Quote:
Originally Posted by pouramini
Thank you, yes that seems helpful if we regard all points in Z space, but I thought it speaks about the points in Z which are the mapping of a point in data set D.

Hm, in my understanding, the quote "some points in the
Z space may not be valid transforms of any x E X" regards all the points in the Z space. For example: If
, then the point
in the Z space cannot be a valid transform of any
.