Support op TF.unique

[evancasey]

It would be really great to have support for tf.unique.

This has been brought up by a number of previous issues and in general it is a very common operation that many applications rely on.

[rthadur]

@evancasey thank you , may i know your use case ?

[evancasey]

Hey @rthadur, I'm using tf.unique right now to do a type of one-hot encoding where I have an input vector with a discrete number of unique values but the values are scattered between [0,N] and N is potentially very large. I can't call tf.one_hot directly on this because I want the depth to be equal to the number of unique values.

[rthadur]

@pyu10055 any plans to support TF.unique op ?

[ClaytonSmith]

Poking this issue. There aren't any good alternatives to unique.