More tensor cores. (#2558)

* More tensor cores.

* Fixing the logic.

* Gemma is modified by this.

integration-tests/models/__snapshots__/test_flash_gemma/test_flash_gemma.json

@@ -24,13 +24,13 @@
     "tokens": [
       {
         "id": 1736,
-        "logprob": -2.03125,
+        "logprob": -2.109375,
         "special": false,
         "text": " form"
       },
       {
         "id": 109,
-        "logprob": -1.8671875,
+        "logprob": -1.90625,
         "special": false,
         "text": "\n\n"
       },
@@ -42,48 +42,48 @@
       },
       {
         "id": 2121,
-        "logprob": -1.8125,
+        "logprob": -1.796875,
         "special": false,
         "text": " test"
       },
       {
         "id": 3853,
-        "logprob": -0.24121094,
+        "logprob": -0.24511719,
         "special": false,
         "text": " request"
       },
       {
         "id": 1736,
-        "logprob": -0.100097656,
+        "logprob": -0.09326172,
         "special": false,
         "text": " form"
       },
       {
         "id": 603,
-        "logprob": -0.9453125,
+        "logprob": -0.95703125,
         "special": false,
         "text": " is"
       },
       {
-        "id": 476,
-        "logprob": -1.703125,
+        "id": 1671,
+        "logprob": -1.5859375,
         "special": false,
-        "text": " a"
+        "text": " used"
       },
       {
-        "id": 4551,
-        "logprob": -2.453125,
+        "id": 577,
+        "logprob": -0.39257812,
         "special": false,
-        "text": " document"
+        "text": " to"
       },
       {
-        "id": 674,
-        "logprob": -0.796875,
+        "id": 3853,
+        "logprob": -1.25,
         "special": false,
-        "text": " that"
+        "text": " request"
       }
     ],
     "top_tokens": null
   },
-  "generated_text": " form\n\nThe test request form is a document that"
+  "generated_text": " form\n\nThe test request form is used to request"
 }

integration-tests/models/__snapshots__/test_flash_gemma_gptq/test_flash_gemma_gptq_all_params.json

@@ -11,12 +11,12 @@
       },
       {
         "id": 2015,
-        "logprob": -9.640625,
+        "logprob": -9.6484375,
         "text": "Test"
       },
       {
         "id": 3853,
-        "logprob": -10.375,
+        "logprob": -10.3671875,
         "text": " request"
       }
     ],
@@ -24,19 +24,19 @@
     "tokens": [
       {
         "id": 604,
-        "logprob": -0.2824707,
+        "logprob": -0.28271484,
         "special": false,
         "text": " for"
       },
       {
         "id": 573,
-        "logprob": -0.19030762,
+        "logprob": -0.18493652,
         "special": false,
         "text": " the"
       },
       {
         "id": 16819,
-        "logprob": -1.4892578,
+        "logprob": -1.4804688,
         "special": false,
         "text": " detection"
       },
@@ -47,43 +47,43 @@
         "text": " of"
       },
       {
-        "id": 573,
-        "logprob": -2.0195312,
+        "id": 671,
+        "logprob": -2.1738281,
         "special": false,
-        "text": " the"
+        "text": " an"
       },
       {
-        "id": 8566,
-        "logprob": 0.0,
+        "id": 24646,
+        "logprob": -3.0449219,
         "special": false,
-        "text": " presence"
+        "text": " RNA"
       },
       {
-        "id": 689,
-        "logprob": -0.16491699,
+        "id": 12369,
+        "logprob": -0.19299316,
         "special": false,
-        "text": " or"
+        "text": " virus"
       },
       {
-        "id": 14862,
-        "logprob": 0.0,
+        "id": 575,
+        "logprob": -0.10632324,
         "special": false,
-        "text": " absence"
+        "text": " in"
       },
       {
-        "id": 576,
-        "logprob": -0.9946289,
+        "id": 6022,
+        "logprob": -0.98095703,
         "special": false,
-        "text": " of"
+        "text": " patients"
       },
       {
-        "id": 671,
-        "logprob": -0.5263672,
+        "id": 1064,
+        "logprob": -1.3095703,
         "special": false,
-        "text": " an"
+        "text": " who"
       }
     ],
     "top_tokens": null
   },
-  "generated_text": "Test request for the detection of the presence or absence of an"
+  "generated_text": "Test request for the detection of an RNA virus in patients who"
 }

server/text_generation_server/layers/attention/flashinfer.py

@@ -152,11 +152,13 @@ def create_decode_state(
 ):
     """Create a decode state."""
     workspace_buffer = get_workspace(device)
+    num_groups = num_heads // num_kv_heads
     return flashinfer.BatchDecodeWithPagedKVCacheWrapper(
         workspace_buffer,
         kv_layout="NHD",
         use_cuda_graph=False,
-        use_tensor_cores=num_heads // num_kv_heads > 4,
+        # Taken from https://github.com/flashinfer-ai/flashinfer/blob/33ef95700981ba70f4cab63b8931e562bc795b21/python/flashinfer/decode.py#L57-L60
+        use_tensor_cores=num_groups not in [1, 2, 4, 8],
     )
 
 
@@ -175,6 +177,7 @@ def create_decode_state_cuda_graphs(
     therefore stored as part of the state.
     """
     workspace_buffer = get_workspace(device)
+    num_groups = num_heads // num_kv_heads
     return flashinfer.BatchDecodeWithPagedKVCacheWrapper(
         workspace_buffer,
         kv_layout="NHD",
@@ -182,7 +185,8 @@ def create_decode_state_cuda_graphs(
         paged_kv_indices_buffer=block_tables,
         paged_kv_indptr_buffer=block_tables_ptr,
         paged_kv_last_page_len_buffer=last_page_len,
-        use_tensor_cores=num_heads // num_kv_heads > 4,
+        # Taken from https://github.com/flashinfer-ai/flashinfer/blob/33ef95700981ba70f4cab63b8931e562bc795b21/python/flashinfer/decode.py#L57-L60
+        use_tensor_cores=num_groups not in [1, 2, 4, 8],
     )