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The following is a simple, wellknown method for enforcing invertibility:
With pattern ,
a reconstructor module receives the concatenation of all
as an input
and is trained to emit as an output the reconstruction
of the external input .
The basic structure is an auto encoder.
The auto encoder's objective function, to be minimized, is defined as

(3) 
Juergen Schmidhuber
20030213
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