Commits on Feb 12, 2021

1. *: add support for windowing of tensors …

   This commit adds support for windowing of tensors in the existing index
   notation DSL. For example:
   
   ```
   A(i, j) = B(i(1, 4), j) * C(i, j(5, 10))
   ```
   
   causes `B` to be windowed along its first mode, and `C` to be windowed
   along its second mode. In this commit any mix of windowed and
   non-windowed modes are supported, along with windowing the same tensor
   in different ways in the same expression. The windowing expressions
   correspond to the `:` operator to slice dimensions in `numpy`.
   
   Currently, only windowing by integers is supported.
   
   Windowing is achieved by tying windowing information to particular
   `Iterator` objects, as these are created for each `Tensor`-`IndexVar`
   pair. When iterating over an `Iterator` that may be windowed, extra
   steps are taken to either generate an index into the windowed space, or
   to recover an index from a point in the windowed space.

   

   rohany committed Feb 12, 2021
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