Clean-up the llama2.c wasm example.

candle-wasm-examples/llama2-c/src/lib.rs

@@ -1,28 +1,3 @@
-#![allow(dead_code)]
-
-pub const WITH_TIMER: bool = true;
-
-struct Timer {
-    label: &'static str,
-}
-
-impl Timer {
-    fn new(label: &'static str) -> Self {
-        if WITH_TIMER {
-            web_sys::console::time_with_label(label);
-        }
-        Self { label }
-    }
-}
-
-impl Drop for Timer {
-    fn drop(&mut self) {
-        if WITH_TIMER {
-            web_sys::console::time_end_with_label(self.label)
-        }
-    }
-}
-
 mod app;
 mod model;
 mod worker;

candle-wasm-examples/llama2-c/src/model.rs

@@ -106,14 +106,15 @@ struct CausalSelfAttention {
     n_key_value_head: usize,
     head_dim: usize,
     cache: Cache,
-    max_seq_len: usize,
 }
 
 impl CausalSelfAttention {
     fn apply_rotary_emb(&self, x: &Tensor, index_pos: usize) -> Result<Tensor> {
         let (b_sz, seq_len, h, n_embd) = x.dims4()?;
-        let cos = self.cache.cos.narrow(0, index_pos, seq_len)?;
-        let sin = self.cache.sin.narrow(0, index_pos, seq_len)?;
+        let cos = self.cache.cos.i(index_pos..index_pos + seq_len)?;
+        let sin = self.cache.sin.i(index_pos..index_pos + seq_len)?;
+        let cos = cos.unsqueeze(1)?;
+        let sin = sin.unsqueeze(1)?;
         let cos = cos.broadcast_as((b_sz, seq_len, 1, n_embd / 2, 1))?;
         let sin = sin.broadcast_as((b_sz, seq_len, 1, n_embd / 2, 1))?;
         let x = x.reshape((b_sz, seq_len, h, n_embd / 2, 2))?;
@@ -196,7 +197,6 @@ impl CausalSelfAttention {
             n_key_value_head: cfg.n_kv_heads,
             head_dim: cfg.dim / cfg.n_heads,
             cache: cache.clone(),
-            max_seq_len: cfg.seq_len,
         })
     }
 }