information about ChromImpute can be found in:
Ernst J, Kellis M. Large-scale imputation of epigenomic datasets for systematic annotation of diverse human tissues. Nature Biotechnology, 33:364-376, 2015.

Contact Jason Ernst (jason.ernst@ucla.edu) with any questions about the imputed data.