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Fixing a (likely) bug in MapFusion. #1673

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Fixing a (likely) bug in MapFusion. #1673

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Commits on Oct 17, 2024

  1. Fix the issue with cpp codegen, where it currently cannot handle inputs 

    like:
```c++
cpp.reshape_strides(Range([(0, 4, 1), (0, 5, 1)]), None, None, [2, 3, 5])
```
and crashes with an index error.
    @pratyai
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  2. Use integer division, fractions don't make sense here anyway.

    @pratyai
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  3. Add even more tests to cover strides and offsets.

    @pratyai
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  4. Start with cleaning up the imports.

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  5. Since edge is a loop variable, we probably don't want to use that 

    outside the loop. It seems to be a typo on `iedge`.
    @pratyai
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  6. Fix a bunch of docstrings and typehints.

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  7. Remove a couple of redundant == Trues.

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  8. Since port_created is only a pair (or None), it does not have st and 

    `nd` fields.
    @pratyai
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  9. Fix another typehint.

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  10. Fixes for various minor PEP 8 complaints (which are otherwise no-op).

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  11. Typehints and set literal in helpers.

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  12. Move various helper functions out of @staticmethod, since they don't 

    need to be tied to the class itself. Remove their unnecessary arguments.
    @pratyai
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  13. Breakout two pieces of fuse() function into their own helpers.

    @pratyai
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  14. Finally, fix the bug in subgraph fusion that was causing index error.

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  15. Forgot to update the references to subgraph fusion, fixing now 

    + Removing unnecessary imports.
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  16. Validating halfway in the fusion wasn't a good idea.

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  17. When checking for the "array usage" criteria that can prevent 

    map-fusion, check only within the current state. Otherwise, any "use" of
the array _globally_ (i.e., in the entire SDFG) will cancel the fusion.
    @pratyai
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  18. Make sure that the intermediate transient access nodes are not removed 

    if they are used elsewhere.
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