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[Native WebGPU] Fix the error when past and present key/value share buffer #23315

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[Native WebGPU] Fix the error when past and present key/value share buffer #23315

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b0e05b6
Fix the "typo" error when past and present key/value share buffer
satyajandhyala Jan 10, 2025
7d4e2c5
Added is_first_prompt to uniforms to reduce shader code duplication.
satyajandhyala Jan 10, 2025
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27 changes: 15 additions & 12 deletions onnxruntime/contrib_ops/webgpu/bert/attention.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -69,10 +69,10 @@ Status TransferBSDToBNSH(onnxruntime::webgpu::ComputeContext& context, int num_h
return context.RunProgram(program);
};

void InitVarStub(std::ostringstream& ss, const Tensor* seqlen_k, bool is_first_prompt) {
void InitVarStub(std::ostringstream& ss, const Tensor* seqlen_k) {
if (seqlen_k != nullptr) {
ss << "total_sequence_length = u32(seqlen_k[batch_idx]) + 1;\n";
ss << "var past_sequence_length: u32 = " << (is_first_prompt ? "0" : "total_sequence_length - sequence_length") << ";\n";
ss << "var past_sequence_length: u32 = select(total_sequence_length - sequence_length, 0u, uniforms.is_first_prompt > 0);\n";
} else {
ss << "let past_sequence_length = uniforms.past_sequence_length;\n";
}
Expand Down Expand Up @@ -106,7 +106,7 @@ Status AttentionProbsProgram::GenerateShaderCode(ShaderHelper& shader) const {
<< "let sequence_length = uniforms.M;\n"
<< "var total_sequence_length = uniforms.N;\n";
std::ostringstream oss;
InitVarStub(oss, seqlen_k_, is_first_prompt_);
InitVarStub(oss, seqlen_k_);
shader.MainFunctionBody() << oss.str();
shader.MainFunctionBody() << "let kOffset = (workgroup_id.z / " << n_reps_ << ") * uniforms.kv_sequence_length * uniforms.K;\n";
if (has_present_key_) {
Expand All @@ -121,7 +121,7 @@ Status AttentionProbsProgram::GenerateShaderCode(ShaderHelper& shader) const {
" if (n + local_id.y < uniforms.N && w + local_id.x < uniforms.K) {\n"
" var idx = TILE_SIZE * local_id.y + local_id.x;\n";

if ((feed_past_key_ && has_present_key_) || past_present_share_buffer_) {
if ((feed_past_key_ && has_present_key_) || (past_present_share_buffer_ && !is_first_prompt_)) {
shader.MainFunctionBody() << " if (n + local_id.y < past_sequence_length) {\n"
<< " let pastKeyOffset = (workgroup_id.z / " << n_reps_ << ") * uniforms.past_sequence_length * uniforms.K;\n"
<< " tileK[idx] = " << (past_present_share_buffer_ ? "present_key" : "past_key") << "[pastKeyOffset + (n + local_id.y) * uniforms.K + w + local_id.x];\n"
Expand Down Expand Up @@ -213,7 +213,8 @@ Status ComputeAttentionProbs(onnxruntime::webgpu::ComputeContext& context, int o
{static_cast<uint32_t>(past_sequence_length)},
{static_cast<uint32_t>(parameters.kv_sequence_length_)},
{static_cast<uint32_t>(seqlen_k == nullptr ? total_sequence_length : parameters.seqlen_present_kv_cache_)},
{static_cast<uint32_t>(parameters.n_reps)}})
{static_cast<uint32_t>(parameters.n_reps)},
{static_cast<uint32_t>(parameters.is_first_prompt_ ? 1 : 0)}})
.SetOverridableConstants({{static_cast<uint32_t>(tile_size)}});

return context.RunProgram(program);
Expand All @@ -231,7 +232,7 @@ Status InPlaceSoftmaxProgram::GenerateShaderCode(ShaderHelper& shader) const {
<< "let sequence_length = uniforms.sequence_length;\n"
<< "var total_sequence_length = uniforms.total_sequence_length_comp * " << components_ << ";\n";
std::ostringstream oss;
InitVarStub(oss, seqlen_k_, is_first_prompt_);
InitVarStub(oss, seqlen_k_);
shader.MainFunctionBody() << oss.str()
<< "let local_offset = local_idx * uniforms.elements_per_thread;\n"
<< "let offset = (global_idx / " << work_group_size_ << ") * uniforms.total_sequence_length_comp + local_offset;\n"
Expand Down Expand Up @@ -290,15 +291,16 @@ Status ComputeInPlaceSoftmax(onnxruntime::webgpu::ComputeContext& context, Tenso
program.AddInput({seqlen_k, ProgramTensorMetadataDependency::TypeAndRank});
}
program.AddOutputs({{probs, ProgramTensorMetadataDependency::TypeAndRank, components}})
.CacheHint(work_group_size, is_first_prompt)
.CacheHint(work_group_size)
.SetDispatchGroupSize(1, sequence_length, batch_size * num_heads)
.SetWorkgroupSize(work_group_size)
.AddUniformVariables({{static_cast<uint32_t>(batch_size)},
{static_cast<uint32_t>(num_heads)},
{static_cast<uint32_t>(past_sequence_length)},
{static_cast<uint32_t>(sequence_length)},
{static_cast<uint32_t>(total_sequence_length_comp)},
{static_cast<uint32_t>(elementsPerThread)}});
{static_cast<uint32_t>(elementsPerThread)},
{static_cast<uint32_t>(is_first_prompt ? 1 : 0)}});

return context.RunProgram(program);
}
Expand Down Expand Up @@ -327,7 +329,7 @@ Status VxAttentionScoreProgram::GenerateShaderCode(ShaderHelper& shader) const {
<< "let sequence_length = uniforms.M;\n"
<< "var total_sequence_length = uniforms.K;\n";
std::ostringstream oss;
InitVarStub(oss, seqlen_k_, is_first_prompt_);
InitVarStub(oss, seqlen_k_);
shader.MainFunctionBody() << oss.str();
shader.MainFunctionBody() << "let vOffset = (workgroup_id.z / " << n_reps_ << ") * uniforms.N * uniforms.kv_sequence_length + n;\n";
if (has_present_value_) {
Expand All @@ -342,12 +344,12 @@ Status VxAttentionScoreProgram::GenerateShaderCode(ShaderHelper& shader) const {
<< " if (n < uniforms.N && w + local_id.y < uniforms.K) {\n"
<< " var idx = TILE_SIZE * local_id.y + local_id.x;\n";

if ((feed_past_value_ && has_present_value_) || past_present_share_buffer_) {
if ((feed_past_value_ && has_present_value_) || (past_present_share_buffer_ && !is_first_prompt_)) {
shader.MainFunctionBody() << " if (w + local_id.y < past_sequence_length) {\n"
<< " let pastValueOffset = (workgroup_id.z / " << n_reps_ << ") * uniforms.N * uniforms.past_sequence_length + n;\n"
<< " tileK[idx] = " << (past_present_share_buffer_ ? "present_value" : "past_value") << "[pastValueOffset + (w + local_id.y) * uniforms.N];\n"
<< " } else if (w + local_id.y - past_sequence_length < uniforms.kv_sequence_length) {\n"
<< " tileK[idx] = v[vOffset + (w + local_id.y - uniforms.past_sequence_length) * uniforms.N];\n"
<< " tileK[idx] = v[vOffset + (w + local_id.y - past_sequence_length) * uniforms.N];\n"
<< " }\n";
} else {
shader.MainFunctionBody() << " if (w + local_id.y < uniforms.kv_sequence_length) {\n"
Expand Down Expand Up @@ -425,7 +427,8 @@ Status ComputeVxAttentionScore(onnxruntime::webgpu::ComputeContext& context, int
{static_cast<uint32_t>(past_sequence_length)},
{static_cast<uint32_t>(parameters.kv_sequence_length_)},
{static_cast<uint32_t>(seqlen_k == nullptr ? total_sequence_length : parameters.seqlen_present_kv_cache_)},
{static_cast<uint32_t>(parameters.n_reps)}})
{static_cast<uint32_t>(parameters.n_reps)},
{static_cast<uint32_t>(parameters.is_first_prompt_)}})
.SetOverridableConstants({{static_cast<uint32_t>(tile_size)}});

return context.RunProgram(program);
Expand Down
9 changes: 6 additions & 3 deletions onnxruntime/contrib_ops/webgpu/bert/attention.h
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,8 @@ class AttentionProbsProgram final : public Program<AttentionProbsProgram> {
{"past_sequence_length", ProgramUniformVariableDataType::Uint32},
{"kv_sequence_length", ProgramUniformVariableDataType::Uint32},
{"present_sequence_length", ProgramUniformVariableDataType::Uint32},
{"n_reps", ProgramUniformVariableDataType::Uint32});
{"n_reps", ProgramUniformVariableDataType::Uint32},
{"is_first_prompt", ProgramUniformVariableDataType::Uint32});

WEBGPU_PROGRAM_DEFINE_OVERRIDABLE_CONSTANTS({"TILE_SIZE", ProgramConstantDataType::Uint32});

Expand Down Expand Up @@ -78,7 +79,8 @@ class InPlaceSoftmaxProgram final : public Program<InPlaceSoftmaxProgram> {
{"past_sequence_length", ProgramUniformVariableDataType::Uint32},
{"sequence_length", ProgramUniformVariableDataType::Uint32},
{"total_sequence_length_comp", ProgramUniformVariableDataType::Uint32},
{"elements_per_thread", ProgramUniformVariableDataType::Uint32});
{"elements_per_thread", ProgramUniformVariableDataType::Uint32},
{"is_first_prompt", ProgramUniformVariableDataType::Uint32});

private:
int work_group_size_;
Expand All @@ -104,7 +106,8 @@ class VxAttentionScoreProgram final : public Program<VxAttentionScoreProgram> {
{"past_sequence_length", ProgramUniformVariableDataType::Uint32},
{"kv_sequence_length", ProgramUniformVariableDataType::Uint32},
{"present_sequence_length", ProgramUniformVariableDataType::Uint32},
{"n_reps", ProgramUniformVariableDataType::Uint32});
{"n_reps", ProgramUniformVariableDataType::Uint32},
{"is_first_prompt", ProgramUniformVariableDataType::Uint32});

WEBGPU_PROGRAM_DEFINE_OVERRIDABLE_CONSTANTS({"TILE_SIZE", ProgramConstantDataType::Uint32});

Expand Down
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