Add ColPali (#2524)

* add colpali

* cleanup

* fix clippy

candle-transformers/src/models/gemma.rs

@@ -403,7 +403,6 @@ impl Model {
             .apply(&self.norm)?
             .apply(&self.lm_head)
     }
-
     pub fn forward_embeds(
         &mut self,
         xs: &Tensor,
@@ -420,6 +419,21 @@ impl Model {
             .apply(&self.lm_head)
     }
 
+    // Forward the model and return the hidden states without the lm_head
+    pub fn forward_embeds_without_projection(
+        &mut self,
+        xs: &Tensor,
+        attn_mask: Option<&Tensor>,
+        seqlen_offset: usize,
+    ) -> Result<Tensor> {
+        let (_, _, _) = xs.dims3()?;
+        let mut xs = (xs * (self.hidden_size as f64).sqrt())?;
+        for layer in self.layers.iter_mut() {
+            xs = layer.forward(&xs, attn_mask, seqlen_offset)?
+        }
+        Ok(xs)
+    }
+
     pub fn clear_kv_cache(&mut self) {
         for layer in self.layers.iter_mut() {
             layer.clear_kv_cache()