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Traceback (most recent call last): File "E:\python3.120\Lib\site-packages\IPython\core\interactiveshell.py", line 3526, in run_code exec(code_obj, self.user_global_ns, self.user_ns) File "<ipython-input-3-d8bd7e072582>", line 36, in <module> trainer = torch.optim.SGD(net.parameters(), lr=0.03) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "E:\python3.120\Lib\site-packages\torch\optim\sgd.py", line 63, in __init__ super().__init__(params, defaults) File "E:\python3.120\Lib\site-packages\torch\optim\optimizer.py", line 369, in __init__ self.add_param_group(cast(dict, param_group)) File "E:\python3.120\Lib\site-packages\torch\_compile.py", line 46, in inner import torch._dynamo File "E:\pycharm\PyCharm Community Edition 2023.2.2\plugins\python-ce\helpers\pydev\_pydev_bundle\pydev_import_hook.py", line 21, in do_import module = self._system_import(name, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "E:\python3.120\Lib\site-packages\torch\_dynamo\__init__.py", line 53, in <module> from .polyfills import loader as _ # usort: skip # noqa: F401 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "E:\pycharm\PyCharm Community Edition 2023.2.2\plugins\python-ce\helpers\pydev\_pydev_bundle\pydev_import_hook.py", line 21, in do_import module = self._system_import(name, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "E:\python3.120\Lib\site-packages\torch\_dynamo\polyfills\loader.py", line 25, in <module> POLYFILLED_MODULES: tuple["ModuleType", ...] = tuple( ^^^^^^ File "E:\python3.120\Lib\site-packages\torch\_dynamo\polyfills\loader.py", line 26, in <genexpr> importlib.import_module(f".{submodule}", package=polyfills.__name__) File "E:\python3.120\Lib\importlib\__init__.py", line 90, in import_module return _bootstrap._gcd_import(name[level:], package, level) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "E:\python3.120\Lib\site-packages\torch\_dynamo\polyfills\functools.py", line 24, in <module> @substitute_in_graph(functools.reduce) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "E:\python3.120\Lib\site-packages\torch\_dynamo\decorators.py", line 404, in wrapper raise TypeError( TypeError: Signature mismatch between <function reduce at 0x0000000001190EA0> and <function reduce at 0x00000000322684A0>: (function, sequence, initial=<object object at 0x0000000000ED8550>) != (function: Callable[[~_U, ~_T], ~_U], iterable: collections.abc.Iterable[~_T], initial: ~_U = <class 'torch._dynamo.polyfills.functools._INITIAL_MISSING'>, /) -> ~_U

时间: 2025-05-28 17:45:26 浏览: 33
### 解决 PyTorch 中 SGD Optimizer 的 TypeError 问题 在使用 PyTorch 的随机梯度下降 (Stochastic Gradient Descent, SGD) 优化器时,可能会遇到 `TypeError` 错误,提示签名不匹配或减少函数错误。这种问题通常是由于以下几个原因之一引起的: #### 原因分析 1. **参数列表中的张量不可微分**:如果传递给优化器的模型参数中包含了无法计算梯度的部分(即 `.requires_grad=False` 或者根本不是叶子节点),则会引发此类型的错误[^1]。 2. **自定义损失函数实现不当**:当用户尝试创建自己的损失函数而未遵循标准接口约定时也可能触发类似的异常情况。例如,在反向传播过程中调用了不适合的操作符或者方法[^2]。 3. **版本兼容性问题**:不同的 PyTorch 版本之间可能存在 API 变更,这可能导致旧代码在新环境中运行失败。因此,请确保所使用的 PyTorch 是稳定的,并且与教程或其他资源保持一致[^3]。 #### 示例修复方案 下面提供了一段修正后的代码示例,展示了如何正确初始化和应用 SGD 优化器以避免上述提到的各种潜在陷阱: ```python import torch from torch import nn, optim # 定义简单的线性回归模型 model = nn.Linear(1, 1) # 设置所有可学习权重允许求导数 for param in model.parameters(): param.requires_grad_(True) # 构造 MSE Loss 函数实例 loss_fn = nn.MSELoss() # 初始化 Adam 优化算法对象 optimizer = optim.SGD(model.parameters(), lr=0.01) def train_step(input_data, target_output): # 零化之前的累积梯度值 optimizer.zero_grad() # 正向传播过程得到预测结果 predictions = model(input_data) # 计算误差程度作为反馈信号 loss_value = loss_fn(predictions, target_output) # 向后传导更新网络内部状态 loss_value.backward() # 执行一步参数调整操作 optimizer.step() ``` #### 进一步排查建议 - 检查输入数据形状是否符合预期; - 确认目标标签的数据类型同实际输出相匹配; - 对于复杂架构来说,逐层打印中间变量有助于定位具体哪一部分出了差错; ---
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130, in __exit__ self.gen.throw(type, value, traceback) File "d:\python37\lib\site-packages\setuptools\sandbox.py", line 195, in setup_context yield File "d:\python37\lib\contextlib.py", line 130, in __exit__ self.gen.throw(type, value, traceback) File "d:\python37\lib\site-packages\setuptools\sandbox.py", line 166, in save_modules saved_exc.resume() File "d:\python37\lib\site-packages\setuptools\sandbox.py", line 141, in resume six.reraise(type, exc, self._tb) File "d:\python37\lib\site-packages\setuptools\_vendor\six.py", line 685, in reraise raise value.with_traceback(tb) File "d:\python37\lib\site-packages\setuptools\sandbox.py", line 154, in save_modules yield saved File "d:\python37\lib\site-packages\setuptools\sandbox.py", line 195, in setup_context yield File "d:\python37\lib\site-packages\setuptools\sandbox.py", line 250, in run_setup _execfile(setup_script, ns) File "d:\python37\lib\site-packages\setuptools\sandbox.py", line 44, in _execfile code = compile(script, filename, 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