if isinstance(weights, list) else [weights]
时间: 2024-06-02 20:13:39 浏览: 9
This line of code is a conditional expression that checks if the variable `weights` is a list. If it is a list, then it returns the list `weights`. If it is not a list, then it creates a new list with a single element `weights` and returns that list.
In other words, it ensures that the variable `weights` is always a list, either by converting it to a list if it is not already a list, or by leaving it unchanged if it is already a list. This can be useful in situations where a function expects a list as input, but the input can be either a single value or a list of values.
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for w in weights if isinstance(weights, list) else [weights]:
This line of code checks if the variable "weights" is a list. If it is a list, then it iterates over each element in the list using a for loop. If it is not a list, then it creates a new list with the single element "weights" and iterates over that single element.
The syntax for this line of code is a conditional expression. It has the format:
value_if_true if condition else value_if_false
In this case, the condition is "isinstance(weights, list)", which checks if "weights" is an instance of the class "list". If the condition is true, then the value_if_true statement is executed, which is the for loop that iterates over each element in the list. If the condition is false, then the value_if_false statement is executed, which creates a new list with the single element "weights" and iterates over that single element.
model = attempt_load(weights if isinstance(weights, list) else w, device=device, inplace=True, fuse=fuse)
这段代码的作用是尝试加载模型的权重。如果权重是一个列表,则加载所有权重。如果权重是一个路径,则只加载该路径的权重。同时,可以通过设置 `inplace=True` 来在加载权重后原地修改模型。另外,通过设置 `fuse=True` 可以启用模型融合,从而提高模型的推理速度。最后,`device` 参数指定模型在哪个设备上运行。