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674 lines (597 loc) · 24.2 KB
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#include "engine/framework/sampling/flow_sampler_runtime.h"
#include <algorithm>
#include <cstddef>
#include <stdexcept>
#include <utility>
namespace engine::modules {
namespace {
int64_t element_count(const std::vector<int64_t> & shape) {
if (shape.empty()) {
return 0;
}
int64_t count = 1;
for (const int64_t dim : shape) {
if (dim <= 0) {
return 0;
}
count *= dim;
}
return count;
}
bool has_duplicate_cache_name(const std::vector<FlowSamplerCacheSpec> & values) {
for (size_t i = 0; i < values.size(); ++i) {
for (size_t j = i + 1; j < values.size(); ++j) {
if (values[i].name == values[j].name) {
return true;
}
}
}
return false;
}
bool has_duplicate_branch_name(const std::vector<FlowSamplerBranchSpec> & values) {
for (size_t i = 0; i < values.size(); ++i) {
for (size_t j = i + 1; j < values.size(); ++j) {
if (values[i].name == values[j].name) {
return true;
}
}
}
return false;
}
bool has_duplicate_prediction(const std::vector<FlowSamplerBranchPrediction> & values) {
for (size_t i = 0; i < values.size(); ++i) {
for (size_t j = i + 1; j < values.size(); ++j) {
if (values[i].branch == values[j].branch) {
return true;
}
}
}
return false;
}
bool has_duplicate_cache_update(const std::vector<FlowSamplerCacheUpdate> & values) {
for (size_t i = 0; i < values.size(); ++i) {
for (size_t j = i + 1; j < values.size(); ++j) {
if (values[i].name == values[j].name) {
return true;
}
}
}
return false;
}
bool cache_key_matches_config(
const std::vector<FlowSamplerCacheKey> & key,
const std::vector<FlowSamplerCacheSpec> & config) {
if (key.size() != config.size()) {
return false;
}
for (const auto & spec : config) {
const auto it = std::find_if(key.begin(), key.end(), [&](const FlowSamplerCacheKey & state) {
return state.name == spec.name && state.mode == spec.mode;
});
if (it == key.end()) {
return false;
}
}
return true;
}
const FlowSamplerBranchPrediction & require_prediction(
const std::vector<FlowSamplerBranchPrediction> & predictions,
const std::string & branch,
const std::string & label) {
const auto it = std::find_if(predictions.begin(), predictions.end(), [&](const FlowSamplerBranchPrediction & pred) {
return pred.branch == branch;
});
if (it == predictions.end()) {
throw std::runtime_error(label + " missing prediction for branch '" + branch + "'");
}
return *it;
}
} // namespace
bool FlowSamplerCacheKey::operator==(const FlowSamplerCacheKey & other) const {
return name == other.name && mode == other.mode;
}
bool FlowSamplerCacheState::operator==(const FlowSamplerCacheState & other) const {
return name == other.name &&
mode == other.mode &&
revision == other.revision &&
initialized == other.initialized;
}
bool FlowSamplerGraphKey::operator==(const FlowSamplerGraphKey & other) const {
return latent_shape == other.latent_shape &&
branch_count == other.branch_count &&
schedule_steps == other.schedule_steps &&
sampler_mode == other.sampler_mode &&
caches == other.caches &&
modulation_revision == other.modulation_revision;
}
FlowSamplerDenoiserRuntime::~FlowSamplerDenoiserRuntime() = default;
FlowSamplerUpdateRuntime::~FlowSamplerUpdateRuntime() = default;
class FlowSamplerEulerUpdate final : public FlowSamplerUpdateRuntime {
public:
void update_latent(const FlowSamplerUpdateInput & input) override {
const float dt = input.state.schedule.t_next - input.state.schedule.t;
if (input.prediction.size() != input.latent.size()) {
throw std::runtime_error("FlowSampler Euler update prediction shape mismatch");
}
for (size_t i = 0; i < input.latent.size(); ++i) {
input.latent[i] += dt * input.prediction[i];
}
}
};
std::unique_ptr<FlowSamplerUpdateRuntime> make_flow_sampler_euler_update() {
return std::make_unique<FlowSamplerEulerUpdate>();
}
FlowSamplerSingleBranchDenoiserRuntime::FlowSamplerSingleBranchDenoiserRuntime(
FlowSamplerSingleBranchDenoiserRuntimeConfig config)
: config_(std::move(config)) {
if (config_.label.empty()) {
throw std::runtime_error("FlowSampler single-branch denoiser requires label");
}
if (config_.branch_name.empty()) {
throw std::runtime_error(config_.label + " requires branch name");
}
}
FlowSamplerSingleBranchDenoiserRuntime::~FlowSamplerSingleBranchDenoiserRuntime() = default;
void FlowSamplerSingleBranchDenoiserRuntime::reset_sampler_caches(
const std::vector<FlowSamplerCacheState> & caches) {
reset_sequence_caches(caches);
}
std::vector<FlowSamplerCacheUpdate>
FlowSamplerSingleBranchDenoiserRuntime::begin_sampler_sequence(
const FlowSamplerSequenceState & state) {
sequence_latent_shape_ = state.latent_shape;
sequence_schedule_steps_ = static_cast<int64_t>(state.schedule.size());
return begin_sequence(state);
}
FlowSamplerGraphKey FlowSamplerSingleBranchDenoiserRuntime::sampler_graph_key(
const FlowSamplerStepState & state) {
FlowSamplerGraphKey key;
key.latent_shape = sequence_latent_shape_;
key.branch_count = static_cast<int64_t>(state.branches.size());
key.schedule_steps = sequence_schedule_steps_;
key.sampler_mode = sampler_mode(state);
for (const auto & cache : state.caches) {
key.caches.push_back({cache.name, cache.mode});
}
key.modulation_revision = modulation_revision(state);
return key;
}
void FlowSamplerSingleBranchDenoiserRuntime::rebuild_sampler_graph(
const FlowSamplerGraphKey & key,
const FlowSamplerStepState & state) {
rebuild_graph(key, state);
}
FlowSamplerDenoiserOutput FlowSamplerSingleBranchDenoiserRuntime::run_sampler_denoiser(
const FlowSamplerDenoiserInput & input) {
FlowSamplerDenoiserOutput output;
output.predictions.push_back({config_.branch_name, predict_branch(input)});
return output;
}
void FlowSamplerSingleBranchDenoiserRuntime::release_sampler_graphs() {
release_runtime_graphs();
}
void FlowSamplerSingleBranchDenoiserRuntime::reset_sequence_caches(
const std::vector<FlowSamplerCacheState> & caches) {
if (!caches.empty()) {
throw std::runtime_error(config_.label + " does not define cache reset handling");
}
}
std::vector<FlowSamplerCacheUpdate>
FlowSamplerSingleBranchDenoiserRuntime::begin_sequence(
const FlowSamplerSequenceState & state) {
if (!state.caches.empty()) {
throw std::runtime_error(config_.label + " does not define cache sequence handling");
}
return {};
}
int64_t FlowSamplerSingleBranchDenoiserRuntime::modulation_revision(
const FlowSamplerStepState &) const {
return 0;
}
void FlowSamplerSingleBranchDenoiserRuntime::release_runtime_graphs() {}
const FlowSamplerSingleBranchDenoiserRuntimeConfig &
FlowSamplerSingleBranchDenoiserRuntime::config() const noexcept {
return config_;
}
class SingleBranchFlowSamplerDenoiser final : public FlowSamplerSingleBranchDenoiserRuntime {
public:
explicit SingleBranchFlowSamplerDenoiser(FlowSamplerSingleBranchDenoiserConfig config)
: FlowSamplerSingleBranchDenoiserRuntime({config.label, config.branch_name}),
config_(std::move(config)) {
if (!config_.sampler_mode) {
throw std::runtime_error(config_.label + " requires sampler mode callback");
}
if (!config_.predict) {
throw std::runtime_error(config_.label + " requires prediction callback");
}
}
private:
void reset_sequence_caches(const std::vector<FlowSamplerCacheState> & caches) override {
if (config_.reset_caches) {
config_.reset_caches(caches);
return;
}
if (!caches.empty()) {
throw std::runtime_error(config_.label + " does not define cache reset handling");
}
}
std::vector<FlowSamplerCacheUpdate> begin_sequence(
const FlowSamplerSequenceState & state) override {
if (config_.begin_sequence) {
return config_.begin_sequence(state);
}
if (!state.caches.empty()) {
throw std::runtime_error(config_.label + " does not define cache sequence handling");
}
return {};
}
std::string sampler_mode(const FlowSamplerStepState & state) const override {
return config_.sampler_mode(state);
}
int64_t modulation_revision(const FlowSamplerStepState & state) const override {
if (config_.modulation_revision) {
return config_.modulation_revision(state);
}
return 0;
}
void rebuild_graph(
const FlowSamplerGraphKey & key,
const FlowSamplerStepState & state) override {
if (config_.rebuild_graph) {
config_.rebuild_graph(key, state);
}
}
std::vector<float> predict_branch(const FlowSamplerDenoiserInput & input) override {
return config_.predict(input);
}
void release_runtime_graphs() override {
if (config_.release_graphs) {
config_.release_graphs();
}
}
FlowSamplerSingleBranchDenoiserConfig config_;
};
std::unique_ptr<FlowSamplerDenoiserRuntime>
make_flow_sampler_single_branch_denoiser(FlowSamplerSingleBranchDenoiserConfig config) {
return std::make_unique<SingleBranchFlowSamplerDenoiser>(std::move(config));
}
class FlowSamplerRuntime::Impl {
public:
Impl(
FlowSamplerRuntimeConfig config,
std::unique_ptr<FlowSamplerDenoiserRuntime> denoiser,
std::unique_ptr<FlowSamplerUpdateRuntime> updater,
bool default_euler_updater)
: config_(std::move(config)),
denoiser_(std::move(denoiser)),
updater_(std::move(updater)) {
validate_config();
if (denoiser_ == nullptr) {
throw std::runtime_error(config_.label + " requires denoiser runtime");
}
if (updater_ == nullptr) {
throw std::runtime_error(config_.label + " requires latent update runtime");
}
if (default_euler_updater && config_.update_rule == FlowSamplerUpdateRule::Custom) {
throw std::runtime_error(config_.label + " custom update rule requires explicit latent update runtime");
}
latent_ = config_.initial_latent;
preserved_latent_ = config_.initial_latent;
cache_states_.reserve(config_.caches.size());
for (const auto & cache : config_.caches) {
cache_states_.push_back({cache.name, cache.mode, 0, false});
}
}
~Impl() {
release_runtime_graphs();
}
void run_sequence() {
if (config_.initial_latent.empty()) {
throw std::runtime_error(config_.label + " requires initial latent input");
}
run_sequence(config_.initial_latent);
}
void run_sequence(const std::vector<float> & initial_latent) {
validate_initial_latent(initial_latent);
reset_sequence_caches();
const auto begin_updates = denoiser_->begin_sampler_sequence(make_sequence_state());
apply_cache_updates(begin_updates);
latent_ = initial_latent;
preserved_latent_ = initial_latent;
for (int64_t i = 0; i < static_cast<int64_t>(config_.schedule.size()); ++i) {
auto state = make_step_state(i);
ensure_graph(state);
auto output = denoiser_->run_sampler_denoiser({state, latent_});
validate_denoiser_output(state, output);
const auto combined = combine_predictions(output.predictions);
apply_update(state, combined);
preserve_prefix();
apply_cache_updates(output.cache_updates);
}
if (config_.release_graph_after_sequence) {
release_runtime_graphs();
}
}
void release_runtime_graphs() {
if (denoiser_ != nullptr) {
denoiser_->release_sampler_graphs();
}
active_graph_key_.reset();
}
void reset_graph_reuse_state() {
active_graph_key_.reset();
}
void reset_runtime_caches() {
for (auto & state : cache_states_) {
++state.revision;
state.initialized = false;
}
denoiser_->reset_sampler_caches(cache_states_);
reset_graph_reuse_state();
}
const std::vector<float> & latent() const noexcept {
return latent_;
}
const FlowSamplerRuntimeConfig & config() const noexcept {
return config_;
}
const std::optional<FlowSamplerGraphKey> & active_graph_key() const noexcept {
return active_graph_key_;
}
const std::vector<FlowSamplerCacheState> & cache_states() const noexcept {
return cache_states_;
}
private:
void validate_config() const {
const int64_t latent_values = element_count(config_.latent_shape);
if (config_.label.empty()) {
throw std::runtime_error("FlowSamplerRuntime requires label");
}
if (latent_values <= 0) {
throw std::runtime_error(config_.label + " requires positive latent shape");
}
if (!config_.initial_latent.empty() &&
config_.initial_latent.size() != static_cast<size_t>(latent_values)) {
throw std::runtime_error(config_.label + " initial latent shape mismatch");
}
if (!config_.prefix.preserve_mask.empty() &&
config_.prefix.preserve_mask.size() != static_cast<size_t>(latent_values)) {
throw std::runtime_error(config_.label + " prefix preserve mask shape mismatch");
}
if (config_.schedule.empty()) {
throw std::runtime_error(config_.label + " requires non-empty schedule");
}
if (config_.branches.empty()) {
throw std::runtime_error(config_.label + " requires at least one branch");
}
if (has_duplicate_branch_name(config_.branches)) {
throw std::runtime_error(config_.label + " branch names must be unique");
}
for (const auto & branch : config_.branches) {
if (branch.name.empty()) {
throw std::runtime_error(config_.label + " branch name must not be empty");
}
}
if (config_.guidance.mode == FlowSamplerGuidanceMode::ClassifierFree) {
if (config_.guidance.cond_branch.empty() || config_.guidance.uncond_branch.empty()) {
throw std::runtime_error(config_.label + " CFG requires cond and uncond branches");
}
}
if (has_duplicate_cache_name(config_.caches)) {
throw std::runtime_error(config_.label + " cache names must be unique");
}
for (const auto & cache : config_.caches) {
if (cache.name.empty()) {
throw std::runtime_error(config_.label + " cache name must not be empty");
}
if (cache.mode.empty()) {
throw std::runtime_error(config_.label + " cache mode must not be empty");
}
}
}
void validate_initial_latent(const std::vector<float> & initial_latent) const {
const int64_t latent_values = element_count(config_.latent_shape);
if (initial_latent.size() != static_cast<size_t>(latent_values)) {
throw std::runtime_error(config_.label + " initial latent shape mismatch");
}
}
void validate_graph_key(const FlowSamplerGraphKey & key) const {
if (!config_.require_complete_graph_key) {
return;
}
if (key.latent_shape != config_.latent_shape) {
throw std::runtime_error(config_.label + " graph key latent shape mismatch");
}
if (key.branch_count != static_cast<int64_t>(config_.branches.size())) {
throw std::runtime_error(config_.label + " graph key branch count mismatch");
}
if (key.schedule_steps != static_cast<int64_t>(config_.schedule.size())) {
throw std::runtime_error(config_.label + " graph key schedule length mismatch");
}
if (key.sampler_mode.empty()) {
throw std::runtime_error(config_.label + " graph key requires sampler mode");
}
if (!cache_key_matches_config(key.caches, config_.caches)) {
throw std::runtime_error(config_.label + " graph key cache state mismatch");
}
}
FlowSamplerStepState make_step_state(int64_t sequence_index) const {
FlowSamplerStepState state;
state.sequence_index = sequence_index;
state.schedule = config_.schedule[static_cast<size_t>(sequence_index)];
state.branches = config_.branches;
state.caches = cache_states_;
return state;
}
FlowSamplerSequenceState make_sequence_state() const {
FlowSamplerSequenceState state;
state.latent_shape = config_.latent_shape;
state.schedule = config_.schedule;
state.branches = config_.branches;
state.caches = cache_states_;
return state;
}
void ensure_graph(FlowSamplerStepState & state) {
state.graph_key = denoiser_->sampler_graph_key(state);
validate_graph_key(state.graph_key);
if (!active_graph_key_.has_value() || *active_graph_key_ != state.graph_key) {
denoiser_->rebuild_sampler_graph(state.graph_key, state);
active_graph_key_ = state.graph_key;
}
}
void validate_denoiser_output(
const FlowSamplerStepState & state,
const FlowSamplerDenoiserOutput & output) const {
if (output.predictions.size() != state.branches.size()) {
throw std::runtime_error(config_.label + " denoiser branch count mismatch");
}
if (has_duplicate_prediction(output.predictions)) {
throw std::runtime_error(config_.label + " denoiser output contains duplicate branches");
}
for (const auto & prediction : output.predictions) {
const auto branch = std::find_if(state.branches.begin(), state.branches.end(), [&](const FlowSamplerBranchSpec & spec) {
return spec.name == prediction.branch;
});
if (branch == state.branches.end()) {
throw std::runtime_error(config_.label + " denoiser output references unknown branch '" + prediction.branch + "'");
}
if (prediction.values.size() != latent_.size()) {
throw std::runtime_error(config_.label + " denoiser prediction shape mismatch");
}
}
if (has_duplicate_cache_update(output.cache_updates)) {
throw std::runtime_error(config_.label + " denoiser output contains duplicate cache updates");
}
for (const auto & update : output.cache_updates) {
const auto it = std::find_if(config_.caches.begin(), config_.caches.end(), [&](const FlowSamplerCacheSpec & spec) {
return spec.name == update.name;
});
if (it == config_.caches.end()) {
throw std::runtime_error(config_.label + " denoiser output references unknown cache '" + update.name + "'");
}
}
}
std::vector<float> combine_predictions(const std::vector<FlowSamplerBranchPrediction> & predictions) const {
if (config_.guidance.mode == FlowSamplerGuidanceMode::None) {
if (predictions.size() != 1) {
throw std::runtime_error(config_.label + " unguided sampler expects exactly one prediction");
}
return predictions.front().values;
}
if (config_.guidance.mode == FlowSamplerGuidanceMode::ClassifierFree) {
const auto & cond = require_prediction(predictions, config_.guidance.cond_branch, config_.label);
const auto & uncond = require_prediction(predictions, config_.guidance.uncond_branch, config_.label);
std::vector<float> out(cond.values.size(), 0.0F);
for (size_t i = 0; i < out.size(); ++i) {
out[i] = uncond.values[i] + config_.guidance.scale * (cond.values[i] - uncond.values[i]);
}
return out;
}
throw std::runtime_error(config_.label + " unsupported guidance mode");
}
void apply_update(
const FlowSamplerStepState & state,
const std::vector<float> & prediction) {
if (config_.prediction_type != FlowSamplerPredictionType::Velocity) {
throw std::runtime_error(config_.label + " unsupported flow update");
}
if (config_.update_rule != FlowSamplerUpdateRule::Euler &&
config_.update_rule != FlowSamplerUpdateRule::Custom) {
throw std::runtime_error(config_.label + " unsupported flow update rule");
}
updater_->update_latent({state, prediction, latent_});
}
void preserve_prefix() {
if (config_.prefix.preserve_mask.empty()) {
return;
}
for (size_t i = 0; i < latent_.size(); ++i) {
if (config_.prefix.preserve_mask[i] != 0.0F) {
latent_[i] = preserved_latent_[i];
}
}
}
void reset_sequence_caches() {
for (size_t i = 0; i < config_.caches.size(); ++i) {
if (config_.caches[i].reset_on_sequence_begin) {
++cache_states_[i].revision;
cache_states_[i].initialized = false;
}
}
}
void apply_cache_updates(const std::vector<FlowSamplerCacheUpdate> & updates) {
for (const auto & update : updates) {
auto it = std::find_if(cache_states_.begin(), cache_states_.end(), [&](const FlowSamplerCacheState & state) {
return state.name == update.name;
});
if (it == cache_states_.end()) {
throw std::runtime_error(config_.label + " received update for unknown cache '" + update.name + "'");
}
switch (update.kind) {
case FlowSamplerCacheUpdateKind::Unchanged:
break;
case FlowSamplerCacheUpdateKind::Updated:
++it->revision;
it->initialized = true;
break;
case FlowSamplerCacheUpdateKind::Reset:
++it->revision;
it->initialized = false;
break;
}
}
}
FlowSamplerRuntimeConfig config_;
std::unique_ptr<FlowSamplerDenoiserRuntime> denoiser_;
std::unique_ptr<FlowSamplerUpdateRuntime> updater_;
std::optional<FlowSamplerGraphKey> active_graph_key_;
std::vector<FlowSamplerCacheState> cache_states_;
std::vector<float> latent_;
std::vector<float> preserved_latent_;
};
FlowSamplerRuntime::FlowSamplerRuntime(
FlowSamplerRuntimeConfig config,
std::unique_ptr<FlowSamplerDenoiserRuntime> denoiser)
: impl_(std::make_unique<Impl>(
std::move(config),
std::move(denoiser),
make_flow_sampler_euler_update(),
true)) {}
FlowSamplerRuntime::FlowSamplerRuntime(
FlowSamplerRuntimeConfig config,
std::unique_ptr<FlowSamplerDenoiserRuntime> denoiser,
std::unique_ptr<FlowSamplerUpdateRuntime> updater)
: impl_(std::make_unique<Impl>(
std::move(config),
std::move(denoiser),
std::move(updater),
false)) {}
FlowSamplerRuntime::~FlowSamplerRuntime() = default;
void FlowSamplerRuntime::run_sequence() {
impl_->run_sequence();
}
void FlowSamplerRuntime::run_sequence(const std::vector<float> & initial_latent) {
impl_->run_sequence(initial_latent);
}
void FlowSamplerRuntime::release_runtime_graphs() {
impl_->release_runtime_graphs();
}
void FlowSamplerRuntime::reset_graph_reuse_state() {
impl_->reset_graph_reuse_state();
}
void FlowSamplerRuntime::reset_runtime_caches() {
impl_->reset_runtime_caches();
}
const std::vector<float> & FlowSamplerRuntime::latent() const noexcept {
return impl_->latent();
}
const FlowSamplerRuntimeConfig & FlowSamplerRuntime::config() const noexcept {
return impl_->config();
}
const std::optional<FlowSamplerGraphKey> & FlowSamplerRuntime::active_graph_key() const noexcept {
return impl_->active_graph_key();
}
const std::vector<FlowSamplerCacheState> & FlowSamplerRuntime::cache_states() const noexcept {
return impl_->cache_states();
}
} // namespace engine::modules