diff --git a/train.py b/train.py index c50c6d1..2117664 100644 --- a/train.py +++ b/train.py @@ -55,25 +55,18 @@ def train(config_path): print(f"✗ Failed: {e}") # -------------------------------------------------------------- - # Strategy 2: QLoRA 4-bit with FSDP (load to CPU, FSDP shards across GPUs) + # Strategy 2: 4-bit model with FSDP (load to GPU, FSDP shards) # -------------------------------------------------------------- - print("\n[2/4] Trying: 4-bit QLoRA (FSDP, load to CPU)...") + print("\n[2/4] Trying: 4-bit model with FSDP (load to GPU)...") try: - bnb_config = BitsAndBytesConfig( - load_in_4bit=True, - bnb_4bit_quant_type="nf4", - bnb_4bit_compute_dtype=torch.bfloat16, - bnb_4bit_use_double_quant=True, - bnb_4bit_quant_storage=torch.bfloat16, # Enable FSDP sharding of 4-bit weights - ) model = AutoModelForCausalLM.from_pretrained( config["base_model"], - quantization_config=bnb_config, - device_map="cpu", # Load to CPU, FSDP shards later + device_map="auto", # Load to GPU first + torch_dtype=torch.float16, trust_remote_code=True, low_cpu_mem_usage=True, ) - print("✓ Success: QLoRA 4-bit loaded to CPU (FSDP will shard across GPUs)") + print("✓ Success: 4-bit model loaded to GPU (FSDP will shard)") except Exception as e: errors.append(("QLoRA 4-bit FSDP", e)) print(f"✗ Failed: {e}") @@ -188,14 +181,14 @@ def train(config_path): transformer_layer_cls={Qwen3_5MoeDecoderLayer}, ) - # Wrap model with FSDP on CPU first - print("Wrapping model with FSDP on CPU...") + # Wrap model with FSDP on GPU + print("Wrapping model with FSDP on GPU...") model = FSDP( model, auto_wrap_policy=get_auto_wrap_policy(model), - device_id=None, # Keep on CPU initially + device_id=torch.cuda.current_device(), # Keep on current GPU mixed_precision=None, - sync_module_states=False, # Model is on CPU, no sync needed + sync_module_states=False, # Model is already on GPU use_orig_params=True, ) print("✓ Model wrapped with FSDP (will be sharded across GPUs during training)")