new embedding label type in image input op (#16835)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16835
We were using label type `multi_label_dense` to denote both 1) dense representation of integer label 2) embedding label of data type floating number.
This cause some issues as two cases have different assumption, such as for integer label, we will check whether label value is in [0, number_class - 1]. But such check should be skipped for `embedding label`.
Reviewed By: BIT-silence
Differential Revision: D13985048
fbshipit-source-id: 1202cdfeea806eb47647e3f4a1ed9c104f72ad2c
