Maps the native PLS result fields (u, s, v, usc, vsc) to the universal
mva_decomposition / mva_result shape. The original pls_result fields
are preserved in extra for backward compatibility.
Arguments
- pls_res
A
pls_resultobject frompls_analysis()- spec
The spec used (optional, for metadata)
- method_name
Character, method name for class dispatch