feat: expose n_ubatch and dynamically adjust ntokens for bench (#104)

* feat: expose n_ubatch in the context params

* feat: limit max tokens by n_ubatch in bench

Author: a-ghorbani

android/src/main/java/com/rnllama/LlamaContext.java

@@ -50,6 +50,8 @@ public LlamaContext(int id, ReactApplicationContext reactContext, ReadableMap pa
       params.hasKey("n_ctx") ? params.getInt("n_ctx") : 512,
       // int n_batch,
       params.hasKey("n_batch") ? params.getInt("n_batch") : 512,
+      // int n_ubatch,
+      params.hasKey("n_ubatch") ? params.getInt("n_ubatch") : 512,
       // int n_threads,
       params.hasKey("n_threads") ? params.getInt("n_threads") : 0,
       // int n_gpu_layers, // TODO: Support this
@@ -412,6 +414,7 @@ protected static native long initContext(
     int embd_normalize,
     int n_ctx,
     int n_batch,
+    int n_ubatch,
     int n_threads,
     int n_gpu_layers, // TODO: Support this
     boolean flash_attn,

android/src/main/jni.cpp

@@ -226,6 +226,7 @@ Java_com_rnllama_LlamaContext_initContext(
     jint embd_normalize,
     jint n_ctx,
     jint n_batch,
+    jint n_ubatch,
     jint n_threads,
     jint n_gpu_layers, // TODO: Support this
     jboolean flash_attn,
@@ -256,6 +257,7 @@ Java_com_rnllama_LlamaContext_initContext(
 
     defaultParams.n_ctx = n_ctx;
     defaultParams.n_batch = n_batch;
+    defaultParams.n_ubatch = n_ubatch;
 
     if (pooling_type != -1) {
         defaultParams.pooling_type = static_cast<enum llama_pooling_type>(pooling_type);

cpp/rn-llama.hpp

@@ -683,7 +683,11 @@ struct llama_rn_context
         double tg_std = 0;
 
         // TODO: move batch into llama_rn_context (related https://github.com/mybigday/llama.rn/issues/30)
-        llama_batch batch = llama_batch_init(512, 0, 1);
+        llama_batch batch = llama_batch_init(
+            std::min(pp, params.n_ubatch), // max n_tokens is limited by n_ubatch
+            0,                         // No embeddings
+            1                          // Single sequence
+        );
 
         for (int i = 0; i < nr; i++)
         {

ios/RNLlamaContext.mm

@@ -94,6 +94,7 @@ + (instancetype)initWithParams:(NSDictionary *)params onProgress:(void (^)(unsig
 #endif
     }
     if (params[@"n_batch"]) defaultParams.n_batch = [params[@"n_batch"] intValue];
+    if (params[@"n_ubatch"]) defaultParams.n_ubatch = [params[@"n_ubatch"] intValue];
     if (params[@"use_mmap"]) defaultParams.use_mmap = [params[@"use_mmap"] boolValue];
 
     if (params[@"pooling_type"] && [params[@"pooling_type"] isKindOfClass:[NSNumber class]]) {

src/NativeRNLlama.ts

@@ -12,6 +12,7 @@ export type NativeContextParams = {
 
   n_ctx?: number
   n_batch?: number
+  n_ubatch?: number
 
   n_threads?: number
   n_gpu_layers?: number