# Dynamic choices for binary long-range coreference

**URL:** <https://support.prodi.gy/t/dynamic-choices-for-binary-long-range-coreference/5087>\
**Category:** Uncategorized\
**Tags:** usage, custom, coref\
**Created:** [December 14, 2021, 11:12am UTC](https://support.prodi.gy/t/dynamic-choices-for-binary-long-range-coreference/5087 "2021-12-14T11:12:54Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![ines](https://sea2.discourse-cdn.com/flex020/user_avatar/support.prodi.gy/ines/32/3_2.png) [@ines](https://support.prodi.gy/u/ines)\
**Post date:** [December 20, 2021, 10:48am UTC](https://support.prodi.gy/t/dynamic-choices-for-binary-long-range-coreference/5087/2 "2021-12-20T10:48:06Z")

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Hi! This is an interesting use case and your idea of clustering the mentions together sounds like a good approach. It's also something we've found very promising for other tasks like NER – a nice side-effect is that it also lets you take advantage of word distributions (see Zipf's law etc.). Mentions of the main character for instance are likely going to be very common, so you'll only need very few grouped decisions to cover the majority of all coref clusters.

I really like the idea of the binary "is this coreferent with X?" workflow. You could probably implement this by having the stream loop over your data and collect the mentions, and then updating a global/nonlocal variable in the recipe in the `update` callback that receives batches of answers. If the answer is `"accept"`, you'll know that you've assigned a cluster. Because the `stream` is a generator and only consumed in batches, it can respond to and change based on outside state (which is also how annotation with a model in the loop works).

For the multiple choice annotation flow, you could probably solve this with a [custom recipe](https://prodi.gy/docs/custom-recipes) and the [`choice` UI](https://prodi.gy/docs/api-interfaces#choice), or maybe even a [custom interface](https://prodi.gy/docs/custom-interfaces) with two blocks, `relations`and `choice`. In the recipe, you'd then load in your pre-segmented text and pre-populate the `"options"` with some of the most common options (maybe you want to pre-annotate a small sample here). In the `update` callback of the recipe, you can then access the created annotations, and use this to update a global/nonlocal variable of the options, that's then used in the stream.

```python
options = [...]

def get_stream(stream):
    for eg in stream:
        eg["options"] = options
        yield eg

def update(answers):
    nonlocal options
    # update options from answers

```

One thing to keep in mind in mind when updating the stream dynamically is that you'll typically have 1-2 examples "travelling" while the next examples is already queued up, so even with a batch size of 12, it may take another example for the options to be updated. I've explained this in more detail in [this thread](https://support.prodi.gy/t/prodigy-custom-model-model-in-the-loop-matcher/4534/2) on using a matcher in the loop:

> [@Prodigy Custom Model; Model in the Loop (matcher)](https://support.prodi.gy/t/prodigy-custom-model-model-in-the-loop-matcher/4534/2):
>
> One thing to keep in mind is that Prodigy will typically queue up examples in the background as you annotate, so you don't have to wait between annotations. So even with a batch size 1, example 2 will already be requested from the stream while you annotate example 1, and so on. Prodigy will also keep one batch in the app so you can easily go back and undo, without ending up with multiple conflicting versions on the back-end if you made a mistake during annotation. So there'll always be a small delay of `2 * batch_size` before the examples you've annotated hit your `update` callback.
> 
> IMO, this is an okay trade-off for the solution you want to implement, because you'll likely have an uneven distribution of entities anyway and the same span won't be present in _every_ example. So it may happen that you annotate "car" in example 1, see example 2 with "car" that wasn't pre-labeled, keep annotating and then see "car" pre-labeled in example 4 and any future examples.

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