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quantization=jax_mxfp8 / jax_mxfp4 runs the dense projections, forward and both backward GEMMs, through jax.nn.scaled_dot_general with one OCP MX config: E4M3 / E2M1 elements with an E8M0 scale per block of 32. The recipe is stateless, so checkpoints are those of the unquantized model. Configs with use_qwix_quantization=True, shard_mode=explicit or MoE models are rejected. jax_mxfp4 needs a JAX with the mxfp4 config (jax-ml/jax#41341).
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