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examples : iOS example with swift ui (#4159)

Browse Source 
* copy to llama.cpp as subdir

* attempt enabling metal, fails

* ggml metal compiles!

* Update README.md

* initial conversion to new format, utf8 errors?

* bug fixes, but now has an invalid memory access :(

* added O3, now has insufficient memory access

* begin sync with master

* update to match latest code, new errors

* fixed it!

* fix for loop conditionals, increase result size

* fix current workflow errors

* attempt a llama.swiftui workflow

* Update .github/workflows/build.yml

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>

---------

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
This commit is contained in:
Bailey Chittle 2023-11-27 09:56:52 -05:00 committed by GitHub
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11
.github/workflows/build.yml vendored
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@ -498,6 +498,17 @@ jobs:
path: |
cudart-llama-bin-win-cu${{ matrix.cuda }}-x64.zip
ios-xcode-build:
runs-on: macos-latest
steps:
- name: Checkout code
uses: actions/checkout@v3
- name: Build Xcode project
run: xcodebuild -project examples/llama.swiftui/llama.swiftui.xcodeproj -scheme llama.swiftui -sdk iphoneos CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY= -destination 'generic/platform=iOS' build
# freeBSD-latest:
# runs-on: macos-12
# steps:

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examples/llama.swiftui/.gitignore vendored Normal file
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@ -0,0 +1 @@
xcuserdata

7
examples/llama.swiftui/README.md Normal file
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# llama.swiftui
Local inference of llama.cpp on an iPhone.
So far I only tested with starcoder 1B model, but it can most likely handle 7B models as well.
https://github.com/bachittle/llama.cpp/assets/39804642/e290827a-4edb-4093-9642-2a5e399ec545

176
examples/llama.swiftui/llama.cpp.swift/LibLlama.swift Normal file
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@ -0,0 +1,176 @@
import Foundation
// import llama
enum LlamaError: Error {
case couldNotInitializeContext
}
actor LlamaContext {
private var model: OpaquePointer
private var context: OpaquePointer
private var batch: llama_batch
private var tokens_list: [llama_token]
var n_len: Int32 = 512
var n_cur: Int32 = 0
var n_decode: Int32 = 0
init(model: OpaquePointer, context: OpaquePointer) {
self.model = model
self.context = context
self.tokens_list = []
self.batch = llama_batch_init(512, 0, 1)
}
deinit {
llama_free(context)
llama_free_model(model)
llama_backend_free()
}
static func createContext(path: String) throws -> LlamaContext {
llama_backend_init(false)
let model_params = llama_model_default_params()
let model = llama_load_model_from_file(path, model_params)
guard let model else {
print("Could not load model at \(path)")
throw LlamaError.couldNotInitializeContext
}
var ctx_params = llama_context_default_params()
ctx_params.seed = 1234
ctx_params.n_ctx = 2048
ctx_params.n_threads = 8
ctx_params.n_threads_batch = 8
let context = llama_new_context_with_model(model, ctx_params)
guard let context else {
print("Could not load context!")
throw LlamaError.couldNotInitializeContext
}
return LlamaContext(model: model, context: context)
}
func get_n_tokens() -> Int32 {
return batch.n_tokens;
}
func completion_init(text: String) {
print("attempting to complete \"\(text)\"")
tokens_list = tokenize(text: text, add_bos: true)
let n_ctx = llama_n_ctx(context)
let n_kv_req = tokens_list.count + (Int(n_len) - tokens_list.count)
print("\n n_len = \(n_len), n_ctx = \(n_ctx), n_kv_req = \(n_kv_req)")
if n_kv_req > n_ctx {
print("error: n_kv_req > n_ctx, the required KV cache size is not big enough")
}
for id in tokens_list {
print(token_to_piece(token: id))
}
// batch = llama_batch_init(512, 0) // done in init()
batch.n_tokens = Int32(tokens_list.count)
for i1 in 0..<batch.n_tokens {
let i = Int(i1)
batch.token[i] = tokens_list[i]
batch.pos[i] = i1
batch.n_seq_id[Int(i)] = 1
batch.seq_id[Int(i)]![0] = 0
batch.logits[i] = 0
}
batch.logits[Int(batch.n_tokens) - 1] = 1 // true
if llama_decode(context, batch) != 0 {
print("llama_decode() failed")
}
n_cur = batch.n_tokens
}
func completion_loop() -> String {
var new_token_id: llama_token = 0
let n_vocab = llama_n_vocab(model)
let logits = llama_get_logits_ith(context, batch.n_tokens - 1)
var candidates = Array<llama_token_data>()
candidates.reserveCapacity(Int(n_vocab))
for token_id in 0..<n_vocab {
candidates.append(llama_token_data(id: token_id, logit: logits![Int(token_id)], p: 0.0))
}
candidates.withUnsafeMutableBufferPointer() { buffer in
var candidates_p = llama_token_data_array(data: buffer.baseAddress, size: buffer.count, sorted: false)
new_token_id = llama_sample_token_greedy(context, &candidates_p)
}
if new_token_id == llama_token_eos(context) || n_cur == n_len {
print("\n")
return ""
}
let new_token_str = token_to_piece(token: new_token_id)
print(new_token_str)
// tokens_list.append(new_token_id)
batch.n_tokens = 0
batch.token[Int(batch.n_tokens)] = new_token_id
batch.pos[Int(batch.n_tokens)] = n_cur
batch.n_seq_id[Int(batch.n_tokens)] = 1
batch.seq_id[Int(batch.n_tokens)]![0] = 0
batch.logits[Int(batch.n_tokens)] = 1 // true
batch.n_tokens += 1
n_decode += 1
n_cur += 1
if llama_decode(context, batch) != 0 {
print("failed to evaluate llama!")
}
return new_token_str
}
func clear() {
tokens_list.removeAll()
}
private func tokenize(text: String, add_bos: Bool) -> [llama_token] {
let n_tokens = text.count + (add_bos ? 1 : 0)
let tokens = UnsafeMutablePointer<llama_token>.allocate(capacity: n_tokens)
let tokenCount = llama_tokenize(model, text, Int32(text.count), tokens, Int32(n_tokens), add_bos, false)
var swiftTokens: [llama_token] = []
for i in 0..<tokenCount {
swiftTokens.append(tokens[Int(i)])
}
tokens.deallocate()
return swiftTokens
}
private func token_to_piece(token: llama_token) -> String {
let result = UnsafeMutablePointer<Int8>.allocate(capacity: 8)
result.initialize(repeating: Int8(0), count: 8)
let _ = llama_token_to_piece(model, token, result, 8)
let resultStr = String(cString: result)
result.deallocate()
return resultStr
}
}

5
examples/llama.swiftui/llama.cpp.swift/bridging-header.h Normal file
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@ -0,0 +1,5 @@
//
// Use this file to import your target's public headers that you would like to expose to Swift.
//
#import "llama.h"

481
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examples/llama.swiftui/llama.swiftui.xcodeproj/project.xcworkspace/contents.xcworkspacedata generated Normal file
View File

@ -0,0 +1,7 @@
<?xml version="1.0" encoding="UTF-8"?>
<Workspace
version = "1.0">
<FileRef
location = "self:">
</FileRef>
</Workspace>

8
examples/llama.swiftui/llama.swiftui.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist Normal file
View File

@ -0,0 +1,8 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>IDEDidComputeMac32BitWarning</key>
<true/>
</dict>
</plist>

11
examples/llama.swiftui/llama.swiftui/Assets.xcassets/AccentColor.colorset/Contents.json Normal file
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@ -0,0 +1,11 @@
{
"colors" : [
{
"idiom" : "universal"
}
],
"info" : {
"author" : "xcode",
"version" : 1
}
}

13
examples/llama.swiftui/llama.swiftui/Assets.xcassets/AppIcon.appiconset/Contents.json Normal file
View File

@ -0,0 +1,13 @@
{
"images" : [
{
"idiom" : "universal",
"platform" : "ios",
"size" : "1024x1024"
}
],
"info" : {
"author" : "xcode",
"version" : 1
}
}

6
examples/llama.swiftui/llama.swiftui/Assets.xcassets/Contents.json Normal file
View File

@ -0,0 +1,6 @@
{
"info" : {
"author" : "xcode",
"version" : 1
}
}

45
examples/llama.swiftui/llama.swiftui/Models/LlamaState.swift Normal file
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@ -0,0 +1,45 @@
import Foundation
@MainActor
class LlamaState: ObservableObject {
@Published var messageLog = ""
private var llamaContext: LlamaContext?
private var modelUrl: URL? {
Bundle.main.url(forResource: "q8_0", withExtension: "gguf", subdirectory: "models")
// Bundle.main.url(forResource: "llama-2-7b-chat", withExtension: "Q2_K.gguf", subdirectory: "models")
}
init() {
do {
try loadModel()
} catch {
messageLog += "Error!\n"
}
}
private func loadModel() throws {
messageLog += "Loading model...\n"
if let modelUrl {
llamaContext = try LlamaContext.createContext(path: modelUrl.path())
messageLog += "Loaded model \(modelUrl.lastPathComponent)\n"
} else {
messageLog += "Could not locate model\n"
}
}
func complete(text: String) async {
guard let llamaContext else {
return
}
messageLog += "Attempting to complete text...\n"
await llamaContext.completion_init(text: text)
messageLog += "\(text)"
while await llamaContext.n_cur <= llamaContext.n_len {
let result = await llamaContext.completion_loop()
messageLog += "\(result)"
}
await llamaContext.clear()
messageLog += "\n\ndone\n"
}
}

6
examples/llama.swiftui/llama.swiftui/Preview Content/Preview Assets.xcassets/Contents.json Normal file
View File

@ -0,0 +1,6 @@
{
"info" : {
"author" : "xcode",
"version" : 1
}
}

0
examples/llama.swiftui/llama.swiftui/Resources/models/.gitignore vendored Normal file
View File

42
examples/llama.swiftui/llama.swiftui/UI/ContentView.swift Normal file
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@ -0,0 +1,42 @@
import SwiftUI
struct ContentView: View {
@StateObject var llamaState = LlamaState()
@State private var multiLineText = ""
var body: some View {
VStack {
ScrollView(.vertical) {
Text(llamaState.messageLog)
}
TextEditor(text: $multiLineText)
.frame(height: 200)
.padding()
.border(Color.gray, width: 0.5)
Button(action: {
sendText()
}) {
Text("Send")
.padding()
.background(Color.blue)
.foregroundColor(.white)
.cornerRadius(8)
}
}
.padding()
}
func sendText() {
Task {
await llamaState.complete(text: multiLineText)
multiLineText = ""
}
}
}
/*
#Preview {
ContentView()
}
*/

10
examples/llama.swiftui/llama.swiftui/llama_swiftuiApp.swift Normal file
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@ -0,0 +1,10 @@
import SwiftUI
@main
struct llama_swiftuiApp: App {
var body: some Scene {
WindowGroup {
ContentView()
}
}
}