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LLM.mm
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#import "LLM.h"
#import <ExecutorchLib/LLaMARunner.h>
#import "utils/llms/ConversationManager.h"
#import "utils/llms/Constants.h"
#import "utils/Fetcher.h"
#import "utils/LargeFileFetcher.h"
#import <UIKit/UIKit.h>
#import <string>
#import <React/RCTBridge+Private.h>
#import <React/RCTBridge.h>
#import <React/RCTBridgeModule.h>
#import <React/RCTUtils.h>
#import <ReactCommon/CallInvoker.h>
#import <ReactCommon/RCTTurboModule.h>
#import <react/renderer/uimanager/primitives.h>
@implementation LLM {
LLaMARunner *runner;
ConversationManager *conversationManager;
NSMutableString *tempLlamaResponse;
BOOL isFetching;
}
- (instancetype)init {
self = [super init];
if(self) {
isFetching = NO;
tempLlamaResponse = [[NSMutableString alloc] init];
}
return self;
}
RCT_EXPORT_MODULE()
- (void)onResult:(NSString *)token prompt:(NSString *)prompt {
if ([token isEqualToString:prompt]) {
return;
}
dispatch_async(dispatch_get_main_queue(), ^{
[self emitOnToken:token];
[self->tempLlamaResponse appendString:token];
});
}
- (void)updateDownloadProgress:(NSNumber *)progress {
dispatch_async(dispatch_get_main_queue(), ^{
[self emitOnDownloadProgress:progress];
});
}
- (void)loadLLM:(NSString *)modelSource tokenizerSource:(NSString *)tokenizerSource systemPrompt:(NSString *)systemPrompt contextWindowLength:(double)contextWindowLength resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject {
NSURL *modelURL = [NSURL URLWithString:modelSource];
NSURL *tokenizerURL = [NSURL URLWithString:tokenizerSource];
if(self->runner || isFetching){
reject(@"model_already_loaded", @"Model and tokenizer already loaded", nil);
return;
}
isFetching = YES;
[Fetcher fetchResource:tokenizerURL resourceType:ResourceType::TOKENIZER completionHandler:^(NSString *tokenizerFilePath, NSError *error) {
if(error){
reject(@"download_error", error.localizedDescription, nil);
return;
}
LargeFileFetcher *modelFetcher = [[LargeFileFetcher alloc] init];
modelFetcher.onProgress = ^(NSNumber *progress) {
[self updateDownloadProgress:progress];
};
modelFetcher.onFailure = ^(NSError *error){
reject(@"download_error", error.localizedDescription, nil);
return;
};
modelFetcher.onFinish = ^(NSString *modelFilePath) {
self->runner = [[LLaMARunner alloc] initWithModelPath:modelFilePath tokenizerPath:tokenizerFilePath];
NSUInteger contextWindowLengthUInt = (NSUInteger)round(contextWindowLength);
self->conversationManager = [[ConversationManager alloc] initWithNumMessagesContextWindow: contextWindowLengthUInt systemPrompt: systemPrompt];
self->isFetching = NO;
resolve(@"Model and tokenizer loaded successfully");
return;
};
[modelFetcher startDownloadingFileFromURL:modelURL];
}];
}
- (void) runInference:(NSString *)input resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject {
[conversationManager addResponse:input senderRole:ChatRole::USER];
NSString *prompt = [conversationManager getConversation];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSError *error = nil;
[self->runner generate:prompt withTokenCallback:^(NSString *token) {
[self onResult:token prompt:prompt];
} error:&error];
// make sure to add eot token once generation is done
if (![self->tempLlamaResponse hasSuffix:END_OF_TEXT_TOKEN_NS]) {
[self onResult:END_OF_TEXT_TOKEN_NS prompt:prompt];
}
if (self->tempLlamaResponse) {
[self->conversationManager addResponse:self->tempLlamaResponse senderRole:ChatRole::ASSISTANT];
self->tempLlamaResponse = [NSMutableString string];
}
if (error) {
reject(@"error_in_generation", error.localizedDescription, nil);
return;
}
resolve(@"Inference completed successfully");
return;
});
}
-(void)interrupt {
[self->runner stop];
}
-(void)deleteModule {
self->runner = nil;
}
- (std::shared_ptr<facebook::react::TurboModule>)getTurboModule:(const facebook::react::ObjCTurboModule::InitParams &)params
{
return std::make_shared<facebook::react::NativeLLMSpecJSI>(params);
}
@end