torch.jit.load和torch.load
时间: 2024-10-18 18:19:15 浏览: 110
`torch.jit.load` 和 `torch.load` 是PyTorch库中的两个用于加载训练好的模型的功能,但它们之间存在一些差异。
`torch.load()` 可以加载保存的PyTorch模型状态(包括参数、优化器状态等),通常适用于非图模式(non-graph mode)下的模型。当你直接传递一个文件路径时,它期望的是一个.pth文件,这是标准的PyTorch模型保存格式。
然而,`torch.jit.load()` 是用来加载 TorchScript(一种可执行的模型格式)模型的。这意味着它是针对图模式(graph mode)的,主要用于序列化已经通过 `torch.jit.script()` 或 `torch.jit.trace()` 编译过的模型。这个函数对输入路径的要求比较严格,不能直接接受文件的绝对路径,因为它期望模型文件与调用它的脚本文件在同一目录下,或者是一个相对路径。
如果你有一个TorchScript模型文件,你可以这样加载:
```python
# 假设你的模型文件名为model.pt
# 而你的脚本文件在同一个目录下
model = torch.jit.load("model.pt")
```
如果不在同一目录,你可能需要调整工作目录或者使用相对路径来解决这个问题:
```python
import os
os.chdir(os.path.dirname(__file__)) # 设置到当前脚本所在的目录
model = torch.jit.load("model.pt") # 使用相对路径
```
相关问题
torch.jit.load
`torch.jit.load` is a function in PyTorch that loads a serialized TorchScript model from a file or a file-like object. It returns a `torch.jit.ScriptModule` object, which can be used to run the model.
Syntax:
```python
torch.jit.load(filepath_or_buffer, map_location=None, **kwargs)
```
Parameters:
- `filepath_or_buffer` (str or file-like object) – The path to the serialized TorchScript model or a file-like object containing the serialized model.
- `map_location` (str or torch.device or callable, optional) – A string specifying the device where the model will be loaded, or a torch.device object representing the device, or a callable that takes a string parameter and returns a torch.device object. Default is None, which means the model will be loaded on the same device where it was originally saved.
- `**kwargs` – Additional keyword arguments that will be passed to `torch.load()` function.
Returns:
- A `torch.jit.ScriptModule` object representing the loaded model.
Example:
```python
import torch
# Load the serialized model from a file
model = torch.jit.load('model.pt')
# Load the serialized model from a file-like object
with open('model.pt', 'rb') as f:
model = torch.jit.load(f)
# Load the serialized model on a different device
device = torch.device('cpu')
model = torch.jit.load('model.pt', map_location=device)
```
torch.jit.load()
torch.jit.load()是PyTorch中的一个函数,用于加载经过torch.jit.save()保存的模型。该函数接受一个路径参数,指定保存模型的文件路径,并返回加载后的模型对象。通常在加载模型后,需要通过调用model.eval()方法将模型设置为评估模式。。
该函数的使用有三种方法,可以根据具体情况选择:
1. 使用默认的CPU设备加载模型:model = torch.jit.load(path)。
2. 在GPU上加载模型:设定特定的设备,如loc = torch.device('cuda:0'),然后使用map_location参数指定加载设备: model = torch.jit.load(path, map_location=loc***
当使用torch.load()加载模型参数时,如果出现类似"xxx.pt is a zip archive(did you mean to use torch.jit.load()?)"的错误提示,可能是因为误用了torch.load()函数,应该使用torch.jit.load()来加载模型。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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