self.present的使用
时间: 2024-09-20 19:16:43 浏览: 64
`self.present`是iOS和macOS开发中常用的一个方法,主要用于通过代码动态地展示或呈现一个UIViewController对象。这个方法通常在导航控制器(UINavigationController)中使用,比如从当前ViewController展示一个新的ViewController作为模态视图(Modal View)或者作为底部弹出视图(Popover View)。
例如,在单击按钮时展示一个新的ViewController:
```swift
@IBAction func showDetailVC(_ sender: UIButton) {
let detailVC = DetailViewController() // 创建新的详情ViewController实例
detailVC.modalPresentationStyle = .fullScreen // 设置模态显示风格全屏
present(detailVC, animated: true, completion: nil) // 动态呈现视图
}
```
这里的`present(_:animated:completion:)`方法接收三个参数:
- 要呈现的UIViewController实例
- 是否需要动画过渡
- 结束动画后的闭包(可选)
相关问题
if self.n_future > 0: present_state = states[:, :1].contiguous() if self.cfg.PROBABILISTIC.ENABLED: # Do probabilistic computation sample, output_distribution = self.distribution_forward( present_state, future_distribution_inputs, noise ) output = {**output, **output_distribution} # Prepare future prediction input b, _, _, h, w = present_state.shape hidden_state = present_state[:, 0] if self.cfg.PROBABILISTIC.ENABLED: future_prediction_input = sample.expand(-1, self.n_future, -1, -1, -1) else: future_prediction_input = hidden_state.new_zeros(b, self.n_future, self.latent_dim, h, w) # Recursively predict future states future_states = self.future_prediction(future_prediction_input, hidden_state) # Concatenate present state future_states = torch.cat([present_state, future_states], dim=1)这段代码得到什么?
这段代码的作用是进行未来状态的预测,输出一个字典 `output`,其中包含模型的预测结果。具体来说,这段代码做了以下几件事情:
1. 从输入的 `states` 中取出当前时刻的状态 `present_state`,即第一个时间步的状态。
2. 如果在模型的配置中启用了概率计算(`self.cfg.PROBABILISTIC.ENABLED` 为 True),则进行概率计算,并得到预测结果的采样值 `sample` 和输出分布 `output_distribution`。
3. 根据当前状态,准备好未来预测的输入数据 `future_prediction_input`,其形状为 `(batch_size, n_future, latent_dim, height, width)`,其中 `batch_size` 为批大小,`n_future` 为未来状态的时间步数,`latent_dim` 为隐藏状态的维度,`height` 和 `width` 分别为输入数据的高度和宽度。
4. 使用 `future_prediction` 函数递归地进行未来状态预测,其中 `future_prediction_input` 为输入数据,`hidden_state` 为隐藏状态,输出为 `future_states`,其形状为 `(batch_size, n_future, latent_dim, height, width)`。
5. 将当前状态 `present_state` 和预测的未来状态 `future_states` 进行拼接,得到完整的预测结果 `future_states`,其形状为 `(batch_size, n_future+1, latent_dim, height, width)`。
6. 将预测结果 `future_states` 加入到输出字典 `output` 中,返回该字典。
label_name = os.path.join(self.args.label_save_path + self.args.weight_path.split('run/')[1], IndexError: list index out of range
This error indicates that the program is encountering an IndexError while trying to split the string "weight_path" using the delimiter "run/". This means that the string "weight_path" does not contain the delimiter "run/" and therefore cannot be split into a list.
To resolve this error, you can check the value of "weight_path" and make sure that it contains the expected delimiter. You can also try using a different delimiter or modify the code to handle cases where the delimiter is not present.
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