self.policy_old_job.load_state_dict(self.policy_job.state_dict())
时间: 2023-10-22 11:10:03 浏览: 42
这行代码的作用是将 `policy_job` 的状态字典复制一份给 `policy_old_job`,实现两个模型参数的完全相同。这通常用于实现深度强化学习算法中的重要性采样。在更新策略时,我们需要使用旧的模型参数计算先前采样的动作的概率值,而使用新的模型参数计算当前采样的动作的概率值。因此,我们需要在每次更新之前保存旧的模型参数,以便在更新过程中使用。
相关问题
self.policy_old.load_state_dict(self.policy.state_dict())
This line of code in Python is used to load the state dictionary of the current policy into the old policy. This is useful in reinforcement learning algorithms where we may want to update the policy based on new experiences, but also want to keep a copy of the old policy for comparison or potential rollback.
The `load_state_dict()` function is a method of PyTorch's `nn.Module` class, which is typically used for defining and training neural networks. It takes in a dictionary of parameter names mapped to their values, and sets the module's parameters to those values. In this case, it sets the parameters of the old policy to be the same as the current policy.
Note that this line assumes that `self.policy` and `self.policy_old` are both instances of PyTorch's `nn.Module` class, and that they have the same set of parameters (i.e. the same architecture).
self.load_state_dict()
self.load_state_dict()是PyTorch中用于加载模型权重的函数。它的作用是将预训练模型的权重加载到当前的模型中。在加载之前,可以根据需要进行一些自定义处理,比如舍弃某些层或者调整参数尺度。通过调用self.load_state_dict(state_dict, strict=False),可以加载模型权重并将其应用到当前模型中。
在加载模型权重时,有时会出现参数尺度不匹配的情况,可以使用自定义加载模型的方法来解决。例如,在加载权重之前,可以通过对模型的state_dict进行处理,只选择需要的参数进行更新。然后使用self.load_state_dict(model_dict)将处理后的参数加载到当前模型中。
另外,如果在加载模型权重时出现了错误,比如参数名称不匹配,可以尝试使用strict=False参数来跳过错误,即使用model.load_state_dict(state_dict, strict=False)。这样可以避免加载失败并继续进行模型的加载和使用。
总之,self.load_state_dict()是一个用于加载模型权重的函数,可以根据需要进行自定义处理,并且可以通过strict参数来控制是否严格匹配参数名称。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *2* [pytorch加载预训练 加载部分参数](https://blog.csdn.net/jacke121/article/details/91390803)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 50%"]
- *3* [“load_state_dict self.class.name, “\n\t”.join(error_msgs))) RuntimeError: Error(s) in loading ...](https://blog.csdn.net/m0_47780393/article/details/123816525)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 50%"]
[ .reference_list ]