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Two ways to put numpy in MessagePack, and only one of them unpickles

MessagePack has no code-execution feature of its own. It stores maps, arrays, strings, numbers and raw bytes. Model weights still end up in it two different ways, and the two load very differently. Flax: data in, data out Flax and JAX checkpoints written by flax.serialization.to_bytes store each ar…

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  1. 2026-10-30 07:18 · DEV Community — Machine Learning
    Two ways to put numpy in MessagePack, and only one of them unpickles

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