The name of variable in cellMeta slot to store the
dimensionality reduction matrix, which originally located in
tsne.coords slot. Default "tsne.coords".
clusterName
The name of variable in cellMeta slot to store the
clustering assignment, which originally located in clusters slot.
Default "clusters".
h5FilePath
Named list, to specify the path to the H5 file of each
dataset if location has been changed. Default NULL looks at the file
paths stored in object.