[TVM Discuss] [Questions] Question about touched memory as a feature for ML cost model

[Sergio via TVM Discuss]

I have been studying the features extracted from the low-level AST in the paper:

"Learning to Optimize Tensor Programs"

https://arxiv.org/abs/1805.08166

I came across the example below, 

![image|469x162](upload://1Nwo3tRquN16jTKyfcot5zSU0s5.png) 

but I am having trouble understanding the numbers   | x | 8 |  8 | 64 |. Since 
I do not see "x" indexing "A". The same applies to | y | 64 | 64 | 64 |, since 
I do not see "y" indexing matrix "B"

I would really appreciate it if someone could explain this to me in more 
detail, and in general, the concept of touched memory





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