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| import os | |
| import sys | |
| import gc | |
| import torch | |
| from transformers import LlamaForCausalLM, LlamaTokenizer | |
| from peft import PeftModel | |
| from .globals import Global | |
| def get_device(): | |
| if torch.cuda.is_available(): | |
| return "cuda" | |
| else: | |
| return "cpu" | |
| try: | |
| if torch.backends.mps.is_available(): | |
| return "mps" | |
| except: # noqa: E722 | |
| pass | |
| def get_new_base_model(base_model_name): | |
| if Global.ui_dev_mode: | |
| return | |
| device = get_device() | |
| if device == "cuda": | |
| model = LlamaForCausalLM.from_pretrained( | |
| base_model_name, | |
| load_in_8bit=Global.load_8bit, | |
| torch_dtype=torch.float16, | |
| # device_map="auto", | |
| device_map={'': 0}, # ? https://github.com/tloen/alpaca-lora/issues/21 | |
| ) | |
| elif device == "mps": | |
| model = LlamaForCausalLM.from_pretrained( | |
| base_model_name, | |
| device_map={"": device}, | |
| torch_dtype=torch.float16, | |
| ) | |
| else: | |
| model = LlamaForCausalLM.from_pretrained( | |
| base_model_name, device_map={"": device}, low_cpu_mem_usage=True | |
| ) | |
| model.config.pad_token_id = get_tokenizer(base_model_name).pad_token_id = 0 | |
| model.config.bos_token_id = 1 | |
| model.config.eos_token_id = 2 | |
| return model | |
| def get_tokenizer(base_model_name): | |
| if Global.ui_dev_mode: | |
| return | |
| loaded_tokenizer = Global.loaded_tokenizers.get(base_model_name) | |
| if loaded_tokenizer: | |
| return loaded_tokenizer | |
| tokenizer = LlamaTokenizer.from_pretrained(base_model_name) | |
| Global.loaded_tokenizers.set(base_model_name, tokenizer) | |
| return tokenizer | |
| def get_model( | |
| base_model_name, | |
| peft_model_name = None): | |
| if Global.ui_dev_mode: | |
| return | |
| if peft_model_name == "None": | |
| peft_model_name = None | |
| model_key = base_model_name | |
| if peft_model_name: | |
| model_key = f"{base_model_name}//{peft_model_name}" | |
| loaded_model = Global.loaded_models.get(model_key) | |
| if loaded_model: | |
| return loaded_model | |
| peft_model_name_or_path = peft_model_name | |
| lora_models_directory_path = os.path.join(Global.data_dir, "lora_models") | |
| possible_lora_model_path = os.path.join(lora_models_directory_path, peft_model_name) | |
| if os.path.isdir(possible_lora_model_path): | |
| peft_model_name_or_path = possible_lora_model_path | |
| Global.loaded_models.prepare_to_set() | |
| clear_cache() | |
| model = get_new_base_model(base_model_name) | |
| if peft_model_name: | |
| device = get_device() | |
| if device == "cuda": | |
| model = PeftModel.from_pretrained( | |
| model, | |
| peft_model_name_or_path, | |
| torch_dtype=torch.float16, | |
| device_map={'': 0}, # ? https://github.com/tloen/alpaca-lora/issues/21 | |
| ) | |
| elif device == "mps": | |
| model = PeftModel.from_pretrained( | |
| model, | |
| peft_model_name_or_path, | |
| device_map={"": device}, | |
| torch_dtype=torch.float16, | |
| ) | |
| else: | |
| model = PeftModel.from_pretrained( | |
| model, | |
| peft_model_name_or_path, | |
| device_map={"": device}, | |
| ) | |
| model.config.pad_token_id = get_tokenizer(base_model_name).pad_token_id = 0 | |
| model.config.bos_token_id = 1 | |
| model.config.eos_token_id = 2 | |
| if not Global.load_8bit: | |
| model.half() # seems to fix bugs for some users. | |
| model.eval() | |
| if torch.__version__ >= "2" and sys.platform != "win32": | |
| model = torch.compile(model) | |
| Global.loaded_models.set(model_key, model) | |
| clear_cache() | |
| return model | |
| def clear_cache(): | |
| gc.collect() | |
| # if not shared.args.cpu: # will not be running on CPUs anyway | |
| with torch.no_grad(): | |
| torch.cuda.empty_cache() | |
| def unload_models(): | |
| Global.loaded_models.clear() | |
| Global.loaded_tokenizers.clear() | |
| clear_cache() | |