Alexander Held

Differentiating through an ak.mean

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### Version of Awkward Array main branch ### Description and code to reproduce This is a follow-up to #2591 with a slightly more simplified setup. It should be conceptually possible...

awkward equivalent of np.isin

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### Description of new feature This came up in a `coffea` users meeting in the context of identifying particles with specific PDG ids. For generic identification, one may want to...

`uproot.dask` behavior for partially readable files

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The current behavior of `uproot.open` and `uproot.dask` differs when dealing with files that are partially unreadable by `uproot`. In my concrete example, I am dealing with ATLAS PHYSLITE files. The...

Writing a histogram with sumw2 information to a file in the getting started page

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Based on an interaction I just had with a user: the [getting started: writing objects to a file](https://uproot.readthedocs.io/en/latest/basic.html#writing-objects-to-a-file) page does include various examples of how to write histograms to a...

Forced measurement object schema validation through `ws.model()`

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I am unsure if this is a bug / feature / something else: as far as I can see, a `ws.model(validate=False)` call will trigger `get_measurement()` https://github.com/scikit-hep/pyhf/blob/adddb0797c564a0158a8e2e69a58ee1f98604bf7/src/pyhf/workspace.py#L428-L431 and subsequently that one...

Pruning bins per channel

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# Description It would be great to have a pruning utility to remove distinct bins, instead of just being able to remove full channels. Removing channels is generally useful for...

### Summary Type information that includes tensor shapes could be a powerful way of extended validation (including runtime via `typeguard` / `beartype`). The https://github.com/google/jaxtyping project looks rather promising for this....

Shapesys modifier correlated between samples

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### Summary Is there a meaningful way to correlate shapesys modifiers across samples? If not, models where this is done should be flagged as invalid. This is somewhat related to...

Possible backend refactor using keras_core / Keras 3.0

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### Summary Keras Core (https://keras.io/keras_core/announcement/) looks like it might provide a convenient unified way to access the relevant tensor operations for TensorFlow, PyTorch and JAX via a single interface. This...

### Summary I somewhat frequently run into workspaces with 100% normalization systematics, which result in NaN yields and likelihoods in `pyhf`. They have modifiers that look like the following: ```json...