unable to reduce the step size without violating 是什么错误
时间: 2023-11-22 11:51:51 浏览: 43
"Unable to reduce the step size without violating" 是一个优化算法(如梯度下降)在更新参数时的错误提示。它通常表示当前所使用的学习率过小,无法继续降低损失函数的值而不违反优化算法的一些限制条件,例如不能超出参数的取值范围或不能使梯度变得过大。为了解决这个问题,可以尝试增加学习率、减小损失函数的复杂度或使用其他优化算法。
相关问题
because it violates the following Content Security Policy directive
:"script-src 'self' 'unsafe-inline' 'unsafe-eval'"
This directive specifies that scripts can only be loaded from the website's own domain and from trusted sources that have been explicitly allowed. The "unsafe-inline" and "unsafe-eval" keywords allow inline scripts and script evaluation, but these are generally considered to be insecure and should be avoided.
The error message indicates that the script being loaded is violating this directive by attempting to load a script from an external domain or by using inline or evaluated scripts. To fix the issue, the website's Content Security Policy should be updated to explicitly allow the necessary scripts or to use more secure alternatives.
One might expect the parameter to have the type List. That way, it seems likely, you could call it with parameters of type List or List for any class E. Explain carefully what is wrong with this argument and why the type List is used instead.
The argument that the parameter should have the type `List<E>` instead of `List<? extends E>` is based on the assumption that `List<E>` can be used to represent a list of any type of object. However, this assumption is incorrect. Consider the following example:
```
List<String> strings = new ArrayList<>();
List<Object> objects = strings; // Not allowed
objects.add(1);
String s = strings.get(0); // Throws ClassCastException at runtime
```
Here, `strings` is a `List<String>` and `objects` is a `List<Object>`. If we were allowed to assign `strings` to `objects`, we could add an integer to `objects`, violating the type safety of `strings`. This is why Java does not allow such an assignment.
Now, consider a method with a parameter of type `List<E>`. The following call might seem valid:
```
List<Object> objects = new ArrayList<>();
foo(objects);
```
However, if `foo` adds an element of type `E` to the list, it would violate the type safety of `objects`. This is why Java uses a bounded wildcard `List<? extends E>` instead of `List<E>`. This ensures that the method cannot add elements to the list, only read them, and does not violate the type safety of the argument list.
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