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WgpuModelState

entrenar::train::transformer_trainer::wgpu_trainer

Struct WgpuModelState 

Source 
pub struct WgpuModelState {
Show 14 fields
    pub layers: Vec<Nf4LayerWeights>,
    pub lora: Vec<LoraLayerSet>,
    pub lm_head: Vec<f32>,
    pub lm_head_m: Vec<f32>,
    pub lm_head_v: Vec<f32>,
    pub hidden_size: usize,
    pub num_layers: usize,
    pub vocab_size: usize,
    pub num_heads: usize,
    pub num_kv_heads: usize,
    pub head_dim: usize,
    pub intermediate_size: usize,
    pub ffn_cache: Vec<Option<(Vec<f32>, Vec<f32>, Vec<f32>)>>,
    pub attn_cache: Vec<Option<(Vec<f32>, Vec<f32>, Vec<f32>, Vec<f32>)>>,

}
Expand description

Full model state for WGPU training

Holds NF4 weights + LoRA adapters for all layers. Per-layer dequant strategy: only one layer’s fp32 weights in VRAM at a time.

Fields§

§layers: Vec<Nf4LayerWeights>

NF4 weights per layer (compact, stays in CPU RAM)

§lora: Vec<LoraLayerSet>

LoRA Q adapters per layer (trainable, fp32) LoRA adapters per layer (7 projections: Q/K/V/O/gate/up/down)

§lm_head: Vec<f32>

LM head weight [vocab_size, hidden_size] fp32

§lm_head_m: Vec<f32>

LM head optimizer state

§lm_head_v: Vec<f32>§hidden_size: usize

Config

§num_layers: usize§vocab_size: usize§num_heads: usize§num_kv_heads: usize§head_dim: usize§intermediate_size: usize§ffn_cache: Vec<Option<(Vec<f32>, Vec<f32>, Vec<f32>)>>

Cached dequanted FFN weights per layer: (gate, up, down) fp32

§attn_cache: Vec<Option<(Vec<f32>, Vec<f32>, Vec<f32>, Vec<f32>)>>

Implementations§

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impl WgpuModelState

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pub fn load_qwen3_4b( model_dir: &Path, lora_rank: u32, _lora_alpha: f32, ) -> Result<Self, String>

Load Qwen3-4B model from safetensors directory

Quantizes all weights to NF4 (stays in CPU RAM). Creates LoRA adapters for Q and V projections.

§Contract (C-WGPU-TRAIN-003)
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pub fn populate_weight_cache( &mut self, device: &GpuDevice, ) -> Result<(), String>

Populate weight caches (pre-transposed for standard matmul).

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pub fn trainable_params(&self) -> usize

Total trainable parameters

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pub fn save_checkpoint( &self, dir: &Path, step: u32, loss: f32, rank: u32, alpha: f32, ) -> Result<PathBuf, String>

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pub fn load_checkpoint(&mut self, path: &Path) -> Result<(u32, f32), String>

Load LoRA checkpoint (delegates to wgpu_checkpoint)

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