use numpy variable instead of tensor in chunk_image_jacobian

[ConnorStoneAstro]

Try to Close #149 by identifying where tensor/numpy are mixed causing error when tensors are on a cuda device

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (e816201) 79.15% compared to head (32d1f61) 79.15%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #150 +/- ## ======================================= Coverage 79.15% 79.15% ======================================= Files 86 86 Lines 7186 7187 +1 ======================================= + Hits 5688 5689 +1 Misses 1498 1498 ```

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