Use dependency injection for runner (#10326)

Summary:
Pull Request resolved: #10326

X-link: meta-pytorch/tokenizers#53

Pass in runner components, move most of the instantiation logic from `load()` to a new static API `create()`.

This adds testability to runner components.

Next step would be moving most of the logic out into `extension/llm/runner/` so that it can be used on non-llama models.

Currently the logic for getting tokenizer instance should not assume llama, which I can modify in next diff.

Differential Revision: D73165546

Author: larryliu0820

examples/demo-apps/apple_ios/LLaMA/LLaMARunner/LLaMARunner/Exported/LLaMARunner.mm

@@ -31,7 +31,7 @@ - (instancetype)initWithModelPath:(NSString*)modelPath
   self = [super init];
   if (self) {
     [ExecuTorchLog.sharedLog addSink:self];
-    _runner = std::make_unique<example::Runner>(
+    _runner = example::Runner::create(
         modelPath.UTF8String, tokenizerPath.UTF8String);
   }
   return self;

examples/models/llama/main.cpp

@@ -81,17 +81,18 @@ int32_t main(int32_t argc, char** argv) {
 #endif
   // create llama runner
   // @lint-ignore CLANGTIDY facebook-hte-Deprecated
-  example::Runner runner(model_path, tokenizer_path, data_path);
+  std::unique_ptr<example::Runner> runner =
+      example::Runner::create(model_path, tokenizer_path, data_path);
 
   if (warmup) {
     // @lint-ignore CLANGTIDY facebook-hte-Deprecated
-    runner.warmup(prompt, /*max_new_tokens=*/seq_len);
+    runner->warmup(prompt, /*max_new_tokens=*/seq_len);
   }
   // generate
   executorch::extension::llm::GenerationConfig config{
       .seq_len = seq_len, .temperature = temperature};
   // @lint-ignore CLANGTIDY facebook-hte-Deprecated
-  runner.generate(prompt, config);
+  runner->generate(prompt, config);
 
   return 0;
 }

examples/models/llama/runner/runner.cpp

@@ -4,16 +4,14 @@
  *
  * This source code is licensed under the BSD-style license found in the
  * LICENSE file in the root directory of this source tree.
+ * @lint-ignore-every CLANGTIDY facebook-hte-Deprecated
  */
 
 // A simple llama2 runner that includes preprocessing and post processing logic.
 // The module takes in a string as input and emits a string as output.
 
 #include <executorch/examples/models/llama/runner/runner.h>
 
-#include <algorithm>
-#include <ctime>
-
 #include <executorch/extension/llm/runner/util.h>
 
 #include <executorch/examples/models/llama/tokenizer/llama_tiktoken.h>
@@ -62,125 +60,155 @@ std::unique_ptr<::tokenizers::Tokenizer> load_tokenizer(
 }
 } // namespace
 
-Runner::Runner(
+std::unique_ptr<Runner> Runner::create(
     const std::string& model_path,
     const std::string& tokenizer_path,
-    std::optional<const std::string> data_path)
-    // NOTE: we observed ~2x loading performance increase on iPhone 15
-    // and a ~5% improvement on Galaxy S22 by switching to
-    // FileDataLoader instead of MmapDataLoader + UseMlockIgnoreErrors.
-    : tokenizer_path_(tokenizer_path),
-      metadata_({
-          {kEnableDynamicShape, false},
-          {kMaxSeqLen, 128},
-          {kMaxContextLen, 128},
-          {kUseKVCache, true},
-          {kUseSDPAWithKVCache, false},
-      }) {
-  if (data_path.has_value()) {
-    module_ = std::make_unique<Module>(
-        model_path, data_path.value(), Module::LoadMode::File);
-  } else {
-    module_ = std::make_unique<Module>(model_path, Module::LoadMode::File);
-  }
+    std::optional<const std::string> data_path,
+    float temperature) {
   ET_LOG(
       Info,
       "Creating LLaMa runner: model_path=%s, tokenizer_path=%s",
       model_path.c_str(),
       tokenizer_path.c_str());
-}
 
-[[deprecated(
-    "This constructor is deprecated. Use the constructor without temperature parameter instead.")]]
-Runner::Runner(
-    const std::string& model_path,
-    const std::string& tokenizer_path,
-    const float temperature,
-    std::optional<const std::string> data_path)
-    : Runner(model_path, tokenizer_path, std::move(data_path)) {
-  temperature_ = temperature;
-}
-
-bool Runner::is_loaded() const {
-  return module_->is_loaded() && tokenizer_ && text_decoder_runner_ &&
-      text_prefiller_ && text_token_generator_;
-}
-
-Error Runner::load() {
-  if (is_loaded()) {
-    return Error::Ok;
+  // Create the Module
+  std::unique_ptr<Module> module;
+  if (data_path.has_value()) {
+    module = std::make_unique<Module>(
+        model_path, data_path.value(), Module::LoadMode::File);
+  } else {
+    module = std::make_unique<Module>(model_path, Module::LoadMode::File);
   }
-  ET_CHECK_OK_OR_RETURN_ERROR(module_->load_method("forward"));
 
-  // Load tokenizer.
-  tokenizer_ = load_tokenizer(tokenizer_path_);
-  if (tokenizer_ == nullptr) {
+  // Initialize metadata with default values
+  std::unordered_map<std::string, int64_t> metadata({
+      {kEnableDynamicShape, false},
+      {kMaxSeqLen, 128},
+      {kMaxContextLen, 128},
+      {kUseKVCache, true},
+      {kUseSDPAWithKVCache, false},
+  });
+
+  // Create and load tokenizer
+  std::unique_ptr<::tokenizers::Tokenizer> tokenizer =
+      load_tokenizer(tokenizer_path);
+
+  // Fallback to BPE tokenizer if tiktoken fails
+  if (tokenizer == nullptr) {
     ET_LOG(
         Info,
-        "Failed to load %s as a Tiktoken artifact, trying BPE tokenizer",
-        tokenizer_path_.c_str());
-    tokenizer_.reset();
-    // @lint-ignore CLANGTIDY facebook-hte-Deprecated
-    tokenizer_ = std::make_unique<::tokenizers::Llama2cTokenizer>();
-    auto err = tokenizer_->load(tokenizer_path_);
-    ET_CHECK_TK_OK_OR_RETURN_ERROR(
-        err,
-        "Failed to load %s as a llama2.c tokenizer artifact",
-        tokenizer_path_.c_str());
-    return ::executorch::runtime::Error::InvalidArgument;
+        "Failed to load %s as a Tiktoken, Sentencepiece or Llama2.c tokenizer, make sure the artifact is one of these types",
+        tokenizer_path.c_str());
+    return nullptr;
   }
 
   ET_LOG(Info, "Reading metadata from model");
 
-  metadata_[kBosId] = tokenizer_->bos_tok();
+  // Set tokenizer-related metadata
+  metadata[kBosId] = tokenizer->bos_tok();
   auto eos_ids = std::make_unique<std::unordered_set<uint64_t>>(
-      std::unordered_set<uint64_t>{tokenizer_->eos_tok()});
-  metadata_[kVocabSize] = tokenizer_->vocab_size();
-
-  const auto method_names =
-      ET_UNWRAP(module_->method_names(), "Failed reading method names");
+      std::unordered_set<uint64_t>{tokenizer->eos_tok()});
+  metadata[kVocabSize] = tokenizer->vocab_size();
+
+  // Read metadata from the model
+  auto method_names_result = module->method_names();
+  if (method_names_result.error() != Error::Ok) {
+    ET_LOG(Error, "Failed reading method names");
+    return nullptr;
+  }
+  const auto method_names = method_names_result.get();
 
-  for (auto& pair : metadata_) {
+  for (auto& pair : metadata) {
     const auto& method_name = pair.first;
     auto& value = pair.second;
 
     if (method_names.count(method_name)) {
-      value = ET_UNWRAP(module_->get(method_name))
-                  .toScalar()
-                  .to<decltype(metadata_)::mapped_type>();
+      auto get_result = module->get(method_name);
+      value = get_result.get().toScalar().to<decltype(metadata)::mapped_type>();
     } else {
       ET_LOG(
           Info,
-          "Methond %s not found, using the default value %" PRId64,
+          "Method %s not found, using the default value %" PRId64,
           method_name.c_str(),
           value);
     }
     ET_LOG(Info, "Metadata: %s = %" PRId64, method_name.c_str(), value);
   }
+
+  // Get EOS IDs if available
   if (method_names.count(kEosIds)) {
     eos_ids->clear();
-    for (const auto& eos_id : ET_UNWRAP(module_->execute(kEosIds))) {
+    auto execute_result = module->execute(kEosIds);
+    if (execute_result.error() != Error::Ok) {
+      ET_LOG(Error, "Failed to execute %s", kEosIds);
+      return nullptr;
+    }
+    for (const auto& eos_id : execute_result.get()) {
       auto value = eos_id.toScalar().to<int64_t>();
       eos_ids->emplace(value);
       ET_LOG(Info, "eos_id = %" PRId64, value);
     }
   }
-  // @lint-ignore CLANGTIDY facebook-hte-Deprecated
-  text_decoder_runner_ = std::make_unique<llm::TextDecoderRunner>(
-      module_.get(), metadata_.at(kUseKVCache));
-  text_prefiller_ = std::make_unique<llm::TextPrefiller>(
-      text_decoder_runner_.get(),
-      metadata_.at(kUseKVCache),
-      metadata_.at(kEnableDynamicShape),
-      metadata_.at(kMaxSeqLen));
-
-  text_token_generator_ = std::make_unique<llm::TextTokenGenerator>(
-      tokenizer_.get(),
-      text_decoder_runner_.get(),
-      metadata_.at(kUseKVCache),
+
+  // Create text_decoder_runner. Use a shared_ptr so that it can be shared with
+  // TextPrefiller and TextTokenGenerator
+  auto text_decoder_runner = std::make_unique<llm::TextDecoderRunner>(
+      module.get(), metadata.at(kUseKVCache));
+
+  // Create text_prefiller
+  auto text_prefiller = std::make_unique<llm::TextPrefiller>(
+      text_decoder_runner.get(),
+      metadata.at(kUseKVCache),
+      metadata.at(kEnableDynamicShape),
+      metadata.at(kMaxSeqLen));
+
+  // Create text_token_generator with stats
+  auto stats = std::make_unique<llm::Stats>();
+  auto text_token_generator = std::make_unique<llm::TextTokenGenerator>(
+      tokenizer.get(),
+      text_decoder_runner.get(),
+      metadata.at(kUseKVCache),
       std::move(eos_ids),
-      &stats_);
+      stats.get());
+
+  // Create and return the Runner instance
+  return std::make_unique<Runner>(
+      std::move(metadata),
+      std::move(tokenizer),
+      std::move(text_prefiller),
+      std::move(text_token_generator),
+      std::move(stats),
+      temperature);
+}
+
+Runner::Runner(
+    std::unordered_map<std::string, int64_t> metadata,
+    std::unique_ptr<::tokenizers::Tokenizer> tokenizer,
+    std::unique_ptr<::executorch::extension::llm::TextPrefiller> text_prefiller,
+    std::unique_ptr<::executorch::extension::llm::TextTokenGenerator>
+        text_token_generator,
+    std::unique_ptr<::executorch::extension::llm::Stats> stats,
+    float temperature)
+    : tokenizer_(std::move(tokenizer)),
+      metadata_(std::move(metadata)),
+      text_prefiller_(std::move(text_prefiller)),
+      text_token_generator_(std::move(text_token_generator)),
+      stats_(std::move(stats)),
+      temperature_(temperature) {
+  // Note: This constructor assumes that text_prefiller and text_token_generator
+  // already have references to the Module and TextDecoderRunner they need
+}
+
+bool Runner::is_loaded() const {
+  return text_prefiller_->is_loaded() && text_token_generator_->is_loaded();
+}
 
+Error Runner::load() {
+  if (is_loaded()) {
+    return Error::Ok;
+  }
+  ET_CHECK_OK_OR_RETURN_ERROR(text_prefiller_->load());
+  ET_CHECK_OK_OR_RETURN_ERROR(text_token_generator_->load());
   return Error::Ok;
 }
 
@@ -201,9 +229,9 @@ Error Runner::generate(
   // Use ones-initialized inputs.
   ET_CHECK_MSG(!prompt.empty(), "Prompt cannot be null");
   if (!is_loaded()) {
-    stats_.model_load_start_ms = llm::time_in_ms();
+    stats_->model_load_start_ms = llm::time_in_ms();
     ET_CHECK_OK_OR_RETURN_ERROR(load());
-    stats_.model_load_end_ms = llm::time_in_ms();
+    stats_->model_load_end_ms = llm::time_in_ms();
   }
 
   if (config.warming) {
@@ -229,7 +257,7 @@ Error Runner::generate(
   // First token time only measures the time it takes to encode the prompt and
   // return a response token.
 
-  stats_.inference_start_ms = llm::time_in_ms();
+  stats_->inference_start_ms = llm::time_in_ms();
   shouldStop_ = false;
 
   ::tokenizers::Result<std::vector<uint64_t>> encode_res = tokenizer_->encode(
@@ -270,8 +298,8 @@ Error Runner::generate(
   auto prefill_res = text_prefiller_->prefill(prompt_tokens, pos);
   ET_CHECK_OK_OR_RETURN_ERROR(prefill_res.error());
   uint64_t cur_token = prefill_res.get();
-  stats_.first_token_ms = llm::time_in_ms();
-  stats_.prompt_eval_end_ms = llm::time_in_ms();
+  stats_->first_token_ms = llm::time_in_ms();
+  stats_->prompt_eval_end_ms = llm::time_in_ms();
 
   // print the first token from prefill. No prev_token so use cur_token for it.
   wrapped_callback(
@@ -292,7 +320,7 @@ Error Runner::generate(
       temperature_ == -1.0f ? config.temperature : temperature_,
       wrapped_callback));
 
-  stats_.inference_end_ms = llm::time_in_ms();
+  stats_->inference_end_ms = llm::time_in_ms();
   if (!config.warming) {
     printf("\n");
   }
@@ -305,17 +333,17 @@ Error Runner::generate(
     RUNNER_ET_LOG(config.warming, "Max new tokens %i reached!", max_new_tokens);
   }
 
-  stats_.num_prompt_tokens = num_prompt_tokens;
-  stats_.num_generated_tokens = num_generated_tokens;
+  stats_->num_prompt_tokens = num_prompt_tokens;
+  stats_->num_generated_tokens = num_generated_tokens;
 
   if (config.warming) {
     ET_LOG(Info, "Warmup run finished!");
   } else {
     // Do not print report during warmup
-    ::executorch::llm::print_report(stats_);
+    ::executorch::llm::print_report(*stats_);
   }
   if (stats_callback) {
-    stats_callback(stats_);
+    stats_callback(*stats_);
   }
 
   return Error::Ok;