Merge pull request #75 from casper-hansen/fix_runtime

Fix KV cache shapes error

awq/modules/fused/attn.py

@@ -80,12 +80,32 @@ class QuantAttentionFused(nn.Module):
         self.start_pos = 0
         self.use_alibi = use_alibi
         self.cache_batch_size = int(os.getenv("AWQ_BATCH_SIZE", "1"))
+        self.max_seq_len = max_seq_len
+        self.attention_shapes = self._get_attention_shapes(attention_shapes, max_seq_len)
+        self.cache_v = ( torch.zeros(self.attention_shapes["cache_v"]).to(dev).half() )
+        self.cache_k = ( torch.zeros(self.attention_shapes["cache_k"]).to(dev).half() )
 
+        if use_alibi:
+            alibi_slopes, alibi_bias = build_alibi_bias(self.n_heads, max_seq_len)
+            self.alibi_slopes = alibi_slopes.float().to(dev)
+            self.alibi_bias = alibi_bias.float().to(dev)
+            self.rotary_dim = 0
+            self.is_neox = False
+        else:
+            self.freqs_cis = precompute_freqs_cis(
+                hidden_size // n_heads,
+                max_seq_len * 2,
+            ).to(dev)
+            self.rotary_dim = self.head_dim
+            self.alibi_slopes = None
+            self.is_neox = True
+    
+    def _get_attention_shapes(self, attention_shapes, max_seq_len):
         if attention_shapes is not None:
-            self.attention_shapes = attention_shapes
+            attention_shapes = attention_shapes
 
         elif self.n_kv_heads == 0:
-            self.attention_shapes = {
+            attention_shapes = {
                 # following fastertransformer definition
                 "cache_v": (self.cache_batch_size, self.n_heads, max_seq_len, self.head_dim,),
                 # 8: pack 8 fp16 in FT, if fp32 then use 4
@@ -104,7 +124,7 @@ class QuantAttentionFused(nn.Module):
             }
 
         else:
-            self.attention_shapes = {
+            attention_shapes = {
                 # following fastertransformer definition
                 "cache_v": (self.cache_batch_size, self.n_kv_heads, max_seq_len, self.head_dim,),
                 # 8: pack 8 fp16 in FT, if fp32 then use 4
@@ -122,32 +142,11 @@ class QuantAttentionFused(nn.Module):
                 "single_xv_view": (self.n_kv_heads, self.head_dim)
             }
         
-        self.cache_v = (
-            torch.zeros(self.attention_shapes["cache_v"]).to(dev).half()
-        )
-        
-        self.cache_k = (
-            torch.zeros(self.attention_shapes["cache_k"]).to(dev).half()
-        )
-
-        if use_alibi:
-            alibi_slopes, alibi_bias = build_alibi_bias(self.n_heads, max_seq_len)
-            self.alibi_slopes = alibi_slopes.float().to(dev)
-            self.alibi_bias = alibi_bias.float().to(dev)
-            self.rotary_dim = 0
-            self.is_neox = False
-        else:
-            self.freqs_cis = precompute_freqs_cis(
-                hidden_size // n_heads,
-                max_seq_len * 2,
-            ).to(dev)
-            self.rotary_dim = self.head_dim
-            self.alibi_slopes = None
-            self.is_neox = True
+        return attention_shapes
     
     def forward(
         self,
-        hidden_states, past_key_value=None, attention_mask=None, position_ids=None, output_attentions=False, use_cache=False
+        hidden_states:torch.Tensor, past_key_value=None, attention_mask=None, position_ids=None, output_attentions=False, use_cache=False
     ):
         bsz, seqlen, _ = hidden_states.shape
         if bsz != self.cache_batch_size:
@@ -155,6 +154,17 @@ class QuantAttentionFused(nn.Module):
                 f"Batch size is incorrectly set - input batch size {bsz}, kv-cache batch size {self.cache_batch_size}. "
                 f"Use: AutoAWQForCausalLM.from_quantized(batch_size={bsz})"
             )
+
+        if self.start_pos > self.max_seq_len or self.start_pos + seqlen > self.max_seq_len:
+            # Roll cache to the left
+            roll_len = self.start_pos
+            self.cache_v = torch.roll(self.cache_v, shifts=-roll_len, dims=2)
+            self.cache_k = torch.roll(self.cache_k, shifts=-roll_len, dims=3)
+            # Zero out the new part
+            self.cache_v[:, :, -roll_len:, :] = 0
+            self.cache_k[:, :, :, -roll_len:, :] = 0
+            self.start_pos = 0
+            
         xqkv = self.qkv_proj(hidden_states)
         xqkv = xqkv.view((bsz, seqlen) + self.attention_shapes["xqkv_view"])
         

awq/utils/utils.py

@@ -60,3 +60,8 @@ def clear_memory(weight=None):
         del weight
     gc.collect()
     torch.cuda.empty_cache()
+
+def compute_memory_used_pct(device):
+    memory_used = torch.cuda.max_memory_allocated(device) / (1024 ** 3)
+    memory_pct = memory_used / (torch.cuda.get_device_properties(device).total_memory / (1024 ** 3)) * 100
+    return memory_pct
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