[QST]How to understand composition?

[SuperCB]

What is your question? I am confused about the content of this article. Link when to mod ?when to div?

and what's the meaning of dth?

[cloudhan]

Mathematically, a Layout is a fucntion mapping from integer to integer (1d logical index to 1d logical index). A Layout is a tuple of Shape and Stride. The Shape is in responsible for "unflatting" the 1d logical index into a n-d logical coordinate (div and mod). And the Stride is in responsible for inner product with n-d logical coordinate to get back to the 1d logical index.

Since the a Layout is a fucntion mapping from integer to integer, they can easily compose. For example, Layout A and B. A(B(i)), B(i) always returns an integer, so the function A can take it as input, aka, function compose.

For mod and div with Layouts, I don't think they are significant to the user.

[SuperCB]

you don't answer my question

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