For aesthetic or functional reasons?  If aesthetics, the following is equivalent to the for loop implementation above:
tens_list = [(x, y) for x in range(10) for y in range(100)]

If functional, I’m not sure what the fastest method would be.  I’d guess that creating a “template” object with something like the above and then generating a new tensor from it as needed elsewhere in your code would be a contender for “fastest”.  Unfortunately, I’m pretty new at all this stuff, so I could be way off…