Import from GitHub.

PiperOrigin-RevId: 610595796

DEVELOPERS.md

@@ -70,3 +70,21 @@ The implementation code is roughly split into 4 layers, from high to low level:
 
 4.  Backend (`highway`) - Low-level hardware interface (SIMD in the case of
     highway) supporting the implementations in (3).
+
+## Compile-Time Flags (Advanced)
+
+There are several compile-time flags to be aware of (note these may or may not 
+be exposed to the build system):
+
+- `GEMMA_WEIGHT_T` : Sets the level of compression for weights (surfaced as 
+  WEIGHT_TYPE in CMakeLists.txt). Currently this should be set to `SfpStream` 
+  (default, if no flag is specified) for 8-bit SFP, or `hwy::bfloat16_t` to 
+  enable for higher-fidelity (but slower) bfloat16 support. This is defined in
+  `gemma.h`.
+- `GEMMA_MAX_SEQ_LEN` : Sets maximum sequence length to preallocate for the KV
+  Cache. The default is 4096 tokens but can be overridden. This is not exposed
+  through `CMakeLists.txt` yet. 
+
+In the medium term both of these will likely be deprecated in favor of handling
+options at runtime - allowing for multiple weight compression schemes in a single
+build and dynamically resizes the KV cache as needed.

README.md

@@ -114,8 +114,12 @@ convenient directory location (e.g. the `build/` directory in this repo).
 
 The build system uses [CMake](https://cmake.org/). To build the gemma inference
 runtime, create a build directory and generate the build files using `cmake`
-from the top-level project directory. For the 8-bit switched floating point
+from the top-level project directory. Note if you previous ran `cmake` and are
-weights (sfp), run cmake with no options:
+re-running with a different setting, be sure to clean out the `build/` directory
+with `rm -rf build/*` (warning this will delete any other files in the `build/` 
+directory.
+
+For the 8-bit switched floating point weights (sfp), run cmake with no options:
 
 #### Unix-like Platforms
 ```sh

configs.h

@@ -18,21 +18,26 @@
 #ifndef THIRD_PARTY_GEMMA_CPP_CONFIGS_H_
 #define THIRD_PARTY_GEMMA_CPP_CONFIGS_H_
 
+// Allow changing pre-allocated kv cache size as a compiler flag
+#ifndef GEMMA_MAX_SEQLEN
+#define GEMMA_MAX_SEQLEN 4096
+#endif // !GEMMA_MAX_SEQLEN
+
 #include <stddef.h>
 
 namespace gcpp {
 
-static constexpr size_t kSeqLen = 7168;
+static constexpr size_t kSeqLen = GEMMA_MAX_SEQLEN;
 
 struct ConfigGemma7B {
   static constexpr int kSeqLen = gcpp::kSeqLen;
   static constexpr int kVocabSize = 256128;
   static constexpr int kLayers = 28;
   static constexpr int kModelDim = 3072;
-  static constexpr int kFFHiddenDim = 16 * 3072 / 2;  // = 24576
+  static constexpr int kFFHiddenDim = 16 * 3072 / 2; // = 24576
   static constexpr int kHeads = 16;
-  static constexpr int kKVHeads = 16;  // standard MHA, no GQA or MQA
+  static constexpr int kKVHeads = 16; // standard MHA
-  static constexpr int kQKVDim = 256;    // query size == key size == value size
+  static constexpr int kQKVDim = 256; // query size == key size == value size
   static constexpr int kTopK = 1;
 };
 
@@ -41,13 +46,13 @@ struct ConfigGemma2B {
   static constexpr int kVocabSize = 256128;
   static constexpr int kLayers = 18;
   static constexpr int kModelDim = 2048;
-  static constexpr int kFFHiddenDim = 16 * 2048 / 2;  // = 16384
+  static constexpr int kFFHiddenDim = 16 * 2048 / 2; // = 16384
   static constexpr int kHeads = 8;
   static constexpr int kKVHeads = 8;  // TODO(austinvhuang): add MQA support
-  static constexpr int kQKVDim = 256;   // query size == key size == value size
+  static constexpr int kQKVDim = 256; // query size == key size == value size
   static constexpr int kTopK = 1;
 };
 
-}  // namespace gcpp
+} // namespace gcpp
 
-#endif  // THIRD_PARTY_GEMMA_CPP_CONFIGS_H_
+#endif // THIRD_PARTY_GEMMA_CPP_CONFIGS_H_

gemma.h

@@ -42,7 +42,7 @@ namespace gcpp {
 // float, hwy::bfloat16_t, SfpStream, NuqStream
 #ifndef GEMMA_WEIGHT_T
 #define GEMMA_WEIGHT_T SfpStream
-#endif  // !GEMMA_WEIGHT_T
+#endif // !GEMMA_WEIGHT_T
 using WeightT = GEMMA_WEIGHT_T;
 
 using EmbedderInputT = hwy::bfloat16_t;
@@ -51,9 +51,9 @@ constexpr bool kSystemPrompt = false;
 
 struct KVCache {
   hwy::AlignedFreeUniquePtr<float[]>
-      key_cache;  // batch_size * kSeqLen * kLayers * kKVHeads * kQKVDim
+      key_cache; // batch_size * kSeqLen * kLayers * kKVHeads * kQKVDim
   hwy::AlignedFreeUniquePtr<float[]>
-      value_cache;  // batch_size * kSeqLen * kLayers * kKVHeads * kQKVDim
+      value_cache; // batch_size * kSeqLen * kLayers * kKVHeads * kQKVDim
 };
 
 // Model variants: see configs.h for details.
@@ -61,9 +61,9 @@ enum class Model { GEMMA_2B, GEMMA_7B };
 enum class ModelTraining { GEMMA_IT, GEMMA_PT };
 
 struct LoaderArgs : public ArgsBase<LoaderArgs> {
-  LoaderArgs(int argc, char* argv[]) { InitAndParse(argc, argv); }
+  LoaderArgs(int argc, char *argv[]) { InitAndParse(argc, argv); }
 
-  static std::string ToLower(const std::string& text) {
+  static std::string ToLower(const std::string &text) {
     std::string result = text;
     std::transform(begin(result), end(result), begin(result),
                    [](unsigned char c) { return std::tolower(c); });
@@ -89,7 +89,7 @@ struct LoaderArgs : public ArgsBase<LoaderArgs> {
   }
 
   // Returns error string or nullptr if OK.
-  const char* Validate() const {
+  const char *Validate() const {
     const std::string model_type_lc = ToLower(model_type);
     if (model_type_lc != "2b-pt" && model_type_lc != "7b-pt" &&
         model_type_lc != "2b-it" && model_type_lc != "7b-it") {
@@ -111,12 +111,11 @@ struct LoaderArgs : public ArgsBase<LoaderArgs> {
   }
 
   Path tokenizer;
-  Path model;  // uncompressed weights OR
+  Path model; // uncompressed weights OR
-  Path cache;  // compressed weights
+  Path cache; // compressed weights
   std::string model_type;
 
-  template <class Visitor>
+  template <class Visitor> void ForEach(const Visitor &visitor) {
-  void ForEach(const Visitor& visitor) {
     visitor(tokenizer, "tokenizer", Path(),
             "Path name of tokenizer model file. (required)");
     visitor(
@@ -139,10 +138,10 @@ struct LoaderArgs : public ArgsBase<LoaderArgs> {
 struct GemmaInterface;
 
 struct Gemma {
-  Gemma(const LoaderArgs& args, hwy::ThreadPool& pool);
+  Gemma(const LoaderArgs &args, hwy::ThreadPool &pool);
-  ~Gemma();  // must be defined after GemmaInterface's dtor is defined.
+  ~Gemma(); // must be defined after GemmaInterface's dtor is defined.
 
-  const sentencepiece::SentencePieceProcessor& Tokenizer() const;
+  const sentencepiece::SentencePieceProcessor &Tokenizer() const;
 
   std::unique_ptr<GemmaInterface> impl_;
   gcpp::ModelTraining model_training;
@@ -154,7 +153,7 @@ using StreamFunc = std::function<bool(int, float)>;
 using AcceptFunc = std::function<bool(int)>;
 
 struct InferenceArgs : public ArgsBase<InferenceArgs> {
-  InferenceArgs(int argc, char* argv[]) { InitAndParse(argc, argv); }
+  InferenceArgs(int argc, char *argv[]) { InitAndParse(argc, argv); }
 
   size_t max_tokens;
   size_t max_generated_tokens;
@@ -164,7 +163,7 @@ struct InferenceArgs : public ArgsBase<InferenceArgs> {
   bool multiturn;
 
   // Returns error string or nullptr if OK.
-  const char* Validate() const {
+  const char *Validate() const {
     if (max_tokens > gcpp::kSeqLen) {
       return "max_tokens is larger than the maximum sequence length (see "
              "configs.h).";
@@ -176,8 +175,7 @@ struct InferenceArgs : public ArgsBase<InferenceArgs> {
     return nullptr;
   }
 
-  template <class Visitor>
+  template <class Visitor> void ForEach(const Visitor &visitor) {
-  void ForEach(const Visitor& visitor) {
     visitor(max_tokens, "max_tokens", size_t{3072},
             "Maximum number of tokens in prompt + generation.");
     visitor(max_generated_tokens, "max_generated_tokens", size_t{2048},
@@ -186,22 +184,21 @@ struct InferenceArgs : public ArgsBase<InferenceArgs> {
     visitor(temperature, "temperature", 1.0f, "Temperature for top-K", 2);
     visitor(deterministic, "deterministic", false,
             "Make top-k sampling deterministic", 2);
-    visitor(multiturn, "multiturn", true,
+    visitor(multiturn, "multiturn", false,
             "Multiturn mode (if 0, this clears the KV cache after every "
-            "interaction without quitting)",
+            "interaction without quitting)\n    Default = 0 (conversation resets every turn)");
-            2);
   }
 };
 
-void GenerateGemma(Gemma& gemma, const InferenceArgs& args,
+void GenerateGemma(Gemma &gemma, const InferenceArgs &args,
-                   const std::vector<int>& prompt, size_t start_pos,
+                   const std::vector<int> &prompt, size_t start_pos,
-                   hwy::ThreadPool& pool, hwy::ThreadPool& inner_pool,
+                   hwy::ThreadPool &pool, hwy::ThreadPool &inner_pool,
-                   const StreamFunc& stream_token,
+                   const StreamFunc &stream_token,
-                   const AcceptFunc& accept_token, std::mt19937& g,
+                   const AcceptFunc &accept_token, std::mt19937 &g,
                    int verbosity);
 
 constexpr int EOS_ID = 1;
 
-}  // namespace gcpp
+} // namespace gcpp
 
-#endif  // THIRD_PARTY_GEMMA_CPP_GEMMA_H_
+#endif // THIRD_PARTY_GEMMA_CPP_GEMMA_H_