# Machine Learning in Elixir: Stream.chunk\_every misses :discard (Page 176/177 )

**URL:** <https://forum.devtalk.com/t/machine-learning-in-elixir-stream-chunk-every-misses-discard-page-176-177/137068>\
**Category:** PragProg Customers\
**Tags:** book-machine-learning-in-elixir, errata\
**Created:** [22 December 2023 14:29 UTC](https://forum.devtalk.com/t/machine-learning-in-elixir-stream-chunk-every-misses-discard-page-176-177/137068 "2023-12-22T14:29:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![simple](https://forum.devtalk.com/user_avatar/forum.devtalk.com/simple/32/5636_2.png) [@simple](https://forum.devtalk.com/u/simple)\
**Post date:** [22 December 2023 14:29 UTC](https://forum.devtalk.com/t/machine-learning-in-elixir-stream-chunk-every-misses-discard-page-176-177/137068/1 "2023-12-22T14:29:02Z")

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The batch chunking in the CatsAndDogs module in Chapter 8 misses :discard

Should be in two places:

```auto
|> Stream.chunk_every(batch_size, batch_size, :discard)

```

but is ` |> Stream.chunk_every(batch_size)`

---

<div class="post-metadata">

**Author:** ![seanmor5](https://forum.devtalk.com/user_avatar/forum.devtalk.com/seanmor5/32/1169_2.png) [@seanmor5](https://forum.devtalk.com/u/seanmor5)\
**Post date:** [21 February 2024 19:06 UTC](https://forum.devtalk.com/t/machine-learning-in-elixir-stream-chunk-every-misses-discard-page-176-177/137068/2 "2024-02-21T19:06:41Z")

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Good catch!