翻译成中文：BIFPN stands for "Bi-directional Feature Pyramid Network", which is a neural network architecture used for object detection in computer vision. BIFPN was introduced in a paper titled "BiFPN: Efficient Multi-scale Fusion with Repeated Pyramidal Structures" by Tan et al. in 2019. BIFPN is a type of Feature Pyramid Network (FPN) that aims to improve the performance of object detection models by incorporating multi-scale features. BIFPN achieves this by using a repeated pyramidal structure that combines low-level and high-level features through a bidirectional pathway. In BIFPN, the input features are passed through a series of bi-directional nodes that perform top-down and bottom-up feature fusion, resulting in a set of multi-scale features that are robust to variations in object size and scale. The repeated structure of BIFPN helps to ensure that features at all scales are appropriately integrated, while the bidirectional connections help to propagate information between the high-level and low-level features. BIFPN has been shown to be effective in improving the accuracy of object detection models, while also being computationally efficient. As a result, BIFPN has become a popular choice for many state-of-the-art object detection architectures.

BIFPN的全称是“双向特征金字塔网络”，是一种用于计算机视觉中物体检测的神经网络架构，2019年Tan等人发表的论文《BIFPN：带有重复的金字塔结构的高效多尺度融合》中首次提出。BIFPN是一种特征金字塔网络（FPN），旨在通过结合多尺度特征来提高物体检测模型的性能。BIFPN通过使用一个重复的金字塔结构，通过双向通道将低层特征和高层特征融合在一起，从而实现。在BIFPN中，输入特征通过一系列双向节点进行自上而下和自下而上的特征融合，得到一组对物体大小和尺度变化具有鲁棒性的多尺度特征。BIFPN的重复结构有助于确保所有尺度的特征得到适当的集成，而双向连接有助于在高层特征和低层特征之间传播信息。BIFPN已被证明可以有效提高物体检测模型的准确性，同时具有计算效率。因此，BIFPN已成为许多最先进的物体检测架构的首选。

相关问题

has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. chun

CORS stands for Cross-Origin Resource Sharing, and it is a security mechanism implemented by web browsers to protect users from malicious scripts. When a web page makes a request to a different domain, the browser checks if the server includes the 'Access-Control-Allow-Origin' header in its response. If the header is not present or does not match the origin of the requesting page, the browser blocks the request.

The error message you mentioned, "has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource," indicates that the server you are making a request to does not allow cross-origin requests from your domain. This can happen if the server is not configured properly or intentionally restricts access.

To fix this issue, you have a few options:

1. Modify the server's response headers: If you have control over the server, you can add the 'Access-Control-Allow-Origin' header to the response. This header should include the domain from which you are making the request or use "*" to allow requests from any domain. Here is an example of how to set this header in a server response:

   Access-Control-Allow-Origin: https://your-domain.com

2. Use a proxy server: If you do not have control over the server's configuration or cannot modify it, you can set up a proxy server that acts as an intermediary between your web page and the target server. The proxy server can make the request on behalf of your page, and since the request will be from the same origin as your page, it will not be blocked by CORS restrictions.

3. Utilize JSONP or CORS workaround techniques: JSONP (JSON with Padding) is an older technique that allows cross-origin requests by loading scripts instead of making XMLHttpRequests. However, it has some limitations and potential security risks. Alternatively, some servers may provide specific workarounds or APIs that bypass CORS restrictions. You can check the server's documentation or contact the server owner to see if there are any alternative methods available for making cross-origin requests.

Remember, the specific solution will depend on your server's configuration and the requirements of your application.

10.1. What is IoC? Describe the implementation of IoC using pseudo-Code. 10.4. Describe the DIP in your own words. What might happen if a designer depends too heavily on concretions?

Sure, I'd be happy to answer your questions!

10.1. IoC stands for Inversion of Control, which is a design pattern used in software engineering. It is used to decouple the components of a system by allowing dependencies to be injected from outside the component rather than being created inside the component. This makes the system more flexible and easier to maintain.

Here's an example of implementing IoC using pseudo-code:

class ComponentA {
  private ComponentB dependency;
  
  public ComponentA(ComponentB dependency) {
    this.dependency = dependency;
  }
  
  public void doSomething() {
    dependency.doSomethingElse();
  }
}

class ComponentB {
  public void doSomethingElse() {
    // do something else
  }
}

// Usage:
ComponentB dependency = new ComponentB();
ComponentA componentA = new ComponentA(dependency);
componentA.doSomething();

In this example, `ComponentA` has a dependency on `ComponentB`, but rather than creating an instance of `ComponentB` inside `ComponentA`, the dependency is passed in as a constructor parameter. This allows the dependency to be easily replaced with a different implementation if needed, without having to modify `ComponentA`.

10.4. DIP stands for Dependency Inversion Principle, which is another design principle used in software engineering. It states that high-level modules should not depend on low-level modules, but both should depend on abstractions. This allows for more flexibility and easier maintenance, as changes to low-level modules won't affect the high-level modules.

If a designer depends too heavily on concretions (specific implementations), it can make the system difficult to change and maintain. For example, if a high-level module directly depends on a low-level module, it can be difficult to change the implementation of the low-level module without affecting the high-level module. This can lead to a lot of code changes and potential bugs. By depending on abstractions instead, the system becomes more flexible and easier to maintain.