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//! Embedding Layer.
use candle::{Result, Tensor};
#[derive(Clone, Debug)]
pub struct Embedding {
embeddings: Tensor,
hidden_size: usize,
}
impl Embedding {
pub fn new(embeddings: Tensor, hidden_size: usize) -> Self {
Self {
embeddings,
hidden_size,
}
}
pub fn embeddings(&self) -> &Tensor {
&self.embeddings
}
/// Get the hidden size of the embedding matrix
pub fn hidden_size(&self) -> usize {
self.hidden_size
}
}
impl crate::Module for Embedding {
fn forward(&self, indexes: &Tensor) -> Result<Tensor> {
let mut final_dims = indexes.dims().to_vec();
final_dims.push(self.hidden_size);
let indexes = indexes.flatten_all()?;
let values = self.embeddings.index_select(&indexes, 0)?;
let values = values.reshape(final_dims)?;
Ok(values)
}
}
pub fn embedding(in_size: usize, out_size: usize, vb: crate::VarBuilder) -> Result<Embedding> {
let embeddings = vb.get_with_hints(
(in_size, out_size),
"weight",
crate::Init::Randn {
mean: 0.,
stdev: 1.,
},
)?;
Ok(Embedding::new(embeddings, out_size))
}
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