transformers 不同精度float16、bfloat16、float32加载模型对比

本文主要是介绍transformers 不同精度float16、bfloat16、float32加载模型对比，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

参考：

https://github.com/chunhuizhang/pytorch_distribute_tutorials/blob/main/tutorials/amp_autocast_mixed_precision_training.ipynb

from transformers import AutoModelForCausalLM, AutoTokenizer
device = "cuda" # the device to load the model ontomodel = AutoModelForCausalLM.from_pretrained("Qwen1.5-7B-Chat",torch_dtype="auto",device_map="auto"
)
# tokenizer = AutoTokenizer.from_pretrained("Qwen/Qwen2-7B-Instruct")
print(model.get_memory_footprint()/(1024**2))for name, para in model.named_parameters():print(para.dtype, name, para.device)

默认bfloat16

from transformers import AutoModelForCausalLM, AutoTokenizer
import torch
device = "cuda" # the device to load the model ontomodel = AutoModelForCausalLM.from_pretrained("Qwen1.5-7B-Chat",torch_dtype=torch.float16,,device_map="auto"
)
# tokenizer = AutoTokenizer.from_pretrained("Qwen/Qwen2-7B-Instruct")
print(model.get_memory_footprint()/(1024**2))for name, para in model.named_parameters():print(para.dtype, name, para.device)

float16与bfloat16加载空间需要差不多，差不多GPU需要15G多

from transformers import AutoModelForCausalLM, AutoTokenizer
import torch
device = "cuda" # the device to load the model ontomodel = AutoModelForCausalLM.from_pretrained("Qwen1.5-7B-Chat",torch_dtype=torch.float32,,device_map="auto"
)
# tokenizer = AutoTokenizer.from_pretrained("Qwen/Qwen2-7B-Instruct")
print(model.get_memory_footprint()/(1024**2))for name, para in model.named_parameters():print(para.dtype, name, para.device)

GPU需要19G多，精度会高些32bit，空间大些

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