Deepseek V3 support (#364)

gshtras · charlifu · web-flow · commit c5a9406b8915 · 2025-01-16T15:18:04.000-05:00
* Changing the hard coded datatype to see if it's enough for the model to work

* Picking the upstrteam moe kernel version

* make upstream fix for v3 also works for rocm v2

* Conditional fnuz dtype

* Requantizing from fn to fnuz

* Requantizing moe as well

* Actually requantizing moe weights

* Conditional requantization and assert on padding in block quant

* Format

---------

Co-authored-by: charlifu &lt;charlifu@amd.com&gt;
diff --git a/csrc/moe/moe_align_sum_kernels.cu b/csrc/moe/moe_align_sum_kernels.cu
@@ -55,11 +55,11 @@ __global__ void moe_align_block_size_kernel(scalar_t* __restrict__ topk_ids,
   __syncthreads();
 
   // For each expert we accumulate the token counts from the different threads.
-  for (int eid = threadIdx.x; eid < num_experts; eid += blockDim.x) {
-    tokens_cnts[index(num_experts, 0, eid)] = 0;
+  if (threadIdx.x < num_experts) {
+    tokens_cnts[index(num_experts, 0, threadIdx.x)] = 0;
     for (int i = 1; i <= blockDim.x; ++i) {
-      tokens_cnts[index(num_experts, i, eid)] +=
-          tokens_cnts[index(num_experts, i - 1, eid)];
+      tokens_cnts[index(num_experts, i, threadIdx.x)] +=
+          tokens_cnts[index(num_experts, i - 1, threadIdx.x)];
     }
   }
 
@@ -83,9 +83,10 @@ __global__ void moe_align_block_size_kernel(scalar_t* __restrict__ topk_ids,
    * For each expert, each thread processes the tokens of the corresponding
    * blocks and stores the corresponding expert_id for each block.
    */
-  for (int eid = threadIdx.x; eid < num_experts; eid += blockDim.x) {
-    for (int i = cumsum[eid]; i < cumsum[eid + 1]; i += block_size) {
-      expert_ids[i / block_size] = eid;
+  if (threadIdx.x < num_experts) {
+    for (int i = cumsum[threadIdx.x]; i < cumsum[threadIdx.x + 1];
+         i += block_size) {
+      expert_ids[i / block_size] = threadIdx.x;
     }
   }
 
@@ -140,11 +141,11 @@ __global__ void moe_align_block_size_global_mem_kernel(
   __syncthreads();
 
   // For each expert we accumulate the token counts from the different threads.
-  for (int eid = threadIdx.x; eid < num_experts; eid += blockDim.x) {
-    tokens_cnts[index(num_experts, 0, eid)] = 0;
+  if (threadIdx.x < num_experts) {
+    tokens_cnts[index(num_experts, 0, threadIdx.x)] = 0;
     for (int i = 1; i <= blockDim.x; ++i) {
-      tokens_cnts[index(num_experts, i, eid)] +=
-          tokens_cnts[index(num_experts, i - 1, eid)];
+      tokens_cnts[index(num_experts, i, threadIdx.x)] +=
+          tokens_cnts[index(num_experts, i - 1, threadIdx.x)];
     }
   }
 
@@ -168,9 +169,10 @@ __global__ void moe_align_block_size_global_mem_kernel(
    * For each expert, each thread processes the tokens of the corresponding
    * blocks and stores the corresponding expert_id for each block.
    */
-  for (int eid = threadIdx.x; eid < num_experts; eid += blockDim.x) {
-    for (int i = cumsum[eid]; i < cumsum[eid + 1]; i += block_size) {
-      expert_ids[i / block_size] = eid;
+  if (threadIdx.x < num_experts) {
+    for (int i = cumsum[threadIdx.x]; i < cumsum[threadIdx.x + 1];
+         i += block_size) {
+      expert_ids[i / block_size] = threadIdx.x;
     }
   }
 
@@ -221,25 +223,61 @@ void moe_align_block_size(torch::Tensor topk_ids, int64_t num_experts,
                           torch::Tensor experts_ids,
                           torch::Tensor num_tokens_post_pad) {
   const cudaStream_t stream = at::cuda::getCurrentCUDAStream();
-  VLLM_DISPATCH_INTEGRAL_TYPES(
-      topk_ids.scalar_type(), "moe_align_block_size_kernel", [&] {
-        // calc needed amount of shared mem for `tokens_cnts` and `cumsum`
-        // tensors
-        const int32_t num_thread = WARP_SIZE;
-        const int32_t shared_mem =
-            ((num_thread + 1) * num_experts + (num_experts + 1)) *
-            sizeof(int32_t);
-
-        // set dynamic shared mem
-        auto kernel = vllm::moe::moe_align_block_size_kernel<scalar_t>;
-        AT_CUDA_CHECK(VLLM_DevFuncAttribute_SET_MaxDynamicSharedMemorySize(
-            (void*)kernel, shared_mem));
-        kernel<<<1, num_thread, shared_mem, stream>>>(
-            topk_ids.data_ptr<scalar_t>(), sorted_token_ids.data_ptr<int32_t>(),
-            experts_ids.data_ptr<int32_t>(),
-            num_tokens_post_pad.data_ptr<int32_t>(), num_experts, block_size,
-            topk_ids.numel());
-      });
+
+  // If we have very large number of experts, we can no longer use shared
+  // memory.
+  // TODO(simon): the right solution should be calculating the exact right
+  // amount of shared memory and use that. The num_experts >= 256 is just a
+  // temporary solution to unblock Deepseek V3.
+  if (num_experts >= 96) {
+    VLLM_DISPATCH_INTEGRAL_TYPES(
+        topk_ids.scalar_type(), "moe_align_block_size_global_mem_kernel", [&] {
+          // calc needed amount of shared mem for `tokens_cnts` and `cumsum`
+          // tensors
+          const int32_t num_thread = max((int32_t)num_experts, WARP_SIZE);
+
+          const int32_t mem_tokens_cnts =
+              ((num_experts + 1) * num_experts) * sizeof(int32_t);
+          const int32_t mem_cumsum = (num_experts + 1) * sizeof(int32_t);
+          // allocate global memory
+          int32_t* tokens_cnts;
+          int32_t* cumsum;
+          cudaMalloc(&tokens_cnts, mem_tokens_cnts);
+          cudaMalloc(&cumsum, mem_cumsum);
+
+          auto kernel =
+              vllm::moe::moe_align_block_size_global_mem_kernel<scalar_t>;
+          kernel<<<1, num_thread, 0, stream>>>(
+              topk_ids.data_ptr<scalar_t>(),
+              sorted_token_ids.data_ptr<int32_t>(),
+              experts_ids.data_ptr<int32_t>(),
+              num_tokens_post_pad.data_ptr<int32_t>(), num_experts, block_size,
+              topk_ids.numel(), tokens_cnts, cumsum);
+          cudaFree(tokens_cnts);
+          cudaFree(cumsum);
+        });
+  } else {
+    VLLM_DISPATCH_INTEGRAL_TYPES(
+        topk_ids.scalar_type(), "moe_align_block_size_kernel", [&] {
+          // calc needed amount of shared mem for `tokens_cnts` and `cumsum`
+          // tensors
+          const int32_t num_thread = max((int32_t)num_experts, WARP_SIZE);
+          const int32_t shared_mem =
+              ((num_thread + 1) * num_experts + (num_experts + 1)) *
+              sizeof(int32_t);
+
+          // set dynamic shared mem
+          auto kernel = vllm::moe::moe_align_block_size_kernel<scalar_t>;
+          AT_CUDA_CHECK(VLLM_DevFuncAttribute_SET_MaxDynamicSharedMemorySize(
+              (void*)kernel, shared_mem));
+          kernel<<<1, num_thread, shared_mem, stream>>>(
+              topk_ids.data_ptr<scalar_t>(),
+              sorted_token_ids.data_ptr<int32_t>(),
+              experts_ids.data_ptr<int32_t>(),
+              num_tokens_post_pad.data_ptr<int32_t>(), num_experts, block_size,
+              topk_ids.numel());
+        });
+  }
 }
 
 void moe_sum(torch::Tensor& input,   // [num_tokens, topk, hidden_size]
diff --git a/vllm/model_executor/layers/quantization/fp8.py b/vllm/model_executor/layers/quantization/fp8.py
@@ -166,6 +166,8 @@ def create_weights(
         weight_loader = extra_weight_attrs.get("weight_loader")
 
         if self.block_quant:
+            assert not envs.VLLM_FP8_PADDING, (
+                "FP8 weight padding is not supported in block quantization.")
             tp_size = get_tensor_model_parallel_world_size()
             assert self.quant_config.weight_block_size is not None
             block_n, block_k = (
@@ -196,8 +198,9 @@ def create_weights(
         layer.output_size_per_partition = output_size_per_partition
         layer.orig_dtype = params_dtype
 
+        fp8_dtype = torch.float8_e4m3fn
         # WEIGHT
-        weight_dtype = (torch.float8_e4m3fn
+        weight_dtype = (fp8_dtype
                         if self.quant_config.is_checkpoint_fp8_serialized else
                         params_dtype)
 
@@ -252,6 +255,15 @@ def create_weights(
     def process_weights_after_loading(self, layer: Module) -> None:
         # Block quant doesn't need to process weights after loading
         if self.block_quant:
+            if current_platform.is_rocm() and not is_navi():
+                weight, weight_scale, _ = \
+                    normalize_e4m3fn_to_e4m3fnuz(
+                        weight=layer.weight,
+                        weight_scale=layer.weight_scale_inv,
+                        input_scale=layer.input_scale)
+                layer.weight = Parameter(weight, requires_grad=False)
+                layer.weight_scale_inv = Parameter(weight_scale,
+                                                   requires_grad=False)
             return
         layer.weight = torch.nn.Parameter(layer.weight.data,
                                           requires_grad=False)
@@ -512,6 +524,30 @@ def create_weights(self, layer: Module, num_experts: int, hidden_size: int,
     def process_weights_after_loading(self, layer: Module) -> None:
         # Block quant doesn't need to process weights after loading
         if self.block_quant:
+            if current_platform.is_rocm() and not is_navi():
+                w13_weight, w13_weight_scale_inv, w13_input_scale = \
+                    normalize_e4m3fn_to_e4m3fnuz(
+                        layer.w13_weight, layer.w13_weight_scale_inv,
+                        layer.w13_input_scale)
+                w2_weight, w2_weight_scale_inv, w2_input_scale = \
+                    normalize_e4m3fn_to_e4m3fnuz(
+                        layer.w2_weight, layer.w2_weight_scale_inv,
+                        layer.w2_input_scale)
+                # Reset the parameter
+                layer.w13_weight = torch.nn.Parameter(w13_weight,
+                                                      requires_grad=False)
+                layer.w13_weight_scale_inv = torch.nn.Parameter(
+                    w13_weight_scale_inv, requires_grad=False)
+                if w13_input_scale is not None:
+                    layer.w13_input_scale = torch.nn.Parameter(
+                        w13_input_scale, requires_grad=False)
+                layer.w2_weight = torch.nn.Parameter(w2_weight,
+                                                     requires_grad=False)
+                layer.w2_weight_scale_inv = torch.nn.Parameter(
+                    w2_weight_scale_inv, requires_grad=False)
+                if w2_input_scale is not None:
+                    layer.w2_input_scale = torch.nn.Parameter(
+                        w2_input_scale, requires_grad=False)
             return
         # If checkpoint is fp16, quantize in place.
         if not self.quant_config.is_checkpoint_fp8_serialized:
diff --git a/vllm/model_executor/layers/quantization/utils/fp8_utils.py b/vllm/model_executor/layers/quantization/utils/fp8_utils.py
@@ -5,6 +5,9 @@
 import triton
 import triton.language as tl
 
+from vllm.platforms import current_platform
+from vllm.utils import is_navi
+
 
 def apply_w8a8_block_fp8_linear(
     input: torch.Tensor,
@@ -34,10 +37,13 @@ def apply_w8a8_block_fp8_linear(
 
 def input_to_float8(
     x: torch.Tensor,
-    dtype: torch.dtype = torch.float8_e4m3fn
+    dtype: Optional[torch.dtype] = None,
 ) -> Tuple[torch.Tensor, torch.Tensor]:
     """This function quantizes input values to float8 values "
     "with tensor-wise quantization."""
+    if dtype is None:
+        dtype = (torch.float8_e4m3fnuz if current_platform.is_rocm()
+                 and not is_navi() else torch.float8_e4m3fn)
     finfo = torch.finfo(dtype)
     min_val, max_val = x.aminmax()
     amax = torch.maximum(min_val.abs(), max_val.abs()).clamp(min=1e-12)
@@ -125,7 +131,7 @@ def per_token_group_quant_fp8(
     x: torch.Tensor,
     group_size: int,
     eps: float = 1e-10,
-    dtype: torch.dtype = torch.float8_e4m3fn,
+    dtype: Optional[torch.dtype] = None,
 ) -> Tuple[torch.Tensor, torch.Tensor]:
     """Function to perform per-token-group quantization on an input tensor `x`.
     It converts the tensor values into signed float8 values and returns the
@@ -140,6 +146,9 @@ def per_token_group_quant_fp8(
         Tuple[torch.Tensor, torch.Tensor]: The quantized tensor and the
         scaling factor for quantization.
     """
+    if dtype is None:
+        dtype = (torch.float8_e4m3fnuz if current_platform.is_rocm()
+                 and not is_navi() else torch.float8_e4m3fn)
     assert (x.shape[-1] % group_size == 0), (
         f"the last dimension of `x` {x.shape[-1]} must be divisible "
         f"by `group_size` {group_size}")
