Is there something about 是在 that is meaningful in 让任意的值是在一个上下文当中?
The article in the first link is clearly machine-translated from the original version in the second link with some partials not even translated. A lot of the sentences are difficult to understand, if they make any sense at all. 让任意的值是在一个上下文当中 is just wrong in Chinese. One proper translation might be 把任意值放到上下文当中.