One-hot vectors encoding with NetEncoder

Question

I have a text and vocabulary (text has two "the" entries):

list = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"}
voc =  {"the", "quick", "brown", "fox", "jumps", "over", "lazy", "dog"}

And I can do integer codes with NetEncoder.

NetEncoder[{"Tokens", voc}][list]

{{1}, {2}, {3}, {4}, {5}, {6}, {1}, {7}, {8}}

But for NetEncoder["Tokens"] documentation states the following:

"Tokens" -> encode tokens in a string as a sequence of integer codes or one-hot vectors

What is the correct way to implement one-hot vectors? (I'm on WM 11.3)

---

P.S. One may do one-hot vectors encoding manually, but I need the way compatible with NetTrain functionality:

Thread[voc -> IdentityMatrix[Length[voc]]]

{"the" -> {1, 0, 0, 0, 0, 0, 0, 0}, "quick" -> {0, 1, 0, 0, 0, 0, 0, 0}, "brown" -> {0, 0, 1, 0, 0, 0, 0, 0}, "fox" -> {0, 0, 0, 1, 0, 0, 0, 0}, "jumps" -> {0, 0, 0, 0, 1, 0, 0, 0}, "over" -> {0, 0, 0, 0, 0, 1, 0, 0}, "lazy" -> {0, 0, 0, 0, 0, 0, 1, 0}, "dog" -> {0, 0, 0, 0, 0, 0, 0, 1}}

Answer 1

The "Class" NetEncoder outputs one-hot vectors when the "UnitVector" form is specified:

NetEncoder[{"Class", voc, "UnitVector"}][list]    

{1,0,0,0,0,0,0,0},{0,1,0,0,0,0,0,0},{0,0,1,0,0,0,0,0},

{0,0,0,1,0,0,0,0},{0,0,0,0,1,0,0,0},{0,0,0,0,0,1,0,0},

{1,0,0,0,0,0,0,0},{0,0,0,0,0,0,1,0},{0,0,0,0,0,0,0,1}}