Add support for .fvces files combined with .ivces files
The .fvces + .ivces stores labels and embedding vectors separately. For instance: .fvces: 3 2 1.0072038173675537 0.6627578735351562 2.4324381351470947 1.5512933731079102 2.435966968536377 0.0
.ivces: word of embedding
This file format needs to be supported.