Stable Diffusion 3.x and Flux Optimization

onnxruntime/contrib_ops/cuda/bert/skip_layer_norm.cc

@@ -101,6 +101,7 @@ Status SkipLayerNorm<T, Simplified>::ComputeInternal(OpKernelContext* ctx) const
         (double)epsilon_,                                                               // epsilon
         reinterpret_cast<const CudaT*>(gamma->Data<T>()),                               // gamma
         (beta != nullptr) ? reinterpret_cast<const CudaT*>(beta->Data<T>()) : nullptr,  // beta
+        0,                                                                              // broadcast stride for gamma/beta
         reinterpret_cast<const CudaT*>(skip->Data<T>()),                                // skip or residual to add
         (bias != nullptr) ? reinterpret_cast<const CudaT*>(bias->Data<T>()) : nullptr,  // bias to add
         sum_output != nullptr ? reinterpret_cast<CudaT*>(sum_output->MutableData<T>()) : nullptr);

onnxruntime/core/providers/cuda/nn/layer_norm.cc

@@ -44,19 +44,36 @@ Status LayerNorm<T, U, V, simplified>::ComputeInternal(OpKernelContext* ctx) con
   auto bias_data = (simplified || (nullptr == bias)) ? nullptr : reinterpret_cast<const CudaV*>(bias->Data<V>());
 
   const TensorShape& x_shape = X->Shape();
-  const int64_t axis = HandleNegativeAxis(axis_, x_shape.NumDimensions());
+  auto x_num_dims = x_shape.NumDimensions();
+  const int64_t axis = HandleNegativeAxis(axis_, x_num_dims);
 
   int n1 = gsl::narrow<int>(x_shape.SizeToDimension(axis));
   int n2 = gsl::narrow<int>(x_shape.SizeFromDimension(axis));
 
   const auto scale_size = scale->Shape().Size();
   const auto bias_size = (bias_data) ? bias->Shape().Size() : 0;
+
+  int broadcast = 0;
   if (n2 == 1 || scale_size != n2 || (bias_data && bias_size != n2)) {
-    return ORT_MAKE_STATUS(ONNXRUNTIME, INVALID_ARGUMENT,
-                           "Size of X.shape()[axis:] == ", n2,
-                           ". Size of scale and bias (if provided) must match this "
-                           "and the size must not be 1. Got scale size of ",
-                           scale_size, " and bias size of ", bias_size);
+    // Handle a special case for MMDit where scale and bias need broadcast.
+    // X shape is (B, S, D), scale and bias shape is (B, 1, D), and we store S as broadcast stride.
+    if (x_num_dims == 3 && axis == 2 && n2 > 1 &&
+        scale->Shape().NumDimensions() == x_num_dims &&
+        scale->Shape().GetDims()[0] == x_shape.GetDims()[0] &&
+        scale->Shape().GetDims()[1] == 1 &&
+        scale->Shape().GetDims()[2] == x_shape.GetDims()[2] &&
+        bias->Shape().NumDimensions() == x_num_dims &&
+        bias->Shape().GetDims()[0] == x_shape.GetDims()[0] &&
+        bias->Shape().GetDims()[1] == 1 &&
+        bias->Shape().GetDims()[2] == x_shape.GetDims()[2]) {
+      broadcast = static_cast<int>(x_shape.GetDims()[1]);
+    } else {
+      return ORT_MAKE_STATUS(ONNXRUNTIME, INVALID_ARGUMENT,
+                             "Size of X.shape()[axis:] == ", n2,
+                             ". Size of scale and bias (if provided) must match this "
+                             "and the size must not be 1. Got scale size of ",
+                             scale_size, " and bias size of ", bias_size);
+    }
   }
 
   // Outputs
@@ -65,7 +82,7 @@ Status LayerNorm<T, U, V, simplified>::ComputeInternal(OpKernelContext* ctx) con
 
   // Mean and variance
   std::vector<int64_t> mean_inv_std_var_dim;
-  for (int i = 0; i < static_cast<int>(x_shape.NumDimensions()); ++i) {
+  for (int i = 0; i < static_cast<int>(x_num_dims); ++i) {
     if (i < axis) {
       mean_inv_std_var_dim.emplace_back(x_shape.GetDims()[i]);
     } else {
@@ -94,7 +111,7 @@ Status LayerNorm<T, U, V, simplified>::ComputeInternal(OpKernelContext* ctx) con
   }
 
   HostApplyLayerNorm<CudaT, CudaU, CudaV, simplified>(GetDeviceProp(), Stream(ctx), Y_data, mean_data, inv_var_data,
-                                                      X_data, n1, n2, epsilon_, scale_data, bias_data);
+                                                      X_data, n1, n2, epsilon_, scale_data, bias_data, broadcast);
   CUDA_RETURN_IF_ERROR(cudaGetLastError());
   return Status::OK();
 }

onnxruntime/core/providers/cuda/nn/layer_norm_impl.cu

@@ -334,6 +334,7 @@ __global__ void cuApplyLayerNorm(
     const U epsilon,
     const V* __restrict__ gamma,
     const V* __restrict__ beta,
+    int broadcast,
     const T* __restrict__ skip,
     const T* __restrict__ bias,
     T* __restrict__ skip_input_bias_add_output) {
@@ -366,8 +367,13 @@ __global__ void cuApplyLayerNorm(
         curr += static_cast<U>(skip_vals[i]);
       }
 
-      U gamma_i = (gamma != nullptr) ? (U)gamma[i] : (U)1;
-      U beta_i = (beta != nullptr) ? (U)beta[i] : (U)0;
+      // onnx operator LayerNormalization support broadcast.
+      // gamma and beta should be unidirectional broadcastable to tensor x.
+      // Here we support a special case for transformer models that x is (B, S, D) and gamma/beta is (B, 1, D)
+      int index = (broadcast > 0) ? ((i1 / broadcast) * n2 + i) : i;
+      U gamma_i = (gamma != nullptr) ? (U)gamma[index] : (U)1;
+      U beta_i = (beta != nullptr) ? (U)beta[index] : (U)0;
+
       if (simplified) {
         ovals[i] = static_cast<V>(gamma_i * c_inv_std_dev * curr);
       } else {
@@ -409,6 +415,7 @@ void HostApplyLayerNorm(
     double epsilon,
     const V* gamma,
     const V* beta,
+    int broadcast,
     const T* skip,
     const T* bias,
     T* skip_input_bias_add_output) {
@@ -442,15 +449,15 @@ void HostApplyLayerNorm(
       input,
       n1, n2,
       U(epsilon),
-      gamma, beta,
+      gamma, beta, broadcast,
       skip, bias, skip_input_bias_add_output);
 }
 
 #define LAYERNORM_LINEAR_IMPL(T, U, V, simplified)                                                                    \
   template void HostApplyLayerNorm<T, U, V, simplified>(const cudaDeviceProp& prop, cudaStream_t stream, V* output,   \
                                                         U* mean, U* inv_std_dev, const T* input, int n1, int n2,      \
-                                                        double epsilon, const V* gamma, const V* beta, const T* skip, \
-                                                        const T* bias, T* skip_input_bias_add_output);
+                                                        double epsilon, const V* gamma, const V* beta, int broadcast, \
+                                                        const T* skip, const T* bias, T* skip_input_bias_add_output);
 
 LAYERNORM_LINEAR_IMPL(float, float, float, true)
 LAYERNORM_LINEAR_IMPL(half, float, half, true)

onnxruntime/core/providers/cuda/nn/layer_norm_impl.h

@@ -41,6 +41,7 @@ void HostApplyLayerNorm(
     double epsilon,
     const V* gamma,
     const V* beta,
+    int broadcast = 0,  // broadcast stride for gamma/beta
     const T* skip = nullptr,
     const T* bias = nullptr,
     T* skip_input_bias_add_output = nullptr);

onnxruntime/python/tools/transformers/fusion_attention.py

@@ -399,45 +399,6 @@ def split_kv(self, present_k_name: str, present_v_name: str, kv_node: str):
         self.node_name_to_graph_name[gather_k_name] = self.this_graph_name
         self.node_name_to_graph_name[gather_v_name] = self.this_graph_name
 
-    def transpose_kv(self, past_k: str, past_v: str):
-        """Transpose past_k and past_v from (B,N,P,H) to (B,P,N,H)
-
-        Args:
-            past_k (str): name of past K value of shape (B,N,P,H)
-            past_v (str): name of past V value of shape (B,N,P,H)
-
-        Returns:
-            past_k_transpose (str): name of past K value of shape (B,P,N,H)
-            past_v_transpose (str): name of past V value of shape (B,P,N,H)
-        """
-        past_k_transpose = (past_k + "_transposed").replace(".", "_")
-        past_v_transpose = (past_v + "_transposed").replace(".", "_")
-        transpose_k_name = self.model.create_node_name("Transpose")
-        transpose_v_name = self.model.create_node_name("Transpose")
-
-        transpose_k = helper.make_node(
-            "Transpose",
-            inputs=[past_k],
-            outputs=[past_k_transpose],
-            name=transpose_k_name,
-            perm=[0, 2, 1, 3],
-        )
-        transpose_v = helper.make_node(
-            "Transpose",
-            inputs=[past_v],
-            outputs=[past_v_transpose],
-            name=transpose_v_name,
-            perm=[0, 2, 1, 3],
-        )
-
-        # Add reshape nodes to graph
-        self.nodes_to_add.append(transpose_k)
-        self.nodes_to_add.append(transpose_v)
-        self.node_name_to_graph_name[transpose_k_name] = self.this_graph_name
-        self.node_name_to_graph_name[transpose_v_name] = self.this_graph_name
-
-        return past_k_transpose, past_v_transpose
-
     def create_combined_qkv_bias(
         self,
         q_add: NodeProto,

onnxruntime/python/tools/transformers/fusion_fastgelu.py

@@ -26,6 +26,9 @@
         if self.fuse_3(tanh_node, input_name_to_nodes, output_name_to_node):
             return
 
+        if self.fuse_4(tanh_node, input_name_to_nodes, output_name_to_node):
+            return
+
     def fuse_1(self, tanh_node, input_name_to_nodes, output_name_to_node) -> Optional[bool]:
         """
         Fuse Gelu with tanh into one node:
@@ -358,3 +361,122 @@
         self.nodes_to_add.append(fused_node)
         self.node_name_to_graph_name[fused_node.name] = self.this_graph_name
         return True
+
+    def fuse_4(self, tanh_node, input_name_to_nodes: Dict, output_name_to_node: Dict) -> Optional[bool]:
+        """
+        This pattern is from stable diffusion 3.5 model.
+        Fuse Gelu with tanh into one node:
+              +-----------------+------------------+
+              |                 |                  |
+              |                 v                  v
+            [root] ==> Mul --> Mul --> Mul -----> Add  --> Mul --> Tanh --> Add -----> Mul --> Mul -->
+              |                       (A=0.0447)          (A=0.7978)        (A=1)       ^     (A=0.5)
+              |                                                                         |
+              +-------------------------------------------------------------------------+
+        Note that constant input for Add and Mul could be first or second input.
+        """
+        if tanh_node.output[0] not in input_name_to_nodes:
+            return
+
+        children = input_name_to_nodes[tanh_node.output[0]]
+        if len(children) != 1 or children[0].op_type != "Add":
+            return
+        add_after_tanh = children[0]
+
+        if not self.model.has_constant_input(add_after_tanh, 1.0):
+            return
+
+        if add_after_tanh.output[0] not in input_name_to_nodes:
+            return
+        children = input_name_to_nodes[add_after_tanh.output[0]]
+        if len(children) != 1 or children[0].op_type != "Mul":
+            return
+        mul_after_tanh = children[0]
+
+        if mul_after_tanh.output[0] not in input_name_to_nodes:
+            return
+        children = input_name_to_nodes[mul_after_tanh.output[0]]
+        if len(children) != 1 or children[0].op_type != "Mul":
+            return
+        mul_half = children[0]
+        if not self.model.has_constant_input(mul_half, 0.5):
+            return
+
+        root_input = mul_after_tanh.input[0 if mul_after_tanh.input[1] == add_after_tanh.output[0] else 1]
+
+        mul_before_tanh = self.model.match_parent(tanh_node, "Mul", 0, output_name_to_node)
+        if mul_before_tanh is None:
+            return
+
+        i = self.model.find_constant_input(mul_before_tanh, 0.7978, delta=0.0001)
+        if i < 0:
+            return
+
+        add_before_tanh = self.model.match_parent(mul_before_tanh, "Add", 0 if i == 1 else 1, output_name_to_node)
+        if add_before_tanh is None:
+            return
+
+        if add_before_tanh.input[0] == root_input:
+            another = 1
+        elif add_before_tanh.input[1] == root_input:
+            another = 0
+        else:
+            return
+
+        mul_after_pow = self.model.match_parent(add_before_tanh, "Mul", another, output_name_to_node)
+        if mul_after_pow is None:
+            return
+
+        i = self.model.find_constant_input(mul_after_pow, 0.0447, delta=0.0001)
+        if i < 0:
+            return
+
+        mul = self.model.match_parent(mul_after_pow, "Mul", 0 if i == 1 else 1, output_name_to_node)
+        if mul is None:
+            return
+
+        if mul.input[0] == root_input:
+            another = 1
+        elif mul.input[1] == root_input:
+            another = 0
+        else:
+            return
+
+        mul2 = self.model.match_parent(mul, "Mul", another, output_name_to_node)
+        if mul2 is None:
+            return
+
+        if mul2.input[0] != root_input or mul2.input[1] != root_input:
+            return
+
+        subgraph_nodes = [
+            mul2,
+            mul,
+            mul_after_pow,
+            add_before_tanh,
+            mul_before_tanh,
+            tanh_node,
+            add_after_tanh,
+            mul_after_tanh,
+            mul_half,
+        ]
+
+        if not self.model.is_safe_to_fuse_nodes(
+            subgraph_nodes,
+            [mul_half.output[0]],
+            input_name_to_nodes,
+            output_name_to_node,
+        ):
+            return
+
+        self.nodes_to_remove.extend(subgraph_nodes)
+        fused_node = helper.make_node(
+            "FastGelu",
+            inputs=[root_input],
+            outputs=mul_half.output,
+            name=self.model.create_node_name("FastGelu"),
+        )
+        fused_node.domain = "com.microsoft"
+        self.nodes_to_add.append(fused_node)
+        self.node_name_to_graph_name[fused_node.name] = self.this_graph_name
+        return True