Metal quantized modifications proposal.

- Add a device param, wherever needed.
- Create new QMetal storage thing that implements QuantizedType.
- Update everywhere needed.

Fix Python.

Fixing examples.

Fix: fmt + clippy + stub.

Moving everything around.

Only missing the actual implems.

Fixing everything + adding dequantized kernels.

More work.

Fixing matmul.

Fmt + Clippy

Some clippy fixes.

Working state.

Q2K Metal -> Bugged (also present in GGML).
Q4K CPU -> Bugged (present previously, new test catch it).
Q5K CPU -> Bugged (present previously).
Q8_1 Both -> Never really implemented it seems
Q8K metal -> Never implemented in metal

Fixing Q2K bug (present in ggml).

candle-examples/examples/blip/main.rs

@@ -106,17 +106,17 @@ pub fn main() -> anyhow::Result<()> {
 
     let config = blip::Config::image_captioning_large();
 
+    let device = candle_examples::device(args.cpu)?;
     let (image_embeds, device, mut model) = if args.quantized {
         let device = Device::Cpu;
         let image = load_image(args.image)?.to_device(&device)?;
         println!("loaded image {image:?}");
 
-        let vb = quantized_blip::VarBuilder::from_gguf(model_file)?;
+        let vb = quantized_blip::VarBuilder::from_gguf(model_file, &device)?;
         let model = quantized_blip::BlipForConditionalGeneration::new(&config, vb)?;
         let image_embeds = image.unsqueeze(0)?.apply(model.vision_model())?;
         (image_embeds, device, Model::Q(model))
     } else {
-        let device = candle_examples::device(args.cpu)?;
         let image = load_image(args.image)?.to_device(&device)?;
         println!("loaded image {image:?}");
 

candle-examples/examples/llama2-c/main.rs

@@ -262,7 +262,7 @@ fn run_inference(args: &InferenceCmd, common_args: &Args) -> Result<()> {
         .extension()
         .map_or(false, |v| v == "safetensors");
     let (model, config) = if is_gguf {
-        let vb = qmodel::VarBuilder::from_gguf(config_path)?;
+        let vb = qmodel::VarBuilder::from_gguf(config_path, &device)?;
         let (_vocab_size, dim) = vb
             .get_no_shape("model.embed_tokens.weight")?
             .shape()
@@ -279,13 +279,13 @@ fn run_inference(args: &InferenceCmd, common_args: &Args) -> Result<()> {
                 (config.seq_len, config.head_size() / 2),
                 "rot.freq_cis_real",
             )?
-            .dequantize(&candle::Device::Cpu)?;
+            .dequantize(&device)?;
         let freq_cis_imag = vb
             .get(
                 (config.seq_len, config.head_size() / 2),
                 "rot.freq_cis_imag",
             )?
-            .dequantize(&candle::Device::Cpu)?;
+            .dequantize(&device)?;
 
         let fake_vb = candle_nn::VarBuilder::from_tensors(
             [
@@ -295,7 +295,7 @@ fn run_inference(args: &InferenceCmd, common_args: &Args) -> Result<()> {
             .into_iter()
             .collect(),
             candle::DType::F32,
-            &candle::Device::Cpu,
+            &device,
         );
         let cache = model::Cache::new(true, &config, fake_vb)?;
         let model = Model::QLlama(QLlama::load(vb, &cache, config.clone())?);

candle-examples/examples/mistral/main.rs

@@ -244,13 +244,14 @@ fn main() -> Result<()> {
 
     let start = std::time::Instant::now();
     let config = Config::config_7b_v0_1(args.use_flash_attn);
+    let device = candle_examples::device(args.cpu)?;
     let (model, device) = if args.quantized {
         let filename = &filenames[0];
-        let vb = candle_transformers::quantized_var_builder::VarBuilder::from_gguf(filename)?;
+        let vb =
+            candle_transformers::quantized_var_builder::VarBuilder::from_gguf(filename, &device)?;
         let model = QMistral::new(&config, vb)?;
         (Model::Quantized(model), Device::Cpu)
     } else {
-        let device = candle_examples::device(args.cpu)?;
         let dtype = if device.is_cuda() {
             DType::BF16
         } else {

candle-examples/examples/phi/main.rs

@@ -299,21 +299,26 @@ fn main() -> Result<()> {
         WhichModel::PuffinPhiV2 => Config::puffin_phi_v2(),
         WhichModel::PhiHermes => Config::phi_hermes_1_3b(),
     };
-    let (model, device) = if args.quantized {
-        let vb = candle_transformers::quantized_var_builder::VarBuilder::from_gguf(&filenames[0])?;
+    let device = candle_examples::device(args.cpu)?;
+    let model = if args.quantized {
+        let vb = candle_transformers::quantized_var_builder::VarBuilder::from_gguf(
+            &filenames[0],
+            &device,
+        )?;
+        println!("Loaded vb");
         let model = match args.model {
             WhichModel::V2 => QMixFormer::new_v2(&config, vb)?,
             _ => QMixFormer::new(&config, vb)?,
         };
-        (Model::Quantized(model), Device::Cpu)
+        println!("Loaded model");
+        Model::Quantized(model)
     } else {
-        let device = candle_examples::device(args.cpu)?;
         let vb = unsafe { VarBuilder::from_mmaped_safetensors(&filenames, DType::F32, &device)? };
         let model = match args.model {
             WhichModel::V2 => MixFormer::new_v2(&config, vb)?,
             _ => MixFormer::new(&config, vb)?,
         };
-        (Model::MixFormer(model), device)
+        Model::MixFormer(model)
     };
     println!("loaded the model in {:?}", start.elapsed());
 

candle-examples/examples/quantized-t5/main.rs

@@ -132,7 +132,8 @@ impl T5ModelBuilder {
     }
 
     pub fn build_model(&self) -> Result<t5::T5ForConditionalGeneration> {
-        let vb = t5::VarBuilder::from_gguf(&self.weights_filename)?;
+        let device = Device::Cpu;
+        let vb = t5::VarBuilder::from_gguf(&self.weights_filename, &device)?;
         Ok(t5::T5ForConditionalGeneration::load(vb, &self.config)?)
     }
 

candle-examples/examples/quantized/main.rs

@@ -9,7 +9,7 @@ use std::io::Write;
 use tokenizers::Tokenizer;
 
 use candle::quantized::{ggml_file, gguf_file};
-use candle::{Device, Tensor};
+use candle::Tensor;
 use candle_transformers::generation::LogitsProcessor;
 
 use candle_examples::token_output_stream::TokenOutputStream;
@@ -361,6 +361,7 @@ fn main() -> anyhow::Result<()> {
     let model_path = args.model()?;
     let mut file = std::fs::File::open(&model_path)?;
     let start = std::time::Instant::now();
+    let device = candle_examples::device(false)?;
 
     let mut model = match model_path.extension().and_then(|v| v.to_str()) {
         Some("gguf") => {
@@ -377,10 +378,11 @@ fn main() -> anyhow::Result<()> {
                 &format_size(total_size_in_bytes),
                 start.elapsed().as_secs_f32(),
             );
-            ModelWeights::from_gguf(model, &mut file)?
+            ModelWeights::from_gguf(model, &mut file, &device)?
         }
         Some("ggml" | "bin") | Some(_) | None => {
-            let model = ggml_file::Content::read(&mut file).map_err(|e| e.with_path(model_path))?;
+            let model = ggml_file::Content::read(&mut file, &device)
+                .map_err(|e| e.with_path(model_path))?;
             let mut total_size_in_bytes = 0;
             for (_, tensor) in model.tensors.iter() {
                 let elem_count = tensor.shape().elem_count();
@@ -486,7 +488,7 @@ fn main() -> anyhow::Result<()> {
 
         let start_prompt_processing = std::time::Instant::now();
         let mut next_token = {
-            let input = Tensor::new(prompt_tokens.as_slice(), &Device::Cpu)?.unsqueeze(0)?;
+            let input = Tensor::new(prompt_tokens.as_slice(), &device)?.unsqueeze(0)?;
             let logits = model.forward(&input, 0)?;
             let logits = logits.squeeze(0)?;
             logits_processor.sample(&logits)?
@@ -507,7 +509,7 @@ fn main() -> anyhow::Result<()> {
         let start_post_prompt = std::time::Instant::now();
         let mut sampled = 0;
         for index in 0..to_sample {
-            let input = Tensor::new(&[next_token], &Device::Cpu)?.unsqueeze(0)?;
+            let input = Tensor::new(&[next_token], &device)?.unsqueeze(0)?;
             let logits = model.forward(&input, prompt_tokens.len() + index)?;
             let logits = logits.squeeze(0)?;
             let logits = if args.repeat_penalty == 1. {

candle-examples/examples/replit-code/main.rs

@@ -236,9 +236,11 @@ fn main() -> Result<()> {
     let tokenizer = Tokenizer::from_file(tokenizer_filename).map_err(E::msg)?;
 
     let start = std::time::Instant::now();
+    let device = Device::Cpu;
     let config = Config::replit_code_v1_5_3b();
     let (model, device) = if args.quantized {
-        let vb = candle_transformers::quantized_var_builder::VarBuilder::from_gguf(&filename)?;
+        let vb =
+            candle_transformers::quantized_var_builder::VarBuilder::from_gguf(&filename, &device)?;
         let model = Model::Q(Q::new(&config, vb.pp("transformer"))?);
         (model, Device::Cpu)
     } else {

candle-examples/examples/stable-lm/main.rs

@@ -234,13 +234,14 @@ fn main() -> Result<()> {
 
     let start = std::time::Instant::now();
     let config = Config::stablelm_3b_4e1t(args.use_flash_attn);
+    let device = candle_examples::device(args.cpu)?;
     let (model, device) = if args.quantized {
         let filename = &filenames[0];
-        let vb = candle_transformers::quantized_var_builder::VarBuilder::from_gguf(filename)?;
+        let vb =
+            candle_transformers::quantized_var_builder::VarBuilder::from_gguf(filename, &device)?;
         let model = QStableLM::new(&config, vb)?;
         (Model::Quantized(model), Device::Cpu)
     } else {
-        let device = candle_examples::device(args.cpu)?;
         let dtype = if device.is_cuda() {
             DType::BF16
         } else {

candle-examples/examples/whisper/main.rs

@@ -557,8 +557,10 @@ fn main() -> Result<()> {
     println!("loaded mel: {:?}", mel.dims());
 
     let mut model = if args.quantized {
-        let vb =
-            candle_transformers::quantized_var_builder::VarBuilder::from_gguf(&weights_filename)?;
+        let vb = candle_transformers::quantized_var_builder::VarBuilder::from_gguf(
+            &weights_filename,
+            &device,
+        )?;
         Model::Quantized(m::quantized_model::Whisper::load(&vb, config)?)
     } else {
         let vb =