Continuing from the question above, one may introduce a step length parameter, 𝛼 , into the formula as follows: 𝑊 𝑘 = 𝑊 𝑘 − 1 + 𝛼 𝑑 𝑘 − 1 Please select all the correct answers below.多项选择题

It is necessary to normalize the direction vector d when introducing the length parameter.

We may set 𝛼 = 1 / 𝑘  at the _k-th iteration, which shortens the step length as the process progresses. Fortunately, this approach will still reach the optimum in practice, as long as the iterations continue.

Adding a length parameter may result in more iterations to reach an optimum.

When applying the diminishing step-size rule, the total distance traveled by the algorithm tends to infinity, provided the process continues indefinitely.

The length parameter should be a value between 0 and 1.

The length parameter can be any positive value.