Data transformers apply transformations to data. Note that the transformations are limited to simple, in-place operations that do not change the shape of the data. If more complicated transformations like random projection or feature mapping are needed, consider using a data transformation layer instead.
Subtract mean from the data. The transformer does not have enough information to compute the data mean, thus the mean should be computed in advance.
NullBlob(). A blob containing the mean.
NullBlob, this can be used to specify a HDF5 file containing the mean. The mean should be stored with the name
meanin the HDF5 file.