add GatherSliceToSplitFusion and Unittest (#19218)

### Multi Query Attention Optimization

in multi-query attention
```
batch_size, seq_length, three_times_hidden_size = fused_qkv.shape
fused_qkv = fused_qkv.view(batch_size, seq_length, self.num_heads + 2, self.head_dim)
return fused_qkv[..., :-2, :], fused_qkv[..., [-2], :], fused_qkv[..., [-1], :]
```
which can be optimized to 
```
batch_size, seq_length, three_times_hidden_size = fused_qkv.shape
fused_qkv = fused_qkv.view(batch_size, seq_length, self.num_heads + 2, self.head_dim)
(query, key, value) = fused_qkv.split([self.num_heads, 1, 1], dim=2)
return query, key, value
```

this optimization can be validated from nsight profiling and perf
benchmarking.
   
<img width="545" alt="image"
src="https://github.com/microsoft/onnxruntime/assets/15321482/cefcd061-4a01-4aaf-a008-8e265f7f63e9">

As such, This PR is to Optimize the `Gather/Gather/Slice` Ops to `Split`
Kernel.

### Optimization Target
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->

As 2 `Gather` and 1 `Slice` Kernels are time consuming for backward
prop, it would be efficient to use 1 `Split` Kernel


###  Example

- Before Fusion
<img width="419" alt="image"
src="https://github.com/microsoft/onnxruntime/assets/15321482/17410319-57ea-4176-afd4-1efdcd3fdbae">
 
- After Fusion
<img width="424" alt="image"
src="https://github.com/microsoft/onnxruntime/assets/15321482/f1ee1582-96d4-45f4-8778-49d1f3fd370a">

### Perf Gain
After the optimization, there will have **~7%** perf gain. 

> The `Transpose` Kernel can be fused too, will update it in next PR.
However, after testing Transponse Ops fusion on Falcon model, there is
no perf gain. Will not create a new PR.

---------

Co-authored-by: ruiren <ruiren@microsoft.com>
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@ -0,0 +1,344 @@
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
#include "core/optimizer/gather_slice_fusion.h"
#include "core/graph/graph_utils.h"
#include "core/optimizer/initializer.h"
#include "core/optimizer/utils.h"
namespace onnxruntime {
bool GatherSliceToSplitFusion::IsSupportedGather(const Graph& graph, const Node& node, int64_t& index,
int64_t& axis, int64_t& indices_n_dims) const {
if (!graph_utils::IsSupportedOptypeVersionAndDomain(node, "Gather", {1, 11, 13}) ||
!graph_utils::IsSupportedProvider(node, GetCompatibleExecutionProviders())) {
return false;
}
const NodeArg& input_arg = *(node.InputDefs()[1]);
if (!optimizer_utils::IsScalar(input_arg)) return false;
const ONNX_NAMESPACE::TensorProto* indices_init = graph_utils::GetConstantInitializer(graph, input_arg.Name());
if (!indices_init) return false;
if (indices_init->data_type() != ONNX_NAMESPACE::TensorProto::INT64) return false;
// get the index value
Initializer init_const(*indices_init, graph.ModelPath());
index = *(init_const.data<int64_t>());
// get attributes value
axis = 0;
auto& attrs = node.GetAttributes();
if (attrs.find("axis") != attrs.end()) {
auto& axis_attr = attrs.at("axis");
if (utils::HasInt(axis_attr)) axis = axis_attr.i();
}
indices_n_dims = indices_init->dims_size();
return true;
}
bool GatherSliceToSplitFusion::IsSupportedSlice(const Graph& graph, const Node& node,
InlinedVector<int64_t>& starts,
InlinedVector<int64_t>& ends,
InlinedVector<int64_t>& axes,
InlinedVector<int64_t>& steps) const {
// check the version of Slice ops
if (!graph_utils::IsSupportedOptypeVersionAndDomain(node, "Slice", {1, 10, 11, 13}) ||
!graph_utils::IsSupportedProvider(node, GetCompatibleExecutionProviders())) {
return false;
}
// get the opset version
int onnx_opset_version = -1;
if (graph.DomainToVersionMap().find(kOnnxDomain) != graph.DomainToVersionMap().end()) {
onnx_opset_version = graph.DomainToVersionMap().at(kOnnxDomain);
}
// If Slice op of opset version 1
if (onnx_opset_version == 1) {
if (!graph_utils::GetRepeatedNodeAttributeValues(node, "starts", starts) ||
!graph_utils::GetRepeatedNodeAttributeValues(node, "ends", ends) ||
starts.size() != ends.size()) {
return false;
}
if (graph_utils::GetRepeatedNodeAttributeValues(node, "axes", axes) && (axes.size() != starts.size())) {
return false;
}
}
// If Slice op of opset version >= 10
if (onnx_opset_version >= 10) {
// node inputs include: starts - ends - axes - steps
// return a pointer to the corresponding NodeArg if input of the node at the index exists
auto get_input_if_exists = [&node](size_t input_index) -> const NodeArg* {
const auto& input_defs = node.InputDefs();
const NodeArg* input = (input_defs.size() > input_index) ? input_defs[input_index] : nullptr;
return (input == nullptr || !input->Exists()) ? nullptr : input;
};
// return a pointer to the initializer if it is constant; otherwise, a nullptr
auto get_initializer_if_constant =
[&graph, get_input_if_exists](size_t input_index) -> const ONNX_NAMESPACE::TensorProto* {
const NodeArg* input = get_input_if_exists(input_index);
return input ? graph_utils::GetConstantInitializer(graph, input->Name()) : nullptr;
};
// return the initialization data if it is constant
auto get_initializer_data =
[&graph](const ONNX_NAMESPACE::TensorProto* slice_initializer) -> InlinedVector<int64_t> {
Initializer init(*slice_initializer, graph.ModelPath());
if (slice_initializer->data_type() == ONNX_NAMESPACE::TensorProto::INT32) {
int32_t* init_data = init.data<int32_t>();
return InlinedVector<int64_t>(init_data, init_data + init.size());
}
if (slice_initializer->data_type() == ONNX_NAMESPACE::TensorProto::INT64) {
int64_t* init_data = init.data<int64_t>();
return InlinedVector<int64_t>(init_data, init_data + init.size());
}
return {};
};
// starts and ends inputs have to exist, be constants and be of the same size.
const ONNX_NAMESPACE::TensorProto* starts_init = get_initializer_if_constant(1);
const ONNX_NAMESPACE::TensorProto* ends_init = get_initializer_if_constant(2);
const ONNX_NAMESPACE::TensorProto* axes_init = get_initializer_if_constant(3);
const ONNX_NAMESPACE::TensorProto* steps_init = get_initializer_if_constant(4);
if (!starts_init || !ends_init || !axes_init || !steps_init) {
return false;
}
starts = get_initializer_data(starts_init);
ends = get_initializer_data(ends_init);
axes = get_initializer_data(axes_init);
steps = get_initializer_data(steps_init);
if (starts.size() == 0 || ends.size() == 0 || starts.size() != ends.size()) {
return false;
}
if (axes_init->dims_size() != 1 || static_cast<size_t>(axes_init->dims().Get(0)) != starts.size()) {
return false;
}
// if steps exists, it should be constant and all value should be 1
if (steps.size() != starts.size()) {
return false;
}
for (int64_t step : steps) {
if (step != 1) {
return false;
}
}
}
return true;
}
/*
GatherToSplitFusion is to fuse:
Node
|-> Gather(index=0, axis=axis)
|-> Gather(index=1, axis=axis)
|-> Slice(index=2, axis=axis)
To
Node
|-> Split(index=0)
So that we can use one kernel to finish the job.
*/
Status GatherSliceToSplitFusion::ApplyImpl(Graph& graph, bool& modified, int graph_level,
const logging::Logger& logger) const {
GraphViewer graph_viewer(graph);
const auto& node_topology_list = graph_viewer.GetNodesInTopologicalOrder();
InlinedVector<const NodeArg*> output_args;
// Iterate the topological order and get Reshape ops
for (auto node_index : node_topology_list) {
auto* p_node = graph.GetNode(node_index);
if (p_node == nullptr) continue;
Node& node = *p_node;
ORT_RETURN_IF_ERROR(Recurse(node, modified, graph_level, logger));
// Currently only catch after Reshape ops, optimize in the future
if (node.OpType() != "Reshape") continue;
size_t output_count = node.GetOutputEdgesCount();
// We only catch 1 scenario for Multi Query Attention for now.
// |---> Gather
// Reshape |---> Gather
// |---> Slice
// |... or (other ops)
// Get the output into node args
if (output_count < 3) continue;
output_args.push_back(node.OutputDefs()[0]);
}
// iterate the children of Reshape node
for (const NodeArg* node_arg : output_args) {
auto shape = node_arg->Shape();
if (!shape) continue;
auto consumers = graph.GetConsumerNodes(node_arg->Name());
size_t consumer_count = consumers.size();
// get the tensor rank
int64_t rank = static_cast<int64_t>(shape->dim_size());
bool can_fuse = true;
bool first_edge = true;
int64_t split_axis = 0;
int64_t indices_n_dims = -1;
// Fuse 2 Gathers and 1 slice to Split
// Get those outputs as Split outputs
InlinedVector<NodeArg*> split_outputs(3);
InlinedVector<std::reference_wrapper<Node>> nodes_to_fuse;
size_t gather_node_count = 2, slice_node_count = 0;
// find the nodes to be merged
for (auto consumer : consumers) {
int64_t index, axis, dims;
InlinedVector<int64_t> starts, ends, axes, steps;
bool IsSupportedGatherOps = IsSupportedGather(graph, *consumer, index, axis, dims);
bool IsSupportedSliceOps = IsSupportedSlice(graph, *consumer, starts, ends, axes, steps);
if ((!consumer || consumer->InputDefs()[0] != node_arg) ||
(!IsSupportedGatherOps && !IsSupportedSliceOps)) {
break;
}
if (IsSupportedGatherOps) {
if (indices_n_dims == -1) {
indices_n_dims = dims;
} else if (indices_n_dims != dims) {
// Not the same number of dimensions (0 or 1) for all scalar indices.
can_fuse = false;
break;
}
if (axis < 0) axis += rank;
if (first_edge) {
auto dim = shape->dim(static_cast<int>(axis));
// dim.dim_value() = 73
if (!utils::HasDimValue(dim)) {
can_fuse = false;
break;
}
split_axis = axis;
first_edge = false;
} else if (axis != split_axis) {
can_fuse = false;
break;
}
if (index < 0) index += static_cast<int64_t>(consumer_count);
if (index < 0 || index >= static_cast<int64_t>(consumer_count)) {
can_fuse = false;
break;
}
Node& gather_node = *graph.GetNode(consumer->Index());
nodes_to_fuse.push_back(gather_node);
NodeArg* gather_output_args = gather_node.MutableOutputDefs()[0];
split_outputs[gather_node_count--] = gather_output_args;
}
// check the Slice Ops
if (IsSupportedSliceOps) {
if (axes[0] != axis && !first_edge) {
can_fuse = false;
break;
}
Node& slice_node = *graph.GetNode(consumer->Index());
NodeArg* slice_output_args = slice_node.MutableOutputDefs()[0];
nodes_to_fuse.push_back(slice_node);
split_outputs[slice_node_count++] = slice_output_args;
}
}
// condition check
if (!can_fuse || gather_node_count != 0 || slice_node_count != 1) continue;
// generate the split node and merge the kernel
ONNX_NAMESPACE::TypeProto split_output_type;
const ONNX_NAMESPACE::TensorProto_DataType element_type = static_cast<ONNX_NAMESPACE::TensorProto_DataType>(
node_arg->TypeAsProto()->tensor_type().elem_type());
split_output_type.mutable_tensor_type()->set_elem_type(element_type);
for (int64_t i = 0; i < rank; i++) {
if (i == split_axis)
split_output_type.mutable_tensor_type()->mutable_shape()->add_dim()->set_dim_value(1LL);
else
*(split_output_type.mutable_tensor_type()->mutable_shape()->add_dim()) = shape->dim(static_cast<int>(i));
}
InlinedVector<NodeArg*> split_output_types;
for (size_t i = 0; i < consumer_count; ++i) {
split_output_types.push_back(
&graph.GetOrCreateNodeArg(
graph.GenerateNodeArgName("fused_split_" + std::to_string(i)), &split_output_type));
}
// Generate the Split Node
ONNX_NAMESPACE::TensorProto split_initializer_proto;
split_initializer_proto.set_name(graph.GenerateNodeName("fused_Split"));
split_initializer_proto.add_dims(static_cast<int64_t>(3));
split_initializer_proto.set_data_type(ONNX_NAMESPACE::TensorProto_DataType_INT64);
auto dim_value = shape->dim(static_cast<int>(split_axis)).dim_value();
// Optimize 2 Gather Nodes, so Slice_dim = dim_value - 2
int64_t slice_dim = static_cast<int64_t>(dim_value - 2);
InlinedVector<int64_t> split_value{{slice_dim, 1, 1}};
split_initializer_proto.set_raw_data(split_value.data(), split_value.size() * sizeof(int64_t));
NodeArg* split_arg = &graph_utils::AddInitializer(graph, split_initializer_proto);
Node& split_node =
graph.AddNode(graph.GenerateNodeName("Split"), "Split", "Split for fused Gather-Slice fusion",
{graph.GetNodeArg(node_arg->Name()), split_arg}, split_outputs);
split_node.AddAttribute("axis", split_axis);
split_node.SetExecutionProviderType(nodes_to_fuse[0].get().GetExecutionProviderType());
int onnx_opset_version = -1;
if (graph.DomainToVersionMap().find(kOnnxDomain) != graph.DomainToVersionMap().end()) {
onnx_opset_version = graph.DomainToVersionMap().at(kOnnxDomain);
}
if (onnx_opset_version >= 18) {
split_node.AddAttribute("num_outputs", static_cast<int64_t>(consumer_count));
}
for (Node& node_to_fuse : nodes_to_fuse) {
graph_utils::RemoveNodeOutputEdges(graph, node_to_fuse);
graph.RemoveNode(node_to_fuse.Index());
}
modified = true;
}
return Status::OK();
}
} // namespace onnxruntime

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@ -0,0 +1,32 @@
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
#pragma once
#include "core/optimizer/graph_transformer.h"
namespace onnxruntime {
/**
@class GatherSliceToSplitFusion
Fuse (2 Gather nodes + 1 Slice) to 1 split node.
*/
class GatherSliceToSplitFusion : public GraphTransformer {
private:
bool IsSupportedGather(const Graph& graph, const Node& node, int64_t& index, int64_t& axis,
int64_t& indices_n_dims) const;
bool IsSupportedSlice(const Graph& graph, const Node& node,
InlinedVector<int64_t>& starts,
InlinedVector<int64_t>& ends,
InlinedVector<int64_t>& axes,
InlinedVector<int64_t>& steps) const;
public:
GatherSliceToSplitFusion(const InlinedHashSet<std::string_view>& compatible_execution_providers = {}) noexcept
: GraphTransformer("GatherSliceToSplitFusion", compatible_execution_providers) {}
Status ApplyImpl(Graph& graph, bool& modified, int graph_level, const logging::Logger& logger) const override;
};
} // namespace onnxruntime

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@ -37,6 +37,7 @@
#include "core/optimizer/fast_gelu_fusion.h"
#include "core/optimizer/free_dim_override_transformer.h"
#include "core/optimizer/gather_fusion.h"
#include "core/optimizer/gather_slice_fusion.h"
#include "core/optimizer/gelu_approximation.h"
#include "core/optimizer/gelu_fusion.h"
#include "core/optimizer/gemm_activation_fusion.h"
@ -308,6 +309,7 @@ InlinedVector<std::unique_ptr<GraphTransformer>> GenerateTransformers(
transformers.emplace_back(std::make_unique<EmbedLayerNormFusion>(cpu_cuda_dml_rocm_eps));
transformers.emplace_back(std::make_unique<GatherToSplitFusion>(cpu_cuda_rocm_eps));
transformers.emplace_back(std::make_unique<GatherToSliceFusion>(cpu_cuda_rocm_eps));
transformers.emplace_back(std::make_unique<GatherSliceToSplitFusion>(cpu_cuda_rocm_eps));
transformers.emplace_back(std::make_unique<MatmulTransposeFusion>(cpu_cuda_dml_rocm_eps));
transformers.emplace_back(std::make_unique<BiasGeluFusion>(cpu_cuda_dml_rocm_eps));

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@ -42,6 +42,7 @@
#include "core/optimizer/expand_elimination.h"
#include "core/optimizer/fast_gelu_fusion.h"
#include "core/optimizer/gather_fusion.h"
#include "core/optimizer/gather_slice_fusion.h"
#include "core/optimizer/gelu_approximation.h"
#include "core/optimizer/gelu_fusion.h"
#include "core/optimizer/gemm_activation_fusion.h"
@ -7642,5 +7643,143 @@ TEST_F(GraphTransformationTests, GatherToSliceFusion) {
}
}
TEST_F(GraphTransformationTests, GatherSliceToSplitFusion) {
{
auto build_test_case = [&](ModelTestBuilder& builder) {
auto* data_arg = builder.MakeInput<float>({{54}});
auto* reshape_arg = builder.MakeInput<int64_t>({{4}});
auto* reshape_out = builder.MakeIntermediate<float>({{2, 512, 73, 64}});
builder.AddNode("Reshape", {data_arg, reshape_arg}, {reshape_out});
// Create Gather-1 Ops
auto* gather_index_1 = builder.MakeInitializer<int64_t>({}, {static_cast<int64_t>(-2)});
auto* gather_out_1 = builder.MakeIntermediate<float>({{2, 512, 1, 64}});
builder.AddNode("Gather", {reshape_out, gather_index_1}, {gather_out_1})
.AddAttribute("axis", static_cast<int64_t>(2));
// Create Transpose 1-Ops
auto* transpose_out_1 = builder.MakeOutput();
builder.AddNode("Transpose", {gather_out_1}, {transpose_out_1})
.AddAttribute("perm", std::vector<int64_t>{0, 2, 1, 3});
// Create Gather-2 Ops
auto* gather_index_2 = builder.MakeInitializer<int64_t>({}, {static_cast<int64_t>(-1)});
auto* gather_out_2 = builder.MakeIntermediate<float>({{2, 512, 1, 64}});
builder.AddNode("Gather", {reshape_out, gather_index_2}, {gather_out_2})
.AddAttribute("axis", static_cast<int64_t>(2));
// Create Transpose-2 Ops
auto* transpose_out_2 = builder.MakeOutput();
builder.AddNode("Transpose", {gather_out_2}, {transpose_out_2})
.AddAttribute("perm", std::vector<int64_t>{0, 2, 1, 3});
// Create Slice Ops
auto* slice_output = builder.MakeIntermediate();
auto* starts = builder.MakeInitializer<int64_t>({1}, {0});
auto* ends = builder.MakeInitializer<int64_t>({1}, {-2});
auto* axes = builder.MakeInitializer<int64_t>({1}, {2});
auto* steps = builder.MakeInitializer<int64_t>({1}, {1});
builder.AddNode("Slice", {reshape_out, starts, ends, axes, steps}, {slice_output});
// Create Shape-1 Ops
auto* shape_output_1 = builder.MakeOutput();
builder.AddNode("Shape", {slice_output}, {shape_output_1});
// Create Shape-2 Ops
auto* shape_output_2 = builder.MakeOutput();
builder.AddNode("Shape", {slice_output}, {shape_output_2});
// Create Transpose-3 Ops
auto* transpose_out_3 = builder.MakeOutput();
builder.AddNode("Transpose", {slice_output}, {transpose_out_3})
.AddAttribute("perm", std::vector<int64_t>{0, 2, 1, 3});
};
auto pre_graph_checker = [&](Graph& graph) {
TEST_RETURN_IF_NOT(CountOpsInGraph(graph)["Gather"] == 2);
TEST_RETURN_IF_NOT(CountOpsInGraph(graph)["Slice"] == 1);
return Status::OK();
};
auto post_graph_checker = [&](Graph& graph) {
TEST_RETURN_IF_NOT(CountOpsInGraph(graph)["Gather"] == 0);
TEST_RETURN_IF_NOT(CountOpsInGraph(graph)["Slice"] == 0);
TEST_RETURN_IF_NOT(CountOpsInGraph(graph)["Split"] == 1);
for (auto& node : graph.Nodes()) {
if (node.OpType() == "Split") {
auto& attrs = node.GetAttributes();
TEST_RETURN_IF_NOT(static_cast<int>(attrs.at("axis").i()) == 2);
}
}
return Status::OK();
};
std::unique_ptr<GraphTransformer> transformer = std::make_unique<GatherSliceToSplitFusion>();
ASSERT_STATUS_OK(TestGraphTransformer(build_test_case, 14, *logger_, std::move(transformer),
TransformerLevel::Level1, 1, pre_graph_checker, post_graph_checker));
}
}
TEST_F(GraphTransformationTests, GatherSliceToSplitFusion_Invalid) {
{
auto build_test_case = [&](ModelTestBuilder& builder) {
auto* data_arg = builder.MakeInput<float>({{54}});
auto* reshape_arg = builder.MakeInput<int64_t>({{4}});
auto* reshape_out = builder.MakeIntermediate<float>({{2, 512, 73, 64}});
builder.AddNode("Reshape", {data_arg, reshape_arg}, {reshape_out});
// Create Gather-1 Ops
auto* gather_index_1 = builder.MakeInitializer<int64_t>({}, {static_cast<int64_t>(-2)});
auto* gather_out_1 = builder.MakeIntermediate<float>({{2, 512, 1, 64}});
builder.AddNode("Gather", {reshape_out, gather_index_1}, {gather_out_1})
.AddAttribute("axis", static_cast<int64_t>(2));
// Create Transpose 1-Ops
auto* transpose_out_1 = builder.MakeOutput();
builder.AddNode("Transpose", {gather_out_1}, {transpose_out_1})
.AddAttribute("perm", std::vector<int64_t>{0, 2, 1, 3});
// Create Slice Ops
auto* slice_output = builder.MakeIntermediate();
auto* starts = builder.MakeInitializer<int64_t>({1}, {0});
auto* ends = builder.MakeInitializer<int64_t>({1}, {-2});
auto* axes = builder.MakeInitializer<int64_t>({1}, {2});
auto* steps = builder.MakeInitializer<int64_t>({1}, {1});
builder.AddNode("Slice", {reshape_out, starts, ends, axes, steps}, {slice_output});
// Create Shape-1 Ops
auto* shape_output_1 = builder.MakeOutput();
builder.AddNode("Shape", {slice_output}, {shape_output_1});
// Create Shape-2 Ops
auto* shape_output_2 = builder.MakeOutput();
builder.AddNode("Shape", {slice_output}, {shape_output_2});
// Create Transpose-3 Ops
auto* transpose_out_3 = builder.MakeOutput();
builder.AddNode("Transpose", {slice_output}, {transpose_out_3})
.AddAttribute("perm", std::vector<int64_t>{0, 2, 1, 3});
};
auto pre_graph_checker = [&](Graph& graph) {
TEST_RETURN_IF_NOT(CountOpsInGraph(graph)["Gather"] == 1);
TEST_RETURN_IF_NOT(CountOpsInGraph(graph)["Slice"] == 1);
return Status::OK();
};
auto post_graph_checker = [&](Graph& graph) {
TEST_RETURN_IF_NOT(CountOpsInGraph(graph)["Gather"] == 1);
TEST_RETURN_IF_NOT(CountOpsInGraph(graph)["Slice"] == 1);
TEST_RETURN_IF_NOT(CountOpsInGraph(graph)["Split"] == 0);
return Status::OK();
};
std::unique_ptr<GraphTransformer> transformer = std::make_unique<GatherSliceToSplitFusion>();
ASSERT_STATUS_OK(TestGraphTransformer(build_test_case, 14, *logger_, std::move(transformer),
TransformerLevel::Level1, 1, pre_graph_checker, post_graph_checker));
}
}
} // namespace test
} // namespace onnxruntime

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@ -24,6 +24,7 @@
#include "core/optimizer/fast_gelu_fusion.h"
#include "core/optimizer/free_dim_override_transformer.h"
#include "core/optimizer/gather_fusion.h"
#include "core/optimizer/gather_slice_fusion.h"
#include "core/optimizer/gelu_approximation.h"
#include "core/optimizer/gelu_fusion.h"
#include "core/optimizer/gemm_activation_fusion.h"
@ -140,6 +141,7 @@ std::vector<std::unique_ptr<GraphTransformer>> GeneratePreTrainingTransformers(
transformers.emplace_back(std::make_unique<SoftmaxCrossEntropyLossInternalFusion>(compatible_eps));
transformers.emplace_back(std::make_unique<GatherToSplitFusion>(compatible_eps));
transformers.emplace_back(std::make_unique<GatherToSliceFusion>(compatible_eps));
transformers.emplace_back(std::make_unique<GatherSliceToSplitFusion>(compatible_eps));
// If a model with Q, DQ nodes is being used for the purpose of training, it must be for
// Quantization Aware Training. So, replace QDQ nodes with FakeQuant.
transformers.emplace_back(std::make_unique<QDQFusion>(compatible_eps));